Граф коммитов

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Автор SHA1 Сообщение Дата
Junio C Hamano 0fea6b73f1 Merge branch 'tb/multi-pack-verbatim-reuse'
Streaming spans of packfile data used to be done only from a
single, primary, pack in a repository with multiple packfiles.  It
has been extended to allow reuse from other packfiles, too.

* tb/multi-pack-verbatim-reuse: (26 commits)
  t/perf: add performance tests for multi-pack reuse
  pack-bitmap: enable reuse from all bitmapped packs
  pack-objects: allow setting `pack.allowPackReuse` to "single"
  t/test-lib-functions.sh: implement `test_trace2_data` helper
  pack-objects: add tracing for various packfile metrics
  pack-bitmap: prepare to mark objects from multiple packs for reuse
  pack-revindex: implement `midx_pair_to_pack_pos()`
  pack-revindex: factor out `midx_key_to_pack_pos()` helper
  midx: implement `midx_preferred_pack()`
  git-compat-util.h: implement checked size_t to uint32_t conversion
  pack-objects: include number of packs reused in output
  pack-objects: prepare `write_reused_pack_verbatim()` for multi-pack reuse
  pack-objects: prepare `write_reused_pack()` for multi-pack reuse
  pack-objects: pass `bitmapped_pack`'s to pack-reuse functions
  pack-objects: keep track of `pack_start` for each reuse pack
  pack-objects: parameterize pack-reuse routines over a single pack
  pack-bitmap: return multiple packs via `reuse_partial_packfile_from_bitmap()`
  pack-bitmap: simplify `reuse_partial_packfile_from_bitmap()` signature
  ewah: implement `bitmap_is_empty()`
  pack-bitmap: pass `bitmapped_pack` struct to pack-reuse functions
  ...
2024-01-12 16:09:56 -08:00
René Scharfe 8277dbe987 git-compat-util: convert skip_{prefix,suffix}{,_mem} to bool
Use the data type bool and its values true and false to document the
binary return value of skip_prefix() and friends more explicitly.

This first use of stdbool.h, introduced with C99, is meant to check
whether there are platforms that claim support for C99, as tested by
7bc341e21b (git-compat-util: add a test balloon for C99 support,
2021-12-01), but still lack that header for some reason.

A fallback based on a wider type, e.g. int, would have to deal with
comparisons somehow to emulate that any non-zero value is true:

   bool b1 = 1;
   bool b2 = 2;
   if (b1 == b2) puts("This is true.");

   int i1 = 1;
   int i2 = 2;
   if (i1 == i2) puts("Not printed.");
   #define BOOLEQ(a, b) (!(a) == !(b))
   if (BOOLEQ(i1, i2)) puts("This is true.");

So we'd be better off using bool everywhere without a fallback, if
possible.  That's why this patch doesn't include any.

Signed-off-by: René Scharfe <l.s.r@web.de>
Acked-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-12-18 09:08:24 -08:00
Taylor Blau ed9f41480a git-compat-util.h: implement checked size_t to uint32_t conversion
In a similar fashion as other checked cast functions in this header
(such as `cast_size_t_to_ulong()` and `cast_size_t_to_int()`), implement
a checked cast function for going from a size_t to a uint32_t value.

This function will be utilized in a future commit which needs to make
such a conversion.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-12-14 14:38:08 -08:00
Junio C Hamano aaf0a421e2 Merge branch 'mp/rebase-label-length-limit'
Overly long label names used in the sequencer machinery are now
chopped to fit under filesystem limitation.

* mp/rebase-label-length-limit:
  rebase: allow overriding the maximal length of the generated labels
  sequencer: truncate labels to accommodate loose refs
2023-08-24 09:32:33 -07:00
Mark Ruvald Pedersen 7481d2bfca sequencer: truncate labels to accommodate loose refs
Some commits may have unusually long subject lines. When those subject
lines are used as labels in the `--rebase-merges` mode of `git rebase`,
they can cause errors when writing the corresponding loose refs because
most file systems have a maximal file name length of 255 (`NAME_MAX`).
The symptom looks like this:

	$ git rebase --continue
	error: cannot lock ref 'refs/rewritten/SANITIZED-SUBJECT': Unable to create '.git/refs/rewritten/SANITIZED-SUBJECT.lock': File name too long - where SANITIZED-SUBJECT is very long

Let's accommodate this situation by truncating the labels.

