зеркало из https://github.com/microsoft/git.git
3880 строки
122 KiB
C
3880 строки
122 KiB
C
/*
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* "Ostensibly Recursive's Twin" merge strategy, or "ort" for short. Meant
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* as a drop-in replacement for the "recursive" merge strategy, allowing one
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* to replace
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*
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* git merge [-s recursive]
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*
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* with
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*
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* git merge -s ort
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*
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* Note: git's parser allows the space between '-s' and its argument to be
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* missing. (Should I have backronymed "ham", "alsa", "kip", "nap, "alvo",
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* "cale", "peedy", or "ins" instead of "ort"?)
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*/
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#include "cache.h"
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#include "merge-ort.h"
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#include "alloc.h"
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#include "attr.h"
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#include "blob.h"
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#include "cache-tree.h"
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#include "commit.h"
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#include "commit-reach.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "dir.h"
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#include "entry.h"
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#include "ll-merge.h"
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#include "object-store.h"
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#include "revision.h"
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#include "strmap.h"
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#include "submodule.h"
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#include "tree.h"
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#include "unpack-trees.h"
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#include "xdiff-interface.h"
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/*
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* We have many arrays of size 3. Whenever we have such an array, the
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* indices refer to one of the sides of the three-way merge. This is so
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* pervasive that the constants 0, 1, and 2 are used in many places in the
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* code (especially in arithmetic operations to find the other side's index
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* or to compute a relevant mask), but sometimes these enum names are used
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* to aid code clarity.
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*
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* See also 'filemask' and 'dirmask' in struct conflict_info; the "ith side"
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* referred to there is one of these three sides.
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*/
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enum merge_side {
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MERGE_BASE = 0,
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MERGE_SIDE1 = 1,
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MERGE_SIDE2 = 2
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};
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struct traversal_callback_data {
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unsigned long mask;
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unsigned long dirmask;
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struct name_entry names[3];
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};
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struct rename_info {
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/*
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* All variables that are arrays of size 3 correspond to data tracked
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* for the sides in enum merge_side. Index 0 is almost always unused
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* because we often only need to track information for MERGE_SIDE1 and
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* MERGE_SIDE2 (MERGE_BASE can't have rename information since renames
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* are determined relative to what changed since the MERGE_BASE).
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*/
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/*
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* pairs: pairing of filenames from diffcore_rename()
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*/
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struct diff_queue_struct pairs[3];
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/*
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* dirs_removed: directories removed on a given side of history.
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*
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* The keys of dirs_removed[side] are the directories that were removed
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* on the given side of history. The value of the strintmap for each
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* directory is a value from enum dir_rename_relevance.
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*/
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struct strintmap dirs_removed[3];
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/*
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* dir_rename_count: tracking where parts of a directory were renamed to
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*
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* When files in a directory are renamed, they may not all go to the
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* same location. Each strmap here tracks:
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* old_dir => {new_dir => int}
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* That is, dir_rename_count[side] is a strmap to a strintmap.
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*/
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struct strmap dir_rename_count[3];
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/*
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* dir_renames: computed directory renames
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*
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* This is a map of old_dir => new_dir and is derived in part from
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* dir_rename_count.
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*/
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struct strmap dir_renames[3];
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/*
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* relevant_sources: deleted paths wanted in rename detection, and why
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*
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* relevant_sources is a set of deleted paths on each side of
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* history for which we need rename detection. If a path is deleted
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* on one side of history, we need to detect if it is part of a
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* rename if either
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* * the file is modified/deleted on the other side of history
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* * we need to detect renames for an ancestor directory
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* If neither of those are true, we can skip rename detection for
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* that path. The reason is stored as a value from enum
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* file_rename_relevance, as the reason can inform the algorithm in
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* diffcore_rename_extended().
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*/
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struct strintmap relevant_sources[3];
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/*
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* dir_rename_mask:
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* 0: optimization removing unmodified potential rename source okay
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* 2 or 4: optimization okay, but must check for files added to dir
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* 7: optimization forbidden; need rename source in case of dir rename
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*/
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unsigned dir_rename_mask:3;
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/*
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* callback_data_*: supporting data structures for alternate traversal
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*
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* We sometimes need to be able to traverse through all the files
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* in a given tree before all immediate subdirectories within that
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* tree. Since traverse_trees() doesn't do that naturally, we have
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* a traverse_trees_wrapper() that stores any immediate
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* subdirectories while traversing files, then traverses the
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* immediate subdirectories later. These callback_data* variables
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* store the information for the subdirectories so that we can do
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* that traversal order.
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*/
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struct traversal_callback_data *callback_data;
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int callback_data_nr, callback_data_alloc;
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char *callback_data_traverse_path;
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/*
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* needed_limit: value needed for inexact rename detection to run
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*
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* If the current rename limit wasn't high enough for inexact
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* rename detection to run, this records the limit needed. Otherwise,
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* this value remains 0.
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*/
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int needed_limit;
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};
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struct merge_options_internal {
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/*
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* paths: primary data structure in all of merge ort.
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*
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* The keys of paths:
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* * are full relative paths from the toplevel of the repository
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* (e.g. "drivers/firmware/raspberrypi.c").
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* * store all relevant paths in the repo, both directories and
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* files (e.g. drivers, drivers/firmware would also be included)
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* * these keys serve to intern all the path strings, which allows
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* us to do pointer comparison on directory names instead of
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* strcmp; we just have to be careful to use the interned strings.
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* (Technically paths_to_free may track some strings that were
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* removed from froms paths.)
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*
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* The values of paths:
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* * either a pointer to a merged_info, or a conflict_info struct
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* * merged_info contains all relevant information for a
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* non-conflicted entry.
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* * conflict_info contains a merged_info, plus any additional
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* information about a conflict such as the higher orders stages
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* involved and the names of the paths those came from (handy
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* once renames get involved).
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* * a path may start "conflicted" (i.e. point to a conflict_info)
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* and then a later step (e.g. three-way content merge) determines
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* it can be cleanly merged, at which point it'll be marked clean
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* and the algorithm will ignore any data outside the contained
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* merged_info for that entry
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* * If an entry remains conflicted, the merged_info portion of a
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* conflict_info will later be filled with whatever version of
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* the file should be placed in the working directory (e.g. an
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* as-merged-as-possible variation that contains conflict markers).
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*/
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struct strmap paths;
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/*
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* conflicted: a subset of keys->values from "paths"
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*
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* conflicted is basically an optimization between process_entries()
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* and record_conflicted_index_entries(); the latter could loop over
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* ALL the entries in paths AGAIN and look for the ones that are
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* still conflicted, but since process_entries() has to loop over
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* all of them, it saves the ones it couldn't resolve in this strmap
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* so that record_conflicted_index_entries() can iterate just the
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* relevant entries.
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*/
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struct strmap conflicted;
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/*
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* paths_to_free: additional list of strings to free
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*
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* If keys are removed from "paths", they are added to paths_to_free
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* to ensure they are later freed. We avoid free'ing immediately since
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* other places (e.g. conflict_info.pathnames[]) may still be
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* referencing these paths.
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*/
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struct string_list paths_to_free;
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/*
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* output: special messages and conflict notices for various paths
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*
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* This is a map of pathnames (a subset of the keys in "paths" above)
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* to strbufs. It gathers various warning/conflict/notice messages
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* for later processing.
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*/
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struct strmap output;
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/*
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* renames: various data relating to rename detection
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*/
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struct rename_info renames;
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/*
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* attr_index: hacky minimal index used for renormalization
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*
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* renormalization code _requires_ an index, though it only needs to
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* find a .gitattributes file within the index. So, when
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* renormalization is important, we create a special index with just
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* that one file.
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*/
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struct index_state attr_index;
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/*
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* current_dir_name, toplevel_dir: temporary vars
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*
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* These are used in collect_merge_info_callback(), and will set the
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* various merged_info.directory_name for the various paths we get;
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* see documentation for that variable and the requirements placed on
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* that field.
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*/
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const char *current_dir_name;
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const char *toplevel_dir;
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/* call_depth: recursion level counter for merging merge bases */
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int call_depth;
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};
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struct version_info {
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struct object_id oid;
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unsigned short mode;
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};
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struct merged_info {
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/* if is_null, ignore result. otherwise result has oid & mode */
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struct version_info result;
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unsigned is_null:1;
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/*
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* clean: whether the path in question is cleanly merged.
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*
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* see conflict_info.merged for more details.
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*/
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unsigned clean:1;
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/*
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* basename_offset: offset of basename of path.
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*
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* perf optimization to avoid recomputing offset of final '/'
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* character in pathname (0 if no '/' in pathname).
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*/
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size_t basename_offset;
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/*
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* directory_name: containing directory name.
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*
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* Note that we assume directory_name is constructed such that
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* strcmp(dir1_name, dir2_name) == 0 iff dir1_name == dir2_name,
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* i.e. string equality is equivalent to pointer equality. For this
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* to hold, we have to be careful setting directory_name.
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*/
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const char *directory_name;
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};
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struct conflict_info {
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/*
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* merged: the version of the path that will be written to working tree
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*
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* WARNING: It is critical to check merged.clean and ensure it is 0
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* before reading any conflict_info fields outside of merged.
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* Allocated merge_info structs will always have clean set to 1.
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* Allocated conflict_info structs will have merged.clean set to 0
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* initially. The merged.clean field is how we know if it is safe
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* to access other parts of conflict_info besides merged; if a
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* conflict_info's merged.clean is changed to 1, the rest of the
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* algorithm is not allowed to look at anything outside of the
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* merged member anymore.
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*/
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struct merged_info merged;
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/* oids & modes from each of the three trees for this path */
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struct version_info stages[3];
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/* pathnames for each stage; may differ due to rename detection */
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const char *pathnames[3];
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/* Whether this path is/was involved in a directory/file conflict */
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unsigned df_conflict:1;
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/*
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* Whether this path is/was involved in a non-content conflict other
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* than a directory/file conflict (e.g. rename/rename, rename/delete,
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* file location based on possible directory rename).
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*/
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unsigned path_conflict:1;
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/*
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* For filemask and dirmask, the ith bit corresponds to whether the
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* ith entry is a file (filemask) or a directory (dirmask). Thus,
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* filemask & dirmask is always zero, and filemask | dirmask is at
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* most 7 but can be less when a path does not appear as either a
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* file or a directory on at least one side of history.
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*
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* Note that these masks are related to enum merge_side, as the ith
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* entry corresponds to side i.
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*
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* These values come from a traverse_trees() call; more info may be
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* found looking at tree-walk.h's struct traverse_info,
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* particularly the documentation above the "fn" member (note that
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* filemask = mask & ~dirmask from that documentation).
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*/
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unsigned filemask:3;
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unsigned dirmask:3;
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/*
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* Optimization to track which stages match, to avoid the need to
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* recompute it in multiple steps. Either 0 or at least 2 bits are
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* set; if at least 2 bits are set, their corresponding stages match.
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*/
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unsigned match_mask:3;
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};
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/*** Function Grouping: various utility functions ***/
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/*
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* For the next three macros, see warning for conflict_info.merged.
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*
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* In each of the below, mi is a struct merged_info*, and ci was defined
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* as a struct conflict_info* (but we need to verify ci isn't actually
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* pointed at a struct merged_info*).
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*
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* INITIALIZE_CI: Assign ci to mi but only if it's safe; set to NULL otherwise.
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* VERIFY_CI: Ensure that something we assigned to a conflict_info* is one.
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* ASSIGN_AND_VERIFY_CI: Similar to VERIFY_CI but do assignment first.
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*/
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#define INITIALIZE_CI(ci, mi) do { \
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(ci) = (!(mi) || (mi)->clean) ? NULL : (struct conflict_info *)(mi); \
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} while (0)
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#define VERIFY_CI(ci) assert(ci && !ci->merged.clean);
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#define ASSIGN_AND_VERIFY_CI(ci, mi) do { \
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(ci) = (struct conflict_info *)(mi); \
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assert((ci) && !(mi)->clean); \
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} while (0)
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static void free_strmap_strings(struct strmap *map)
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{
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struct hashmap_iter iter;
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struct strmap_entry *entry;
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strmap_for_each_entry(map, &iter, entry) {
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free((char*)entry->key);
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}
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}
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static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
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int reinitialize)
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{
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struct rename_info *renames = &opti->renames;
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int i;
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void (*strmap_func)(struct strmap *, int) =
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reinitialize ? strmap_partial_clear : strmap_clear;
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void (*strintmap_func)(struct strintmap *) =
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reinitialize ? strintmap_partial_clear : strintmap_clear;
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/*
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* We marked opti->paths with strdup_strings = 0, so that we
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* wouldn't have to make another copy of the fullpath created by
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* make_traverse_path from setup_path_info(). But, now that we've
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* used it and have no other references to these strings, it is time
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* to deallocate them.
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*/
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free_strmap_strings(&opti->paths);
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strmap_func(&opti->paths, 1);
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/*
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* All keys and values in opti->conflicted are a subset of those in
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* opti->paths. We don't want to deallocate anything twice, so we
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* don't free the keys and we pass 0 for free_values.
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*/
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strmap_func(&opti->conflicted, 0);
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/*
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* opti->paths_to_free is similar to opti->paths; we created it with
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* strdup_strings = 0 to avoid making _another_ copy of the fullpath
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* but now that we've used it and have no other references to these
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* strings, it is time to deallocate them. We do so by temporarily
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* setting strdup_strings to 1.
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*/
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opti->paths_to_free.strdup_strings = 1;
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string_list_clear(&opti->paths_to_free, 0);
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opti->paths_to_free.strdup_strings = 0;
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if (opti->attr_index.cache_nr) /* true iff opt->renormalize */
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discard_index(&opti->attr_index);
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/* Free memory used by various renames maps */
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for (i = MERGE_SIDE1; i <= MERGE_SIDE2; ++i) {
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strintmap_func(&renames->dirs_removed[i]);
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partial_clear_dir_rename_count(&renames->dir_rename_count[i]);
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if (!reinitialize)
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strmap_clear(&renames->dir_rename_count[i], 1);
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strmap_func(&renames->dir_renames[i], 0);
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strintmap_func(&renames->relevant_sources[i]);
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}
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if (!reinitialize) {
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struct hashmap_iter iter;
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struct strmap_entry *e;
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/* Release and free each strbuf found in output */
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strmap_for_each_entry(&opti->output, &iter, e) {
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struct strbuf *sb = e->value;
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strbuf_release(sb);
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/*
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* While strictly speaking we don't need to free(sb)
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* here because we could pass free_values=1 when
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* calling strmap_clear() on opti->output, that would
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* require strmap_clear to do another
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* strmap_for_each_entry() loop, so we just free it
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* while we're iterating anyway.
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*/
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free(sb);
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}
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strmap_clear(&opti->output, 0);
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}
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renames->dir_rename_mask = 0;
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/* Clean out callback_data as well. */
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FREE_AND_NULL(renames->callback_data);
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renames->callback_data_nr = renames->callback_data_alloc = 0;
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}
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static int err(struct merge_options *opt, const char *err, ...)
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{
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va_list params;
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struct strbuf sb = STRBUF_INIT;
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strbuf_addstr(&sb, "error: ");
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va_start(params, err);
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strbuf_vaddf(&sb, err, params);
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va_end(params);
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error("%s", sb.buf);
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strbuf_release(&sb);
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return -1;
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}
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static void format_commit(struct strbuf *sb,
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int indent,
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struct commit *commit)
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{
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struct merge_remote_desc *desc;
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struct pretty_print_context ctx = {0};
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ctx.abbrev = DEFAULT_ABBREV;
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strbuf_addchars(sb, ' ', indent);
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desc = merge_remote_util(commit);
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if (desc) {
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strbuf_addf(sb, "virtual %s\n", desc->name);
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return;
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}
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format_commit_message(commit, "%h %s", sb, &ctx);
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strbuf_addch(sb, '\n');
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}
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__attribute__((format (printf, 4, 5)))
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static void path_msg(struct merge_options *opt,
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const char *path,
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int omittable_hint, /* skippable under --remerge-diff */
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const char *fmt, ...)
