Junio C Hamano [Mon, 23 Dec 2024 17:32:24 +0000 (09:32 -0800)]
Merge branch 'ps/ci-meson'
The meson-build procedure is integrated into CI to catch and
prevent bitrotting.
* ps/ci-meson:
ci: wire up Meson builds
t: introduce compatibility options to clar-based tests
t: fix out-of-tree tests for some git-p4 tests
Makefile: detect missing Meson tests
meson: detect missing tests at configure time
t/unit-tests: rename clar-based unit tests to have a common prefix
Makefile: drop -DSUPPRESS_ANNOTATED_LEAKS
ci/lib: support custom output directories when creating test artifacts
Junio C Hamano [Mon, 23 Dec 2024 17:32:17 +0000 (09:32 -0800)]
Merge branch 'js/range-diff-diff-merges'
"git range-diff" learned to optionally show and compare merge
commits in the ranges being compared, with the --diff-merges
option.
* js/range-diff-diff-merges:
range-diff: introduce the convenience option `--remerge-diff`
range-diff: optionally include merge commits' diffs in the analysis
Junio C Hamano [Mon, 23 Dec 2024 17:32:13 +0000 (09:32 -0800)]
Merge branch 'js/ps-build-cmake-fixup'
Build fixes for Windows.
* js/ps-build-cmake-fixup:
cmake/vcxproj: stop special-casing `remote-ext`
cmake: put the Perl modules into the correct location again
cmake: use the correct file name for the Perl header
cmake(mergetools): better support for out-of-tree builds
cmake: better support for out-of-tree builds follow-up
Junio C Hamano [Mon, 23 Dec 2024 17:32:10 +0000 (09:32 -0800)]
Merge branch 'ps/build-sign-compare'
Start working to make the codebase buildable with -Wsign-compare.
* ps/build-sign-compare:
t/helper: don't depend on implicit wraparound
scalar: address -Wsign-compare warnings
builtin/patch-id: fix type of `get_one_patchid()`
builtin/blame: fix type of `length` variable when emitting object ID
gpg-interface: address -Wsign-comparison warnings
daemon: fix type of `max_connections`
daemon: fix loops that have mismatching integer types
global: trivial conversions to fix `-Wsign-compare` warnings
pkt-line: fix -Wsign-compare warning on 32 bit platform
csum-file: fix -Wsign-compare warning on 32-bit platform
diff.h: fix index used to loop through unsigned integer
config.mak.dev: drop `-Wno-sign-compare`
global: mark code units that generate warnings with `-Wsign-compare`
compat/win32: fix -Wsign-compare warning in "wWinMain()"
compat/regex: explicitly ignore "-Wsign-compare" warnings
git-compat-util: introduce macros to disable "-Wsign-compare" warnings
Junio C Hamano [Mon, 23 Dec 2024 17:32:07 +0000 (09:32 -0800)]
Merge branch 'ps/ci-gitlab-update'
GitLab CI updates.
* ps/ci-gitlab-update:
ci/lib: fix "CI setup" sections with GitLab CI
ci/lib: do not interpret escape sequences in `group ()` arguments
ci/lib: remove duplicate trap to end "CI setup" group
gitlab-ci: update macOS images to Sonoma
Recent reftable updates mistook a NULL return from a request for
0-byte allocation as OOM and died unnecessarily, which has been
corrected.
* ps/reftable-alloc-failures-zalloc-fix:
reftable/basics: return NULL on zero-sized allocations
reftable/stack: fix zero-sized allocation when there are no readers
reftable/merged: fix zero-sized allocation when there are no readers
reftable/stack: don't perform auto-compaction with less than two tables
reftable/basics: return NULL on zero-sized allocations
In the preceding commits we have fixed a couple of issues when
allocating zero-sized objects. These issues were masked by
implementation-defined behaviour. Quoting malloc(3p):
If size is 0, either:
* A null pointer shall be returned and errno may be set to an
implementation-defined value, or
* A pointer to the allocated space shall be returned. The
application shall ensure that the pointer is not used to access an
object.
So it is perfectly valid that implementations of this function may or
may not return a NULL pointer in such a case.
Adapt both `reftable_malloc()` and `reftable_realloc()` so that they
return NULL pointers on zero-sized allocations. This should remove any
implementation-defined behaviour in our allocators and thus allows us to
detect such platform-specific issues more easily going forward.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/stack: fix zero-sized allocation when there are no readers
Similar as the preceding commit, we may try to do a zero-sized
allocation when reloading a reftable stack that ain't got any tables.
It is implementation-defined whether malloc(3p) returns a NULL pointer
in that case or a zero-sized object. In case it does return a NULL
pointer though it causes us to think we have run into an out-of-memory
situation, and thus we return an error.
Fix this by only allocating arrays when they have at least one entry.
Reported-by: Randall S. Becker <rsbecker@nexbridge.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/merged: fix zero-sized allocation when there are no readers
It was reported [1] that Git started to fail with an out-of-memory error
when initializing repositories with the reftable backend on NonStop
platforms. A bisect led to 802c0646ac (reftable/merged: handle
allocation failures in `merged_table_init_iter()`, 2024-10-02), which
changed how we allocate memory when initializing a merged table.
The root cause of this seems to be that NonStop returns a `NULL` pointer
when doing a zero-sized allocation. This would've already happened
before the above change, but we never noticed because we did not check
the result. Now we do notice and thus return an out-of-memory error to
the caller.
Fix the issue by skipping the allocation altogether in case there are no
readers.
Reported-by: Randall S. Becker <rsbecker@nexbridge.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/stack: don't perform auto-compaction with less than two tables
In order to compact tables we need at least two tables. Bail out early
from `reftable_stack_auto_compact()` in case we have less than two
tables.
In the original, `stack_table_sizes_for_compaction()` yields an array
that has the same length as the number of tables. This array is then
passed on to `suggest_compaction_segment()`, which returns an empty
segment in case we have less than two tables. The segment is then passed
to `segment_size()`, which will return `0` because both start and end of
the segment are `0`. And because we only call `stack_compact_range()` in
case we have a positive segment size we don't perform auto-compaction at
all. Consequently, this change does not result in a user-visible change
in behaviour when called with a single table.