Care must be taken in case the subject line contains multi-byte
characters so as not to truncate in the middle of a character.

Signed-off-by: Mark Ruvald Pedersen <mped@demant.com>
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-08-10 10:12:29 -07:00
Junio C Hamano ce481ac8b3 Merge branch 'cw/compat-util-header-cleanup'
Further shuffling of declarations across header files to streamline
file dependencies.

* cw/compat-util-header-cleanup:
  git-compat-util: move alloc macros to git-compat-util.h
  treewide: remove unnecessary includes for wrapper.h
  kwset: move translation table from ctype
  sane-ctype.h: create header for sane-ctype macros
  git-compat-util: move wrapper.c funcs to its header
  git-compat-util: move strbuf.c funcs to its header
2023-07-17 11:30:42 -07:00
Junio C Hamano b3d1c85d48 Merge branch 'gc/config-context'
Reduce reliance on a global state in the config reading API.

* gc/config-context:
  config: pass source to config_parser_event_fn_t
  config: add kvi.path, use it to evaluate includes
  config.c: remove config_reader from configsets
  config: pass kvi to die_bad_number()
  trace2: plumb config kvi
  config.c: pass ctx with CLI config
  config: pass ctx with config files
  config.c: pass ctx in configsets
  config: add ctx arg to config_fn_t
  urlmatch.h: use config_fn_t type
  config: inline git_color_default_config
2023-07-06 11:54:48 -07:00
Calvin Wan 91c080dff5 git-compat-util: move alloc macros to git-compat-util.h
alloc_nr, ALLOC_GROW, and ALLOC_GROW_BY are commonly used macros for
dynamic array allocation. Moving these macros to git-compat-util.h with
the other alloc macros focuses alloc.[ch] to allocation for Git objects
and additionally allows us to remove inclusions to alloc.h from files
that solely used the above macros.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-07-05 11:42:31 -07:00
Calvin Wan 28aed75a9f kwset: move translation table from ctype
This table was originally introduced to solely be used with kwset
machinery (0f871cf56e), so it would make sense for it to belong in
kwset.[ch] rather than ctype.c and git-compat-util.h. It is only used in
diffcore-pickaxe.c, which already includes kwset.h so no other headers
have to be modified.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-07-05 11:41:18 -07:00
Calvin Wan 1890ce84bd sane-ctype.h: create header for sane-ctype macros
Splitting these macros from git-compat-util.h cleans up the file and
allows future third-party sources to not use these overrides if they do
not wish to.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-07-05 11:41:18 -07:00
Calvin Wan 382f6940af git-compat-util: move wrapper.c funcs to its header
Since the functions in wrapper.c are widely used across the codebase,
include it by default in git-compat-util.h. A future patch will remove
now unnecessary inclusions of wrapper.h from other files.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-07-05 11:41:18 -07:00
Calvin Wan fda5d9595d git-compat-util: move strbuf.c funcs to its header
While functions like starts_with() probably should not belong in the
boundaries of the strbuf library, this commit focuses on first splitting
out headers from git-compat-util.h.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-07-05 11:41:18 -07:00
Glen Choo a4e7e317f8 config: add ctx arg to config_fn_t
Add a new "const struct config_context *ctx" arg to config_fn_t to hold
additional information about the config iteration operation.
config_context has a "struct key_value_info kvi" member that holds
metadata about the config source being read (e.g. what kind of config
source it is, the filename, etc). In this series, we're only interested
in .kvi, so we could have just used "struct key_value_info" as an arg,
but config_context makes it possible to add/adjust members in the future
without changing the config_fn_t signature. We could also consider other
ways of organizing the args (e.g. moving the config name and value into
config_context or key_value_info), but in my experiments, the
incremental benefit doesn't justify the added complexity (e.g. a
config_fn_t will sometimes invoke another config_fn_t but with a
different config value).

In subsequent commits, the .kvi member will replace the global "struct
config_reader" in config.c, making config iteration a global-free
operation. It requires much more work for the machinery to provide
meaningful values of .kvi, so for now, merely change the signature and
call sites, pass NULL as a placeholder value, and don't rely on the arg
in any meaningful way.