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{
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va_list ap;
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struct strbuf *sb = strmap_get(&opt->priv->output, path);
|
|
if (!sb) {
|
|
sb = xmalloc(sizeof(*sb));
|
|
strbuf_init(sb, 0);
|
|
strmap_put(&opt->priv->output, path, sb);
|
|
}
|
|
|
|
va_start(ap, fmt);
|
|
strbuf_vaddf(sb, fmt, ap);
|
|
va_end(ap);
|
|
|
|
strbuf_addch(sb, '\n');
|
|
}
|
|
|
|
/* add a string to a strbuf, but converting "/" to "_" */
|
|
static void add_flattened_path(struct strbuf *out, const char *s)
|
|
{
|
|
size_t i = out->len;
|
|
strbuf_addstr(out, s);
|
|
for (; i < out->len; i++)
|
|
if (out->buf[i] == '/')
|
|
out->buf[i] = '_';
|
|
}
|
|
|
|
static char *unique_path(struct strmap *existing_paths,
|
|
const char *path,
|
|
const char *branch)
|
|
{
|
|
struct strbuf newpath = STRBUF_INIT;
|
|
int suffix = 0;
|
|
size_t base_len;
|
|
|
|
strbuf_addf(&newpath, "%s~", path);
|
|
add_flattened_path(&newpath, branch);
|
|
|
|
base_len = newpath.len;
|
|
while (strmap_contains(existing_paths, newpath.buf)) {
|
|
strbuf_setlen(&newpath, base_len);
|
|
strbuf_addf(&newpath, "_%d", suffix++);
|
|
}
|
|
|
|
return strbuf_detach(&newpath, NULL);
|
|
}
|
|
|
|
/*** Function Grouping: functions related to collect_merge_info() ***/
|
|
|
|
static int traverse_trees_wrapper_callback(int n,
|
|
unsigned long mask,
|
|
unsigned long dirmask,
|
|
struct name_entry *names,
|
|
struct traverse_info *info)
|
|
{
|
|
struct merge_options *opt = info->data;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
unsigned filemask = mask & ~dirmask;
|
|
|
|
assert(n==3);
|
|
|
|
if (!renames->callback_data_traverse_path)
|
|
renames->callback_data_traverse_path = xstrdup(info->traverse_path);
|
|
|
|
if (filemask && filemask == renames->dir_rename_mask)
|
|
renames->dir_rename_mask = 0x07;
|
|
|
|
ALLOC_GROW(renames->callback_data, renames->callback_data_nr + 1,
|
|
renames->callback_data_alloc);
|
|
renames->callback_data[renames->callback_data_nr].mask = mask;
|
|
renames->callback_data[renames->callback_data_nr].dirmask = dirmask;
|
|
COPY_ARRAY(renames->callback_data[renames->callback_data_nr].names,
|
|
names, 3);
|
|
renames->callback_data_nr++;
|
|
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* Much like traverse_trees(), BUT:
|
|
* - read all the tree entries FIRST, saving them
|
|
* - note that the above step provides an opportunity to compute necessary
|
|
* additional details before the "real" traversal
|
|
* - loop through the saved entries and call the original callback on them
|
|
*/
|
|
static int traverse_trees_wrapper(struct index_state *istate,
|
|
int n,
|
|
struct tree_desc *t,
|
|
struct traverse_info *info)
|
|
{
|
|
int ret, i, old_offset;
|
|
traverse_callback_t old_fn;
|
|
char *old_callback_data_traverse_path;
|
|
struct merge_options *opt = info->data;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
assert(renames->dir_rename_mask == 2 || renames->dir_rename_mask == 4);
|
|
|
|
old_callback_data_traverse_path = renames->callback_data_traverse_path;
|
|
old_fn = info->fn;
|
|
old_offset = renames->callback_data_nr;
|
|
|
|
renames->callback_data_traverse_path = NULL;
|
|
info->fn = traverse_trees_wrapper_callback;
|
|
ret = traverse_trees(istate, n, t, info);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
info->traverse_path = renames->callback_data_traverse_path;
|
|
info->fn = old_fn;
|
|
for (i = old_offset; i < renames->callback_data_nr; ++i) {
|
|
info->fn(n,
|
|
renames->callback_data[i].mask,
|
|
renames->callback_data[i].dirmask,
|
|
renames->callback_data[i].names,
|
|
info);
|
|
}
|
|
|
|
renames->callback_data_nr = old_offset;
|
|
free(renames->callback_data_traverse_path);
|
|
renames->callback_data_traverse_path = old_callback_data_traverse_path;
|
|
info->traverse_path = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static void setup_path_info(struct merge_options *opt,
|
|
struct string_list_item *result,
|
|
const char *current_dir_name,
|
|
int current_dir_name_len,
|
|
char *fullpath, /* we'll take over ownership */
|
|
struct name_entry *names,
|
|
struct name_entry *merged_version,
|
|
unsigned is_null, /* boolean */
|
|
unsigned df_conflict, /* boolean */
|
|
unsigned filemask,
|
|
unsigned dirmask,
|
|
int resolved /* boolean */)
|
|
{
|
|
/* result->util is void*, so mi is a convenience typed variable */
|
|
struct merged_info *mi;
|
|
|
|
assert(!is_null || resolved);
|
|
assert(!df_conflict || !resolved); /* df_conflict implies !resolved */
|
|
assert(resolved == (merged_version != NULL));
|
|
|
|
mi = xcalloc(1, resolved ? sizeof(struct merged_info) :
|
|
sizeof(struct conflict_info));
|
|
mi->directory_name = current_dir_name;
|
|
mi->basename_offset = current_dir_name_len;
|
|
mi->clean = !!resolved;
|
|
if (resolved) {
|
|
mi->result.mode = merged_version->mode;
|
|
oidcpy(&mi->result.oid, &merged_version->oid);
|
|
mi->is_null = !!is_null;
|
|
} else {
|
|
int i;
|
|
struct conflict_info *ci;
|
|
|
|
ASSIGN_AND_VERIFY_CI(ci, mi);
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
ci->pathnames[i] = fullpath;
|
|
ci->stages[i].mode = names[i].mode;
|
|
oidcpy(&ci->stages[i].oid, &names[i].oid);
|
|
}
|
|
ci->filemask = filemask;
|
|
ci->dirmask = dirmask;
|
|
ci->df_conflict = !!df_conflict;
|
|
if (dirmask)
|
|
/*
|
|
* Assume is_null for now, but if we have entries
|
|
* under the directory then when it is complete in
|
|
* write_completed_directory() it'll update this.
|
|
* Also, for D/F conflicts, we have to handle the
|
|
* directory first, then clear this bit and process
|
|
* the file to see how it is handled -- that occurs
|
|
* near the top of process_entry().
|
|
*/
|
|
mi->is_null = 1;
|
|
}
|
|
strmap_put(&opt->priv->paths, fullpath, mi);
|
|
result->string = fullpath;
|
|
result->util = mi;
|
|
}
|
|
|
|
static void add_pair(struct merge_options *opt,
|
|
struct name_entry *names,
|
|
const char *pathname,
|
|
unsigned side,
|
|
unsigned is_add /* if false, is_delete */,
|
|
unsigned match_mask,
|
|
unsigned dir_rename_mask)
|
|
{
|
|
struct diff_filespec *one, *two;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
int names_idx = is_add ? side : 0;
|
|
|
|
if (!is_add) {
|
|
unsigned content_relevant = (match_mask == 0);
|
|
unsigned location_relevant = (dir_rename_mask == 0x07);
|
|
|
|
if (content_relevant || location_relevant) {
|
|
/* content_relevant trumps location_relevant */
|
|
strintmap_set(&renames->relevant_sources[side], pathname,
|
|
content_relevant ? RELEVANT_CONTENT : RELEVANT_LOCATION);
|
|
}
|
|
}
|
|
|
|
one = alloc_filespec(pathname);
|
|
two = alloc_filespec(pathname);
|
|
fill_filespec(is_add ? two : one,
|
|
&names[names_idx].oid, 1, names[names_idx].mode);
|
|
diff_queue(&renames->pairs[side], one, two);
|
|
}
|
|
|
|
static void collect_rename_info(struct merge_options *opt,
|
|
struct name_entry *names,
|
|
const char *dirname,
|
|
const char *fullname,
|
|
unsigned filemask,
|
|
unsigned dirmask,
|
|
unsigned match_mask)
|
|
{
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
unsigned side;
|
|
|
|
/*
|
|
* Update dir_rename_mask (determines ignore-rename-source validity)
|
|
*
|
|
* dir_rename_mask helps us keep track of when directory rename
|
|
* detection may be relevant. Basically, whenver a directory is
|
|
* removed on one side of history, and a file is added to that
|
|
* directory on the other side of history, directory rename
|
|
* detection is relevant (meaning we have to detect renames for all
|
|
* files within that directory to deduce where the directory
|
|
* moved). Also, whenever a directory needs directory rename
|
|
* detection, due to the "majority rules" choice for where to move
|
|
* it (see t6423 testcase 1f), we also need to detect renames for
|
|
* all files within subdirectories of that directory as well.
|
|
*
|
|
* Here we haven't looked at files within the directory yet, we are
|
|
* just looking at the directory itself. So, if we aren't yet in
|
|
* a case where a parent directory needed directory rename detection
|
|
* (i.e. dir_rename_mask != 0x07), and if the directory was removed
|
|
* on one side of history, record the mask of the other side of
|
|
* history in dir_rename_mask.
|
|
*/
|
|
if (renames->dir_rename_mask != 0x07 &&
|
|
(dirmask == 3 || dirmask == 5)) {
|
|
/* simple sanity check */
|
|
assert(renames->dir_rename_mask == 0 ||
|
|
renames->dir_rename_mask == (dirmask & ~1));
|
|
/* update dir_rename_mask; have it record mask of new side */
|
|
renames->dir_rename_mask = (dirmask & ~1);
|
|
}
|
|
|
|
/* Update dirs_removed, as needed */
|
|
if (dirmask == 1 || dirmask == 3 || dirmask == 5) {
|
|
/* absent_mask = 0x07 - dirmask; sides = absent_mask/2 */
|
|
unsigned sides = (0x07 - dirmask)/2;
|
|
unsigned relevance = (renames->dir_rename_mask == 0x07) ?
|
|
RELEVANT_FOR_ANCESTOR : NOT_RELEVANT;
|
|
/*
|
|
* Record relevance of this directory. However, note that
|
|
* when collect_merge_info_callback() recurses into this
|
|
* directory and calls collect_rename_info() on paths
|
|
* within that directory, if we find a path that was added
|
|
* to this directory on the other side of history, we will
|
|
* upgrade this value to RELEVANT_FOR_SELF; see below.
|
|
*/
|
|
if (sides & 1)
|
|
strintmap_set(&renames->dirs_removed[1], fullname,
|
|
relevance);
|
|
if (sides & 2)
|
|
strintmap_set(&renames->dirs_removed[2], fullname,
|
|
relevance);
|
|
}
|
|
|
|
/*
|
|
* Here's the block that potentially upgrades to RELEVANT_FOR_SELF.
|
|
* When we run across a file added to a directory. In such a case,
|
|
* find the directory of the file and upgrade its relevance.
|
|
*/
|
|
if (renames->dir_rename_mask == 0x07 &&
|
|
(filemask == 2 || filemask == 4)) {
|
|
/*
|
|
* Need directory rename for parent directory on other side
|
|
* of history from added file. Thus
|
|
* side = (~filemask & 0x06) >> 1
|
|
* or
|
|
* side = 3 - (filemask/2).
|
|
*/
|
|
unsigned side = 3 - (filemask >> 1);
|
|
strintmap_set(&renames->dirs_removed[side], dirname,
|
|
RELEVANT_FOR_SELF);
|
|
}
|
|
|
|
if (filemask == 0 || filemask == 7)
|
|
return;
|
|
|
|
for (side = MERGE_SIDE1; side <= MERGE_SIDE2; ++side) {
|
|
unsigned side_mask = (1 << side);
|
|
|
|
/* Check for deletion on side */
|
|
if ((filemask & 1) && !(filemask & side_mask))
|
|
add_pair(opt, names, fullname, side, 0 /* delete */,
|
|
match_mask & filemask,
|
|
renames->dir_rename_mask);
|
|
|
|
/* Check for addition on side */
|
|
if (!(filemask & 1) && (filemask & side_mask))
|
|
add_pair(opt, names, fullname, side, 1 /* add */,
|
|
match_mask & filemask,
|
|
renames->dir_rename_mask);
|
|
}
|
|
}
|
|
|
|
static int collect_merge_info_callback(int n,
|
|
unsigned long mask,
|
|
unsigned long dirmask,
|
|
struct name_entry *names,
|
|
struct traverse_info *info)
|
|
{
|
|
/*
|
|
* n is 3. Always.
|
|
* common ancestor (mbase) has mask 1, and stored in index 0 of names
|
|
* head of side 1 (side1) has mask 2, and stored in index 1 of names
|
|
* head of side 2 (side2) has mask 4, and stored in index 2 of names
|
|
*/
|
|
struct merge_options *opt = info->data;
|
|
struct merge_options_internal *opti = opt->priv;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
struct string_list_item pi; /* Path Info */
|
|
struct conflict_info *ci; /* typed alias to pi.util (which is void*) */
|
|
struct name_entry *p;
|
|
size_t len;
|
|
char *fullpath;
|
|
const char *dirname = opti->current_dir_name;
|
|
unsigned prev_dir_rename_mask = renames->dir_rename_mask;
|
|
unsigned filemask = mask & ~dirmask;
|
|
unsigned match_mask = 0; /* will be updated below */
|
|
unsigned mbase_null = !(mask & 1);
|
|
unsigned side1_null = !(mask & 2);
|
|
unsigned side2_null = !(mask & 4);
|
|
unsigned side1_matches_mbase = (!side1_null && !mbase_null &&
|
|
names[0].mode == names[1].mode &&
|
|
oideq(&names[0].oid, &names[1].oid));
|
|
unsigned side2_matches_mbase = (!side2_null && !mbase_null &&
|
|
names[0].mode == names[2].mode &&
|
|
oideq(&names[0].oid, &names[2].oid));
|
|
unsigned sides_match = (!side1_null && !side2_null &&
|
|
names[1].mode == names[2].mode &&
|
|
oideq(&names[1].oid, &names[2].oid));
|
|
|
|
/*
|
|
* Note: When a path is a file on one side of history and a directory
|
|
* in another, we have a directory/file conflict. In such cases, if
|
|
* the conflict doesn't resolve from renames and deletions, then we
|
|
* always leave directories where they are and move files out of the
|
|
* way. Thus, while struct conflict_info has a df_conflict field to
|
|
* track such conflicts, we ignore that field for any directories at
|
|
* a path and only pay attention to it for files at the given path.
|
|
* The fact that we leave directories were they are also means that
|
|
* we do not need to worry about getting additional df_conflict
|
|
* information propagated from parent directories down to children
|
|
* (unlike, say traverse_trees_recursive() in unpack-trees.c, which
|
|
* sets a newinfo.df_conflicts field specifically to propagate it).
|
|
*/
|
|
unsigned df_conflict = (filemask != 0) && (dirmask != 0);
|
|
|
|
/* n = 3 is a fundamental assumption. */
|
|
if (n != 3)
|
|
BUG("Called collect_merge_info_callback wrong");
|
|
|
|
/*
|
|
* A bunch of sanity checks verifying that traverse_trees() calls
|
|
* us the way I expect. Could just remove these at some point,
|
|
* though maybe they are helpful to future code readers.
|
|
*/
|
|
assert(mbase_null == is_null_oid(&names[0].oid));
|
|
assert(side1_null == is_null_oid(&names[1].oid));
|
|
assert(side2_null == is_null_oid(&names[2].oid));
|
|
assert(!mbase_null || !side1_null || !side2_null);
|
|
assert(mask > 0 && mask < 8);
|
|
|
|
/* Determine match_mask */
|
|
if (side1_matches_mbase)
|
|
match_mask = (side2_matches_mbase ? 7 : 3);
|
|
else if (side2_matches_mbase)
|
|
match_mask = 5;
|
|
else if (sides_match)
|
|
match_mask = 6;
|
|
|
|
/*
|
|
* Get the name of the relevant filepath, which we'll pass to
|
|
* setup_path_info() for tracking.
|
|
*/
|
|
p = names;
|
|
while (!p->mode)
|
|
p++;
|
|
len = traverse_path_len(info, p->pathlen);
|
|
|
|
/* +1 in both of the following lines to include the NUL byte */
|
|
fullpath = xmalloc(len + 1);
|
|
make_traverse_path(fullpath, len + 1, info, p->path, p->pathlen);
|
|
|
|
/*
|
|
* If mbase, side1, and side2 all match, we can resolve early. Even
|
|
* if these are trees, there will be no renames or anything
|
|
* underneath.
|
|
*/
|
|
if (side1_matches_mbase && side2_matches_mbase) {
|
|
/* mbase, side1, & side2 all match; use mbase as resolution */
|
|
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
|
|
names, names+0, mbase_null, 0,
|
|
filemask, dirmask, 1);
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* Gather additional information used in rename detection.
|
|
*/
|
|
collect_rename_info(opt, names, dirname, fullpath,
|
|
filemask, dirmask, match_mask);
|
|
|
|
/*
|
|
* Record information about the path so we can resolve later in
|
|
* process_entries.
|
|
*/
|
|
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
|
|
names, NULL, 0, df_conflict, filemask, dirmask, 0);
|
|
|
|
ci = pi.util;
|
|
VERIFY_CI(ci);
|
|
ci->match_mask = match_mask;
|
|
|
|
/* If dirmask, recurse into subdirectories */
|
|
if (dirmask) {
|
|
struct traverse_info newinfo;
|
|
struct tree_desc t[3];
|
|
void *buf[3] = {NULL, NULL, NULL};
|
|
const char *original_dir_name;
|
|
int i, ret;
|
|
|
|
ci->match_mask &= filemask;
|
|
newinfo = *info;
|
|
newinfo.prev = info;
|
|
newinfo.name = p->path;
|
|
newinfo.namelen = p->pathlen;
|
|
newinfo.pathlen = st_add3(newinfo.pathlen, p->pathlen, 1);
|
|
/*
|
|
* If this directory we are about to recurse into cared about
|
|
* its parent directory (the current directory) having a D/F
|
|
* conflict, then we'd propagate the masks in this way:
|
|
* newinfo.df_conflicts |= (mask & ~dirmask);
|
|
* But we don't worry about propagating D/F conflicts. (See
|
|
* comment near setting of local df_conflict variable near
|
|
* the beginning of this function).
|
|
*/
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
if (i == 1 && side1_matches_mbase)
|
|
t[1] = t[0];
|
|
else if (i == 2 && side2_matches_mbase)
|
|
t[2] = t[0];
|
|
else if (i == 2 && sides_match)
|
|
t[2] = t[1];
|
|
else {
|
|
const struct object_id *oid = NULL;
|
|
if (dirmask & 1)
|
|
oid = &names[i].oid;
|
|
buf[i] = fill_tree_descriptor(opt->repo,
|
|
t + i, oid);
|
|
}
|
|
dirmask >>= 1;
|
|
}
|
|
|
|
original_dir_name = opti->current_dir_name;
|
|
opti->current_dir_name = pi.string;
|
|
if (renames->dir_rename_mask == 0 ||
|
|
renames->dir_rename_mask == 0x07)
|
|
ret = traverse_trees(NULL, 3, t, &newinfo);
|
|
else
|
|
ret = traverse_trees_wrapper(NULL, 3, t, &newinfo);
|
|
opti->current_dir_name = original_dir_name;
|
|
renames->dir_rename_mask = prev_dir_rename_mask;
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++)
|
|
free(buf[i]);
|
|
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int collect_merge_info(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2)
|
|
{
|
|
int ret;
|
|
struct tree_desc t[3];
|
|
struct traverse_info info;
|
|
|
|
opt->priv->toplevel_dir = "";
|
|
opt->priv->current_dir_name = opt->priv->toplevel_dir;
|
|
setup_traverse_info(&info, opt->priv->toplevel_dir);
|
|
info.fn = collect_merge_info_callback;
|
|
info.data = opt;
|
|
info.show_all_errors = 1;
|
|
|
|
parse_tree(merge_base);
|
|
parse_tree(side1);
|
|
parse_tree(side2);
|
|
init_tree_desc(t + 0, merge_base->buffer, merge_base->size);
|
|
init_tree_desc(t + 1, side1->buffer, side1->size);
|
|
init_tree_desc(t + 2, side2->buffer, side2->size);
|
|
|
|
trace2_region_enter("merge", "traverse_trees", opt->repo);
|
|
ret = traverse_trees(NULL, 3, t, &info);
|
|
trace2_region_leave("merge", "traverse_trees", opt->repo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to threeway content merges ***/
|
|
|
|
static int find_first_merges(struct repository *repo,
|
|
const char *path,
|
|
struct commit *a,
|
|
struct commit *b,
|
|
struct object_array *result)
|
|
{
|
|
int i, j;
|
|
struct object_array merges = OBJECT_ARRAY_INIT;
|
|
struct commit *commit;
|
|
int contains_another;
|
|
|
|
char merged_revision[GIT_MAX_HEXSZ + 2];
|
|
const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
|
|
"--all", merged_revision, NULL };
|
|
struct rev_info revs;
|
|
struct setup_revision_opt rev_opts;
|
|
|
|
memset(result, 0, sizeof(struct object_array));
|
|
memset(&rev_opts, 0, sizeof(rev_opts));
|
|
|
|
/* get all revisions that merge commit a */
|
|
xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
|
|
oid_to_hex(&a->object.oid));
|
|
repo_init_revisions(repo, &revs, NULL);
|
|
rev_opts.submodule = path;
|
|
/* FIXME: can't handle linked worktrees in submodules yet */
|
|
revs.single_worktree = path != NULL;
|
|
setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
|
|
|
|
/* save all revisions from the above list that contain b */
|
|
if (prepare_revision_walk(&revs))
|
|
die("revision walk setup failed");
|
|
while ((commit = get_revision(&revs)) != NULL) {
|
|
struct object *o = &(commit->object);
|
|
if (in_merge_bases(b, commit))
|
|
add_object_array(o, NULL, &merges);
|
|
}
|
|
reset_revision_walk();
|
|
|
|
/* Now we've got all merges that contain a and b. Prune all
|
|
* merges that contain another found merge and save them in
|
|
* result.