But when called with no tables this protects us against a potential
out-of-memory error: `stack_table_sizes_for_compaction()` would try to
allocate a zero-byte object when there aren't any tables, and that may
lead to a `NULL` pointer on some platforms like NonStop which causes us
to bail out with an out-of-memory error.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
It is possible to configure a Git build without Perl when disabling both
our test suite and all Perl-based features. In Meson, this can be
achieved with `meson setup -Dperl=disabled -Dtests=false`.
It was reported by a user that this breaks the Meson build because
gitweb gets built even if Perl was not discovered in such a build:
$ meson setup .. -Dtests=false -Dperl=disabled
...
../gitweb/meson.build:2:43: ERROR: Unable to get the path of a not-found external program
Fix this issue by introducing a new feature-option that allows the user
to configure whether or not to build Gitweb. The feature is set to
'auto' by default and will be disabled automatically in case Perl was
not found on the system.
Reported-by: Daniel Engberg <daniel.engberg.lists@pyret.net> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Jeff King [Fri, 20 Dec 2024 08:49:49 +0000 (03:49 -0500)]
prio-queue: use size_t rather than int for size
The alloc and nr fields of a prio-queue tell us how much memory is
allocated and used in the array. So the natural type for them is size_t,
which prevents overflow on 64-bit systems where "int" is still 32 bits.
This is unlikely to happen in practice, as we typically use it for
storing commits, and having 2^31 of those is rather a lot. But it's good
to keep our generic data structures as flexible as possible. And as we
start to enforce -Wsign-compare, it means that callers need to use
"int", too, and the problem proliferates. Let's fix it at the source.
The changes here can be put into a few groups:
1. Changing the alloc/nr fields in the struct to size_t. This requires
swapping out int for size_t in negotiator/skipping.c, as well as
in prio_queue_get(), because those all iterate over the array.
Building with -Wsign-compare complains about these.
2. Other code that assigns or passes around indexes into the array
(e.g., the swap() and compare() functions) won't trigger
-Wsign-compare because we are simply truncating the values. These
are caught by -Wconversion, but I've adjusted them here to
future-proof us.
3. In prio_queue_reverse() we compute "queue->nr - 1" without checking
if anything is in the queue, which underflows now that nr is
unsigned. We can fix that by returning early when the queue is
empty (there is nothing to reverse).
4. The insertion_ctr variable is currently unsigned, but can likewise
grow (it is actually worse, because adding and removing an element
many times will keep increasing the counter, even though "nr" does
not). I've bumped that to size_t here, as well.
But -Wconversion notes that computing the "cmp" result by
subtracting the counters and assigning to "int" is a potential
problem. And that's true even before this patch, since we use an
unsigned counter (imagine comparing "2^32-1" and "0", which should
be a high positive value, but instead is "-1" as a signed int).
Since we only care about the sign (and not the magnitude) of the
result, we could fix this by swapping out the subtraction for a
ternary comparison. Probably the performance impact would be
negligible, since we just called into a custom compare function and
branched on its result anyway. But it's easy enough to do a
branchless version by subtracting the comparison results.
Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git bundle create" with an annotated tag on the positive end of
the revision range had a workaround code for older limitation in
the revision walker, which has become unnecessary.
Junio C Hamano [Thu, 19 Dec 2024 18:58:28 +0000 (10:58 -0800)]
Merge branch 'jc/set-head-symref-fix'
"git fetch" from a configured remote learned to update a missing
remote-tracking HEAD but it asked the remote about their HEAD even
when it did not need to, which has been corrected. Incidentally,
this also corrects "git fetch --tags $URL" which was broken by the
new feature in an unspecified way.
* jc/set-head-symref-fix:
fetch: do not ask for HEAD unnecessarily
Junio C Hamano [Thu, 19 Dec 2024 18:58:27 +0000 (10:58 -0800)]
Merge branch 'bf/set-head-symref'
When "git fetch $remote" notices that refs/remotes/$remote/HEAD is
missing and discovers what branch the other side points with its
HEAD, refs/remotes/$remote/HEAD is updated to point to it.
* bf/set-head-symref:
fetch set_head: handle mirrored bare repositories
fetch: set remote/HEAD if it does not exist
refs: add create_only option to refs_update_symref_extended
refs: add TRANSACTION_CREATE_EXISTS error
remote set-head: better output for --auto
remote set-head: refactor for readability
refs: atomically record overwritten ref in update_symref
refs: standardize output of refs_read_symbolic_ref
t/t5505-remote: test failure of set-head
t/t5505-remote: set default branch to main
Taylor Blau [Fri, 13 Dec 2024 19:20:02 +0000 (14:20 -0500)]
pack-bitmap.c: ensure pack validity for all reuse packs
Commit 44f9fd6496 (pack-bitmap.c: check preferred pack validity when
opening MIDX bitmap, 2022-05-24) prevents a race condition whereby the
preferred pack disappears between opening the MIDX bitmap and attempting
verbatim reuse out of its packs.
That commit forces open_midx_bitmap_1() to ensure the validity of the
MIDX's preferred pack, meaning that we have an open file handle on the
*.pack, ensuring that we can reuse bytes out of verbatim later on in the
process[^1].
But 44f9fd6496 was not extended to cover multi-pack reuse, meaning that
this same race condition exists for non-preferred packs during verbatim
reuse. Work around that race in the same way by only marking valid packs
as reuse-able. For packs that aren't reusable, skip over them but
include the number of objects they have to ensure we allocate a large
enough 'reuse' bitmap (e.g. if a pack in the middle of the MIDX
disappeared but we still want to reuse later packs).
Since we're ensuring the validity of these packs within the verbatim
reuse code, we no longer have to special-case the preferred pack and
open it within the open_midx_bitmap_1() function.
An alternative approach to the one taken here would be to open all
MIDX'd packs from within open_midx_bitmap_1(). But that would be both
slower and make the bitmaps less useful, since we can still perform some
pack reuse among the packs that still exist when the *.bitmap is opened.
