Add a coccinelle rule to break the build when "struct strbuf" gets
passed by value.
* dd/cocci-do-not-pass-strbuf-by-value:
stash: do not pass strbuf by value
coccinelle: detect struct strbuf passed by value
"git diff -U<num>" was too lenient in its command line parsing and
took an empty string as a valid <num>.
* ty/doc-diff-u-wo-number:
diff: document -U without <n> as using default context
Reduce system overhead "git upload-pack" spends on relaying "git
pack-objects" output to the "git fetch" running on the other end of
the connection.
* ps/upload-pack-buffer-more-writes:
builtin/pack-objects: reduce lock contention when writing packfile data
csum-file: drop `hashfd_throughput()`
csum-file: introduce `hashfd_ext()`
sideband: use writev(3p) to send pktlines
wrapper: introduce writev(3p) wrappers
compat/posix: introduce writev(3p) wrapper
upload-pack: reduce lock contention when writing packfile data
upload-pack: prefer flushing data over sending keepalive
upload-pack: adapt keepalives based on buffering
upload-pack: fix debug statement when flushing packfile data
Further work on incremental repacking using MIDX/bitmap
* tb/incremental-midx-part-3.2:
midx: enable reachability bitmaps during MIDX compaction
midx: implement MIDX compaction
t/helper/test-read-midx.c: plug memory leak when selecting layer
midx-write.c: factor fanout layering from `compute_sorted_entries()`
midx-write.c: enumerate `pack_int_id` values directly
midx-write.c: extract `fill_pack_from_midx()`
midx-write.c: introduce `midx_pack_perm()` helper
midx: do not require packs to be sorted in lexicographic order
midx-write.c: introduce `struct write_midx_opts`
midx-write.c: don't use `pack_perm` when assigning `bitmap_pos`
t/t5319-multi-pack-index.sh: fix copy-and-paste error in t5319.39
git-multi-pack-index(1): align SYNOPSIS with 'git multi-pack-index -h'
git-multi-pack-index(1): remove non-existent incompatibility
builtin/multi-pack-index.c: make '--progress' a common option
midx: introduce `midx_get_checksum_hex()`
midx: rename `get_midx_checksum()` to `midx_get_checksum_hash()`
midx: mark `get_midx_checksum()` arguments as const
The final clean-up phase of the diff output could turn the result of
histogram diff algorithm suboptimal, which has been corrected.
* yc/histogram-hunk-shift-fix:
xdiff: re-diff shifted change groups when using histogram algorithm
"git history" learned the "split" subcommand.
* ps/history-split:
builtin/history: implement "split" subcommand
builtin/history: split out extended function to create commits
cache-tree: allow writing in-memory index as tree
add-patch: allow disabling editing of hunks
add-patch: add support for in-memory index patching
add-patch: remove dependency on "add-interactive" subsystem
add-patch: split out `struct interactive_options`
add-patch: split out header from "add-interactive.h"
"git fast-import" learned to optionally replace signature on
commits whose signatures get invalidated due to replaying by
signing afresh.
* jt/fast-import-sign-again:
fast-import: add mode to sign commits with invalid signatures
gpg-interface: allow sign_buffer() to use default signing key
commit: remove unused forward declaration
The logic to count objects has been cleaned up.
* ps/object-counting:
odb: introduce generic object counting
odb/source: introduce generic object counting
object-file: generalize counting objects
object-file: extract logic to approximate object count
packfile: extract logic to count number of objects
odb: stop including "odb/source.h"
We retrieve config values with repo_config_get_string(), which will
allocate a new copy of the string for us. But we don't hold on to those
strings, since they are just fed to git_config_colorbool() and
color_parse(). But nor do we free them, which means they leak.
We can fix this by using the "_tmp" form of repo_config_get_string(),
which just hands us a pointer directly to the internal storage. This is
OK for our purposes, since we don't need it to last for longer than our
parsing calls.
Two interesting side notes here:
1. Many types already have a repo_config_get_X() variant that handles
this for us (e.g., repo_config_get_bool()). But neither colorbools
nor colors themselves have such helpers. We might think about
adding them, but converting all callers is a larger task, and out
of scope for this fix.
2. As far as I can tell, this leak has been there since 960786e761
(push: colorize errors, 2018-04-21), but wasn't detected by LSan in
our test suite. It started triggering when we applied dd3693eb08
(transport-helper, connect: use clean_on_exit to reap children on
abnormal exit, 2026-03-12) which is mostly unrelated.
Even weirder, it seems to trigger only with clang (and not gcc),
and only with GIT_TEST_DEFAULT_REF_FORMAT=reftable. So I think this
is another odd case where the pointers happened to be hanging
around in stack memory, but changing the pattern of function calls
in nearby code was enough for them to be incidentally overwritten.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Replace old-style path existence checks in t4200-rerere.sh with
the appropriate test_path_* helper functions. These helpers provide
clearer diagnostic messages on failure than the raw shell test
builtin.
Signed-off-by: Prashant S Bisht <prashantjee2025@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The "large exclude file ignored in tree" test fails. This is due to an
additional warning message that is generated in the test. "warning:
unable to access 'subdir/.gitignore': Too many levels of symbolic
links", the extra warning that is not supposed to be there, happens
because of some leftover files left by previous tests.
To fix this we improve cleanup on "symlinks not respected in-tree", and
because the tests in t0008 in general have poor cleanup, at the start of
"large exclude file ignored in tree" we search for any leftover
.gitignore and remove them before starting the test.