|
|
*/
|
|
for (i = 0; i < merges.nr; i++) {
|
|
struct commit *m1 = (struct commit *) merges.objects[i].item;
|
|
|
|
contains_another = 0;
|
|
for (j = 0; j < merges.nr; j++) {
|
|
struct commit *m2 = (struct commit *) merges.objects[j].item;
|
|
if (i != j && in_merge_bases(m2, m1)) {
|
|
contains_another = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!contains_another)
|
|
add_object_array(merges.objects[i].item, NULL, result);
|
|
}
|
|
|
|
object_array_clear(&merges);
|
|
return result->nr;
|
|
}
|
|
|
|
static int merge_submodule(struct merge_options *opt,
|
|
const char *path,
|
|
const struct object_id *o,
|
|
const struct object_id *a,
|
|
const struct object_id *b,
|
|
struct object_id *result)
|
|
{
|
|
struct commit *commit_o, *commit_a, *commit_b;
|
|
int parent_count;
|
|
struct object_array merges;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
int i;
|
|
int search = !opt->priv->call_depth;
|
|
|
|
/* store fallback answer in result in case we fail */
|
|
oidcpy(result, opt->priv->call_depth ? o : a);
|
|
|
|
/* we can not handle deletion conflicts */
|
|
if (is_null_oid(o))
|
|
return 0;
|
|
if (is_null_oid(a))
|
|
return 0;
|
|
if (is_null_oid(b))
|
|
return 0;
|
|
|
|
if (add_submodule_odb(path)) {
|
|
path_msg(opt, path, 0,
|
|
_("Failed to merge submodule %s (not checked out)"),
|
|
path);
|
|
return 0;
|
|
}
|
|
|
|
if (!(commit_o = lookup_commit_reference(opt->repo, o)) ||
|
|
!(commit_a = lookup_commit_reference(opt->repo, a)) ||
|
|
!(commit_b = lookup_commit_reference(opt->repo, b))) {
|
|
path_msg(opt, path, 0,
|
|
_("Failed to merge submodule %s (commits not present)"),
|
|
path);
|
|
return 0;
|
|
}
|
|
|
|
/* check whether both changes are forward */
|
|
if (!in_merge_bases(commit_o, commit_a) ||
|
|
!in_merge_bases(commit_o, commit_b)) {
|
|
path_msg(opt, path, 0,
|
|
_("Failed to merge submodule %s "
|
|
"(commits don't follow merge-base)"),
|
|
path);
|
|
return 0;
|
|
}
|
|
|
|
/* Case #1: a is contained in b or vice versa */
|
|
if (in_merge_bases(commit_a, commit_b)) {
|
|
oidcpy(result, b);
|
|
path_msg(opt, path, 1,
|
|
_("Note: Fast-forwarding submodule %s to %s"),
|
|
path, oid_to_hex(b));
|
|
return 1;
|
|
}
|
|
if (in_merge_bases(commit_b, commit_a)) {
|
|
oidcpy(result, a);
|
|
path_msg(opt, path, 1,
|
|
_("Note: Fast-forwarding submodule %s to %s"),
|
|
path, oid_to_hex(a));
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Case #2: There are one or more merges that contain a and b in
|
|
* the submodule. If there is only one, then present it as a
|
|
* suggestion to the user, but leave it marked unmerged so the
|
|
* user needs to confirm the resolution.
|
|
*/
|
|
|
|
/* Skip the search if makes no sense to the calling context. */
|
|
if (!search)
|
|
return 0;
|
|
|
|
/* find commit which merges them */
|
|
parent_count = find_first_merges(opt->repo, path, commit_a, commit_b,
|
|
&merges);
|
|
switch (parent_count) {
|
|
case 0:
|
|
path_msg(opt, path, 0, _("Failed to merge submodule %s"), path);
|
|
break;
|
|
|
|
case 1:
|
|
format_commit(&sb, 4,
|
|
(struct commit *)merges.objects[0].item);
|
|
path_msg(opt, path, 0,
|
|
_("Failed to merge submodule %s, but a possible merge "
|
|
"resolution exists:\n%s\n"),
|
|
path, sb.buf);
|
|
path_msg(opt, path, 1,
|
|
_("If this is correct simply add it to the index "
|
|
"for example\n"
|
|
"by using:\n\n"
|
|
" git update-index --cacheinfo 160000 %s \"%s\"\n\n"
|
|
"which will accept this suggestion.\n"),
|
|
oid_to_hex(&merges.objects[0].item->oid), path);
|
|
strbuf_release(&sb);
|
|
break;
|
|
default:
|
|
for (i = 0; i < merges.nr; i++)
|
|
format_commit(&sb, 4,
|
|
(struct commit *)merges.objects[i].item);
|
|
path_msg(opt, path, 0,
|
|
_("Failed to merge submodule %s, but multiple "
|
|
"possible merges exist:\n%s"), path, sb.buf);
|
|
strbuf_release(&sb);
|
|
}
|
|
|
|
object_array_clear(&merges);
|
|
return 0;
|
|
}
|
|
|
|
static void initialize_attr_index(struct merge_options *opt)
|
|
{
|
|
/*
|
|
* The renormalize_buffer() functions require attributes, and
|
|
* annoyingly those can only be read from the working tree or from
|
|
* an index_state. merge-ort doesn't have an index_state, so we
|
|
* generate a fake one containing only attribute information.
|
|
*/
|
|
struct merged_info *mi;
|
|
struct index_state *attr_index = &opt->priv->attr_index;
|
|
struct cache_entry *ce;
|
|
|
|
attr_index->initialized = 1;
|
|
|
|
if (!opt->renormalize)
|
|
return;
|
|
|
|
mi = strmap_get(&opt->priv->paths, GITATTRIBUTES_FILE);
|
|
if (!mi)
|
|
return;
|
|
|
|
if (mi->clean) {
|
|
int len = strlen(GITATTRIBUTES_FILE);
|
|
ce = make_empty_cache_entry(attr_index, len);
|
|
ce->ce_mode = create_ce_mode(mi->result.mode);
|
|
ce->ce_flags = create_ce_flags(0);
|
|
ce->ce_namelen = len;
|
|
oidcpy(&ce->oid, &mi->result.oid);
|
|
memcpy(ce->name, GITATTRIBUTES_FILE, len);
|
|
add_index_entry(attr_index, ce,
|
|
ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
|
|
get_stream_filter(attr_index, GITATTRIBUTES_FILE, &ce->oid);
|
|
} else {
|
|
int stage, len;
|
|
struct conflict_info *ci;
|
|
|
|
ASSIGN_AND_VERIFY_CI(ci, mi);
|
|
for (stage = 0; stage < 3; stage++) {
|
|
unsigned stage_mask = (1 << stage);
|
|
|
|
if (!(ci->filemask & stage_mask))
|
|
continue;
|
|
len = strlen(GITATTRIBUTES_FILE);
|
|
ce = make_empty_cache_entry(attr_index, len);
|
|
ce->ce_mode = create_ce_mode(ci->stages[stage].mode);
|
|
ce->ce_flags = create_ce_flags(stage);
|
|
ce->ce_namelen = len;
|
|
oidcpy(&ce->oid, &ci->stages[stage].oid);
|
|
memcpy(ce->name, GITATTRIBUTES_FILE, len);
|
|
add_index_entry(attr_index, ce,
|
|
ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
|
|
get_stream_filter(attr_index, GITATTRIBUTES_FILE,
|
|
&ce->oid);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int merge_3way(struct merge_options *opt,
|
|
const char *path,
|
|
const struct object_id *o,
|
|
const struct object_id *a,
|
|
const struct object_id *b,
|
|
const char *pathnames[3],
|
|
const int extra_marker_size,
|
|
mmbuffer_t *result_buf)
|
|
{
|
|
mmfile_t orig, src1, src2;
|
|
struct ll_merge_options ll_opts = {0};
|
|
char *base, *name1, *name2;
|
|
int merge_status;
|
|
|
|
if (!opt->priv->attr_index.initialized)
|
|
initialize_attr_index(opt);
|
|
|
|
ll_opts.renormalize = opt->renormalize;
|
|
ll_opts.extra_marker_size = extra_marker_size;
|
|
ll_opts.xdl_opts = opt->xdl_opts;
|
|
|
|
if (opt->priv->call_depth) {
|
|
ll_opts.virtual_ancestor = 1;
|
|
ll_opts.variant = 0;
|
|
} else {
|
|
switch (opt->recursive_variant) {
|
|
case MERGE_VARIANT_OURS:
|
|
ll_opts.variant = XDL_MERGE_FAVOR_OURS;
|
|
break;
|
|
case MERGE_VARIANT_THEIRS:
|
|
ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
|
|
break;
|
|
default:
|
|
ll_opts.variant = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
assert(pathnames[0] && pathnames[1] && pathnames[2] && opt->ancestor);
|
|
if (pathnames[0] == pathnames[1] && pathnames[1] == pathnames[2]) {
|
|
base = mkpathdup("%s", opt->ancestor);
|
|
name1 = mkpathdup("%s", opt->branch1);
|
|
name2 = mkpathdup("%s", opt->branch2);
|
|
} else {
|
|
base = mkpathdup("%s:%s", opt->ancestor, pathnames[0]);
|
|
name1 = mkpathdup("%s:%s", opt->branch1, pathnames[1]);
|
|
name2 = mkpathdup("%s:%s", opt->branch2, pathnames[2]);
|
|
}
|
|
|
|
read_mmblob(&orig, o);
|
|
read_mmblob(&src1, a);
|
|
read_mmblob(&src2, b);
|
|
|
|
merge_status = ll_merge(result_buf, path, &orig, base,
|
|
&src1, name1, &src2, name2,
|
|
&opt->priv->attr_index, &ll_opts);
|
|
|
|
free(base);
|
|
free(name1);
|
|
free(name2);
|
|
free(orig.ptr);
|
|
free(src1.ptr);
|
|
free(src2.ptr);
|
|
return merge_status;
|
|
}
|
|
|
|
static int handle_content_merge(struct merge_options *opt,
|
|
const char *path,
|
|
const struct version_info *o,
|
|
const struct version_info *a,
|
|
const struct version_info *b,
|
|
const char *pathnames[3],
|
|
const int extra_marker_size,
|
|
struct version_info *result)
|
|
{
|
|
/*
|
|
* path is the target location where we want to put the file, and
|
|
* is used to determine any normalization rules in ll_merge.
|
|
*
|
|
* The normal case is that path and all entries in pathnames are
|
|
* identical, though renames can affect which path we got one of
|
|
* the three blobs to merge on various sides of history.
|
|
*
|
|
* extra_marker_size is the amount to extend conflict markers in
|
|
* ll_merge; this is neeed if we have content merges of content
|
|
* merges, which happens for example with rename/rename(2to1) and
|
|
* rename/add conflicts.
|
|
*/
|
|
unsigned clean = 1;
|
|
|
|
/*
|
|
* handle_content_merge() needs both files to be of the same type, i.e.
|
|
* both files OR both submodules OR both symlinks. Conflicting types
|
|
* needs to be handled elsewhere.
|
|
*/
|
|
assert((S_IFMT & a->mode) == (S_IFMT & b->mode));
|
|
|
|
/* Merge modes */
|
|
if (a->mode == b->mode || a->mode == o->mode)
|
|
result->mode = b->mode;
|
|
else {
|
|
/* must be the 100644/100755 case */
|
|
assert(S_ISREG(a->mode));
|
|
result->mode = a->mode;
|
|
clean = (b->mode == o->mode);
|
|
/*
|
|
* FIXME: If opt->priv->call_depth && !clean, then we really
|
|
* should not make result->mode match either a->mode or
|
|
* b->mode; that causes t6036 "check conflicting mode for
|
|
* regular file" to fail. It would be best to use some other
|
|
* mode, but we'll confuse all kinds of stuff if we use one
|
|
* where S_ISREG(result->mode) isn't true, and if we use
|
|
* something like 0100666, then tree-walk.c's calls to
|
|
* canon_mode() will just normalize that to 100644 for us and
|
|
* thus not solve anything.
|
|
*
|
|
* Figure out if there's some kind of way we can work around
|
|
* this...
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Trivial oid merge.
|
|
*
|
|
* Note: While one might assume that the next four lines would
|
|
* be unnecessary due to the fact that match_mask is often
|
|
* setup and already handled, renames don't always take care
|
|
* of that.
|
|
*/
|
|
if (oideq(&a->oid, &b->oid) || oideq(&a->oid, &o->oid))
|
|
oidcpy(&result->oid, &b->oid);
|
|
else if (oideq(&b->oid, &o->oid))
|
|
oidcpy(&result->oid, &a->oid);
|
|
|
|
/* Remaining rules depend on file vs. submodule vs. symlink. */
|
|
else if (S_ISREG(a->mode)) {
|
|
mmbuffer_t result_buf;
|
|
int ret = 0, merge_status;
|
|
int two_way;
|
|
|
|
/*
|
|
* If 'o' is different type, treat it as null so we do a
|
|
* two-way merge.
|
|
*/
|
|
two_way = ((S_IFMT & o->mode) != (S_IFMT & a->mode));
|
|
|
|
merge_status = merge_3way(opt, path,
|
|
two_way ? null_oid() : &o->oid,
|
|
&a->oid, &b->oid,
|
|
pathnames, extra_marker_size,
|
|
&result_buf);
|
|
|
|
if ((merge_status < 0) || !result_buf.ptr)
|
|
ret = err(opt, _("Failed to execute internal merge"));
|
|
|
|
if (!ret &&
|
|
write_object_file(result_buf.ptr, result_buf.size,
|
|
blob_type, &result->oid))
|
|
ret = err(opt, _("Unable to add %s to database"),
|
|
path);
|
|
|
|
free(result_buf.ptr);
|
|
if (ret)
|
|
return -1;
|
|
clean &= (merge_status == 0);
|
|
path_msg(opt, path, 1, _("Auto-merging %s"), path);
|
|
} else if (S_ISGITLINK(a->mode)) {
|
|
int two_way = ((S_IFMT & o->mode) != (S_IFMT & a->mode));
|
|
clean = merge_submodule(opt, pathnames[0],
|
|
two_way ? null_oid() : &o->oid,
|
|
&a->oid, &b->oid, &result->oid);
|
|
if (opt->priv->call_depth && two_way && !clean) {
|
|
result->mode = o->mode;
|
|
oidcpy(&result->oid, &o->oid);
|
|
}
|
|
} else if (S_ISLNK(a->mode)) {
|
|
if (opt->priv->call_depth) {
|
|
clean = 0;
|
|
result->mode = o->mode;
|
|
oidcpy(&result->oid, &o->oid);
|
|
} else {
|
|
switch (opt->recursive_variant) {
|
|
case MERGE_VARIANT_NORMAL:
|
|
clean = 0;
|
|
oidcpy(&result->oid, &a->oid);
|
|
break;
|
|
case MERGE_VARIANT_OURS:
|
|
oidcpy(&result->oid, &a->oid);
|
|
break;
|
|
case MERGE_VARIANT_THEIRS:
|
|
oidcpy(&result->oid, &b->oid);
|
|
break;
|
|
}
|
|
}
|
|
} else
|
|
BUG("unsupported object type in the tree: %06o for %s",
|
|
a->mode, path);
|
|
|
|
return clean;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to detect_and_process_renames(), ***
|
|
*** which are split into directory and regular rename detection sections. ***/
|
|
|
|
/*** Function Grouping: functions related to directory rename detection ***/
|
|
|
|
struct collision_info {
|
|
struct string_list source_files;
|
|
unsigned reported_already:1;
|
|
};
|
|
|
|
/*
|
|
* Return a new string that replaces the beginning portion (which matches
|
|
* rename_info->key), with rename_info->util.new_dir. In perl-speak:
|
|
* new_path_name = (old_path =~ s/rename_info->key/rename_info->value/);
|
|
* NOTE:
|
|
* Caller must ensure that old_path starts with rename_info->key + '/'.
|
|
*/
|
|
static char *apply_dir_rename(struct strmap_entry *rename_info,
|
|
const char *old_path)
|
|
{
|
|
struct strbuf new_path = STRBUF_INIT;
|
|
const char *old_dir = rename_info->key;
|
|
const char *new_dir = rename_info->value;
|
|
int oldlen, newlen, new_dir_len;
|
|
|
|
oldlen = strlen(old_dir);
|
|
if (*new_dir == '\0')
|
|
/*
|
|
* If someone renamed/merged a subdirectory into the root
|
|
* directory (e.g. 'some/subdir' -> ''), then we want to
|
|
* avoid returning
|
|
* '' + '/filename'
|
|
* as the rename; we need to make old_path + oldlen advance
|
|
* past the '/' character.
|
|
*/
|
|
oldlen++;
|
|
new_dir_len = strlen(new_dir);
|
|
newlen = new_dir_len + (strlen(old_path) - oldlen) + 1;
|
|
strbuf_grow(&new_path, newlen);
|
|
strbuf_add(&new_path, new_dir, new_dir_len);
|
|
strbuf_addstr(&new_path, &old_path[oldlen]);
|
|
|
|
return strbuf_detach(&new_path, NULL);
|
|
}
|
|
|
|
static int path_in_way(struct strmap *paths, const char *path, unsigned side_mask)
|
|
{
|
|
struct merged_info *mi = strmap_get(paths, path);
|
|
struct conflict_info *ci;
|
|
if (!mi)
|
|
return 0;
|
|
INITIALIZE_CI(ci, mi);
|
|
return mi->clean || (side_mask & (ci->filemask | ci->dirmask));
|
|
}
|
|
|
|
/*
|
|
* See if there is a directory rename for path, and if there are any file
|
|
* level conflicts on the given side for the renamed location. If there is
|
|
* a rename and there are no conflicts, return the new name. Otherwise,
|
|
* return NULL.
|
|
*/
|
|
static char *handle_path_level_conflicts(struct merge_options *opt,
|
|
const char *path,
|
|
unsigned side_index,
|
|
struct strmap_entry *rename_info,
|
|
struct strmap *collisions)
|
|
{
|
|
char *new_path = NULL;
|
|
struct collision_info *c_info;
|
|
int clean = 1;
|
|
struct strbuf collision_paths = STRBUF_INIT;
|
|
|
|
/*
|
|
* entry has the mapping of old directory name to new directory name
|
|
* that we want to apply to path.