After applying this patch, we can simulate the new behavior after
instrumenting Git like so:
Note that we could relax the single-pack version of this which was most
recently addressed in dc1daacdcc (pack-bitmap: check pack validity when
opening bitmap, 2021-07-23), but only partially. Because we still need
to know the object count in the pack, we'd still have to open the pack's
*.idx, so the savings there are marginal.
Note likewise that we add a new "if (!packs_nr)" early return in the
pack reuse code to avoid a potentially expensive allocation on the
'reuse' bitmap in the case that no packs are available for reuse.
[^1]: Unless we run out of open file handles. If that happens and we are
forced to close the only open file handle of a file that has been
removed from underneath us, there is nothing we can do.
Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Kyle Lippincott [Wed, 18 Dec 2024 00:57:02 +0000 (00:57 +0000)]
doc: remove extra quotes in generated docs
Commit a38edab7c8 (Makefile: generate doc versions via GIT-VERSION-GEN,
2024-12-06) moved these variables from the Makefile to asciidoc.conf.in.
When doing so, some extraneous quotes were added; these are visible in
the generated .xml files, at least, and possibly in other locations:
Junio C Hamano [Wed, 18 Dec 2024 00:17:28 +0000 (16:17 -0800)]
Merge https://github.com/j6t/gitk
* 'master' of https://github.com/j6t/gitk:
gitk: offer "Copy commit ID to X11 selection" only on X11
gitk: support auto-copy comit ID to primary clipboard
gitk: prefs dialog: refine Auto-select UI
gitk: UI text: change "SHA1 ID" to "Commit ID"
gitk: add text wrapping preferences
gitk: make headings of preferences bold
gitk: check main window visibility before waiting for it to show
gitk: sv.po: Update Swedish translation (323t)
Johannes Sixt [Tue, 17 Dec 2024 20:54:58 +0000 (21:54 +0100)]
Merge branch 'ah/commit-id-to-clipboard'
* ah/commit-id-to-clipboard:
gitk: offer "Copy commit ID to X11 selection" only on X11
gitk: support auto-copy comit ID to primary clipboard
gitk: prefs dialog: refine Auto-select UI
gitk: UI text: change "SHA1 ID" to "Commit ID"
When the `vcxproj` target was introduced in `config.mak.uname` to allow
building Git with the Visual C toolchain, the `git remote-ext` command
was always executed in its dashed form. Therefore, it was impossible to
pass the test suite unless that command existed in its dashed form, and
we had to special-case this.
Later, when the `vcxproj` target got out of fashion because Visual
Studio gained native support for CMake builds, this special-casing was
copied without questioning it.
But as of 675df192c5f (transport-helper: do not run git-remote-ext etc.
in dashed form, 2020-08-26), the reason for this special-casing no
longer exists. So let's just drop it.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
cmake: put the Perl modules into the correct location again
In ccfba9e0c45 (Makefile: use "generate-perl.sh" to massage Perl
library, 2024-12-06), the previous strategy (which avoided spawning a
shell script to transform the files) was replaced by the same
`generate-perl.sh` invocation as for the Makefile-based build.
The only difference is that now the transformation tries to handle the
Perl modules in-place (which ends up in empty files because the same
file is used as input and output via stdin/stdout redirection), and the
Perl script cannot find them anymore because they are not in the
expected place.
Let's put them into the expected place again, i.e. into
`perl/build/lib/` instead of `perl/`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
cmake: use the correct file name for the Perl header
In e4b488049a5 (Makefile: extract script to massage Perl scripts,
2024-12-06), the code was refactored that is used to transform the Perl
scripts/modules to their final form.
Even the CMake-based build was adjusted, but the change used the file
name `PERL-HEADER` instead of the file name used by the Makefile-based
build (same name but with the `GIT-` prefix). Let's adjust the former to
the latter.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
cmake(mergetools): better support for out-of-tree builds
In 7e0730c8baa (t: better support for out-of-tree builds, 2024-12-06)
the strategy was changed from letting `t7609-mergetool--lib.sh`
hard-code the directory where it expects to find the merge tools to
hard-coding that value in the placeholder `@GIT_TEST_MERGE_TOOLS_DIR@`
that is replaced during the build.
However, likely due to a copy/paste mistake (and reviewers missed this,
too), the CMake-based build was adjusted incorrectly, replacing that
placeholder not with the path to the merge tools, but with a Boolean
indicating whether to use a runtime-generated path prefix or not.
Let's fix that, addressing this CMake-build's symptom:
Initialized empty Git repository in D:/a/git/git/t/trash directory.t7609-mergetool--lib/.git/
++ . true/vimdiff
./test-lib.sh: line 1021: true/vimdiff: No such file or directory
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
cmake: better support for out-of-tree builds follow-up
In 7e0730c8baa (t: better support for out-of-tree builds, 2024-12-06),
the `bin-wrappers/` strategy was changed so that it no longer hard-codes
the template directory to be `@BUILD_DIR@/templates/blt`, but instead
interpolates the `@TEMPLATE_DIR@` placeholder during the build.
However, this commit only adjusted the `Makefile`-based build.
Let's adjust the CMake-based build as well. This fixes t0000.15 which
would otherwise fail with:
++ echo ''\''t1234-verbose/err'\'' is not empty, it contains:'
't1234-verbose/err' is not empty, it contains:
++ cat t1234-verbose/err
warning: templates not found in @TEMPLATE_DIR@
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
GitHub ci(windows): speed up initializing Git for Windows' minimal SDK again
It used to be the case that initializing the minimal SDK (i.e. a
radically slimmed-down subset of Git for Windows' development
environment intended to perform the CI builds and little else) took
a bit over one minute, would then be cached, and subsequent jobs would
take at most half a dozen seconds to initialize said minimal SDK.
It is important that this step is fast because we have to run the test
suite in parallel, in a set of matrix jobs, to offset the slowness of
the shell-based test suite, and each and every job has to initialize the
very same minimal SDK.