Most of the changes are performed by
contrib/coccinelle/config_fn_ctx.pending.cocci, which, for every
config_fn_t:

- Modifies the signature to accept "const struct config_context *ctx"
- Passes "ctx" to any inner config_fn_t, if needed
- Adds UNUSED attributes to "ctx", if needed

Most config_fn_t instances are easily identified by seeing if they are
called by the various config functions. Most of the remaining ones are
manually named in the .cocci patch. Manual cleanups are still needed,
but the majority of it is trivial; it's either adjusting config_fn_t
that the .cocci patch didn't catch, or adding forward declarations of
"struct config_context ctx" to make the signatures make sense.

The non-trivial changes are in cases where we are invoking a config_fn_t
outside of config machinery, and we now need to decide what value of
"ctx" to pass. These cases are:

- trace2/tr2_cfg.c:tr2_cfg_set_fl()

  This is indirectly called by git_config_set() so that the trace2
  machinery can notice the new config values and update its settings
  using the tr2 config parsing function, i.e. tr2_cfg_cb().

- builtin/checkout.c:checkout_main()

  This calls git_xmerge_config() as a shorthand for parsing a CLI arg.
  This might be worth refactoring away in the future, since
  git_xmerge_config() can call git_default_config(), which can do much
  more than just parsing.

Handle them by creating a KVI_INIT macro that initializes "struct
key_value_info" to a reasonable default, and use that to construct the
"ctx" arg.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-06-28 14:06:39 -07:00
Elijah Newren dd77d58795 git-compat-util.h: remove unneccessary include of wildmatch.h
The include of wildmatch.h in git-compat-util.h was added in cebcab189a
(Makefile: add USE_WILDMATCH to use wildmatch as fnmatch, 2013-01-01) as
a way to be able to compile-time force any calls to fnmatch() to instead
invoke wildmatch().  The defines and inline function were removed in
70a8fc999d (stop using fnmatch (either native or compat), 2014-02-15),
and this include in git-compat-util.h has been unnecessary ever since.

Remove the include from git-compat-util.h, but add it to the .c files
that had omitted the direct #include they needed.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-06-21 13:39:54 -07:00
Junio C Hamano 0807e57807 Merge branch 'en/header-split-cache-h'
Header clean-up.

* en/header-split-cache-h: (24 commits)
  protocol.h: move definition of DEFAULT_GIT_PORT from cache.h
  mailmap, quote: move declarations of global vars to correct unit
  treewide: reduce includes of cache.h in other headers
  treewide: remove double forward declaration of read_in_full
  cache.h: remove unnecessary includes
  treewide: remove cache.h inclusion due to pager.h changes
  pager.h: move declarations for pager.c functions from cache.h
  treewide: remove cache.h inclusion due to editor.h changes
  editor: move editor-related functions and declarations into common file
  treewide: remove cache.h inclusion due to object.h changes
  object.h: move some inline functions and defines from cache.h
  treewide: remove cache.h inclusion due to object-file.h changes
  object-file.h: move declarations for object-file.c functions from cache.h
  treewide: remove cache.h inclusion due to git-zlib changes
  git-zlib: move declarations for git-zlib functions from cache.h
  treewide: remove cache.h inclusion due to object-name.h changes
  object-name.h: move declarations for object-name.c functions from cache.h
  treewide: remove unnecessary cache.h inclusion
  treewide: be explicit about dependence on mem-pool.h
  treewide: be explicit about dependence on oid-array.h
  ...
2023-04-25 13:56:20 -07:00
Elijah Newren 65156bb7ec treewide: remove double forward declaration of read_in_full
cache.h's nature of a dumping ground of includes prevented it from
being included in some compat/ files, forcing us into a workaround
of having a double forward declaration of the read_in_full() function
(see commit 14086b0a13 ("compat/pread.c: Add a forward declaration to
fix a warning", 2007-11-17)).  Now that we have moved functions like
read_in_full() from cache.h to wrapper.h, and wrapper.h isn't littered
with unrelated and scary #defines, get rid of the extra forward
declaration and just have compat/pread.c include wrapper.h.

Signed-off-by: Elijah Newren <newren@gmail.com>
Acked-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-11 08:52:11 -07:00
Junio C Hamano cdb1ef07d2 Merge branch 'pe/time-use-gettimeofday'
time(2) on glib 2.31+, especially on Linux, goes out of sync with
higher resolution timers used for gettimeofday(2) and by the
filesystem.  Replace all calls to it with a git_time() wrapper and
use gettimeofday(2) in its implementation.