|
|
*/
|
|
new_path = apply_dir_rename(rename_info, path);
|
|
if (!new_path)
|
|
BUG("Failed to apply directory rename!");
|
|
|
|
/*
|
|
* The caller needs to have ensured that it has pre-populated
|
|
* collisions with all paths that map to new_path. Do a quick check
|
|
* to ensure that's the case.
|
|
*/
|
|
c_info = strmap_get(collisions, new_path);
|
|
if (c_info == NULL)
|
|
BUG("c_info is NULL");
|
|
|
|
/*
|
|
* Check for one-sided add/add/.../add conflicts, i.e.
|
|
* where implicit renames from the other side doing
|
|
* directory rename(s) can affect this side of history
|
|
* to put multiple paths into the same location. Warn
|
|
* and bail on directory renames for such paths.
|
|
*/
|
|
if (c_info->reported_already) {
|
|
clean = 0;
|
|
} else if (path_in_way(&opt->priv->paths, new_path, 1 << side_index)) {
|
|
c_info->reported_already = 1;
|
|
strbuf_add_separated_string_list(&collision_paths, ", ",
|
|
&c_info->source_files);
|
|
path_msg(opt, new_path, 0,
|
|
_("CONFLICT (implicit dir rename): Existing file/dir "
|
|
"at %s in the way of implicit directory rename(s) "
|
|
"putting the following path(s) there: %s."),
|
|
new_path, collision_paths.buf);
|
|
clean = 0;
|
|
} else if (c_info->source_files.nr > 1) {
|
|
c_info->reported_already = 1;
|
|
strbuf_add_separated_string_list(&collision_paths, ", ",
|
|
&c_info->source_files);
|
|
path_msg(opt, new_path, 0,
|
|
_("CONFLICT (implicit dir rename): Cannot map more "
|
|
"than one path to %s; implicit directory renames "
|
|
"tried to put these paths there: %s"),
|
|
new_path, collision_paths.buf);
|
|
clean = 0;
|
|
}
|
|
|
|
/* Free memory we no longer need */
|
|
strbuf_release(&collision_paths);
|
|
if (!clean && new_path) {
|
|
free(new_path);
|
|
return NULL;
|
|
}
|
|
|
|
return new_path;
|
|
}
|
|
|
|
static void get_provisional_directory_renames(struct merge_options *opt,
|
|
unsigned side,
|
|
int *clean)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
/*
|
|
* Collapse
|
|
* dir_rename_count: old_directory -> {new_directory -> count}
|
|
* down to
|
|
* dir_renames: old_directory -> best_new_directory
|
|
* where best_new_directory is the one with the unique highest count.
|
|
*/
|
|
strmap_for_each_entry(&renames->dir_rename_count[side], &iter, entry) {
|
|
const char *source_dir = entry->key;
|
|
struct strintmap *counts = entry->value;
|
|
struct hashmap_iter count_iter;
|
|
struct strmap_entry *count_entry;
|
|
int max = 0;
|
|
int bad_max = 0;
|
|
const char *best = NULL;
|
|
|
|
strintmap_for_each_entry(counts, &count_iter, count_entry) {
|
|
const char *target_dir = count_entry->key;
|
|
intptr_t count = (intptr_t)count_entry->value;
|
|
|
|
if (count == max)
|
|
bad_max = max;
|
|
else if (count > max) {
|
|
max = count;
|
|
best = target_dir;
|
|
}
|
|
}
|
|
|
|
if (max == 0)
|
|
continue;
|
|
|
|
if (bad_max == max) {
|
|
path_msg(opt, source_dir, 0,
|
|
_("CONFLICT (directory rename split): "
|
|
"Unclear where to rename %s to; it was "
|
|
"renamed to multiple other directories, with "
|
|
"no destination getting a majority of the "
|
|
"files."),
|
|
source_dir);
|
|
*clean = 0;
|
|
} else {
|
|
strmap_put(&renames->dir_renames[side],
|
|
source_dir, (void*)best);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void handle_directory_level_conflicts(struct merge_options *opt)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
struct string_list duplicated = STRING_LIST_INIT_NODUP;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
struct strmap *side1_dir_renames = &renames->dir_renames[MERGE_SIDE1];
|
|
struct strmap *side2_dir_renames = &renames->dir_renames[MERGE_SIDE2];
|
|
int i;
|
|
|
|
strmap_for_each_entry(side1_dir_renames, &iter, entry) {
|
|
if (strmap_contains(side2_dir_renames, entry->key))
|
|
string_list_append(&duplicated, entry->key);
|
|
}
|
|
|
|
for (i = 0; i < duplicated.nr; i++) {
|
|
strmap_remove(side1_dir_renames, duplicated.items[i].string, 0);
|
|
strmap_remove(side2_dir_renames, duplicated.items[i].string, 0);
|
|
}
|
|
string_list_clear(&duplicated, 0);
|
|
}
|
|
|
|
static struct strmap_entry *check_dir_renamed(const char *path,
|
|
struct strmap *dir_renames)
|
|
{
|
|
char *temp = xstrdup(path);
|
|
char *end;
|
|
struct strmap_entry *e = NULL;
|
|
|
|
while ((end = strrchr(temp, '/'))) {
|
|
*end = '\0';
|
|
e = strmap_get_entry(dir_renames, temp);
|
|
if (e)
|
|
break;
|
|
}
|
|
free(temp);
|
|
return e;
|
|
}
|
|
|
|
static void compute_collisions(struct strmap *collisions,
|
|
struct strmap *dir_renames,
|
|
struct diff_queue_struct *pairs)
|
|
{
|
|
int i;
|
|
|
|
strmap_init_with_options(collisions, NULL, 0);
|
|
if (strmap_empty(dir_renames))
|
|
return;
|
|
|
|
/*
|
|
* Multiple files can be mapped to the same path due to directory
|
|
* renames done by the other side of history. Since that other
|
|
* side of history could have merged multiple directories into one,
|
|
* if our side of history added the same file basename to each of
|
|
* those directories, then all N of them would get implicitly
|
|
* renamed by the directory rename detection into the same path,
|
|
* and we'd get an add/add/.../add conflict, and all those adds
|
|
* from *this* side of history. This is not representable in the
|
|
* index, and users aren't going to easily be able to make sense of
|
|
* it. So we need to provide a good warning about what's
|
|
* happening, and fall back to no-directory-rename detection
|
|
* behavior for those paths.
|
|
*
|
|
* See testcases 9e and all of section 5 from t6043 for examples.
|
|
*/
|
|
for (i = 0; i < pairs->nr; ++i) {
|
|
struct strmap_entry *rename_info;
|
|
struct collision_info *collision_info;
|
|
char *new_path;
|
|
struct diff_filepair *pair = pairs->queue[i];
|
|
|
|
if (pair->status != 'A' && pair->status != 'R')
|
|
continue;
|
|
rename_info = check_dir_renamed(pair->two->path, dir_renames);
|
|
if (!rename_info)
|
|
continue;
|
|
|
|
new_path = apply_dir_rename(rename_info, pair->two->path);
|
|
assert(new_path);
|
|
collision_info = strmap_get(collisions, new_path);
|
|
if (collision_info) {
|
|
free(new_path);
|
|
} else {
|
|
CALLOC_ARRAY(collision_info, 1);
|
|
string_list_init(&collision_info->source_files, 0);
|
|
strmap_put(collisions, new_path, collision_info);
|
|
}
|
|
string_list_insert(&collision_info->source_files,
|
|
pair->two->path);
|
|
}
|
|
}
|
|
|
|
static char *check_for_directory_rename(struct merge_options *opt,
|
|
const char *path,
|
|
unsigned side_index,
|
|
struct strmap *dir_renames,
|
|
struct strmap *dir_rename_exclusions,
|
|
struct strmap *collisions,
|
|
int *clean_merge)
|
|
{
|
|
char *new_path = NULL;
|
|
struct strmap_entry *rename_info;
|
|
struct strmap_entry *otherinfo = NULL;
|
|
const char *new_dir;
|
|
|
|
if (strmap_empty(dir_renames))
|
|
return new_path;
|
|
rename_info = check_dir_renamed(path, dir_renames);
|
|
if (!rename_info)
|
|
return new_path;
|
|
/* old_dir = rename_info->key; */
|
|
new_dir = rename_info->value;
|
|
|
|
/*
|
|
* This next part is a little weird. We do not want to do an
|
|
* implicit rename into a directory we renamed on our side, because
|
|
* that will result in a spurious rename/rename(1to2) conflict. An
|
|
* example:
|
|
* Base commit: dumbdir/afile, otherdir/bfile
|
|
* Side 1: smrtdir/afile, otherdir/bfile
|
|
* Side 2: dumbdir/afile, dumbdir/bfile
|
|
* Here, while working on Side 1, we could notice that otherdir was
|
|
* renamed/merged to dumbdir, and change the diff_filepair for
|
|
* otherdir/bfile into a rename into dumbdir/bfile. However, Side
|
|
* 2 will notice the rename from dumbdir to smrtdir, and do the
|
|
* transitive rename to move it from dumbdir/bfile to
|
|
* smrtdir/bfile. That gives us bfile in dumbdir vs being in
|
|
* smrtdir, a rename/rename(1to2) conflict. We really just want
|
|
* the file to end up in smrtdir. And the way to achieve that is
|
|
* to not let Side1 do the rename to dumbdir, since we know that is
|
|
* the source of one of our directory renames.
|
|
*
|
|
* That's why otherinfo and dir_rename_exclusions is here.
|
|
*
|
|
* As it turns out, this also prevents N-way transient rename
|
|
* confusion; See testcases 9c and 9d of t6043.
|
|
*/
|
|
otherinfo = strmap_get_entry(dir_rename_exclusions, new_dir);
|
|
if (otherinfo) {
|
|
path_msg(opt, rename_info->key, 1,
|
|
_("WARNING: Avoiding applying %s -> %s rename "
|
|
"to %s, because %s itself was renamed."),
|
|
rename_info->key, new_dir, path, new_dir);
|
|
return NULL;
|
|
}
|
|
|
|
new_path = handle_path_level_conflicts(opt, path, side_index,
|
|
rename_info, collisions);
|
|
*clean_merge &= (new_path != NULL);
|
|
|
|
return new_path;
|
|
}
|
|
|
|
static void apply_directory_rename_modifications(struct merge_options *opt,
|
|
struct diff_filepair *pair,
|
|
char *new_path)
|
|
{
|
|
/*
|
|
* The basic idea is to get the conflict_info from opt->priv->paths
|
|
* at old path, and insert it into new_path; basically just this:
|
|
* ci = strmap_get(&opt->priv->paths, old_path);
|
|
* strmap_remove(&opt->priv->paths, old_path, 0);
|
|
* strmap_put(&opt->priv->paths, new_path, ci);
|
|
* However, there are some factors complicating this:
|
|
* - opt->priv->paths may already have an entry at new_path
|
|
* - Each ci tracks its containing directory, so we need to
|
|
* update that
|
|
* - If another ci has the same containing directory, then
|
|
* the two char*'s MUST point to the same location. See the
|
|
* comment in struct merged_info. strcmp equality is not
|
|
* enough; we need pointer equality.
|
|
* - opt->priv->paths must hold the parent directories of any
|
|
* entries that are added. So, if this directory rename
|
|
* causes entirely new directories, we must recursively add
|
|
* parent directories.
|
|
* - For each parent directory added to opt->priv->paths, we
|
|
* also need to get its parent directory stored in its
|
|
* conflict_info->merged.directory_name with all the same
|
|
* requirements about pointer equality.
|
|
*/
|
|
struct string_list dirs_to_insert = STRING_LIST_INIT_NODUP;
|
|
struct conflict_info *ci, *new_ci;
|
|
struct strmap_entry *entry;
|
|
const char *branch_with_new_path, *branch_with_dir_rename;
|
|
const char *old_path = pair->two->path;
|
|
const char *parent_name;
|
|
const char *cur_path;
|
|
int i, len;
|
|
|
|
entry = strmap_get_entry(&opt->priv->paths, old_path);
|
|
old_path = entry->key;
|
|
ci = entry->value;
|
|
VERIFY_CI(ci);
|
|
|
|
/* Find parent directories missing from opt->priv->paths */
|
|
cur_path = new_path;
|
|
while (1) {
|
|
/* Find the parent directory of cur_path */
|
|
char *last_slash = strrchr(cur_path, '/');
|
|
if (last_slash) {
|
|
parent_name = xstrndup(cur_path, last_slash - cur_path);
|
|
} else {
|
|
parent_name = opt->priv->toplevel_dir;
|
|
break;
|
|
}
|
|
|
|
/* Look it up in opt->priv->paths */
|
|
entry = strmap_get_entry(&opt->priv->paths, parent_name);
|
|
if (entry) {
|
|
free((char*)parent_name);
|
|
parent_name = entry->key; /* reuse known pointer */
|
|
break;
|
|
}
|
|
|
|
/* Record this is one of the directories we need to insert */
|
|
string_list_append(&dirs_to_insert, parent_name);
|
|
cur_path = parent_name;
|
|
}
|
|
|
|
/* Traverse dirs_to_insert and insert them into opt->priv->paths */
|
|
for (i = dirs_to_insert.nr-1; i >= 0; --i) {
|
|
struct conflict_info *dir_ci;
|
|
char *cur_dir = dirs_to_insert.items[i].string;
|
|
|
|
CALLOC_ARRAY(dir_ci, 1);
|
|
|
|
dir_ci->merged.directory_name = parent_name;
|
|
len = strlen(parent_name);
|
|
/* len+1 because of trailing '/' character */
|
|
dir_ci->merged.basename_offset = (len > 0 ? len+1 : len);
|
|
dir_ci->dirmask = ci->filemask;
|
|
strmap_put(&opt->priv->paths, cur_dir, dir_ci);
|
|
|
|
parent_name = cur_dir;
|
|
}
|
|
|
|
/*
|
|
* We are removing old_path from opt->priv->paths. old_path also will
|
|
* eventually need to be freed, but it may still be used by e.g.
|
|
* ci->pathnames. So, store it in another string-list for now.
|
|
*/
|
|
string_list_append(&opt->priv->paths_to_free, old_path);
|
|
|
|
assert(ci->filemask == 2 || ci->filemask == 4);
|
|
assert(ci->dirmask == 0);
|
|
strmap_remove(&opt->priv->paths, old_path, 0);
|
|
|
|
branch_with_new_path = (ci->filemask == 2) ? opt->branch1 : opt->branch2;
|
|
branch_with_dir_rename = (ci->filemask == 2) ? opt->branch2 : opt->branch1;
|
|
|
|
/* Now, finally update ci and stick it into opt->priv->paths */
|
|
ci->merged.directory_name = parent_name;
|
|
len = strlen(parent_name);
|
|
ci->merged.basename_offset = (len > 0 ? len+1 : len);
|
|
new_ci = strmap_get(&opt->priv->paths, new_path);
|
|
if (!new_ci) {
|
|
/* Place ci back into opt->priv->paths, but at new_path */
|
|
strmap_put(&opt->priv->paths, new_path, ci);
|
|
} else {
|
|
int index;
|
|
|
|
/* A few sanity checks */
|
|
VERIFY_CI(new_ci);
|
|
assert(ci->filemask == 2 || ci->filemask == 4);
|
|
assert((new_ci->filemask & ci->filemask) == 0);
|
|
assert(!new_ci->merged.clean);
|
|
|
|
/* Copy stuff from ci into new_ci */
|
|
new_ci->filemask |= ci->filemask;
|
|
if (new_ci->dirmask)
|
|
new_ci->df_conflict = 1;
|
|
index = (ci->filemask >> 1);
|
|
new_ci->pathnames[index] = ci->pathnames[index];
|
|
new_ci->stages[index].mode = ci->stages[index].mode;
|
|
oidcpy(&new_ci->stages[index].oid, &ci->stages[index].oid);
|
|
|
|
free(ci);
|
|
ci = new_ci;
|
|
}
|
|
|
|
if (opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_TRUE) {
|
|
/* Notify user of updated path */
|
|
if (pair->status == 'A')
|
|
path_msg(opt, new_path, 1,
|
|
_("Path updated: %s added in %s inside a "
|
|
"directory that was renamed in %s; moving "
|
|
"it to %s."),
|
|
old_path, branch_with_new_path,
|
|
branch_with_dir_rename, new_path);
|
|
else
|
|
path_msg(opt, new_path, 1,
|
|
_("Path updated: %s renamed to %s in %s, "
|
|
"inside a directory that was renamed in %s; "
|
|
"moving it to %s."),
|
|
pair->one->path, old_path, branch_with_new_path,
|
|
branch_with_dir_rename, new_path);
|
|
} else {
|
|
/*
|
|
* opt->detect_directory_renames has the value
|
|
* MERGE_DIRECTORY_RENAMES_CONFLICT, so mark these as conflicts.
|
|
*/
|
|
ci->path_conflict = 1;
|
|
if (pair->status == 'A')
|
|
path_msg(opt, new_path, 0,
|
|
_("CONFLICT (file location): %s added in %s "
|
|
"inside a directory that was renamed in %s, "
|
|
"suggesting it should perhaps be moved to "
|
|
"%s."),
|
|
old_path, branch_with_new_path,
|
|
branch_with_dir_rename, new_path);
|
|
else
|
|
path_msg(opt, new_path, 0,
|
|
_("CONFLICT (file location): %s renamed to %s "
|
|
"in %s, inside a directory that was renamed "
|
|
"in %s, suggesting it should perhaps be "
|
|
"moved to %s."),
|
|
pair->one->path, old_path, branch_with_new_path,
|
|
branch_with_dir_rename, new_path);
|
|
}
|
|
|
|
/*
|
|
* Finally, record the new location.
|
|
*/
|
|
pair->two->path = new_path;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to regular rename detection ***/
|
|
|
|
static int process_renames(struct merge_options *opt,
|
|
struct diff_queue_struct *renames)
|
|
{
|
|
int clean_merge = 1, i;
|
|
|
|
for (i = 0; i < renames->nr; ++i) {
|
|
const char *oldpath = NULL, *newpath;
|
|
struct diff_filepair *pair = renames->queue[i];
|
|
struct conflict_info *oldinfo = NULL, *newinfo = NULL;
|
|
struct strmap_entry *old_ent, *new_ent;
|
|
unsigned int old_sidemask;
|
|
int target_index, other_source_index;
|
|
int source_deleted, collision, type_changed;
|
|
const char *rename_branch = NULL, *delete_branch = NULL;
|
|
|
|
old_ent = strmap_get_entry(&opt->priv->paths, pair->one->path);
|
|
new_ent = strmap_get_entry(&opt->priv->paths, pair->two->path);
|
|
if (old_ent) {
|
|
oldpath = old_ent->key;
|
|
oldinfo = old_ent->value;
|
|
}
|
|
newpath = pair->two->path;
|
|
if (new_ent) {
|
|
newpath = new_ent->key;
|
|
newinfo = new_ent->value;
|
|
}
|
|
|
|
/*
|
|
* If pair->one->path isn't in opt->priv->paths, that means
|
|
* that either directory rename detection removed that
|
|
* path, or a parent directory of oldpath was resolved and
|
|
* we don't even need the rename; in either case, we can
|
|
* skip it. If oldinfo->merged.clean, then the other side
|
|
* of history had no changes to oldpath and we don't need
|
|
* the rename and can skip it.