While it may sound as if parallelizing the jobs might only waste the
generously-provided build minutes but at least the _wallclock_ time
would pass quick, in reality it matters a lot: Frequently Git for
Windows' or GitGitGadget PRs get stuck waiting for quite a while before
CI builds start because other PRs' builds still spend substantial
amounts of time to run, blocking due to the concurrency limit being
reached.
Since 91839a88277 (ci: create script to set up Git for Windows SDK,
2024-10-09), the situation has worsened: every job that requires the
minimal Git for Windows SDK spends roughly two-and-a-half minutes doing
so.
With the switch away from the GitHub Action `setup-git-for-windows-sdk`,
we incurred more downsides:
- It is no longer possible for said Action to fix problems independently
from the Git repository, e.g. when new rules about GitHub Actions
require changes in the way the minimal SDK is initialized.
- The minimal SDK was installed specifically outside of the worktree so
as not to clutter it nor incur an additional cost to verify that the
worktree is clean.
Therefore, even if it would be nice to have a shared process between
GitHub and GitLab based CI builds, let's switch the GitHub-based CI back
to the tried-and-tested `setup-git-for-windows-sdk` Action.
This commit partially reverts 91839a88277 (ci: create script to set up
Git for Windows SDK, 2024-10-09).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
In 391bceae435 (compat/mingw: support POSIX semantics for atomic
renames, 2024-10-27), we taught the `mingw_rename()` function to respect
POSIX semantics, but we did so only as a fallback after `_wrename()`
fails.
This hid a bug in the implementation that was not caught by Git's test
suite: The `CreateFileW()` function _can_ open handles to directories,
but not when asked to use the `FILE_ATTRIBUTE_NORMAL` flag, as that flag
only is allowed for files.
Let's fix this by using the common `FILE_FLAG_BACKUP_SEMANTICS` flag
that can be used for opening handles to directories, too.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
range-diff: introduce the convenience option `--remerge-diff`
Just like `git log`, now also `git range-diff` has that option as a
shortcut for the common operation that would otherwise require the quite
unwieldy (if theoretically "more correct") `--diff-mode=remerge` option.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
range-diff: optionally include merge commits' diffs in the analysis
The `git log` command already offers support for including diffs for
merges, via the `--diff-merges=<format>` option.
Let's add corresponding support for `git range-diff`, too. This makes it
more convenient to spot differences between commit ranges that contain
merges.
This is especially true in scenarios with non-trivial merges, i.e.
merges introducing changes other than, or in addition to, what merge ORT
would have produced. Merging a topic branch that changes a function
signature into a branch that added a caller of that function, for
example, would require the merge commit itself to adjust that caller to
the modified signature.
In my code reviews, I found the `--diff-merges=remerge` option
particularly useful.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano [Mon, 16 Dec 2024 01:54:32 +0000 (17:54 -0800)]
Merge branch 'ps/build'
Build procedure update plus introduction of Meson based builds.
* ps/build: (24 commits)
Introduce support for the Meson build system
Documentation: add comparison of build systems
t: allow overriding build dir
t: better support for out-of-tree builds
Documentation: extract script to generate a list of mergetools
Documentation: teach "cmd-list.perl" about out-of-tree builds
Documentation: allow sourcing generated includes from separate dir
Makefile: simplify building of templates
Makefile: write absolute program path into bin-wrappers
Makefile: allow "bin-wrappers/" directory to exist
Makefile: refactor generators to be PWD-independent
Makefile: extract script to generate gitweb.js
Makefile: extract script to generate gitweb.cgi
Makefile: extract script to massage Python scripts
Makefile: extract script to massage Shell scripts
Makefile: use "generate-perl.sh" to massage Perl library
Makefile: extract script to massage Perl scripts
Makefile: consistently use PERL_PATH
Makefile: generate doc versions via GIT-VERSION-GEN
Makefile: generate "git.rc" via GIT-VERSION-GEN
...
Junio C Hamano [Mon, 16 Dec 2024 01:54:26 +0000 (17:54 -0800)]
Merge branch 'jc/forbid-head-as-tagname'
"git tag" has been taught to refuse to create refs/tags/HEAD
as such a tag will be confusing in the context of UI provided by
the Git Porcelain commands.
* jc/forbid-head-as-tagname:
tag: "git tag" refuses to use HEAD as a tagname
t5604: do not expect that HEAD can be a valid tagname
refs: drop strbuf_ prefix from helpers
refs: move ref name helpers around
Junio C Hamano [Mon, 16 Dec 2024 01:54:25 +0000 (17:54 -0800)]
Merge branch 'jk/describe-perf'
"git describe" optimization.
* jk/describe-perf:
describe: split "found all tags" and max_candidates logic
describe: stop traversing when we run out of names
describe: stop digging for max_candidates+1
t/perf: add tests for git-describe
t6120: demonstrate weakness in disjoint-root handling
Junio C Hamano [Fri, 13 Dec 2024 15:33:44 +0000 (07:33 -0800)]
Merge branch 'kn/midx-wo-the-repository'
Yet another "pass the repository through the callchain" topic.
* kn/midx-wo-the-repository:
midx: inline the `MIDX_MIN_SIZE` definition
midx: pass down `hash_algo` to functions using global variables
midx: pass `repository` to `load_multi_pack_index`
midx: cleanup internal usage of `the_repository` and `the_hash_algo`
midx-write: pass down repository to `write_midx_file[_only]`
write-midx: add repository field to `write_midx_context`
midx-write: use `revs->repo` inside `read_refs_snapshot`
midx-write: pass down repository to static functions
packfile.c: remove unnecessary prepare_packed_git() call
midx: add repository to `multi_pack_index` struct
config: make `packed_git_(limit|window_size)` non-global variables
config: make `delta_base_cache_limit` a non-global variable
packfile: pass down repository to `for_each_packed_object`
packfile: pass down repository to `has_object[_kept]_pack`
packfile: pass down repository to `odb_pack_name`
packfile: pass `repository` to static function in the file
packfile: use `repository` from `packed_git` directly
packfile: add repository to struct `packed_git`
Junio C Hamano [Fri, 13 Dec 2024 15:33:41 +0000 (07:33 -0800)]
Merge branch 'es/oss-fuzz'
Backport oss-fuzz tests for us to our codebase.
