зеркало из https://github.com/microsoft/git.git
Merge branch 'as/dir-c-cleanup'
Refactor and generally clean up the directory traversal API implementation. * as/dir-c-cleanup: dir.c: rename free_excludes() to clear_exclude_list() dir.c: refactor is_path_excluded() dir.c: refactor is_excluded() dir.c: refactor is_excluded_from_list() dir.c: rename excluded() to is_excluded() dir.c: rename excluded_from_list() to is_excluded_from_list() dir.c: rename path_excluded() to is_path_excluded() dir.c: rename cryptic 'which' variable to more consistent name Improve documentation and comments regarding directory traversal API api-directory-listing.txt: update to match code
This commit is contained in:
Junio C Hamano
Коммит
d912b0e44f
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@ -9,37 +9,40 @@ Data structure
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--------------
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`struct dir_struct` structure is used to pass directory traversal
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options to the library and to record the paths discovered. The notable
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options are:
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options to the library and to record the paths discovered. A single
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`struct dir_struct` is used regardless of whether or not the traversal
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recursively descends into subdirectories.
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The notable options are:
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`exclude_per_dir`::
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The name of the file to be read in each directory for excluded
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files (typically `.gitignore`).
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`collect_ignored`::
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`flags`::
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Include paths that are to be excluded in the result.
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A bit-field of options:
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`show_ignored`::
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`DIR_SHOW_IGNORED`:::
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The traversal is for finding just ignored files, not unignored
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files.
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`show_other_directories`::
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`DIR_SHOW_OTHER_DIRECTORIES`:::
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Include a directory that is not tracked.
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`hide_empty_directories`::
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`DIR_HIDE_EMPTY_DIRECTORIES`:::
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Do not include a directory that is not tracked and is empty.
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`no_gitlinks`::
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`DIR_NO_GITLINKS`:::
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If set, recurse into a directory that looks like a git
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directory. Otherwise it is shown as a directory.
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The result of the enumeration is left in these fields::
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The result of the enumeration is left in these fields:
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`entries[]`::
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2
attr.c
2
attr.c
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@ -284,7 +284,7 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
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* (reading the file from top to bottom), .gitattribute of the root
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* directory (again, reading the file from top to bottom) down to the
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* current directory, and then scan the list backwards to find the first match.
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* This is exactly the same as what excluded() does in dir.c to deal with
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* This is exactly the same as what is_excluded() does in dir.c to deal with
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* .gitignore
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*/
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@ -454,7 +454,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
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&& !file_exists(pathspec[i])) {
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if (ignore_missing) {
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int dtype = DT_UNKNOWN;
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if (path_excluded(&check, pathspec[i], -1, &dtype))
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if (is_path_excluded(&check, pathspec[i], -1, &dtype))
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dir_add_ignored(&dir, pathspec[i], strlen(pathspec[i]));
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} else
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die(_("pathspec '%s' did not match any files"),
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@ -203,7 +203,7 @@ static void show_ru_info(void)
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static int ce_excluded(struct path_exclude_check *check, struct cache_entry *ce)
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{
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int dtype = ce_to_dtype(ce);
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return path_excluded(check, ce->name, ce_namelen(ce), &dtype);
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return is_path_excluded(check, ce->name, ce_namelen(ce), &dtype);
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}
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static void show_files(struct dir_struct *dir)
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149
dir.c
149
dir.c
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@ -2,6 +2,8 @@
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* This handles recursive filename detection with exclude
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* files, index knowledge etc..
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*
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* See Documentation/technical/api-directory-listing.txt
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*
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* Copyright (C) Linus Torvalds, 2005-2006
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* Junio Hamano, 2005-2006
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*/
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@ -377,7 +379,7 @@ void parse_exclude_pattern(const char **pattern,
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}
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void add_exclude(const char *string, const char *base,
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int baselen, struct exclude_list *which)
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int baselen, struct exclude_list *el)
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{
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struct exclude *x;
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int patternlen;
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@ -401,8 +403,8 @@ void add_exclude(const char *string, const char *base,
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x->base = base;
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x->baselen = baselen;
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x->flags = flags;
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ALLOC_GROW(which->excludes, which->nr + 1, which->alloc);
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which->excludes[which->nr++] = x;
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ALLOC_GROW(el->excludes, el->nr + 1, el->alloc);
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el->excludes[el->nr++] = x;
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}
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static void *read_skip_worktree_file_from_index(const char *path, size_t *size)
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@ -428,7 +430,11 @@ static void *read_skip_worktree_file_from_index(const char *path, size_t *size)
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return data;
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}
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void free_excludes(struct exclude_list *el)
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/*
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* Frees memory within el which was allocated for exclude patterns and
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* the file buffer. Does not free el itself.