|
|
*/
|
|
if (!oldinfo || oldinfo->merged.clean)
|
|
continue;
|
|
|
|
/*
|
|
* diff_filepairs have copies of pathnames, thus we have to
|
|
* use standard 'strcmp()' (negated) instead of '=='.
|
|
*/
|
|
if (i + 1 < renames->nr &&
|
|
!strcmp(oldpath, renames->queue[i+1]->one->path)) {
|
|
/* Handle rename/rename(1to2) or rename/rename(1to1) */
|
|
const char *pathnames[3];
|
|
struct version_info merged;
|
|
struct conflict_info *base, *side1, *side2;
|
|
unsigned was_binary_blob = 0;
|
|
|
|
pathnames[0] = oldpath;
|
|
pathnames[1] = newpath;
|
|
pathnames[2] = renames->queue[i+1]->two->path;
|
|
|
|
base = strmap_get(&opt->priv->paths, pathnames[0]);
|
|
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
|
|
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
|
|
|
|
VERIFY_CI(base);
|
|
VERIFY_CI(side1);
|
|
VERIFY_CI(side2);
|
|
|
|
if (!strcmp(pathnames[1], pathnames[2])) {
|
|
/* Both sides renamed the same way */
|
|
assert(side1 == side2);
|
|
memcpy(&side1->stages[0], &base->stages[0],
|
|
sizeof(merged));
|
|
side1->filemask |= (1 << MERGE_BASE);
|
|
/* Mark base as resolved by removal */
|
|
base->merged.is_null = 1;
|
|
base->merged.clean = 1;
|
|
|
|
/* We handled both renames, i.e. i+1 handled */
|
|
i++;
|
|
/* Move to next rename */
|
|
continue;
|
|
}
|
|
|
|
/* This is a rename/rename(1to2) */
|
|
clean_merge = handle_content_merge(opt,
|
|
pair->one->path,
|
|
&base->stages[0],
|
|
&side1->stages[1],
|
|
&side2->stages[2],
|
|
pathnames,
|
|
1 + 2 * opt->priv->call_depth,
|
|
&merged);
|
|
if (!clean_merge &&
|
|
merged.mode == side1->stages[1].mode &&
|
|
oideq(&merged.oid, &side1->stages[1].oid))
|
|
was_binary_blob = 1;
|
|
memcpy(&side1->stages[1], &merged, sizeof(merged));
|
|
if (was_binary_blob) {
|
|
/*
|
|
* Getting here means we were attempting to
|
|
* merge a binary blob.
|
|
*
|
|
* Since we can't merge binaries,
|
|
* handle_content_merge() just takes one
|
|
* side. But we don't want to copy the
|
|
* contents of one side to both paths. We
|
|
* used the contents of side1 above for
|
|
* side1->stages, let's use the contents of
|
|
* side2 for side2->stages below.
|
|
*/
|
|
oidcpy(&merged.oid, &side2->stages[2].oid);
|
|
merged.mode = side2->stages[2].mode;
|
|
}
|
|
memcpy(&side2->stages[2], &merged, sizeof(merged));
|
|
|
|
side1->path_conflict = 1;
|
|
side2->path_conflict = 1;
|
|
/*
|
|
* TODO: For renames we normally remove the path at the
|
|
* old name. It would thus seem consistent to do the
|
|
* same for rename/rename(1to2) cases, but we haven't
|
|
* done so traditionally and a number of the regression
|
|
* tests now encode an expectation that the file is
|
|
* left there at stage 1. If we ever decide to change
|
|
* this, add the following two lines here:
|
|
* base->merged.is_null = 1;
|
|
* base->merged.clean = 1;
|
|
* and remove the setting of base->path_conflict to 1.
|
|
*/
|
|
base->path_conflict = 1;
|
|
path_msg(opt, oldpath, 0,
|
|
_("CONFLICT (rename/rename): %s renamed to "
|
|
"%s in %s and to %s in %s."),
|
|
pathnames[0],
|
|
pathnames[1], opt->branch1,
|
|
pathnames[2], opt->branch2);
|
|
|
|
i++; /* We handled both renames, i.e. i+1 handled */
|
|
continue;
|
|
}
|
|
|
|
VERIFY_CI(oldinfo);
|
|
VERIFY_CI(newinfo);
|
|
target_index = pair->score; /* from collect_renames() */
|
|
assert(target_index == 1 || target_index == 2);
|
|
other_source_index = 3 - target_index;
|
|
old_sidemask = (1 << other_source_index); /* 2 or 4 */
|
|
source_deleted = (oldinfo->filemask == 1);
|
|
collision = ((newinfo->filemask & old_sidemask) != 0);
|
|
type_changed = !source_deleted &&
|
|
(S_ISREG(oldinfo->stages[other_source_index].mode) !=
|
|
S_ISREG(newinfo->stages[target_index].mode));
|
|
if (type_changed && collision) {
|
|
/*
|
|
* special handling so later blocks can handle this...
|
|
*
|
|
* if type_changed && collision are both true, then this
|
|
* was really a double rename, but one side wasn't
|
|
* detected due to lack of break detection. I.e.
|
|
* something like
|
|
* orig: has normal file 'foo'
|
|
* side1: renames 'foo' to 'bar', adds 'foo' symlink
|
|
* side2: renames 'foo' to 'bar'
|
|
* In this case, the foo->bar rename on side1 won't be
|
|
* detected because the new symlink named 'foo' is
|
|
* there and we don't do break detection. But we detect
|
|
* this here because we don't want to merge the content
|
|
* of the foo symlink with the foo->bar file, so we
|
|
* have some logic to handle this special case. The
|
|
* easiest way to do that is make 'bar' on side1 not
|
|
* be considered a colliding file but the other part
|
|
* of a normal rename. If the file is very different,
|
|
* well we're going to get content merge conflicts
|
|
* anyway so it doesn't hurt. And if the colliding
|
|
* file also has a different type, that'll be handled
|
|
* by the content merge logic in process_entry() too.
|
|
*
|
|
* See also t6430, 'rename vs. rename/symlink'
|
|
*/
|
|
collision = 0;
|
|
}
|
|
if (source_deleted) {
|
|
if (target_index == 1) {
|
|
rename_branch = opt->branch1;
|
|
delete_branch = opt->branch2;
|
|
} else {
|
|
rename_branch = opt->branch2;
|
|
delete_branch = opt->branch1;
|
|
}
|
|
}
|
|
|
|
assert(source_deleted || oldinfo->filemask & old_sidemask);
|
|
|
|
/* Need to check for special types of rename conflicts... */
|
|
if (collision && !source_deleted) {
|
|
/* collision: rename/add or rename/rename(2to1) */
|
|
const char *pathnames[3];
|
|
struct version_info merged;
|
|
|
|
struct conflict_info *base, *side1, *side2;
|
|
unsigned clean;
|
|
|
|
pathnames[0] = oldpath;
|
|
pathnames[other_source_index] = oldpath;
|
|
pathnames[target_index] = newpath;
|
|
|
|
base = strmap_get(&opt->priv->paths, pathnames[0]);
|
|
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
|
|
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
|
|
|
|
VERIFY_CI(base);
|
|
VERIFY_CI(side1);
|
|
VERIFY_CI(side2);
|
|
|
|
clean = handle_content_merge(opt, pair->one->path,
|
|
&base->stages[0],
|
|
&side1->stages[1],
|
|
&side2->stages[2],
|
|
pathnames,
|
|
1 + 2 * opt->priv->call_depth,
|
|
&merged);
|
|
|
|
memcpy(&newinfo->stages[target_index], &merged,
|
|
sizeof(merged));
|
|
if (!clean) {
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename involved in "
|
|
"collision): rename of %s -> %s has "
|
|
"content conflicts AND collides "
|
|
"with another path; this may result "
|
|
"in nested conflict markers."),
|
|
oldpath, newpath);
|
|
}
|
|
} else if (collision && source_deleted) {
|
|
/*
|
|
* rename/add/delete or rename/rename(2to1)/delete:
|
|
* since oldpath was deleted on the side that didn't
|
|
* do the rename, there's not much of a content merge
|
|
* we can do for the rename. oldinfo->merged.is_null
|
|
* was already set, so we just leave things as-is so
|
|
* they look like an add/add conflict.
|
|
*/
|
|
|
|
newinfo->path_conflict = 1;
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename/delete): %s renamed "
|
|
"to %s in %s, but deleted in %s."),
|
|
oldpath, newpath, rename_branch, delete_branch);
|
|
} else {
|
|
/*
|
|
* a few different cases...start by copying the
|
|
* existing stage(s) from oldinfo over the newinfo
|
|
* and update the pathname(s).
|
|
*/
|
|
memcpy(&newinfo->stages[0], &oldinfo->stages[0],
|
|
sizeof(newinfo->stages[0]));
|
|
newinfo->filemask |= (1 << MERGE_BASE);
|
|
newinfo->pathnames[0] = oldpath;
|
|
if (type_changed) {
|
|
/* rename vs. typechange */
|
|
/* Mark the original as resolved by removal */
|
|
memcpy(&oldinfo->stages[0].oid, null_oid(),
|
|
sizeof(oldinfo->stages[0].oid));
|
|
oldinfo->stages[0].mode = 0;
|
|
oldinfo->filemask &= 0x06;
|
|
} else if (source_deleted) {
|
|
/* rename/delete */
|
|
newinfo->path_conflict = 1;
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename/delete): %s renamed"
|
|
" to %s in %s, but deleted in %s."),
|
|
oldpath, newpath,
|
|
rename_branch, delete_branch);
|
|
} else {
|
|
/* normal rename */
|
|
memcpy(&newinfo->stages[other_source_index],
|
|
&oldinfo->stages[other_source_index],
|
|
sizeof(newinfo->stages[0]));
|
|
newinfo->filemask |= (1 << other_source_index);
|
|
newinfo->pathnames[other_source_index] = oldpath;
|
|
}
|
|
}
|
|
|
|
if (!type_changed) {
|
|
/* Mark the original as resolved by removal */
|
|
oldinfo->merged.is_null = 1;
|
|
oldinfo->merged.clean = 1;
|
|
}
|
|
|
|
}
|
|
|
|
return clean_merge;
|
|
}
|
|
|
|
static inline int possible_side_renames(struct rename_info *renames,
|
|
unsigned side_index)
|
|
{
|
|
return renames->pairs[side_index].nr > 0 &&
|
|
!strintmap_empty(&renames->relevant_sources[side_index]);
|
|
}
|
|
|
|
static inline int possible_renames(struct rename_info *renames)
|
|
{
|
|
return possible_side_renames(renames, 1) ||
|
|
possible_side_renames(renames, 2);
|
|
}
|
|
|
|
static void resolve_diffpair_statuses(struct diff_queue_struct *q)
|
|
{
|
|
/*
|
|
* A simplified version of diff_resolve_rename_copy(); would probably
|
|
* just use that function but it's static...
|
|
*/
|
|
int i;
|
|
struct diff_filepair *p;
|
|
|
|
for (i = 0; i < q->nr; ++i) {
|
|
p = q->queue[i];
|
|
p->status = 0; /* undecided */
|
|
if (!DIFF_FILE_VALID(p->one))
|
|
p->status = DIFF_STATUS_ADDED;
|
|
else if (!DIFF_FILE_VALID(p->two))
|
|
p->status = DIFF_STATUS_DELETED;
|
|
else if (DIFF_PAIR_RENAME(p))
|
|
p->status = DIFF_STATUS_RENAMED;
|
|
}
|
|
}
|
|
|
|
static int compare_pairs(const void *a_, const void *b_)
|
|
{
|
|
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
|
|
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
|
|
|
|
return strcmp(a->one->path, b->one->path);
|
|
}
|
|
|
|
/* Call diffcore_rename() to compute which files have changed on given side */
|
|
static void detect_regular_renames(struct merge_options *opt,
|
|
unsigned side_index)
|
|
{
|
|
struct diff_options diff_opts;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
if (!possible_side_renames(renames, side_index)) {
|
|
/*
|
|
* No rename detection needed for this side, but we still need
|
|
* to make sure 'adds' are marked correctly in case the other
|
|
* side had directory renames.
|
|
*/
|
|
resolve_diffpair_statuses(&renames->pairs[side_index]);
|
|
return;
|
|
}
|
|
|
|
repo_diff_setup(opt->repo, &diff_opts);
|
|
diff_opts.flags.recursive = 1;
|
|
diff_opts.flags.rename_empty = 0;
|
|
diff_opts.detect_rename = DIFF_DETECT_RENAME;
|
|
diff_opts.rename_limit = opt->rename_limit;
|
|
if (opt->rename_limit <= 0)
|
|
diff_opts.rename_limit = 1000;
|
|
diff_opts.rename_score = opt->rename_score;
|
|
diff_opts.show_rename_progress = opt->show_rename_progress;
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_setup_done(&diff_opts);
|
|
|
|
diff_queued_diff = renames->pairs[side_index];
|
|
trace2_region_enter("diff", "diffcore_rename", opt->repo);
|
|
diffcore_rename_extended(&diff_opts,
|
|
&renames->relevant_sources[side_index],
|
|
&renames->dirs_removed[side_index],
|
|
&renames->dir_rename_count[side_index]);
|
|
trace2_region_leave("diff", "diffcore_rename", opt->repo);
|
|
resolve_diffpair_statuses(&diff_queued_diff);
|
|
|
|
if (diff_opts.needed_rename_limit > renames->needed_limit)
|
|
renames->needed_limit = diff_opts.needed_rename_limit;
|
|
|
|
renames->pairs[side_index] = diff_queued_diff;
|
|
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_queued_diff.nr = 0;
|
|
diff_queued_diff.queue = NULL;
|
|
diff_flush(&diff_opts);
|
|
}
|
|
|
|
/*
|
|
* Get information of all renames which occurred in 'side_pairs', discarding
|
|
* non-renames.
|
|
*/
|
|
static int collect_renames(struct merge_options *opt,
|
|
struct diff_queue_struct *result,
|
|
unsigned side_index,
|
|
struct strmap *dir_renames_for_side,
|
|
struct strmap *rename_exclusions)
|
|
{
|
|
int i, clean = 1;
|
|
struct strmap collisions;
|
|
struct diff_queue_struct *side_pairs;
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
side_pairs = &renames->pairs[side_index];
|
|
compute_collisions(&collisions, dir_renames_for_side, side_pairs);
|
|
|
|
for (i = 0; i < side_pairs->nr; ++i) {
|
|
struct diff_filepair *p = side_pairs->queue[i];
|
|
char *new_path; /* non-NULL only with directory renames */
|
|
|
|
if (p->status != 'A' && p->status != 'R') {
|
|
diff_free_filepair(p);
|
|
continue;
|
|
}
|
|
|
|
new_path = check_for_directory_rename(opt, p->two->path,
|
|
side_index,
|
|
dir_renames_for_side,
|
|
rename_exclusions,
|
|
&collisions,
|
|
&clean);
|
|
|
|
if (p->status != 'R' && !new_path) {
|
|
diff_free_filepair(p);
|
|
continue;
|
|
}
|
|
|
|
if (new_path)
|
|
apply_directory_rename_modifications(opt, p, new_path);
|
|
|
|
/*
|
|
* p->score comes back from diffcore_rename_extended() with
|
|
* the similarity of the renamed file. The similarity is
|
|
* was used to determine that the two files were related
|
|
* and are a rename, which we have already used, but beyond
|
|
* that we have no use for the similarity. So p->score is
|
|
* now irrelevant. However, process_renames() will need to
|
|
* know which side of the merge this rename was associated
|
|
* with, so overwrite p->score with that value.
|
|
*/
|
|
p->score = side_index;
|
|
result->queue[result->nr++] = p;
|
|
}
|
|
|
|
/* Free each value in the collisions map */
|
|
strmap_for_each_entry(&collisions, &iter, entry) {
|
|
struct collision_info *info = entry->value;
|
|
string_list_clear(&info->source_files, 0);
|
|
}
|
|
/*
|
|
* In compute_collisions(), we set collisions.strdup_strings to 0
|
|
* so that we wouldn't have to make another copy of the new_path
|
|
* allocated by apply_dir_rename(). But now that we've used them
|
|
* and have no other references to these strings, it is time to
|
|
* deallocate them.
|
|
*/
|
|
free_strmap_strings(&collisions);
|
|
strmap_clear(&collisions, 1);
|
|
return clean;
|
|
}
|
|
|
|
static int detect_and_process_renames(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2)
|
|
{
|
|
struct diff_queue_struct combined;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
int need_dir_renames, s, clean = 1;
|
|
|
|
memset(&combined, 0, sizeof(combined));
|
|
if (!possible_renames(renames))
|
|
goto cleanup;
|
|
|
|
trace2_region_enter("merge", "regular renames", opt->repo);
|
|
detect_regular_renames(opt, MERGE_SIDE1);
|
|
detect_regular_renames(opt, MERGE_SIDE2);
|
|
trace2_region_leave("merge", "regular renames", opt->repo);
|
|
|
|
trace2_region_enter("merge", "directory renames", opt->repo);
|
|
need_dir_renames =
|
|
!opt->priv->call_depth &&
|
|
(opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_TRUE ||
|
|
opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_CONFLICT);
|
|
|
|
if (need_dir_renames) {
|
|
get_provisional_directory_renames(opt, MERGE_SIDE1, &clean);
|
|
get_provisional_directory_renames(opt, MERGE_SIDE2, &clean);
|
|
handle_directory_level_conflicts(opt);
|
|
}
|
|
|
|
ALLOC_GROW(combined.queue,
|
|
renames->pairs[1].nr + renames->pairs[2].nr,
|
|
combined.alloc);
|
|
clean &= collect_renames(opt, &combined, MERGE_SIDE1,
|
|
&renames->dir_renames[2],
|
|
&renames->dir_renames[1]);
|
|
clean &= collect_renames(opt, &combined, MERGE_SIDE2,
|
|
&renames->dir_renames[1],
|
|
&renames->dir_renames[2]);
|
|
STABLE_QSORT(combined.queue, combined.nr, compare_pairs);
|
|
trace2_region_leave("merge", "directory renames", opt->repo);
|
|
|
|
trace2_region_enter("merge", "process renames", opt->repo);
|
|
clean &= process_renames(opt, &combined);
|
|
trace2_region_leave("merge", "process renames", opt->repo);
|
|
|
|
goto simple_cleanup; /* collect_renames() handles some of cleanup */
|
|
|
|
cleanup:
|
|
/*
|
|
* Free now unneeded filepairs, which would have been handled
|
|
* in collect_renames() normally but we skipped that code.