* es/oss-fuzz:
fuzz: port fuzz-url-decode-mem from OSS-Fuzz
fuzz: port fuzz-parse-attr-line from OSS-Fuzz
fuzz: port fuzz-credential-from-url-gently from OSS-Fuzz
Junio C Hamano [Fri, 13 Dec 2024 15:33:40 +0000 (07:33 -0800)]
Merge branch 'en/fast-import-verify-path'
"git fast-import" learned to reject paths with ".." and "." as
their components to avoid creating invalid tree objects.
* en/fast-import-verify-path:
t9300: test verification of renamed paths
fast-import: disallow more path components
fast-import: disallow "." and ".." path components
log: --remerge-diff needs to keep around commit parents
To show a remerge diff, the merge needs to be recreated. For that to
work, the merge base(s) need to be found, which means that the commits'
parents have to be traversed until common ancestors are found (if any).
However, one optimization that hails all the way back to cb115748ec0d
(Some more memory leak avoidance, 2006-06-17) is to release the commit's
list of parents immediately after showing it _and to set that parent
list to `NULL`_. This can break the merge base computation.
This problem is most obvious when traversing the commits in reverse: In
that instance, if a parent of a merge commit has been shown as part of
the `git log` command, by the time the merge commit's diff needs to be
computed, that parent commit's list of parent commits will have been set
to `NULL` and as a result no merge base will be found (even if one
should be found).
Traversing commits in reverse is far from the only circumstance in which
this problem occurs, though. There are many avenues to traversing at
least one commit in the revision walk that will later be part of a merge
base computation, for example when not even walking any revisions in
`git show <merge1> <merge2>` where `<merge1>` is part of the commit
graph between the parents of `<merge2>`.
Another way to force a scenario where a commit is traversed before it
has to be traversed again as part of a merge base computation is to
start with two revisions (where the first one is reachable from the
second but not in a first-parent ancestry) and show the commit log with
`--topo-order` and `--first-parent`.
Let's fix this by special-casing the `remerge_diff` mode, similar to
what we did with reflogs in f35650dff6a4 (log: do not free parents when
walking reflog, 2017-07-07).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Wire up CI builds for both GitLab and GitHub that use the Meson build
system.
While the setup is mostly trivial, one gotcha is the test output
directory used to be in "t/", but now it is contained in the build
directory. To unify the logic across Makefile- and Meson-based builds we
explicitly set up the `TEST_OUTPUT_DIRECTORY` variable so that it is the
same for both build systems.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
t: introduce compatibility options to clar-based tests
Our unit tests that don't yet use the clar unit testing framework ignore
any option that they do not understand. It is thus fine to just pass
test options we set up globally to those unit tests as they are simply
ignored. This makes our life easier because we don't have to special
case those options with Meson, where test options are set up globally
via `meson test --test-args=`.
But our clar-based unit testing framework is way stricter here and will
fail in case it is passed an unknown option. Stub out these options with
no-ops to make our life a bit easier.
Note that this also requires us to remove the `-x` short option for
`--exclude`. This is because `-x` has another meaning in our integration
tests, as it enables shell tracing. I doubt there are a lot of people
out there using it as we only got a small hand full of clar tests in the
first place. So better change it now so that we can in the long run
improve compatibility between the two different test drivers.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Both t9835 and t9836 exercise git-p4, but one exercises Python 2 whereas
the other one uses Python 3. These tests do not exercise "git p4", but
instead they use "git p4.py". This calls the unbuilt version of
"git-p4.py" that still has the "#!/usr/bin/env python" shebang, which
allows the test to modify which Python version comes first in $PATH,
making it possible to force a Python version.
But "git-p4.py" is not in our PATH during out-of-tree builds, and thus
we cannot locate "git-p4.py". The tests thus break with CMake and Meson.
Fix this by instead manually setting up script wrappers that invoke the
respective Python interpreter directly.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
In the preceding commit, we have introduced consistency checks to Meson
to detect any discrepancies with missing or extraneous tests in its
build instructions. These checks only get executed in Meson though, so
any users of our Makefiles wouldn't be alerted of the fact that they
have to modify the Meson build instructions in case they add or remove
any tests.
Add a comparable test target to our Makefile to plug this gap.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
It is quite easy for the list of integration tests to go out-of-sync
without anybody noticing. Introduce a new configure-time check that
verifies that all tests are wired up properly.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
t/unit-tests: rename clar-based unit tests to have a common prefix
All of the code files for unit tests using the self-grown unit testing
framework have a "t-" prefix to their name. This makes it easy to
identify them and use globbing in our Makefile and in other places. On
the other hand though, our clar-based unit tests have no prefix at all
and thus cannot easily be discerned from other files in the unit test
directory.
Introduce a new "u-" prefix for clar-based unit tests. This prefix will
be used in a subsequent commit to easily identify such tests.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The -DSUPPRESS_ANNOTATED_LEAKS preprocessor directive was used to enable
our `UNLEAK()` macro in the past, which marks memory as still-reachable
so that the leak sanitizer does not complain. Starting with 52c7dbd036
(git-compat-util: drop now-unused `UNLEAK()` macro, 2024-11-20) this
macro has been removed, and thus the preprocessor directive is not
required anymore, either.
Drop it.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
ci/lib: support custom output directories when creating test artifacts
Update `create_failed_test_artifacts ()` so that it can handle arbitrary
test output directories. This fixes creation of these artifacts for
macOS on GitLab CI, which uses a separate output directory already. This
will also be used by our out-of-tree builds with Meson.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
gitk: support auto-copy comit ID to primary clipboard
Auto-select ("Copy commit ID to X11 selection") is useful when a
selection cliboard exists, but otherwise generally meaningless, for
instance on Windows.
Add a similar pref and behavior which copies the commit ID to the
primary clipboard - for platforms without a selection clipboard, but
which can also be useful additionally on platforms with selection.