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*/
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void clear_exclude_list(struct exclude_list *el)
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{
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int i;
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@ -444,7 +450,7 @@ int add_excludes_from_file_to_list(const char *fname,
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const char *base,
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int baselen,
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char **buf_p,
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struct exclude_list *which,
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struct exclude_list *el,
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int check_index)
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{
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struct stat st;
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@ -493,7 +499,7 @@ int add_excludes_from_file_to_list(const char *fname,
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if (buf[i] == '\n') {
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if (entry != buf + i && entry[0] != '#') {
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buf[i - (i && buf[i-1] == '\r')] = 0;
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add_exclude(entry, base, baselen, which);
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add_exclude(entry, base, baselen, el);
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}
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entry = buf + i + 1;
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}
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@ -508,6 +514,10 @@ void add_excludes_from_file(struct dir_struct *dir, const char *fname)
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die("cannot use %s as an exclude file", fname);
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}
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/*
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* Loads the per-directory exclude list for the substring of base
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* which has a char length of baselen.
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*/
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static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
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{
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struct exclude_list *el;
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@ -518,7 +528,7 @@ static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
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(baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
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return; /* too long a path -- ignore */
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/* Pop the ones that are not the prefix of the path being checked. */
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/* Pop the directories that are not the prefix of the path being checked. */
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el = &dir->exclude_list[EXC_DIRS];
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while ((stk = dir->exclude_stack) != NULL) {
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if (stk->baselen <= baselen &&
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@ -629,22 +639,26 @@ int match_pathname(const char *pathname, int pathlen,
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ignore_case ? FNM_CASEFOLD : 0) == 0;
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}
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/* Scan the list and let the last match determine the fate.
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* Return 1 for exclude, 0 for include and -1 for undecided.
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/*
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* Scan the given exclude list in reverse to see whether pathname
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* should be ignored. The first match (i.e. the last on the list), if
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* any, determines the fate. Returns the exclude_list element which
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* matched, or NULL for undecided.
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*/
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int excluded_from_list(const char *pathname,
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int pathlen, const char *basename, int *dtype,
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struct exclude_list *el)
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static struct exclude *last_exclude_matching_from_list(const char *pathname,
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int pathlen,
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const char *basename,
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int *dtype,
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struct exclude_list *el)
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{
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int i;
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if (!el->nr)
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return -1; /* undefined */
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return NULL; /* undefined */
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for (i = el->nr - 1; 0 <= i; i--) {
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struct exclude *x = el->excludes[i];
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const char *exclude = x->pattern;
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int to_exclude = x->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
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int prefix = x->nowildcardlen;
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if (x->flags & EXC_FLAG_MUSTBEDIR) {
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@ -659,7 +673,7 @@ int excluded_from_list(const char *pathname,
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pathlen - (basename - pathname),
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exclude, prefix, x->patternlen,
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x->flags))
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return to_exclude;
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return x;
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continue;
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}
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@ -667,28 +681,64 @@ int excluded_from_list(const char *pathname,
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if (match_pathname(pathname, pathlen,
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x->base, x->baselen ? x->baselen - 1 : 0,
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exclude, prefix, x->patternlen, x->flags))
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return to_exclude;
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return x;
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}
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return NULL; /* undecided */
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}
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/*
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* Scan the list and let the last match determine the fate.
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* Return 1 for exclude, 0 for include and -1 for undecided.
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*/
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int is_excluded_from_list(const char *pathname,
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int pathlen, const char *basename, int *dtype,
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struct exclude_list *el)
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{
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struct exclude *exclude;
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exclude = last_exclude_matching_from_list(pathname, pathlen, basename, dtype, el);
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if (exclude)
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return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
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return -1; /* undecided */
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}
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static int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
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/*
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* Loads the exclude lists for the directory containing pathname, then
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* scans all exclude lists to determine whether pathname is excluded.
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* Returns the exclude_list element which matched, or NULL for
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* undecided.