* pe/time-use-gettimeofday:
  git-compat-util: use gettimeofday(2) for time(2)
2023-03-28 10:51:52 -07:00
Paul Eggert 370ddcbc89 git-compat-util: use gettimeofday(2) for time(2)
Use gettimeofday instead of time(NULL) to get current time.
This avoids clock skew on glibc 2.31+ on Linux, where in the
first 1 to 2.5 ms of every second, time(NULL) returns a
value that is one less than the tv_sec part of
higher-resolution timestamps such as those returned by
gettimeofday or timespec_get, or those in the file system.
There are similar clock skew problems on AIX and MS-Windows,
which have problems in the first 5 ms of every second.

Without this patch, users can observe Git issuing a
timestamp T+1 before it issues timestamp T, because Git
sometimes uses time(NULL) or time(&t) and sometimes uses
higher-res methods like gettimeofday.  Although strictly
speaking users should tolerate this behavior because a
superuser can always change the clock back, this is a
quality of implementation issue and users naturally expect
Git to issue timestamps in increasing order unless the
superuser has fiddled with the system clock.

This patch always uses gettimeofday(...) instead of time(...),
and I have verified that the resulting .o files never refer
to the name 'time'.  A trickier patch would change only
those calls for which timestamp monotonicity is user-visible.
Such a patch would require more expertise about Git internals,
though, and would be harder to maintain later.

Another possibility would be to change Git's documentation
to warn users that Git does not always issue timestamps in
increasing order.  However, Git users would likely be either
dismayed by this possibility, or confused by the level of
detail that any such documentation would require.

Yet another possibility would be to fix the Linux kernel so
that the time syscall is consistent with the other timestamp
syscalls.  I suppose this has not been done due to
performance implications.  (Git's use of timestamps is rare
enough that performance is not a significant consideration
for git.)  However, this wouldn't fix Git's problem on older
Linux kernels, or on AIX or MS-Windows.

Signed-off-by: Paul Eggert <eggert@cs.ucla.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-03-21 13:11:42 -07:00
Junio C Hamano 92c56da096 Merge branch 'mc/credential-helper-www-authenticate'
Allow information carried on the WWW-AUthenticate header to be
passed to the credential helpers.

* mc/credential-helper-www-authenticate:
  credential: add WWW-Authenticate header to cred requests
  http: read HTTP WWW-Authenticate response headers
  t5563: add tests for basic and anoymous HTTP access
2023-03-17 14:03:10 -07:00
Matthew John Cheetham 6b8dda9a4f http: read HTTP WWW-Authenticate response headers
Read and store the HTTP WWW-Authenticate response headers made for
a particular request.

This will allow us to pass important authentication challenge
information to credential helpers or others that would otherwise have
been lost.

libcurl only provides us with the ability to read all headers recieved
for a particular request, including any intermediate redirect requests
or proxies. The lines returned by libcurl include HTTP status lines
delinating any intermediate requests such as "HTTP/1.1 200". We use
these lines to reset the strvec of WWW-Authenticate header values as
we encounter them in order to only capture the final response headers.

The collection of all header values matching the WWW-Authenticate
header is complicated by the fact that it is legal for header fields to
be continued over multiple lines, but libcurl only gives us each
physical line a time, not each logical header. This line folding feature
is deprecated in RFC 7230 [1] but older servers may still emit them, so
we need to handle them.

In the future [2] we may be able to leverage functions to read headers
from libcurl itself, but as of today we must do this ourselves.

[1] https://www.rfc-editor.org/rfc/rfc7230#section-3.2
[2] https://daniel.haxx.se/blog/2022/03/22/a-headers-api-for-libcurl/

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-27 10:40:40 -08:00
Elijah Newren b73ecb4811 hex.h: move some hex-related declarations from cache.h
hex.c contains code for hex-related functions, but for some reason these
functions were declared in the catch-all cache.h.  Move the function
declarations into a hex.h header instead.

This also allows us to remove includes of cache.h from a few C files.
For now, we make cache.h include hex.h, so that it is easier to review
the direct changes being made by this patch.  In the next patch, we will
remove that, and add the necessary direct '#include "hex.h"' in the
hundreds of C files that need it.