|
|
*/
|
|
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
|
|
struct diff_queue_struct *side_pairs;
|
|
int i;
|
|
|
|
side_pairs = &renames->pairs[s];
|
|
for (i = 0; i < side_pairs->nr; ++i) {
|
|
struct diff_filepair *p = side_pairs->queue[i];
|
|
diff_free_filepair(p);
|
|
}
|
|
}
|
|
|
|
simple_cleanup:
|
|
/* Free memory for renames->pairs[] and combined */
|
|
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
|
|
free(renames->pairs[s].queue);
|
|
DIFF_QUEUE_CLEAR(&renames->pairs[s]);
|
|
}
|
|
if (combined.nr) {
|
|
int i;
|
|
for (i = 0; i < combined.nr; i++)
|
|
diff_free_filepair(combined.queue[i]);
|
|
free(combined.queue);
|
|
}
|
|
|
|
return clean;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to process_entries() ***/
|
|
|
|
static int string_list_df_name_compare(const char *one, const char *two)
|
|
{
|
|
int onelen = strlen(one);
|
|
int twolen = strlen(two);
|
|
/*
|
|
* Here we only care that entries for D/F conflicts are
|
|
* adjacent, in particular with the file of the D/F conflict
|
|
* appearing before files below the corresponding directory.
|
|
* The order of the rest of the list is irrelevant for us.
|
|
*
|
|
* To achieve this, we sort with df_name_compare and provide
|
|
* the mode S_IFDIR so that D/F conflicts will sort correctly.
|
|
* We use the mode S_IFDIR for everything else for simplicity,
|
|
* since in other cases any changes in their order due to
|
|
* sorting cause no problems for us.
|
|
*/
|
|
int cmp = df_name_compare(one, onelen, S_IFDIR,
|
|
two, twolen, S_IFDIR);
|
|
/*
|
|
* Now that 'foo' and 'foo/bar' compare equal, we have to make sure
|
|
* that 'foo' comes before 'foo/bar'.
|
|
*/
|
|
if (cmp)
|
|
return cmp;
|
|
return onelen - twolen;
|
|
}
|
|
|
|
static int read_oid_strbuf(struct merge_options *opt,
|
|
const struct object_id *oid,
|
|
struct strbuf *dst)
|
|
{
|
|
void *buf;
|
|
enum object_type type;
|
|
unsigned long size;
|
|
buf = read_object_file(oid, &type, &size);
|
|
if (!buf)
|
|
return err(opt, _("cannot read object %s"), oid_to_hex(oid));
|
|
if (type != OBJ_BLOB) {
|
|
free(buf);
|
|
return err(opt, _("object %s is not a blob"), oid_to_hex(oid));
|
|
}
|
|
strbuf_attach(dst, buf, size, size + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int blob_unchanged(struct merge_options *opt,
|
|
const struct version_info *base,
|
|
const struct version_info *side,
|
|
const char *path)
|
|
{
|
|
struct strbuf basebuf = STRBUF_INIT;
|
|
struct strbuf sidebuf = STRBUF_INIT;
|
|
int ret = 0; /* assume changed for safety */
|
|
struct index_state *idx = &opt->priv->attr_index;
|
|
|
|
if (!idx->initialized)
|
|
initialize_attr_index(opt);
|
|
|
|
if (base->mode != side->mode)
|
|
return 0;
|
|
if (oideq(&base->oid, &side->oid))
|
|
return 1;
|
|
|
|
if (read_oid_strbuf(opt, &base->oid, &basebuf) ||
|
|
read_oid_strbuf(opt, &side->oid, &sidebuf))
|
|
goto error_return;
|
|
/*
|
|
* Note: binary | is used so that both renormalizations are
|
|
* performed. Comparison can be skipped if both files are
|
|
* unchanged since their sha1s have already been compared.
|
|
*/
|
|
if (renormalize_buffer(idx, path, basebuf.buf, basebuf.len, &basebuf) |
|
|
renormalize_buffer(idx, path, sidebuf.buf, sidebuf.len, &sidebuf))
|
|
ret = (basebuf.len == sidebuf.len &&
|
|
!memcmp(basebuf.buf, sidebuf.buf, basebuf.len));
|
|
|
|
error_return:
|
|
strbuf_release(&basebuf);
|
|
strbuf_release(&sidebuf);
|
|
return ret;
|
|
}
|
|
|
|
struct directory_versions {
|
|
/*
|
|
* versions: list of (basename -> version_info)
|
|
*
|
|
* The basenames are in reverse lexicographic order of full pathnames,
|
|
* as processed in process_entries(). This puts all entries within
|
|
* a directory together, and covers the directory itself after
|
|
* everything within it, allowing us to write subtrees before needing
|
|
* to record information for the tree itself.
|
|
*/
|
|
struct string_list versions;
|
|
|
|
/*
|
|
* offsets: list of (full relative path directories -> integer offsets)
|
|
*
|
|
* Since versions contains basenames from files in multiple different
|
|
* directories, we need to know which entries in versions correspond
|
|
* to which directories. Values of e.g.
|
|
* "" 0
|
|
* src 2
|
|
* src/moduleA 5
|
|
* Would mean that entries 0-1 of versions are files in the toplevel
|
|
* directory, entries 2-4 are files under src/, and the remaining
|
|
* entries starting at index 5 are files under src/moduleA/.
|
|
*/
|
|
struct string_list offsets;
|
|
|
|
/*
|
|
* last_directory: directory that previously processed file found in
|
|
*
|
|
* last_directory starts NULL, but records the directory in which the
|
|
* previous file was found within. As soon as
|
|
* directory(current_file) != last_directory
|
|
* then we need to start updating accounting in versions & offsets.
|
|
* Note that last_directory is always the last path in "offsets" (or
|
|
* NULL if "offsets" is empty) so this exists just for quick access.
|
|
*/
|
|
const char *last_directory;
|
|
|
|
/* last_directory_len: cached computation of strlen(last_directory) */
|
|
unsigned last_directory_len;
|
|
};
|
|
|
|
static int tree_entry_order(const void *a_, const void *b_)
|
|
{
|
|
const struct string_list_item *a = a_;
|
|
const struct string_list_item *b = b_;
|
|
|
|
const struct merged_info *ami = a->util;
|
|
const struct merged_info *bmi = b->util;
|
|
return base_name_compare(a->string, strlen(a->string), ami->result.mode,
|
|
b->string, strlen(b->string), bmi->result.mode);
|
|
}
|
|
|
|
static void write_tree(struct object_id *result_oid,
|
|
struct string_list *versions,
|
|
unsigned int offset,
|
|
size_t hash_size)
|
|
{
|
|
size_t maxlen = 0, extra;
|
|
unsigned int nr;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int i;
|
|
|
|
assert(offset <= versions->nr);
|
|
nr = versions->nr - offset;
|
|
if (versions->nr)
|
|
/* No need for STABLE_QSORT -- filenames must be unique */
|
|
QSORT(versions->items + offset, nr, tree_entry_order);
|
|
|
|
/* Pre-allocate some space in buf */
|
|
extra = hash_size + 8; /* 8: 6 for mode, 1 for space, 1 for NUL char */
|
|
for (i = 0; i < nr; i++) {
|
|
maxlen += strlen(versions->items[offset+i].string) + extra;
|
|
}
|
|
strbuf_grow(&buf, maxlen);
|
|
|
|
/* Write each entry out to buf */
|
|
for (i = 0; i < nr; i++) {
|
|
struct merged_info *mi = versions->items[offset+i].util;
|
|
struct version_info *ri = &mi->result;
|
|
strbuf_addf(&buf, "%o %s%c",
|
|
ri->mode,
|
|
versions->items[offset+i].string, '\0');
|
|
strbuf_add(&buf, ri->oid.hash, hash_size);
|
|
}
|
|
|
|
/* Write this object file out, and record in result_oid */
|
|
write_object_file(buf.buf, buf.len, tree_type, result_oid);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static void record_entry_for_tree(struct directory_versions *dir_metadata,
|
|
const char *path,
|
|
struct merged_info *mi)
|
|
{
|
|
const char *basename;
|
|
|
|
if (mi->is_null)
|
|
/* nothing to record */
|
|
return;
|
|
|
|
basename = path + mi->basename_offset;
|
|
assert(strchr(basename, '/') == NULL);
|
|
string_list_append(&dir_metadata->versions,
|
|
basename)->util = &mi->result;
|
|
}
|
|
|
|
static void write_completed_directory(struct merge_options *opt,
|
|
const char *new_directory_name,
|
|
struct directory_versions *info)
|
|
{
|
|
const char *prev_dir;
|
|
struct merged_info *dir_info = NULL;
|
|
unsigned int offset;
|
|
|
|
/*
|
|
* Some explanation of info->versions and info->offsets...
|
|
*
|
|
* process_entries() iterates over all relevant files AND
|
|
* directories in reverse lexicographic order, and calls this
|
|
* function. Thus, an example of the paths that process_entries()
|
|
* could operate on (along with the directories for those paths
|
|
* being shown) is:
|
|
*
|
|
* xtract.c ""
|
|
* tokens.txt ""
|
|
* src/moduleB/umm.c src/moduleB
|
|
* src/moduleB/stuff.h src/moduleB
|
|
* src/moduleB/baz.c src/moduleB
|
|
* src/moduleB src
|
|
* src/moduleA/foo.c src/moduleA
|
|
* src/moduleA/bar.c src/moduleA
|
|
* src/moduleA src
|
|
* src ""
|
|
* Makefile ""
|
|
*
|
|
* info->versions:
|
|
*
|
|
* always contains the unprocessed entries and their
|
|
* version_info information. For example, after the first five
|
|
* entries above, info->versions would be:
|
|
*
|
|
* xtract.c <xtract.c's version_info>
|
|
* token.txt <token.txt's version_info>
|
|
* umm.c <src/moduleB/umm.c's version_info>
|
|
* stuff.h <src/moduleB/stuff.h's version_info>
|
|
* baz.c <src/moduleB/baz.c's version_info>
|
|
*
|
|
* Once a subdirectory is completed we remove the entries in
|
|
* that subdirectory from info->versions, writing it as a tree
|
|
* (write_tree()). Thus, as soon as we get to src/moduleB,
|
|
* info->versions would be updated to
|
|
*
|
|
* xtract.c <xtract.c's version_info>
|
|
* token.txt <token.txt's version_info>
|
|
* moduleB <src/moduleB's version_info>
|
|
*
|
|
* info->offsets:
|
|
*
|
|
* helps us track which entries in info->versions correspond to
|
|
* which directories. When we are N directories deep (e.g. 4
|
|
* for src/modA/submod/subdir/), we have up to N+1 unprocessed
|
|
* directories (+1 because of toplevel dir). Corresponding to
|
|
* the info->versions example above, after processing five entries
|
|
* info->offsets will be:
|
|
*
|
|
* "" 0
|
|
* src/moduleB 2
|
|
*
|
|
* which is used to know that xtract.c & token.txt are from the
|
|
* toplevel dirctory, while umm.c & stuff.h & baz.c are from the
|
|
* src/moduleB directory. Again, following the example above,
|
|
* once we need to process src/moduleB, then info->offsets is
|
|
* updated to
|
|
*
|
|
* "" 0
|
|
* src 2
|
|
*
|
|
* which says that moduleB (and only moduleB so far) is in the
|
|
* src directory.
|
|
*
|
|
* One unique thing to note about info->offsets here is that
|
|
* "src" was not added to info->offsets until there was a path
|
|
* (a file OR directory) immediately below src/ that got
|
|
* processed.
|
|
*
|
|
* Since process_entry() just appends new entries to info->versions,
|
|
* write_completed_directory() only needs to do work if the next path
|
|
* is in a directory that is different than the last directory found
|
|
* in info->offsets.
|
|
*/
|
|
|
|
/*
|
|
* If we are working with the same directory as the last entry, there
|
|
* is no work to do. (See comments above the directory_name member of
|
|
* struct merged_info for why we can use pointer comparison instead of
|
|
* strcmp here.)
|
|
*/
|
|
if (new_directory_name == info->last_directory)
|
|
return;
|
|
|
|
/*
|
|
* If we are just starting (last_directory is NULL), or last_directory
|
|
* is a prefix of the current directory, then we can just update
|
|
* info->offsets to record the offset where we started this directory
|
|
* and update last_directory to have quick access to it.
|
|
*/
|
|
if (info->last_directory == NULL ||
|
|
!strncmp(new_directory_name, info->last_directory,
|
|
info->last_directory_len)) {
|
|
uintptr_t offset = info->versions.nr;
|
|
|
|
info->last_directory = new_directory_name;
|
|
info->last_directory_len = strlen(info->last_directory);
|
|
/*
|
|
* Record the offset into info->versions where we will
|
|
* start recording basenames of paths found within
|
|
* new_directory_name.
|
|
*/
|
|
string_list_append(&info->offsets,
|
|
info->last_directory)->util = (void*)offset;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The next entry that will be processed will be within
|
|
* new_directory_name. Since at this point we know that
|
|
* new_directory_name is within a different directory than
|
|
* info->last_directory, we have all entries for info->last_directory
|
|
* in info->versions and we need to create a tree object for them.
|
|
*/
|
|
dir_info = strmap_get(&opt->priv->paths, info->last_directory);
|
|
assert(dir_info);
|
|
offset = (uintptr_t)info->offsets.items[info->offsets.nr-1].util;
|
|
if (offset == info->versions.nr) {
|
|
/*
|
|
* Actually, we don't need to create a tree object in this
|
|
* case. Whenever all files within a directory disappear
|
|
* during the merge (e.g. unmodified on one side and
|
|
* deleted on the other, or files were renamed elsewhere),
|
|
* then we get here and the directory itself needs to be
|
|
* omitted from its parent tree as well.
|
|
*/
|
|
dir_info->is_null = 1;
|
|
} else {
|
|
/*
|
|
* Write out the tree to the git object directory, and also
|
|
* record the mode and oid in dir_info->result.
|
|
*/
|
|
dir_info->is_null = 0;
|
|
dir_info->result.mode = S_IFDIR;
|
|
write_tree(&dir_info->result.oid, &info->versions, offset,
|
|
opt->repo->hash_algo->rawsz);
|
|
}
|
|
|
|
/*
|
|
* We've now used several entries from info->versions and one entry
|
|
* from info->offsets, so we get rid of those values.
|
|
*/
|
|
info->offsets.nr--;
|
|
info->versions.nr = offset;
|
|
|
|
/*
|
|
* Now we've taken care of the completed directory, but we need to
|
|
* prepare things since future entries will be in
|
|
* new_directory_name. (In particular, process_entry() will be
|
|
* appending new entries to info->versions.) So, we need to make
|
|
* sure new_directory_name is the last entry in info->offsets.
|
|
*/
|
|
prev_dir = info->offsets.nr == 0 ? NULL :
|
|
info->offsets.items[info->offsets.nr-1].string;
|
|
if (new_directory_name != prev_dir) {
|
|
uintptr_t c = info->versions.nr;
|
|
string_list_append(&info->offsets,
|
|
new_directory_name)->util = (void*)c;
|
|
}
|
|
|
|
/* And, of course, we need to update last_directory to match. */
|
|
info->last_directory = new_directory_name;
|
|
info->last_directory_len = strlen(info->last_directory);
|
|
}
|
|
|
|
/* Per entry merge function */
|
|
static void process_entry(struct merge_options *opt,
|
|
const char *path,
|
|
struct conflict_info *ci,
|
|
struct directory_versions *dir_metadata)
|
|
{
|
|
int df_file_index = 0;
|
|
|
|
VERIFY_CI(ci);
|
|
assert(ci->filemask >= 0 && ci->filemask <= 7);
|
|
/* ci->match_mask == 7 was handled in collect_merge_info_callback() */
|
|
assert(ci->match_mask == 0 || ci->match_mask == 3 ||
|
|
ci->match_mask == 5 || ci->match_mask == 6);
|
|
|
|
if (ci->dirmask) {
|
|
record_entry_for_tree(dir_metadata, path, &ci->merged);
|
|
if (ci->filemask == 0)
|
|
/* nothing else to handle */
|
|
return;
|
|
assert(ci->df_conflict);
|
|
}
|
|
|
|
if (ci->df_conflict && ci->merged.result.mode == 0) {
|
|
int i;
|
|
|
|
/*
|
|
* directory no longer in the way, but we do have a file we
|
|
* need to place here so we need to clean away the "directory
|
|
* merges to nothing" result.
|
|
*/
|
|
ci->df_conflict = 0;
|
|
assert(ci->filemask != 0);
|
|
ci->merged.clean = 0;
|
|
ci->merged.is_null = 0;
|
|
/* and we want to zero out any directory-related entries */
|
|
ci->match_mask = (ci->match_mask & ~ci->dirmask);
|
|
ci->dirmask = 0;
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
if (ci->filemask & (1 << i))
|
|
continue;
|
|
ci->stages[i].mode = 0;
|
|
oidcpy(&ci->stages[i].oid, null_oid());
|
|
}
|
|
} else if (ci->df_conflict && ci->merged.result.mode != 0) {
|
|
/*
|
|
* This started out as a D/F conflict, and the entries in
|
|
* the competing directory were not removed by the merge as
|
|
* evidenced by write_completed_directory() writing a value
|
|
* to ci->merged.result.mode.
|
|
*/
|
|
struct conflict_info *new_ci;
|
|
const char *branch;
|
|
const char *old_path = path;
|
|
int i;
|
|
|
|
assert(ci->merged.result.mode == S_IFDIR);
|
|
|
|
/*
|
|
* If filemask is 1, we can just ignore the file as having
|
|
* been deleted on both sides. We do not want to overwrite
|
|
* ci->merged.result, since it stores the tree for all the
|
|
* files under it.
|
|
*/
|
|
if (ci->filemask == 1) {
|
|
ci->filemask = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* This file still exists on at least one side, and we want
|
|
* the directory to remain here, so we need to move this
|
|
* path to some new location.
|
|
*/
|
|
CALLOC_ARRAY(new_ci, 1);
|
|
/* We don't really want new_ci->merged.result copied, but it'll
|
|
* be overwritten below so it doesn't matter. We also don't
|
|
* want any directory mode/oid values copied, but we'll zero
|
|
* those out immediately. We do want the rest of ci copied.
|
|
*/
|
|
memcpy(new_ci, ci, sizeof(*ci));
|
|
new_ci->match_mask = (new_ci->match_mask & ~new_ci->dirmask);
|
|
new_ci->dirmask = 0;
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
if (new_ci->filemask & (1 << i))
|
|
continue;
|
|
/* zero out any entries related to directories */
|
|
new_ci->stages[i].mode = 0;
|
|
oidcpy(&new_ci->stages[i].oid, null_oid());
|
|
}
|
|
|
|
/*
|
|
* Find out which side this file came from; note that we
|
|
* cannot just use ci->filemask, because renames could cause
|
|
* the filemask to go back to 7. So we use dirmask, then
|
|
* pick the opposite side's index.