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*/
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static struct exclude *last_exclude_matching(struct dir_struct *dir,
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const char *pathname,
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int *dtype_p)
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{
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int pathlen = strlen(pathname);
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int st;
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struct exclude *exclude;
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const char *basename = strrchr(pathname, '/');
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basename = (basename) ? basename+1 : pathname;
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prep_exclude(dir, pathname, basename-pathname);
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for (st = EXC_CMDL; st <= EXC_FILE; st++) {
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switch (excluded_from_list(pathname, pathlen, basename,
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dtype_p, &dir->exclude_list[st])) {
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case 0:
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return 0;
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case 1:
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return 1;
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}
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exclude = last_exclude_matching_from_list(
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pathname, pathlen, basename, dtype_p,
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&dir->exclude_list[st]);
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if (exclude)
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return exclude;
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}
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return NULL;
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}
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/*
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* Loads the exclude lists for the directory containing pathname, then
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* scans all exclude lists to determine whether pathname is excluded.
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* Returns 1 if true, otherwise 0.
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*/
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static int is_excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
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{
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struct exclude *exclude =
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last_exclude_matching(dir, pathname, dtype_p);
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if (exclude)
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return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
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return 0;
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}
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|
|
@ -696,6 +746,7 @@ void path_exclude_check_init(struct path_exclude_check *check,
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struct dir_struct *dir)
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{
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check->dir = dir;
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check->exclude = NULL;
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strbuf_init(&check->path, 256);
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}
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|
@ -705,32 +756,41 @@ void path_exclude_check_clear(struct path_exclude_check *check)
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}
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|
||||
/*
|
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* Is this name excluded? This is for a caller like show_files() that
|
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* do not honor directory hierarchy and iterate through paths that are
|
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* possibly in an ignored directory.
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* For each subdirectory in name, starting with the top-most, checks
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* to see if that subdirectory is excluded, and if so, returns the
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* corresponding exclude structure. Otherwise, checks whether name
|
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* itself (which is presumably a file) is excluded.
|
||||
*
|
||||
* A path to a directory known to be excluded is left in check->path to
|
||||
* optimize for repeated checks for files in the same excluded directory.
|
||||
*/
|
||||
int path_excluded(struct path_exclude_check *check,
|
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const char *name, int namelen, int *dtype)
|
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struct exclude *last_exclude_matching_path(struct path_exclude_check *check,
|
||||
const char *name, int namelen,
|
||||
int *dtype)
|
||||
{
|
||||
int i;
|
||||
struct strbuf *path = &check->path;
|
||||
struct exclude *exclude;
|
||||
|
||||
/*
|
||||
* we allow the caller to pass namelen as an optimization; it
|
||||
* must match the length of the name, as we eventually call
|
||||
* excluded() on the whole name string.
|
||||
* is_excluded() on the whole name string.
|
||||
*/
|
||||
if (namelen < 0)
|
||||
namelen = strlen(name);
|
||||
|
||||
/*
|
||||
* If path is non-empty, and name is equal to path or a
|
||||
* subdirectory of path, name should be excluded, because
|
||||
* it's inside a directory which is already known to be
|
||||
* excluded and was previously left in check->path.
|
||||
*/
|
||||
if (path->len &&
|
||||
path->len <= namelen &&
|
||||
!memcmp(name, path->buf, path->len) &&
|
||||
(!name[path->len] || name[path->len] == '/'))
|
||||
return 1;
|
||||
return check->exclude;
|
||||
|
||||
strbuf_setlen(path, 0);
|
||||
for (i = 0; name[i]; i++) {
|
||||
|
|
@ -738,8 +798,12 @@ int path_excluded(struct path_exclude_check *check,
|
|||
|
||||
if (ch == '/') {
|
||||
int dt = DT_DIR;
|
||||
if (excluded(check->dir, path->buf, &dt))
|
||||
return 1;
|
||||
exclude = last_exclude_matching(check->dir,
|
||||
path->buf, &dt);
|
||||
if (exclude) {
|
||||
check->exclude = exclude;
|
||||
return exclude;
|
||||
}
|
||||
}
|
||||
strbuf_addch(path, ch);
|
||||
}
|
||||
|
|
@ -747,7 +811,22 @@ int path_excluded(struct path_exclude_check *check,
|
|||
/* An entry in the index; cannot be a directory with subentries */
|
||||
strbuf_setlen(path, 0);
|
||||
|
||||
return excluded(check->dir, name, dtype);
|
||||
return last_exclude_matching(check->dir, name, dtype);
|
||||
}
|
||||
|
||||
/*
|
||||
* Is this name excluded? This is for a caller like show_files() that
|
||||
* do not honor directory hierarchy and iterate through paths that are
|
||||
* possibly in an ignored directory.