Note that reviewing the header changes in this commit might be
simplified via
    git log --no-walk -p --color-moved $COMMIT -- '*.h'`
In particular, it highlights the simple movement of code in .h files
rather nicely.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-23 17:25:28 -08:00
Junio C Hamano 5427bb4893 Merge branch 'rs/use-enhanced-bre-on-macos'
Newer regex library macOS stopped enabling GNU-like enhanced BRE,
where '\(A\|B\)' works as alternation, unless explicitly asked with
the REG_ENHANCED flag.  "git grep" now can be compiled to do so, to
retain the old behaviour.

* rs/use-enhanced-bre-on-macos:
  use enhanced basic regular expressions on macOS
2023-01-23 13:39:51 -08:00
Junio C Hamano 60ce816cb6 Merge branch 'rs/dup-array'
Code cleaning.

* rs/dup-array:
  use DUP_ARRAY
  add DUP_ARRAY
  do full type check in BARF_UNLESS_COPYABLE
  factor out BARF_UNLESS_COPYABLE
  mingw: make argv2 in try_shell_exec() non-const
2023-01-21 17:21:58 -08:00
Junio C Hamano 508386c6c5 Sync with 2.39.1 2023-01-16 12:11:58 -08:00
René Scharfe d2ec87a684 add DUP_ARRAY
Add a macro for allocating and populating a shallow copy of an array.
It is intended to replace a sequence like this:

   ALLOC_ARRAY(dst, n);
   COPY_ARRAY(dst, src, n);

With the less repetitve:

   DUP_ARRAY(dst, src, n);

It checks whether the types of source and destination are compatible to
ensure the copy can be used safely.

An easier alternative would be to only consider the source and return
a void pointer, that could be used like this:

   dst = ARRAY_DUP(src, n);

That would be more versatile, as it could be used in declarations as
well.  Making it type-safe would require the use of typeof_unqual from
C23, though.

So use the safe and compatible variant for now.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-01-09 13:28:36 +09:00
René Scharfe 08e8c26665 do full type check in BARF_UNLESS_COPYABLE
Use __builtin_types_compatible_p to perform a full type check if
possible.  Otherwise fall back to the old size comparison, but add a
non-evaluated assignment to catch more type mismatches.  It doesn't flag
copies between arrays with different signedness, but that's as close to
a full type check as it gets without the builtin, as far as I can see.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-01-09 13:28:36 +09:00
René Scharfe 1891846fa4 factor out BARF_UNLESS_COPYABLE
Move the common basic element type check of COPY_ARRAY and MOVE_ARRAY to
a new macro.  This reduces code duplication and simplifies adding more
elaborate checks.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-01-09 13:28:36 +09:00
René Scharfe 54463d32ef use enhanced basic regular expressions on macOS
When 1819ad327b (grep: fix multibyte regex handling under macOS,
2022-08-26) started to use the native regex library instead of Git's
own (compat/regex/), it lost support for alternation in basic
regular expressions.

Bring it back by enabling the flag REG_ENHANCED on macOS when
compiling basic regular expressions.

Reported-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-01-08 10:06:34 +09:00
Junio C Hamano efcc48efa7 Merge branch 'jk/avoid-redef-system-functions-2.30'
Redefining system functions for a few functions did not follow our
usual "implement git_foo() and #define foo(args) git_foo(args)"
pattern, which has broken build for some folks.

* jk/avoid-redef-system-functions-2.30:
  git-compat-util: undefine system names before redeclaring them
  git-compat-util: avoid redefining system function names
2022-12-19 11:46:16 +09:00
Junio C Hamano 96738bb0e1 Sync with 2.38.3 2022-12-13 21:25:15 +09:00
Junio C Hamano fea9f607a8 Sync with Git 2.37.5 2022-12-13 21:23:36 +09:00
Junio C Hamano 431f6e67e6 Merge branch 'maint-2.36' into maint-2.37 2022-12-13 21:20:35 +09:00
Junio C Hamano 8253c00421 Merge branch 'maint-2.35' into maint-2.36 2022-12-13 21:19:11 +09:00
Junio C Hamano fbabbc30e7 Merge branch 'maint-2.34' into maint-2.35 2022-12-13 21:17:10 +09:00
Junio C Hamano 3748b5b7f5 Merge branch 'maint-2.33' into maint-2.34 2022-12-13 21:15:22 +09:00
Junio C Hamano 5f22dcc02d Sync with Git 2.32.5 2022-12-13 21:13:11 +09:00
Junio C Hamano 8a755eddf5 Sync with Git 2.31.6 2022-12-13 21:09:40 +09:00
Junio C Hamano 16128765d7 Git 2.30.7
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Sync with Git 2.30.7
2022-12-13 21:02:20 +09:00
Patrick Steinhardt 48050c42c7 pretty: fix integer overflow in wrapping format
The `%w(width,indent1,indent2)` formatting directive can be used to
rewrap text to a specific width and is designed after git-shortlog(1)'s
`-w` parameter. While the three parameters are all stored as `size_t`
internally, `strbuf_add_wrapped_text()` accepts integers as input. As a
result, the casted integers may overflow. As these now-negative integers
are later on passed to `strbuf_addchars()`, we will ultimately run into
implementation-defined behaviour due to casting a negative number back
to `size_t` again. On my platform, this results in trying to allocate
9000 petabyte of memory.