Note that while autoselect is enabled by default, autocopy isn't.
That's because the selection clipboard is typically dispensable, while
the primary clipboard can be considered a more precious resource,
which we don't want to (clear and) overwrite by default.
Signed-off-by: Avi Halachmi (:avih) <avihpit@yahoo.com>
Tl;DR: change Auto-select text, move the length input to a new line.
The Auto-select preference auto-selects [part of] the commit ID text
at the respective widget on startup, and when the current commit at
the graph changes.
Its real premise, however, is to populate the selection clipboard
with the commit ID. Consider, for instance, how meaningless it is on
platforms without a selection clipboard - like Windows or macOS (on
Windows the selection is not even visible with the default Tk theme,
because it's only visible in focused widgets - which the commit ID
widget is not during normal application of this selection).
So rename the Auto-select label to "Copy commit ID to X11 selection",
to reflect better the ultimate outcome of its application
Note that there exists other, non-X11 platforms with a selection
clipboard, like Wayland, and if a native Tk client exists on such
platforms, then the description will not be accurate, but hopefully
it's not too misleading either.
Additionally, move the length input widget to a new line, because:
- This length applies to both Auto-select and "Copy commit reference"
context menu item, so it's not exclusive to the selection length.
- The next commit will add support for primary clipboard as well,
where this length will also be used.
Also, move the "Hide remotes" item above these selection prefs, to
keep the selection prefs semi-grouped before the spacing of the
following title "Diff display options".
Signed-off-by: Avi Halachmi (:avih) <avihpit@yahoo.com>
Toon Claes [Wed, 11 Dec 2024 20:51:14 +0000 (21:51 +0100)]
bundle: remove unneeded code
The changes in commit c06793a4ed (allow git-bundle to create bottomless
bundle, 2007-08-08) ensure annotated tags are properly preserved when
creating a bundle using a revision range operation.
At the time the range notation would peel the ends to their
corresponding commit, meaning ref v2.0 would point to the v2.0^0 commit.
So the above workaround was introduced. This code looks up the ref
before it's written to the bundle, and if the ref doesn't point to the
object we expect (for tags this would be a tag object), we skip the ref
from the bundle. Instead, when the ref is a tag that's the positive end
of the range (e.g. v2.0 from the range "v1.0..v2.0"), then that ref is
written to the bundle instead.
Later, in 895c5ba3c1 (revision: do not peel tags used in range notation,
2013-09-19), the behavior of parsing ranges was changed and the problem
was fixed at the cause. But the workaround in bundle.c was not reverted.
Now it seems this workaround can cause a race condition. git-bundle(1)
uses setup_revisions() to parse the input into `struct rev_info`. Later,
in write_bundle_refs(), it uses this info to write refs to the bundle.
As mentioned at this point each ref is looked up again and checked
whether it points to the object we expect. If not, the ref is not
written to the bundle. But, when creating a bundle in a heavy traffic
repository (a repo with many references, and frequent ref updates) it's
possible a branch ref was updated between setup_revisions() and
write_bundle_refs() and thus the extra check causes the ref to be
skipped.
The workaround was originally added to deal with tags, but the code path
also gets hit by non-tag refs, causing this race condition. Because it's
no longer needed, remove it and fix the possible race condition.
Signed-off-by: Toon Claes <toon@iotcl.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Whenever we source "ci/lib.sh" we wrap the directives in a separate
group so that they can easily be collapsed in the web UI. And as we
source the script multiple times during a single CI run we thus end up
with the same section name reused multiple times, as well.
This is broken on GitLab CI though, where reusing the same group name is
not supported. The consequence is that only the last of these sections
can be collapsed.
Fix this issue by including the name of the sourcing script in the
group's name.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
ci/lib: do not interpret escape sequences in `group ()` arguments
We use printf to set up sections with GitLab CI, which requires us to
print a bunch of escape sequences via printf. The group name is
controlled by the user and is expanded directly into the formatting
string, which may cause problems in case the argument contains escape
sequences or formatting directives.
Fix this potential issue by using formatting directives to pass variable
data.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
ci/lib: remove duplicate trap to end "CI setup" group
We exlicitly trap on EXIT in order to end the "CI setup" group. This
isn't necessary though given that `begin_group ()` already sets up the
trap for us.
Remove the duplicate trap.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano [Thu, 12 Dec 2024 07:30:28 +0000 (16:30 +0900)]
Merge branch 'ps/build' into ps/ci-meson
* ps/build: (24 commits)
Introduce support for the Meson build system
Documentation: add comparison of build systems
t: allow overriding build dir
t: better support for out-of-tree builds
Documentation: extract script to generate a list of mergetools
Documentation: teach "cmd-list.perl" about out-of-tree builds
Documentation: allow sourcing generated includes from separate dir
Makefile: simplify building of templates
Makefile: write absolute program path into bin-wrappers
Makefile: allow "bin-wrappers/" directory to exist
Makefile: refactor generators to be PWD-independent
Makefile: extract script to generate gitweb.js
Makefile: extract script to generate gitweb.cgi
Makefile: extract script to massage Python scripts
Makefile: extract script to massage Shell scripts
Makefile: use "generate-perl.sh" to massage Perl library
Makefile: extract script to massage Perl scripts
Makefile: consistently use PERL_PATH
Makefile: generate doc versions via GIT-VERSION-GEN
Makefile: generate "git.rc" via GIT-VERSION-GEN
...
Junio C Hamano [Tue, 10 Dec 2024 01:04:57 +0000 (10:04 +0900)]
Merge branch 'ps/reftable-iterator-reuse'
Optimize reading random references out of the reftable backend by
allowing reuse of iterator objects.