|
||||
*/
|
||||
int is_path_excluded(struct path_exclude_check *check,
|
||||
const char *name, int namelen, int *dtype)
|
||||
{
|
||||
struct exclude *exclude =
|
||||
last_exclude_matching_path(check, name, namelen, dtype);
|
||||
if (exclude)
|
||||
return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct dir_entry *dir_entry_new(const char *pathname, int len)
|
||||
|
|
@ -1047,7 +1126,7 @@ static enum path_treatment treat_one_path(struct dir_struct *dir,
|
|||
const struct path_simplify *simplify,
|
||||
int dtype, struct dirent *de)
|
||||
{
|
||||
int exclude = excluded(dir, path->buf, &dtype);
|
||||
int exclude = is_excluded(dir, path->buf, &dtype);
|
||||
if (exclude && (dir->flags & DIR_COLLECT_IGNORED)
|
||||
&& exclude_matches_pathspec(path->buf, path->len, simplify))
|
||||
dir_add_ignored(dir, path->buf, path->len);
|
||||
|
|
|
|||
45
dir.h
45
dir.h
|
|
@ -1,6 +1,8 @@
|
|||
#ifndef DIR_H
|
||||
#define DIR_H
|
||||
|
||||
/* See Documentation/technical/api-directory-listing.txt */
|
||||
|
||||
#include "strbuf.h"
|
||||
|
||||
struct dir_entry {
|
||||
|
|
@ -13,6 +15,12 @@ struct dir_entry {
|
|||
#define EXC_FLAG_MUSTBEDIR 8
|
||||
#define EXC_FLAG_NEGATIVE 16
|
||||
|
||||
/*
|
||||
* Each .gitignore file will be parsed into patterns which are then
|
||||
* appended to the relevant exclude_list (either EXC_DIRS or
|
||||
* EXC_FILE). exclude_lists are also used to represent the list of
|
||||
* --exclude values passed via CLI args (EXC_CMDL).
|
||||
*/
|
||||
struct exclude_list {
|
||||
int nr;
|
||||
int alloc;
|
||||
|
|
@ -26,9 +34,15 @@ struct exclude_list {
|
|||
} **excludes;
|
||||
};
|
||||
|
||||
/*
|
||||
* The contents of the per-directory exclude files are lazily read on
|
||||
* demand and then cached in memory, one per exclude_stack struct, in
|
||||
* order to avoid opening and parsing each one every time that
|
||||
* directory is traversed.
|
||||
*/
|
||||
struct exclude_stack {
|
||||
struct exclude_stack *prev;
|
||||
char *filebuf;
|
||||
struct exclude_stack *prev; /* the struct exclude_stack for the parent directory */
|
||||
char *filebuf; /* remember pointer to per-directory exclude file contents so we can free() */
|
||||
int baselen;
|
||||
int exclude_ix;
|
||||
};
|
||||
|
|
@ -59,6 +73,14 @@ struct dir_struct {
|
|||
#define EXC_DIRS 1
|
||||
#define EXC_FILE 2
|
||||
|
||||
/*
|
||||
* Temporary variables which are used during loading of the
|
||||
* per-directory exclude lists.
|
||||
*
|
||||
* exclude_stack points to the top of the exclude_stack, and
|
||||
* basebuf contains the full path to the current
|
||||
* (sub)directory in the traversal.
|
||||
*/
|
||||
struct exclude_stack *exclude_stack;
|
||||
char basebuf[PATH_MAX];
|
||||
};
|
||||
|
|
@ -76,8 +98,8 @@ extern int within_depth(const char *name, int namelen, int depth, int max_depth)
|
|||
extern int fill_directory(struct dir_struct *dir, const char **pathspec);
|
||||
extern int read_directory(struct dir_struct *, const char *path, int len, const char **pathspec);
|
||||
|
||||
extern int excluded_from_list(const char *pathname, int pathlen, const char *basename,
|
||||
int *dtype, struct exclude_list *el);
|
||||
extern int is_excluded_from_list(const char *pathname, int pathlen, const char *basename,
|
||||
int *dtype, struct exclude_list *el);
|
||||
struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len);
|
||||
|
||||
/*
|
||||
|
|
@ -91,26 +113,29 @@ extern int match_pathname(const char *, int,
|
|||
const char *, int, int, int);
|
||||
|
||||
/*
|
||||
* The excluded() API is meant for callers that check each level of leading
|
||||
* directory hierarchies with excluded() to avoid recursing into excluded
|
||||
* The is_excluded() API is meant for callers that check each level of leading
|
||||
* directory hierarchies with is_excluded() to avoid recursing into excluded
|
||||
* directories. Callers that do not do so should use this API instead.