Fix this overflow by using `cast_size_t_to_int()` so that we reject
inputs that cannot be represented as an integer.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-12-09 14:26:21 +09:00
Jeff King e1a95b78d8 git-compat-util: undefine system names before redeclaring them
When we define a macro to point a system function (e.g., flockfile) to
our custom wrapper, we should make sure that the system did not already
define it as a macro. This is rarely a problem, but can cause
compilation failures if both of these are true:

  - we decide to define our own wrapper even though the system provides
    the function; we know this happens at least with uclibc, which may
    declare flockfile, etc, without _POSIX_THREAD_SAFE_FUNCTIONS

  - the system version is declared as a macro; we know this happens at
    least with uclibc's version of getc_unlocked()

So just handling getc_unlocked() would be sufficient to deal with the
real-world case we've seen. But since it's easy to do, we may as well be
defensive about the other macro wrappers added in the previous patch.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-12-05 12:15:37 +09:00
Jeff King e0c08a4f73 git-compat-util: avoid redefining system function names
Our git-compat-util header defines a few noop wrappers for system
functions if they are not available. This was originally done with a
macro, but in 15b52a44e0 (compat-util: type-check parameters of no-op
replacement functions, 2020-08-06) we switched to inline functions,
because it gives us basic type-checking.

This can cause compilation failures when the system _does_ declare those
functions but we choose not to use them, since the compiler will
complain about the redeclaration. This was seen in the real world when
compiling against certain builds of uclibc, which may leave
_POSIX_THREAD_SAFE_FUNCTIONS unset, but still declare flockfile() and
funlockfile().

It can also be seen on any platform that has setitimer() if you choose
to compile without it (which plausibly could happen if the system
implementation is buggy). E.g., on Linux:

  $ make NO_SETITIMER=IWouldPreferNotTo git.o
      CC git.o
  In file included from builtin.h:4,
                   from git.c:1:
  git-compat-util.h:344:19: error: conflicting types for ‘setitimer’; have ‘int(int,  const struct itimerval *, struct itimerval *)’
    344 | static inline int setitimer(int which UNUSED,
        |                   ^~~~~~~~~
  In file included from git-compat-util.h:234:
  /usr/include/x86_64-linux-gnu/sys/time.h:155:12: note: previous declaration of ‘setitimer’ with type ‘int(__itimer_which_t,  const struct itimerval * restrict,  struct itimerval * restrict)’
    155 | extern int setitimer (__itimer_which_t __which,
        |            ^~~~~~~~~
  make: *** [Makefile:2714: git.o] Error 1

Here I think the compiler is complaining about the lack of "restrict"
annotations in our version, but even if we matched it completely (and
there is no way to match all platforms anyway), it would still complain
about a static declaration following a non-static one. Using macros
doesn't have this problem, because the C preprocessor rewrites the name
in our code before we hit this level of compilation.

One way to fix this would just be to revert most of 15b52a44e0. What we
really cared about there was catching build problems with
precompose_argv(), which most platforms _don't_ build, and which is our
custom function. So we could just switch the system wrappers back to
macros; most people build the real versions anyway, and they don't
change. So the extra type-checking isn't likely to catch bugs.

But with a little work, we can have our cake and eat it, too. If we
define the type-checking wrappers with a unique name, and then redirect
the system names to them with macros, we still get our type checking,
but without redeclaring the system function names.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-12-01 09:11:59 +09:00
Junio C Hamano cf649a3613 Merge branch 'ab/unused-annotation' into maint-2.38
Compilation fix for ancient compilers.