|
|
*/
|
|
df_file_index = (ci->dirmask & (1 << 1)) ? 2 : 1;
|
|
branch = (df_file_index == 1) ? opt->branch1 : opt->branch2;
|
|
path = unique_path(&opt->priv->paths, path, branch);
|
|
strmap_put(&opt->priv->paths, path, new_ci);
|
|
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (file/directory): directory in the way "
|
|
"of %s from %s; moving it to %s instead."),
|
|
old_path, branch, path);
|
|
|
|
/*
|
|
* Zero out the filemask for the old ci. At this point, ci
|
|
* was just an entry for a directory, so we don't need to
|
|
* do anything more with it.
|
|
*/
|
|
ci->filemask = 0;
|
|
|
|
/*
|
|
* Now note that we're working on the new entry (path was
|
|
* updated above.
|
|
*/
|
|
ci = new_ci;
|
|
}
|
|
|
|
/*
|
|
* NOTE: Below there is a long switch-like if-elseif-elseif... block
|
|
* which the code goes through even for the df_conflict cases
|
|
* above.
|
|
*/
|
|
if (ci->match_mask) {
|
|
ci->merged.clean = !ci->df_conflict && !ci->path_conflict;
|
|
if (ci->match_mask == 6) {
|
|
/* stages[1] == stages[2] */
|
|
ci->merged.result.mode = ci->stages[1].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
|
|
} else {
|
|
/* determine the mask of the side that didn't match */
|
|
unsigned int othermask = 7 & ~ci->match_mask;
|
|
int side = (othermask == 4) ? 2 : 1;
|
|
|
|
ci->merged.result.mode = ci->stages[side].mode;
|
|
ci->merged.is_null = !ci->merged.result.mode;
|
|
if (ci->merged.is_null)
|
|
ci->merged.clean = 1;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
|
|
|
|
assert(othermask == 2 || othermask == 4);
|
|
assert(ci->merged.is_null ==
|
|
(ci->filemask == ci->match_mask));
|
|
}
|
|
} else if (ci->filemask >= 6 &&
|
|
(S_IFMT & ci->stages[1].mode) !=
|
|
(S_IFMT & ci->stages[2].mode)) {
|
|
/* Two different items from (file/submodule/symlink) */
|
|
if (opt->priv->call_depth) {
|
|
/* Just use the version from the merge base */
|
|
ci->merged.clean = 0;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[0].oid);
|
|
ci->merged.result.mode = ci->stages[0].mode;
|
|
ci->merged.is_null = (ci->merged.result.mode == 0);
|
|
} else {
|
|
/* Handle by renaming one or both to separate paths. */
|
|
unsigned o_mode = ci->stages[0].mode;
|
|
unsigned a_mode = ci->stages[1].mode;
|
|
unsigned b_mode = ci->stages[2].mode;
|
|
struct conflict_info *new_ci;
|
|
const char *a_path = NULL, *b_path = NULL;
|
|
int rename_a = 0, rename_b = 0;
|
|
|
|
new_ci = xmalloc(sizeof(*new_ci));
|
|
|
|
if (S_ISREG(a_mode))
|
|
rename_a = 1;
|
|
else if (S_ISREG(b_mode))
|
|
rename_b = 1;
|
|
else {
|
|
rename_a = 1;
|
|
rename_b = 1;
|
|
}
|
|
|
|
if (rename_a && rename_b) {
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (distinct types): %s had "
|
|
"different types on each side; "
|
|
"renamed both of them so each can "
|
|
"be recorded somewhere."),
|
|
path);
|
|
} else {
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (distinct types): %s had "
|
|
"different types on each side; "
|
|
"renamed one of them so each can be "
|
|
"recorded somewhere."),
|
|
path);
|
|
}
|
|
|
|
ci->merged.clean = 0;
|
|
memcpy(new_ci, ci, sizeof(*new_ci));
|
|
|
|
/* Put b into new_ci, removing a from stages */
|
|
new_ci->merged.result.mode = ci->stages[2].mode;
|
|
oidcpy(&new_ci->merged.result.oid, &ci->stages[2].oid);
|
|
new_ci->stages[1].mode = 0;
|
|
oidcpy(&new_ci->stages[1].oid, null_oid());
|
|
new_ci->filemask = 5;
|
|
if ((S_IFMT & b_mode) != (S_IFMT & o_mode)) {
|
|
new_ci->stages[0].mode = 0;
|
|
oidcpy(&new_ci->stages[0].oid, null_oid());
|
|
new_ci->filemask = 4;
|
|
}
|
|
|
|
/* Leave only a in ci, fixing stages. */
|
|
ci->merged.result.mode = ci->stages[1].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
|
|
ci->stages[2].mode = 0;
|
|
oidcpy(&ci->stages[2].oid, null_oid());
|
|
ci->filemask = 3;
|
|
if ((S_IFMT & a_mode) != (S_IFMT & o_mode)) {
|
|
ci->stages[0].mode = 0;
|
|
oidcpy(&ci->stages[0].oid, null_oid());
|
|
ci->filemask = 2;
|
|
}
|
|
|
|
/* Insert entries into opt->priv_paths */
|
|
assert(rename_a || rename_b);
|
|
if (rename_a) {
|
|
a_path = unique_path(&opt->priv->paths,
|
|
path, opt->branch1);
|
|
strmap_put(&opt->priv->paths, a_path, ci);
|
|
}
|
|
|
|
if (rename_b)
|
|
b_path = unique_path(&opt->priv->paths,
|
|
path, opt->branch2);
|
|
else
|
|
b_path = path;
|
|
strmap_put(&opt->priv->paths, b_path, new_ci);
|
|
|
|
if (rename_a && rename_b) {
|
|
strmap_remove(&opt->priv->paths, path, 0);
|
|
/*
|
|
* We removed path from opt->priv->paths. path
|
|
* will also eventually need to be freed, but
|
|
* it may still be used by e.g. ci->pathnames.
|
|
* So, store it in another string-list for now.
|
|
*/
|
|
string_list_append(&opt->priv->paths_to_free,
|
|
path);
|
|
}
|
|
|
|
/*
|
|
* Do special handling for b_path since process_entry()
|
|
* won't be called on it specially.
|
|
*/
|
|
strmap_put(&opt->priv->conflicted, b_path, new_ci);
|
|
record_entry_for_tree(dir_metadata, b_path,
|
|
&new_ci->merged);
|
|
|
|
/*
|
|
* Remaining code for processing this entry should
|
|
* think in terms of processing a_path.
|
|
*/
|
|
if (a_path)
|
|
path = a_path;
|
|
}
|
|
} else if (ci->filemask >= 6) {
|
|
/* Need a two-way or three-way content merge */
|
|
struct version_info merged_file;
|
|
unsigned clean_merge;
|
|
struct version_info *o = &ci->stages[0];
|
|
struct version_info *a = &ci->stages[1];
|
|
struct version_info *b = &ci->stages[2];
|
|
|
|
clean_merge = handle_content_merge(opt, path, o, a, b,
|
|
ci->pathnames,
|
|
opt->priv->call_depth * 2,
|
|
&merged_file);
|
|
ci->merged.clean = clean_merge &&
|
|
!ci->df_conflict && !ci->path_conflict;
|
|
ci->merged.result.mode = merged_file.mode;
|
|
ci->merged.is_null = (merged_file.mode == 0);
|
|
oidcpy(&ci->merged.result.oid, &merged_file.oid);
|
|
if (clean_merge && ci->df_conflict) {
|
|
assert(df_file_index == 1 || df_file_index == 2);
|
|
ci->filemask = 1 << df_file_index;
|
|
ci->stages[df_file_index].mode = merged_file.mode;
|
|
oidcpy(&ci->stages[df_file_index].oid, &merged_file.oid);
|
|
}
|
|
if (!clean_merge) {
|
|
const char *reason = _("content");
|
|
if (ci->filemask == 6)
|
|
reason = _("add/add");
|
|
if (S_ISGITLINK(merged_file.mode))
|
|
reason = _("submodule");
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (%s): Merge conflict in %s"),
|
|
reason, path);
|
|
}
|
|
} else if (ci->filemask == 3 || ci->filemask == 5) {
|
|
/* Modify/delete */
|
|
const char *modify_branch, *delete_branch;
|
|
int side = (ci->filemask == 5) ? 2 : 1;
|
|
int index = opt->priv->call_depth ? 0 : side;
|
|
|
|
ci->merged.result.mode = ci->stages[index].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[index].oid);
|
|
ci->merged.clean = 0;
|
|
|
|
modify_branch = (side == 1) ? opt->branch1 : opt->branch2;
|
|
delete_branch = (side == 1) ? opt->branch2 : opt->branch1;
|
|
|
|
if (opt->renormalize &&
|
|
blob_unchanged(opt, &ci->stages[0], &ci->stages[side],
|
|
path)) {
|
|
ci->merged.is_null = 1;
|
|
ci->merged.clean = 1;
|
|
assert(!ci->df_conflict && !ci->path_conflict);
|
|
} else if (ci->path_conflict &&
|
|
oideq(&ci->stages[0].oid, &ci->stages[side].oid)) {
|
|
/*
|
|
* This came from a rename/delete; no action to take,
|
|
* but avoid printing "modify/delete" conflict notice
|
|
* since the contents were not modified.
|
|
*/
|
|
} else {
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (modify/delete): %s deleted in %s "
|
|
"and modified in %s. Version %s of %s left "
|
|
"in tree."),
|
|
path, delete_branch, modify_branch,
|
|
modify_branch, path);
|
|
}
|
|
} else if (ci->filemask == 2 || ci->filemask == 4) {
|
|
/* Added on one side */
|
|
int side = (ci->filemask == 4) ? 2 : 1;
|
|
ci->merged.result.mode = ci->stages[side].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
|
|
ci->merged.clean = !ci->df_conflict && !ci->path_conflict;
|
|
} else if (ci->filemask == 1) {
|
|
/* Deleted on both sides */
|
|
ci->merged.is_null = 1;
|
|
ci->merged.result.mode = 0;
|
|
oidcpy(&ci->merged.result.oid, null_oid());
|
|
assert(!ci->df_conflict);
|
|
ci->merged.clean = !ci->path_conflict;
|
|
}
|
|
|
|
/*
|
|
* If still conflicted, record it separately. This allows us to later
|
|
* iterate over just conflicted entries when updating the index instead
|
|
* of iterating over all entries.
|
|
*/
|
|
if (!ci->merged.clean)
|
|
strmap_put(&opt->priv->conflicted, path, ci);
|
|
record_entry_for_tree(dir_metadata, path, &ci->merged);
|
|
}
|
|
|
|
static void process_entries(struct merge_options *opt,
|
|
struct object_id *result_oid)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
struct string_list plist = STRING_LIST_INIT_NODUP;
|
|
struct string_list_item *entry;
|
|
struct directory_versions dir_metadata = { STRING_LIST_INIT_NODUP,
|
|
STRING_LIST_INIT_NODUP,
|
|
NULL, 0 };
|
|
|
|
trace2_region_enter("merge", "process_entries setup", opt->repo);
|
|
if (strmap_empty(&opt->priv->paths)) {
|
|
oidcpy(result_oid, opt->repo->hash_algo->empty_tree);
|
|
return;
|
|
}
|
|
|
|
/* Hack to pre-allocate plist to the desired size */
|
|
trace2_region_enter("merge", "plist grow", opt->repo);
|
|
ALLOC_GROW(plist.items, strmap_get_size(&opt->priv->paths), plist.alloc);
|
|
trace2_region_leave("merge", "plist grow", opt->repo);
|
|
|
|
/* Put every entry from paths into plist, then sort */
|
|
trace2_region_enter("merge", "plist copy", opt->repo);
|
|
strmap_for_each_entry(&opt->priv->paths, &iter, e) {
|
|
string_list_append(&plist, e->key)->util = e->value;
|
|
}
|
|
trace2_region_leave("merge", "plist copy", opt->repo);
|
|
|
|
trace2_region_enter("merge", "plist special sort", opt->repo);
|
|
plist.cmp = string_list_df_name_compare;
|
|
string_list_sort(&plist);
|
|
trace2_region_leave("merge", "plist special sort", opt->repo);
|
|
|
|
trace2_region_leave("merge", "process_entries setup", opt->repo);
|
|
|
|
/*
|
|
* Iterate over the items in reverse order, so we can handle paths
|
|
* below a directory before needing to handle the directory itself.
|
|
*
|
|
* This allows us to write subtrees before we need to write trees,
|
|
* and it also enables sane handling of directory/file conflicts
|
|
* (because it allows us to know whether the directory is still in
|
|
* the way when it is time to process the file at the same path).
|
|
*/
|
|
trace2_region_enter("merge", "processing", opt->repo);
|
|
for (entry = &plist.items[plist.nr-1]; entry >= plist.items; --entry) {
|
|
char *path = entry->string;
|
|
/*
|
|
* NOTE: mi may actually be a pointer to a conflict_info, but
|
|
* we have to check mi->clean first to see if it's safe to
|
|
* reassign to such a pointer type.
|
|
*/
|
|
struct merged_info *mi = entry->util;
|
|
|
|
write_completed_directory(opt, mi->directory_name,
|
|
&dir_metadata);
|
|
if (mi->clean)
|
|
record_entry_for_tree(&dir_metadata, path, mi);
|
|
else {
|
|
struct conflict_info *ci = (struct conflict_info *)mi;
|
|
process_entry(opt, path, ci, &dir_metadata);
|
|
}
|
|
}
|
|
trace2_region_leave("merge", "processing", opt->repo);
|
|
|
|
trace2_region_enter("merge", "process_entries cleanup", opt->repo);
|
|
if (dir_metadata.offsets.nr != 1 ||
|
|
(uintptr_t)dir_metadata.offsets.items[0].util != 0) {
|
|
printf("dir_metadata.offsets.nr = %d (should be 1)\n",
|
|
dir_metadata.offsets.nr);
|
|
printf("dir_metadata.offsets.items[0].util = %u (should be 0)\n",
|
|
(unsigned)(uintptr_t)dir_metadata.offsets.items[0].util);
|
|
fflush(stdout);
|
|
BUG("dir_metadata accounting completely off; shouldn't happen");
|
|
}
|
|
write_tree(result_oid, &dir_metadata.versions, 0,
|
|
opt->repo->hash_algo->rawsz);
|
|
string_list_clear(&plist, 0);
|
|
string_list_clear(&dir_metadata.versions, 0);
|
|
string_list_clear(&dir_metadata.offsets, 0);
|
|
trace2_region_leave("merge", "process_entries cleanup", opt->repo);
|
|
}
|
|
|
|
/*** Function Grouping: functions related to merge_switch_to_result() ***/
|
|
|
|
static int checkout(struct merge_options *opt,
|
|
struct tree *prev,
|
|
struct tree *next)
|
|
{
|
|
/* Switch the index/working copy from old to new */
|
|
int ret;
|
|
struct tree_desc trees[2];
|
|
struct unpack_trees_options unpack_opts;
|
|
|
|
memset(&unpack_opts, 0, sizeof(unpack_opts));
|
|
unpack_opts.head_idx = -1;
|
|
unpack_opts.src_index = opt->repo->index;
|
|
unpack_opts.dst_index = opt->repo->index;
|
|
|
|
setup_unpack_trees_porcelain(&unpack_opts, "merge");
|
|
|
|
/*
|
|
* NOTE: if this were just "git checkout" code, we would probably
|
|
* read or refresh the cache and check for a conflicted index, but
|
|
* builtin/merge.c or sequencer.c really needs to read the index
|
|
* and check for conflicted entries before starting merging for a
|
|
* good user experience (no sense waiting for merges/rebases before
|
|
* erroring out), so there's no reason to duplicate that work here.
|
|
*/
|
|
|
|
/* 2-way merge to the new branch */
|
|
unpack_opts.update = 1;
|
|
unpack_opts.merge = 1;
|
|
unpack_opts.quiet = 0; /* FIXME: sequencer might want quiet? */
|
|
unpack_opts.verbose_update = (opt->verbosity > 2);
|
|
unpack_opts.fn = twoway_merge;
|
|
if (1/* FIXME: opts->overwrite_ignore*/) {
|
|
CALLOC_ARRAY(unpack_opts.dir, 1);
|
|
unpack_opts.dir->flags |= DIR_SHOW_IGNORED;
|
|
setup_standard_excludes(unpack_opts.dir);
|
|
}
|
|
parse_tree(prev);
|
|
init_tree_desc(&trees[0], prev->buffer, prev->size);
|
|
parse_tree(next);
|
|
init_tree_desc(&trees[1], next->buffer, next->size);
|
|
|
|
ret = unpack_trees(2, trees, &unpack_opts);
|
|
clear_unpack_trees_porcelain(&unpack_opts);
|
|
dir_clear(unpack_opts.dir);
|
|
FREE_AND_NULL(unpack_opts.dir);
|
|
return ret;
|
|
}
|
|
|
|
static int record_conflicted_index_entries(struct merge_options *opt)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
struct index_state *index = opt->repo->index;
|
|
struct checkout state = CHECKOUT_INIT;
|
|
int errs = 0;
|
|
int original_cache_nr;
|
|
|
|
if (strmap_empty(&opt->priv->conflicted))
|
|
return 0;
|
|
|
|
/* If any entries have skip_worktree set, we'll have to check 'em out */
|
|
state.force = 1;
|
|
state.quiet = 1;
|
|
state.refresh_cache = 1;
|
|
state.istate = index;
|
|
original_cache_nr = index->cache_nr;
|
|
|
|
/* Put every entry from paths into plist, then sort */
|
|
strmap_for_each_entry(&opt->priv->conflicted, &iter, e) {
|
|
const char *path = e->key;
|
|
struct conflict_info *ci = e->value;
|
|
int pos;
|
|
struct cache_entry *ce;
|
|
int i;
|
|
|
|
VERIFY_CI(ci);
|
|
|
|
/*
|
|
* The index will already have a stage=0 entry for this path,
|
|
* because we created an as-merged-as-possible version of the
|
|
* file and checkout() moved the working copy and index over
|
|
* to that version.
|
|
*
|
|
* However, previous iterations through this loop will have
|
|
* added unstaged entries to the end of the cache which
|
|
* ignore the standard alphabetical ordering of cache
|
|
* entries and break invariants needed for index_name_pos()
|
|
* to work. However, we know the entry we want is before
|
|
* those appended cache entries, so do a temporary swap on
|
|
* cache_nr to only look through entries of interest.