|
||||
*/
|
||||
struct path_exclude_check {
|
||||
struct dir_struct *dir;
|
||||
struct exclude *exclude;
|
||||
struct strbuf path;
|
||||
};
|
||||
extern void path_exclude_check_init(struct path_exclude_check *, struct dir_struct *);
|
||||
extern void path_exclude_check_clear(struct path_exclude_check *);
|
||||
extern int path_excluded(struct path_exclude_check *, const char *, int namelen, int *dtype);
|
||||
extern struct exclude *last_exclude_matching_path(struct path_exclude_check *, const char *,
|
||||
int namelen, int *dtype);
|
||||
extern int is_path_excluded(struct path_exclude_check *, const char *, int namelen, int *dtype);
|
||||
|
||||
|
||||
extern int add_excludes_from_file_to_list(const char *fname, const char *base, int baselen,
|
||||
char **buf_p, struct exclude_list *which, int check_index);
|
||||
char **buf_p, struct exclude_list *el, int check_index);
|
||||
extern void add_excludes_from_file(struct dir_struct *, const char *fname);
|
||||
extern void parse_exclude_pattern(const char **string, int *patternlen, int *flags, int *nowildcardlen);
|
||||
extern void add_exclude(const char *string, const char *base,
|
||||
int baselen, struct exclude_list *which);
|
||||
extern void free_excludes(struct exclude_list *el);
|
||||
int baselen, struct exclude_list *el);
|
||||
extern void clear_exclude_list(struct exclude_list *el);
|
||||
extern int file_exists(const char *);
|
||||
|
||||
extern int is_inside_dir(const char *dir);
|
||||
|
|
|
|||
|
|
@ -837,7 +837,8 @@ static int clear_ce_flags_dir(struct cache_entry **cache, int nr,
|
|||
{
|
||||
struct cache_entry **cache_end;
|
||||
int dtype = DT_DIR;
|
||||
int ret = excluded_from_list(prefix, prefix_len, basename, &dtype, el);
|
||||
int ret = is_excluded_from_list(prefix, prefix_len,
|
||||
basename, &dtype, el);
|
||||
|
||||
prefix[prefix_len++] = '/';
|
||||
|
||||
|
|
@ -856,7 +857,7 @@ static int clear_ce_flags_dir(struct cache_entry **cache, int nr,
|
|||
* with ret (iow, we know in advance the incl/excl
|
||||
* decision for the entire directory), clear flag here without
|
||||
* calling clear_ce_flags_1(). That function will call
|
||||
* the expensive excluded_from_list() on every entry.
|
||||
* the expensive is_excluded_from_list() on every entry.
|
||||
*/
|
||||
return clear_ce_flags_1(cache, cache_end - cache,
|
||||
prefix, prefix_len,
|
||||
|
|
@ -939,7 +940,8 @@ static int clear_ce_flags_1(struct cache_entry **cache, int nr,
|
|||
|
||||
/* Non-directory */
|
||||
dtype = ce_to_dtype(ce);
|
||||
ret = excluded_from_list(ce->name, ce_namelen(ce), name, &dtype, el);
|
||||
ret = is_excluded_from_list(ce->name, ce_namelen(ce),
|
||||
name, &dtype, el);
|
||||
if (ret < 0)
|
||||
ret = defval;
|
||||
if (ret > 0)
|
||||
|
|
@ -1152,7 +1154,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
|
|||
*o->dst_index = o->result;
|
||||
|
||||
done:
|
||||
free_excludes(&el);
|
||||
clear_exclude_list(&el);
|
||||
if (o->path_exclude_check) {
|
||||
path_exclude_check_clear(o->path_exclude_check);
|
||||
free(o->path_exclude_check);
|
||||
|
|
@ -1373,7 +1375,7 @@ static int check_ok_to_remove(const char *name, int len, int dtype,
|
|||
return 0;
|
||||
|
||||
if (o->dir &&
|
||||
path_excluded(o->path_exclude_check, name, -1, &dtype))
|
||||
is_path_excluded(o->path_exclude_check, name, -1, &dtype))
|
||||
/*
|
||||
* ce->name is explicitly excluded, so it is Ok to
|
||||
* overwrite it.
|
||||
|
|
|
|||
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