* ps/reftable-iterator-reuse:
refs/reftable: reuse iterators when reading refs
reftable/merged: drain priority queue on reseek
reftable/stack: add mechanism to notify callers on reload
refs/reftable: refactor reflog expiry to use reftable backend
refs/reftable: refactor reading symbolic refs to use reftable backend
refs/reftable: read references via `struct reftable_backend`
refs/reftable: figure out hash via `reftable_stack`
reftable/stack: add accessor for the hash ID
refs/reftable: handle reloading stacks in the reftable backend
refs/reftable: encapsulate reftable stack
Junio C Hamano [Tue, 10 Dec 2024 01:04:56 +0000 (10:04 +0900)]
Merge branch 'ps/reftable-detach'
Isolates the reftable subsystem from the rest of Git's codebase by
using fewer pieces of Git's infrastructure.
* ps/reftable-detach:
reftable/system: provide thin wrapper for lockfile subsystem
reftable/stack: drop only use of `get_locked_file_path()`
reftable/system: provide thin wrapper for tempfile subsystem
reftable/stack: stop using `fsync_component()` directly
reftable/system: stop depending on "hash.h"
reftable: explicitly handle hash format IDs
reftable/system: move "dir.h" to its only user
Loosen overly strict ownership check introduced in the recent past,
to keep the promise "cloning a suspicious repository is a safe
first step to inspect it".
* bc/allow-upload-pack-from-other-people:
Allow cloning from repositories owned by another user
Rubén Justo [Wed, 4 Dec 2024 22:44:25 +0000 (23:44 +0100)]
strvec: `strvec_splice()` to a statically initialized vector
We use a singleton empty array to initialize a `struct strvec`;
similar to the empty string singleton we use to initialize a `struct
strbuf`.
Note that an empty strvec instance (with zero elements) does not
necessarily need to be an instance initialized with the singleton.
Let's refer to strvec instances initialized with the singleton as
"empty-singleton" instances.
As a side note, this is the current `strvec_pop()`:
So, with `strvec_pop()` an instance can become empty but it does
not going to be the an "empty-singleton".
This "empty-singleton" circumstance requires us to be careful when
adding elements to instances. Specifically, when adding the first
element: when we detach the strvec instance from the singleton and
set the internal pointer in the instance to NULL. After this point we
apply `realloc()` on the pointer. We do this in
`strvec_push_nodup()`, for example.
The recently introduced `strvec_splice()` API is expected to be
normally used with non-empty strvec's. However, it can also end up
being used with "empty-singleton" strvec's:
struct strvec arr = STRVEC_INIT;
int a = 0, b = 0;
Jonathan Tan [Tue, 3 Dec 2024 21:52:56 +0000 (13:52 -0800)]
index-pack --promisor: also check commits' trees
Commit c08589efdc (index-pack: repack local links into promisor packs,
2024-11-01) seems to contain an oversight in that the tree of a commit
is not checked. Teach git to check these trees.
The fix slows down a fetch from a certain repo at $DAYJOB from 2m2.127s
to 2m45.052s, but in order to make the fetch correct, it seems worth it.
In order to test this, we could create server and client repos as
follows...
C S
\ /
O
(O and C are commits both on the client and server. S is a commit
only on the server. C and S have the same tree but different commit
messages. The diff between O and C is non-zero.)
...and then, from the client, fetch S from the server.
In theory, the client declares "have C" and the server can use this
information to exclude S's tree (since it knows that the client has C's
tree, which is the same as S's tree). However, it is also possible for
the server to compute that it needs to send S and not O, and proceed
from there; therefore the objects of C are not considered at all when
determining what to send in the packfile. In order to prevent a test of
client functionality from having such a dependence on server behavior, I
have not included such a test.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Jonathan Tan [Tue, 3 Dec 2024 21:52:55 +0000 (13:52 -0800)]
index-pack --promisor: don't check blobs
As a follow-up to the parent of this commit, it was found that not
checking for the existence of blobs linked from trees sped up the fetch
from 24m47.815s to 2m2.127s. Teach Git to do that.
The tradeoff of not checking blobs is documented in a code comment.
(Blobs may also be linked from tag objects, but it is impossible to know
the type of an object linked from a tag object without looking it up in
the object database, so the code for that is untouched.)
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Jonathan Tan [Tue, 3 Dec 2024 21:52:54 +0000 (13:52 -0800)]
index-pack --promisor: dedup before checking links
Commit c08589efdc (index-pack: repack local links into promisor packs,
2024-11-01) fixed a bug with what was believed to be a negligible
decrease in performance [1] [2]. But at $DAYJOB, with at least one repo,
it was found that the decrease in performance was very significant.
Looking at the patch, whenever we parse an object in the packfile to
be indexed, we check the targets of all its outgoing links for its
existence. However, this could be optimized by first collecting all such
targets into an oidset (thus deduplicating them) before checking. Teach
Git to do that.
On a certain fetch from the aforementioned repo, this improved
performance from approximately 7 hours to 24m47.815s. This number will
be further reduced in a subsequent patch.
Git documentation refers to $HOME and $XDG_CONFIG_HOME often, but does
not specify how or where these values come from on Windows where neither
is set by default. The new documentation reflects the behavior of
setup_windows_environment() in compat/mingw.c.
Signed-off-by: Alejandro Barreto <alejandro.barreto@ni.com> Signed-off-by: M Hickford <mirth.hickford@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
object-name: fix reversed ordering with ":/<text>" revisions
Recently it was reported [1] that "look for the youngest commit
reachable from any ref with log message that match the given
pattern" syntax (i.e. ':/<text>') started to return results in
reverse recency order. This regression was introduced in Git v2.47.0
and is caused by a memory leak fix done in 57fb139b5e (object-name:
fix leaking commit list items, 2024-08-01).
The intent of the identified commit is to stop modifying the commit list
provided by the caller such that the caller can properly free all commit
list items, including those that the called function might potentially
remove from the list. This was done by creating a copy of the passed-in
commit list and modifying this copy instead of the caller-provided list.
We already knew to create such a copy beforehand with the `backup` list,
which was used to clear the `ONELINE_SEEN` commit mark after we were
done. So the refactoring simply renamed that list to `copy` and started
to operate on that list instead. There is a gotcha though: the backup
list, and thus now also the copied list, is always being prepended to,
so the resulting list is in reverse order! The end result is that we
pop commits from the wrong end of the commit list, returning commits in
reverse recency order.