|
|
*/
|
|
SWAP(index->cache_nr, original_cache_nr);
|
|
pos = index_name_pos(index, path, strlen(path));
|
|
SWAP(index->cache_nr, original_cache_nr);
|
|
if (pos < 0) {
|
|
if (ci->filemask != 1)
|
|
BUG("Conflicted %s but nothing in basic working tree or index; this shouldn't happen", path);
|
|
cache_tree_invalidate_path(index, path);
|
|
} else {
|
|
ce = index->cache[pos];
|
|
|
|
/*
|
|
* Clean paths with CE_SKIP_WORKTREE set will not be
|
|
* written to the working tree by the unpack_trees()
|
|
* call in checkout(). Our conflicted entries would
|
|
* have appeared clean to that code since we ignored
|
|
* the higher order stages. Thus, we need override
|
|
* the CE_SKIP_WORKTREE bit and manually write those
|
|
* files to the working disk here.
|
|
*/
|
|
if (ce_skip_worktree(ce)) {
|
|
struct stat st;
|
|
|
|
if (!lstat(path, &st)) {
|
|
char *new_name = unique_path(&opt->priv->paths,
|
|
path,
|
|
"cruft");
|
|
|
|
path_msg(opt, path, 1,
|
|
_("Note: %s not up to date and in way of checking out conflicted version; old copy renamed to %s"),
|
|
path, new_name);
|
|
errs |= rename(path, new_name);
|
|
free(new_name);
|
|
}
|
|
errs |= checkout_entry(ce, &state, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Mark this cache entry for removal and instead add
|
|
* new stage>0 entries corresponding to the
|
|
* conflicts. If there are many conflicted entries, we
|
|
* want to avoid memmove'ing O(NM) entries by
|
|
* inserting the new entries one at a time. So,
|
|
* instead, we just add the new cache entries to the
|
|
* end (ignoring normal index requirements on sort
|
|
* order) and sort the index once we're all done.
|
|
*/
|
|
ce->ce_flags |= CE_REMOVE;
|
|
}
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
struct version_info *vi;
|
|
if (!(ci->filemask & (1ul << i)))
|
|
continue;
|
|
vi = &ci->stages[i];
|
|
ce = make_cache_entry(index, vi->mode, &vi->oid,
|
|
path, i+1, 0);
|
|
add_index_entry(index, ce, ADD_CACHE_JUST_APPEND);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove the unused cache entries (and invalidate the relevant
|
|
* cache-trees), then sort the index entries to get the conflicted
|
|
* entries we added to the end into their right locations.
|
|
*/
|
|
remove_marked_cache_entries(index, 1);
|
|
/*
|
|
* No need for STABLE_QSORT -- cmp_cache_name_compare sorts primarily
|
|
* on filename and secondarily on stage, and (name, stage #) are a
|
|
* unique tuple.
|
|
*/
|
|
QSORT(index->cache, index->cache_nr, cmp_cache_name_compare);
|
|
|
|
return errs;
|
|
}
|
|
|
|
void merge_switch_to_result(struct merge_options *opt,
|
|
struct tree *head,
|
|
struct merge_result *result,
|
|
int update_worktree_and_index,
|
|
int display_update_msgs)
|
|
{
|
|
assert(opt->priv == NULL);
|
|
if (result->clean >= 0 && update_worktree_and_index) {
|
|
const char *filename;
|
|
FILE *fp;
|
|
|
|
trace2_region_enter("merge", "checkout", opt->repo);
|
|
if (checkout(opt, head, result->tree)) {
|
|
/* failure to function */
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
trace2_region_leave("merge", "checkout", opt->repo);
|
|
|
|
trace2_region_enter("merge", "record_conflicted", opt->repo);
|
|
opt->priv = result->priv;
|
|
if (record_conflicted_index_entries(opt)) {
|
|
/* failure to function */
|
|
opt->priv = NULL;
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
opt->priv = NULL;
|
|
trace2_region_leave("merge", "record_conflicted", opt->repo);
|
|
|
|
trace2_region_enter("merge", "write_auto_merge", opt->repo);
|
|
filename = git_path_auto_merge(opt->repo);
|
|
fp = xfopen(filename, "w");
|
|
fprintf(fp, "%s\n", oid_to_hex(&result->tree->object.oid));
|
|
fclose(fp);
|
|
trace2_region_leave("merge", "write_auto_merge", opt->repo);
|
|
}
|
|
|
|
if (display_update_msgs) {
|
|
struct merge_options_internal *opti = result->priv;
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
struct string_list olist = STRING_LIST_INIT_NODUP;
|
|
int i;
|
|
|
|
trace2_region_enter("merge", "display messages", opt->repo);
|
|
|
|
/* Hack to pre-allocate olist to the desired size */
|
|
ALLOC_GROW(olist.items, strmap_get_size(&opti->output),
|
|
olist.alloc);
|
|
|
|
/* Put every entry from output into olist, then sort */
|
|
strmap_for_each_entry(&opti->output, &iter, e) {
|
|
string_list_append(&olist, e->key)->util = e->value;
|
|
}
|
|
string_list_sort(&olist);
|
|
|
|
/* Iterate over the items, printing them */
|
|
for (i = 0; i < olist.nr; ++i) {
|
|
struct strbuf *sb = olist.items[i].util;
|
|
|
|
printf("%s", sb->buf);
|
|
}
|
|
string_list_clear(&olist, 0);
|
|
|
|
/* Also include needed rename limit adjustment now */
|
|
diff_warn_rename_limit("merge.renamelimit",
|
|
opti->renames.needed_limit, 0);
|
|
|
|
trace2_region_leave("merge", "display messages", opt->repo);
|
|
}
|
|
|
|
merge_finalize(opt, result);
|
|
}
|
|
|
|
void merge_finalize(struct merge_options *opt,
|
|
struct merge_result *result)
|
|
{
|
|
struct merge_options_internal *opti = result->priv;
|
|
|
|
if (opt->renormalize)
|
|
git_attr_set_direction(GIT_ATTR_CHECKIN);
|
|
assert(opt->priv == NULL);
|
|
|
|
clear_or_reinit_internal_opts(opti, 0);
|
|
FREE_AND_NULL(opti);
|
|
}
|
|
|
|
/*** Function Grouping: helper functions for merge_incore_*() ***/
|
|
|
|
static struct tree *shift_tree_object(struct repository *repo,
|
|
struct tree *one, struct tree *two,
|
|
const char *subtree_shift)
|
|
{
|
|
struct object_id shifted;
|
|
|
|
if (!*subtree_shift) {
|
|
shift_tree(repo, &one->object.oid, &two->object.oid, &shifted, 0);
|
|
} else {
|
|
shift_tree_by(repo, &one->object.oid, &two->object.oid, &shifted,
|
|
subtree_shift);
|
|
}
|
|
if (oideq(&two->object.oid, &shifted))
|
|
return two;
|
|
return lookup_tree(repo, &shifted);
|
|
}
|
|
|
|
static inline void set_commit_tree(struct commit *c, struct tree *t)
|
|
{
|
|
c->maybe_tree = t;
|
|
}
|
|
|
|
static struct commit *make_virtual_commit(struct repository *repo,
|
|
struct tree *tree,
|
|
const char *comment)
|
|
{
|
|
struct commit *commit = alloc_commit_node(repo);
|
|
|
|
set_merge_remote_desc(commit, comment, (struct object *)commit);
|
|
set_commit_tree(commit, tree);
|
|
commit->object.parsed = 1;
|
|
return commit;
|
|
}
|
|
|
|
static void merge_start(struct merge_options *opt, struct merge_result *result)
|
|
{
|
|
struct rename_info *renames;
|
|
int i;
|
|
|
|
/* Sanity checks on opt */
|
|
trace2_region_enter("merge", "sanity checks", opt->repo);
|
|
assert(opt->repo);
|
|
|
|
assert(opt->branch1 && opt->branch2);
|
|
|
|
assert(opt->detect_directory_renames >= MERGE_DIRECTORY_RENAMES_NONE &&
|
|
opt->detect_directory_renames <= MERGE_DIRECTORY_RENAMES_TRUE);
|
|
assert(opt->rename_limit >= -1);
|
|
assert(opt->rename_score >= 0 && opt->rename_score <= MAX_SCORE);
|
|
assert(opt->show_rename_progress >= 0 && opt->show_rename_progress <= 1);
|
|
|
|
assert(opt->xdl_opts >= 0);
|
|
assert(opt->recursive_variant >= MERGE_VARIANT_NORMAL &&
|
|
opt->recursive_variant <= MERGE_VARIANT_THEIRS);
|
|
|
|
/*
|
|
* detect_renames, verbosity, buffer_output, and obuf are ignored
|
|
* fields that were used by "recursive" rather than "ort" -- but
|
|
* sanity check them anyway.
|
|
*/
|
|
assert(opt->detect_renames >= -1 &&
|
|
opt->detect_renames <= DIFF_DETECT_COPY);
|
|
assert(opt->verbosity >= 0 && opt->verbosity <= 5);
|
|
assert(opt->buffer_output <= 2);
|
|
assert(opt->obuf.len == 0);
|
|
|
|
assert(opt->priv == NULL);
|
|
if (result->priv) {
|
|
opt->priv = result->priv;
|
|
result->priv = NULL;
|
|
/*
|
|
* opt->priv non-NULL means we had results from a previous
|
|
* run; do a few sanity checks that user didn't mess with
|
|
* it in an obvious fashion.
|
|
*/
|
|
assert(opt->priv->call_depth == 0);
|
|
assert(!opt->priv->toplevel_dir ||
|
|
0 == strlen(opt->priv->toplevel_dir));
|
|
}
|
|
trace2_region_leave("merge", "sanity checks", opt->repo);
|
|
|
|
/* Default to histogram diff. Actually, just hardcode it...for now. */
|
|
opt->xdl_opts = DIFF_WITH_ALG(opt, HISTOGRAM_DIFF);
|
|
|
|
/* Handle attr direction stuff for renormalization */
|
|
if (opt->renormalize)
|
|
git_attr_set_direction(GIT_ATTR_CHECKOUT);
|
|
|
|
/* Initialization of opt->priv, our internal merge data */
|
|
trace2_region_enter("merge", "allocate/init", opt->repo);
|
|
if (opt->priv) {
|
|
clear_or_reinit_internal_opts(opt->priv, 1);
|
|
trace2_region_leave("merge", "allocate/init", opt->repo);
|
|
return;
|
|
}
|
|
opt->priv = xcalloc(1, sizeof(*opt->priv));
|
|
|
|
/* Initialization of various renames fields */
|
|
renames = &opt->priv->renames;
|
|
for (i = MERGE_SIDE1; i <= MERGE_SIDE2; i++) {
|
|
strintmap_init_with_options(&renames->dirs_removed[i],
|
|
NOT_RELEVANT, NULL, 0);
|
|
strmap_init_with_options(&renames->dir_rename_count[i],
|
|
NULL, 1);
|
|
strmap_init_with_options(&renames->dir_renames[i],
|
|
NULL, 0);
|
|
strintmap_init_with_options(&renames->relevant_sources[i],
|
|
0, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* Although we initialize opt->priv->paths with strdup_strings=0,
|
|
* that's just to avoid making yet another copy of an allocated
|
|
* string. Putting the entry into paths means we are taking
|
|
* ownership, so we will later free it. paths_to_free is similar.
|
|
*
|
|
* In contrast, conflicted just has a subset of keys from paths, so
|
|
* we don't want to free those (it'd be a duplicate free).
|
|
*/
|
|
strmap_init_with_options(&opt->priv->paths, NULL, 0);
|
|
strmap_init_with_options(&opt->priv->conflicted, NULL, 0);
|
|
string_list_init(&opt->priv->paths_to_free, 0);
|
|
|
|
/*
|
|
* keys & strbufs in output will sometimes need to outlive "paths",
|
|
* so it will have a copy of relevant keys. It's probably a small
|
|
* subset of the overall paths that have special output.
|
|
*/
|
|
strmap_init(&opt->priv->output);
|
|
|
|
trace2_region_leave("merge", "allocate/init", opt->repo);
|
|
}
|
|
|
|
/*** Function Grouping: merge_incore_*() and their internal variants ***/
|
|
|
|
/*
|
|
* Originally from merge_trees_internal(); heavily adapted, though.
|
|
*/
|
|
static void merge_ort_nonrecursive_internal(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2,
|
|
struct merge_result *result)
|
|
{
|
|
struct object_id working_tree_oid;
|
|
|
|
if (opt->subtree_shift) {
|
|
side2 = shift_tree_object(opt->repo, side1, side2,
|
|
opt->subtree_shift);
|
|
merge_base = shift_tree_object(opt->repo, side1, merge_base,
|
|
opt->subtree_shift);
|
|
}
|
|
|
|
trace2_region_enter("merge", "collect_merge_info", opt->repo);
|
|
if (collect_merge_info(opt, merge_base, side1, side2) != 0) {
|
|
/*
|
|
* TRANSLATORS: The %s arguments are: 1) tree hash of a merge
|
|
* base, and 2-3) the trees for the two trees we're merging.
|
|
*/
|
|
err(opt, _("collecting merge info failed for trees %s, %s, %s"),
|
|
oid_to_hex(&merge_base->object.oid),
|
|
oid_to_hex(&side1->object.oid),
|
|
oid_to_hex(&side2->object.oid));
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
trace2_region_leave("merge", "collect_merge_info", opt->repo);
|
|
|
|
trace2_region_enter("merge", "renames", opt->repo);
|
|
result->clean = detect_and_process_renames(opt, merge_base,
|
|
side1, side2);
|
|
trace2_region_leave("merge", "renames", opt->repo);
|
|
|
|
trace2_region_enter("merge", "process_entries", opt->repo);
|
|
process_entries(opt, &working_tree_oid);
|
|
trace2_region_leave("merge", "process_entries", opt->repo);
|
|
|
|
/* Set return values */
|
|
result->tree = parse_tree_indirect(&working_tree_oid);
|
|
/* existence of conflicted entries implies unclean */
|
|
result->clean &= strmap_empty(&opt->priv->conflicted);
|
|
if (!opt->priv->call_depth) {
|
|
result->priv = opt->priv;
|
|
opt->priv = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Originally from merge_recursive_internal(); somewhat adapted, though.
|
|
*/
|
|
static void merge_ort_internal(struct merge_options *opt,
|
|
struct commit_list *merge_bases,
|
|
struct commit *h1,
|
|
struct commit *h2,
|
|
struct merge_result *result)
|
|
{
|
|
struct commit_list *iter;
|
|
struct commit *merged_merge_bases;
|
|
const char *ancestor_name;
|
|
struct strbuf merge_base_abbrev = STRBUF_INIT;
|
|
|
|
if (!merge_bases) {
|
|
merge_bases = get_merge_bases(h1, h2);
|
|
/* See merge-ort.h:merge_incore_recursive() declaration NOTE */
|
|
merge_bases = reverse_commit_list(merge_bases);
|
|
}
|
|
|
|
merged_merge_bases = pop_commit(&merge_bases);
|
|
if (merged_merge_bases == NULL) {
|
|
/* if there is no common ancestor, use an empty tree */
|
|
struct tree *tree;
|
|
|
|
tree = lookup_tree(opt->repo, opt->repo->hash_algo->empty_tree);
|
|
merged_merge_bases = make_virtual_commit(opt->repo, tree,
|
|
"ancestor");
|
|
ancestor_name = "empty tree";
|
|
} else if (merge_bases) {
|
|
ancestor_name = "merged common ancestors";
|
|
} else {
|
|
strbuf_add_unique_abbrev(&merge_base_abbrev,
|
|
&merged_merge_bases->object.oid,
|
|
DEFAULT_ABBREV);
|
|
ancestor_name = merge_base_abbrev.buf;
|
|
}
|
|
|
|
for (iter = merge_bases; iter; iter = iter->next) {
|
|
const char *saved_b1, *saved_b2;
|
|
struct commit *prev = merged_merge_bases;
|
|
|
|
opt->priv->call_depth++;
|
|
/*
|
|
* When the merge fails, the result contains files
|
|
* with conflict markers. The cleanness flag is
|
|
* ignored (unless indicating an error), it was never
|
|
* actually used, as result of merge_trees has always
|
|
* overwritten it: the committed "conflicts" were
|
|
* already resolved.
|
|
*/
|
|
saved_b1 = opt->branch1;
|
|
saved_b2 = opt->branch2;
|
|
opt->branch1 = "Temporary merge branch 1";
|
|
opt->branch2 = "Temporary merge branch 2";
|
|
merge_ort_internal(opt, NULL, prev, iter->item, result);
|
|
if (result->clean < 0)
|
|
return;
|
|
opt->branch1 = saved_b1;
|
|
opt->branch2 = saved_b2;
|
|
opt->priv->call_depth--;
|
|
|
|
merged_merge_bases = make_virtual_commit(opt->repo,
|
|
result->tree,
|
|
"merged tree");
|
|
commit_list_insert(prev, &merged_merge_bases->parents);
|
|
commit_list_insert(iter->item,
|
|
&merged_merge_bases->parents->next);
|
|
|
|
clear_or_reinit_internal_opts(opt->priv, 1);
|
|
}
|
|
|
|
opt->ancestor = ancestor_name;
|
|
merge_ort_nonrecursive_internal(opt,
|
|
repo_get_commit_tree(opt->repo,
|
|
merged_merge_bases),
|
|
repo_get_commit_tree(opt->repo, h1),
|
|
repo_get_commit_tree(opt->repo, h2),
|
|
result);
|
|
strbuf_release(&merge_base_abbrev);
|
|
opt->ancestor = NULL; /* avoid accidental re-use of opt->ancestor */
|
|
}
|
|
|
|
void merge_incore_nonrecursive(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2,
|
|
struct merge_result *result)
|
|
{
|
|
trace2_region_enter("merge", "incore_nonrecursive", opt->repo);
|
|
|
|
trace2_region_enter("merge", "merge_start", opt->repo);
|
|
assert(opt->ancestor != NULL);
|
|
merge_start(opt, result);
|
|
trace2_region_leave("merge", "merge_start", opt->repo);
|
|
|
|
merge_ort_nonrecursive_internal(opt, merge_base, side1, side2, result);
|
|
trace2_region_leave("merge", "incore_nonrecursive", opt->repo);
|
|
}
|
|
|
|
void merge_incore_recursive(struct merge_options *opt,
|
|
struct commit_list *merge_bases,
|
|
struct commit *side1,
|
|
struct commit *side2,
|
|
struct merge_result *result)
|
|
{
|
|
trace2_region_enter("merge", "incore_recursive", opt->repo);
|
|
|
|
/* We set the ancestor label based on the merge_bases */
|
|
assert(opt->ancestor == NULL);
|
|
|
|
trace2_region_enter("merge", "merge_start", opt->repo);
|
|
merge_start(opt, result);
|
|
trace2_region_leave("merge", "merge_start", opt->repo);
|
|
|
|
merge_ort_internal(opt, merge_bases, side1, side2, result);
|
|
trace2_region_leave("merge", "incore_recursive", opt->repo);
|
|
}
|