* ab/unused-annotation:
  git-compat-util.h: GCC deprecated message arg only in GCC 4.5+
2022-10-27 15:24:12 -07:00
Junio C Hamano 220604042c Merge branch 'jk/unused-anno-more'
More UNUSED annotation to help using -Wunused option with the
compiler.

* jk/unused-anno-more:
  ll-merge: mark unused parameters in callbacks
  diffcore-pickaxe: mark unused parameters in pickaxe functions
  convert: mark unused parameter in null stream filter
  apply: mark unused parameters in noop error/warning routine
  apply: mark unused parameters in handlers
  date: mark unused parameters in handler functions
  string-list: mark unused callback parameters
  object-file: mark unused parameters in hash_unknown functions
  mark unused parameters in trivial compat functions
  update-index: drop unused argc from do_reupdate()
  submodule--helper: drop unused argc from module_list_compute()
  diffstat_consume(): assert non-zero length
2022-10-27 14:51:52 -07:00
Jeff King 808e91956d mark unused parameters in trivial compat functions
When a platform feature isn't available or in use, we sometimes
conditionally compile empty or trivial functions to turn these into
noops. We need to annotate their parameters so that -Wunused-parameters
won't complain about them.

Note that there are many more of these in compat/mingw.h, but we'll
leave them for now, as there's some trickery required to get the UNUSED
macro available there.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-17 21:24:03 -07:00
Junio C Hamano 44ec91ba4f Merge branch 'ab/unused-annotation'
Compilation fix for ancient compilers.

* ab/unused-annotation:
  git-compat-util.h: GCC deprecated message arg only in GCC 4.5+
2022-10-17 14:56:34 -07:00
Junio C Hamano 410a0e520d Merge branch 'ds/use-platform-regex-on-macos'
With a bit of header twiddling, use the native regexp library on
macOS instead of the compat/ one.

* ds/use-platform-regex-on-macos:
  grep: fix multibyte regex handling under macOS
2022-10-07 17:19:59 -07:00
Alejandro R. Sedeño 7c07f36ad2 git-compat-util.h: GCC deprecated message arg only in GCC 4.5+
https://gcc.gnu.org/gcc-4.5/changes.html says

  The deprecated attribute now takes an optional string argument, for
  example, __attribute__((deprecated("text string"))), that will be
  printed together with the deprecation warning.

While GCC 4.5 is already 12 years old, git checks for even older
versions in places. Let's not needlessly break older compilers when
a small and simple fix is readily available.

Signed-off-by: Alejandro R. Sedeño <asedeno@mit.edu>
Signed-off-by: Alejandro R Sedeño <asedeno@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-05 19:09:59 -07:00
Junio C Hamano dd407f1c7c Merge branch 'ab/unused-annotation'
Undoes 'jk/unused-annotation' topic and redoes it to work around
Coccinelle rules misfiring false positives in unrelated codepaths.

* ab/unused-annotation:
  git-compat-util.h: use "deprecated" for UNUSED variables
  git-compat-util.h: use "UNUSED", not "UNUSED(var)"
2022-09-14 12:56:39 -07:00
Junio C Hamano a6b42ec0c6 Merge branch 'jk/unused-annotation'
Annotate function parameters that are not used (but cannot be
removed for structural reasons), to prepare us to later compile
with -Wunused warning turned on.

* jk/unused-annotation:
  is_path_owned_by_current_uid(): mark "report" parameter as unused
  run-command: mark unused async callback parameters
  mark unused read_tree_recursive() callback parameters
  hashmap: mark unused callback parameters
  config: mark unused callback parameters
  streaming: mark unused virtual method parameters
  transport: mark bundle transport_options as unused
  refs: mark unused virtual method parameters
  refs: mark unused reflog callback parameters
  refs: mark unused each_ref_fn parameters
  git-compat-util: add UNUSED macro
2022-09-14 12:56:39 -07:00
Junio C Hamano aa31cb8974 Merge branch 'jk/pipe-command-nonblock' into maint
Fix deadlocks between main Git process and subprocess spawned via
the pipe_command() API, that can kill "git add -p" that was
reimplemented in C recently.

* jk/pipe-command-nonblock:
  pipe_command(): mark stdin descriptor as non-blocking
  pipe_command(): handle ENOSPC when writing to a pipe
  pipe_command(): avoid xwrite() for writing to pipe
  git-compat-util: make MAX_IO_SIZE define globally available
  nonblock: support Windows
  compat: add function to enable nonblocking pipes
2022-09-13 12:21:08 -07:00