Junio C Hamano [Fri, 6 Dec 2024 08:08:00 +0000 (17:08 +0900)]
fetch: do not ask for HEAD unnecessarily
In 3f763ddf28 (fetch: set remote/HEAD if it does not exist,
2024-11-22), git-fetch learned to opportunistically set $REMOTE/HEAD
when fetching by always asking for remote HEAD, in the hope that it
will help setting refs/remotes/<name>/HEAD if missing.
But it is not needed to always ask for remote HEAD. When we are
fetching from a remote, for which we have remote-tracking branches,
we do need to know about HEAD. But if we are doing one-shot fetch,
e.g.,
$ git fetch --tags https://github.com/git/git
we do not even know what sub-hierarchy of refs/remotes/<remote>/
we need to adjust the remote HEAD for. There is no need to ask for
HEAD in such a case.
Incidentally, because the unconditional request to list "HEAD"
affected the number of ref-prefixes requested in the ls-remote
request, this affected how the requests for tags are added to the
same ls-remote request, breaking "git fetch --tags $URL" performed
against a URL that is not configured as a remote.
Reported-by: Josh Steadmon <steadmon@google.com>
[jc: tests are also borrowed from Josh's patch] Signed-off-by: Junio C Hamano <gitster@pobox.com>
Karthik Nayak [Fri, 6 Dec 2024 13:13:19 +0000 (14:13 +0100)]
reftable/writer: ensure valid range for log's update_index
Each reftable addition has an associated update_index. While writing
refs, the update_index is verified to be within the range of the
reftable writer, i.e. `writer.min_update_index <= ref.update_index` and
`writer.max_update_index => ref.update_index`.
The corresponding check for reflogs in `reftable_writer_add_log` is
however missing. Add a similar check, but only check for the upper
limit. This is because reflogs are treated a bit differently than refs.
Each reflog entry in reftable has an associated update_index and we also
allow expiring entries in the middle, which is done by simply writing a
new reflog entry with the same update_index. This means, writing reflog
entries with update_index lesser than the writer's update_index is an
expected scenario.
Add a new unit test to check for the limits and fix some of the existing
tests, which were setting arbitrary values for the update_index by
ensuring they stay within the now checked limits.
Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce support for the Meson build system, a "modern" meta build
system that supports many different platforms, including Linux, macOS,
Windows and BSDs. Meson supports different backends, including Ninja,
Xcode and Microsoft Visual Studio. Several common IDEs provide an
integration with it.
The biggest contender compared to Meson is probably CMake as outlined in
our "Documentation/technical/build-systems.txt" file. Based on my own
personal experience from working with both build systems extensively I
strongly favor Meson over CMake. In my opinion, it feels significantly
easier to use with a syntax that feels more like a "real" programming
language. The second big reason is that Meson supports Rust natively,
which may prove to be important given that the project may pick up Rust
as another language eventually.
Using Meson is rather straight-forward. An example:
```
# Meson uses out-of-tree builds. You can set up multiple build
# directories, how you name them is completely up to you.
$ mkdir build
$ cd build
$ meson setup .. -Dprefix=/tmp/git-installation
# Build the project. This also provides several other targets like
e.g. `install` or `test`.
$ ninja
# Meson has been wired up to support execution of our test suites.
# Both our unit tests and our integration tests are supported.
# Running `meson test` without any arguments will execute all tests,
# but the syntax supports globbing to select only some tests.
$ meson test 't-*'
# Execute single test interactively to allow for debugging.
$ meson test 't0000-*' --interactive --test-args=-ix
```
The build instructions have been successfully tested on the following
systems, tests are passing:
- Apple macOS 10.15.
- FreeBSD 14.1.
- NixOS 24.11.
- OpenBSD 7.6.
- Ubuntu 24.04.
- Windows 10 with Cygwin.
- Windows 10 with MinGW64, except for t9700, which is also broken with
our Makefile.
- Windows 10 with Visual Studio 2022 toolchain, using the Native Tools
Command Prompt with `meson setup --vsenv`. Tests pass, except for
t9700.
- Windows 10 with Visual Studio 2022 solution, using the Native Tools
Command Prompt with `meson setup --backend vs2022`. Tests pass,
except for t9700.
- Windows 10 with VS Code, using the Meson plug-in.
It is expected that there will still be rough edges in the current
version. If this patch lands the expectation is that it will coexist
with our other build systems for a while. Like this, distributions can
slowly migrate over to Meson and report any findings they have to us
such that we can continue to iterate. A potential cutoff date for other
build systems may be Git 3.0.
Some notes:
- The installed distribution is structured somewhat differently than
how it used to be the case. All of our binaries are installed into
`$libexec/git-core`, while all binaries part of `$bindir` are now
symbolic links pointing to the former. This rule is consistent in
itself and thus easier to reason about.
- We do not install dashed binaries into `$libexec/git-core` anymore,
so there won't e.g. be a symlink for git-add(1). These are not
required by modern Git and there isn't really much of a use case for
those anymore. By not installing those symlinks we thus start the
deprecation of this layout.
- We're targeting Meson 1.3.0, which has been released relatively
recently November 2023. The only feature we use from that version is
`fs.relative_to()`, which we could replace if necessary. If so, we
could start to target Meson 1.0.0 and newer, released in December
2022.
- The whole build instructions count around 3300 lines, half of which
is listing all of our code and test files. Our Makefiles are around
5000 lines, autoconf adds another 1300 lines. CMake in comparison
has only 1200 linescode, but it avoids listing individual files and
does not wire up auto-configuration as extensively as the Meson
instructions do.
- We bundle a set of subproject wrappers for curl, expat, openssl,
pcre2 and zlib. This allows developers to build Git without these
dependencies preinstalled, and Meson will fetch and build them
automatically. This is especially helpful on Windows.
Helped-by: Eli Schwartz <eschwartz@gentoo.org> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
We're contemplating whether to eventually replace our build systems with
a build system that is easier to use. Add a comparison of build systems
to our technical documentation as a baseline for discussion.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
projects / rit / log