Improve post-test cleanup and add pre-test cleanup to make sure that we
have a workable environment for the test.
Signed-off-by: Mirko Faina <mroik@delayed.space>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"imap-send" used to use functions whose use is going to be removed
with OpenSSL 4.0; rewrite them using public API that has been
available since OpenSSL 1.1 since 2016 or so.
* bb/imap-send-openssl-4.0-prep:
imap-send: move common code into function host_matches()
imap-send: use the OpenSSL API to access the subject common name
imap-send: use the OpenSSL API to access the subject alternative names
The code in "git help" that shows configuration items in sorted
order was awkwardly organized and prone to bugs.
* ac/help-sort-correctly:
help: cleanup the contruction of keys_uniq
Instead of hardcoded 'origin', use the configured default remote
when fetching from submodules.
* ng/submodule-default-remote:
submodule: fetch missing objects from default remote
In-code comment update to record a design decision to allow lazy
computation of patch IDs.
* ty/patch-ids-document-lazy-eval:
patch-ids: document intentional const-casting in patch_id_neq()
Plug a few leaks where mmap'ed memory regions are not unmapped.
* jk/unleak-mmap:
meson: turn on NO_MMAP when building with LSan
Makefile: turn on NO_MMAP when building with LSan
object-file: fix mmap() leak in odb_source_loose_read_object_stream()
pack-revindex: avoid double-loading .rev files
check_connected(): fix leak of pack-index mmap
check_connected(): delay opening new_pack
While discovering a ".git" directory, the code treats any stat()
failure as a sign that a filesystem entity .git does not exist
there, and ignores ".git" that is not a "gitdir" file or a
directory. The code has been tightened to notice and report
filesystem corruption better.
* ty/setup-error-tightening:
setup: improve error diagnosis for invalid .git files
The construct 'test "$(command)" = expectation' loses the exit
status from the command, which has been fixed by breaking up the
statement into pieces.
* fp/t3310-unhide-git-failures:
t3310: avoid hiding failures from rev-parse in command substitutions
"git repo structure" command learns to report maximum values on
various aspects of objects it inspects.
* jt/repo-structure-extrema:
builtin/repo: find tree with most entries
builtin/repo: find commit with most parents
builtin/repo: add OID annotations to table output
builtin/repo: collect largest inflated objects
builtin/repo: add helper for printing keyvalue output
builtin/repo: update stats for each object
Reduce dependence on the global the_hash_algo and the_repository
variables of wt-status code path.
* sp/wt-status-wo-the-repository:
wt-status: use hash_algo from local repository instead of global the_hash_algo
wt-status: replace uses of the_repository with local repository instances
wt-status: pass struct repository through function parameters
The example provided has its arguments in the wrong order. The revision
should follow the pattern, and not the other way around.
Signed-off-by: Guillaume Jacob <guillaume@absolut-sensing.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Update clar to e4172e3 (Merge pull request #134 from
clar-test/ethomson/const, 2026-01-10). Besides some changes to
"generate.py" which don't have any impact on us, this commit also fixes
compilation on platforms that don't have PATH_MAX, like for example
GNU/Hurd.
Reported-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
save_untracked_files() takes its 'files' parameter as struct strbuf
by value. Passing a strbuf by value copies the struct but shares
the underlying buffer between caller and callee, risking a dangling
pointer and double-free if the callee reallocates.
The function needs both the buffer and its length for
pipe_command(), so a plain const char * is not sufficient here.
Switch the parameter to struct strbuf * and update the caller to
pass a pointer.
Signed-off-by: Deveshi Dwivedi <deveshigurgaon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Passing a struct strbuf by value to a function copies the struct
but shares the underlying character array between caller and callee.
If the callee causes a reallocation, the caller's copy becomes a
dangling pointer, leading to a double-free when strbuf_release() is
called. There is no coccinelle rule to catch this pattern.
Jeff King suggested adding one during review of the
write_worktree_linking_files() fix [1], and noted that a reporting
rule using coccinelle's Python scripting extensions could emit a
descriptive warning, but we do not currently require Python support
in coccinelle.
Add a transformation rule that rewrites a by-value strbuf parameter
to a pointer. The detection is identical to what a Python-based
reporting rule would catch; only the presentation differs. The
resulting diff will not produce compilable code on its own (callers
and the function body still need updating), but the spatch output
alerts the developer that the signature needs attention. This is
consistent with the other rules in strbuf.cocci, which also rewrite
to the preferred form.
[1] https://lore.kernel.org/git/20260309192600.GC309867@coredump.intra.peff.net/
Signed-off-by: Deveshi Dwivedi <deveshigurgaon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The pack-refs tests previously used raw 'test -f' and 'test -e' checks
with negation. Update them to use Git's standard helper function
test_path_is_missing for consistency and clearer failure reporting.
As suggested in review, replaced the negated 'test_path_exists' with
test_path_is_missing to better reflect the expected absence of paths.
Signed-off-by: Ritesh Singh Jadoun <riteshjd75@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The unit test helper function was taught to use backslash +
mneomnic notation for certain control characters like "\t", instead
of octal notation like "\011".
* ps/unit-test-c-escape-names.txt:
test-lib: print escape sequence names
Small code clean-up around constness area.
* cf/constness-fixes:
dir: avoid -Wdiscarded-qualifiers in remove_path()
bloom: remove a misleading const qualifier
Try to resurrect and reboot a stalled "avoid sending risky escape
sequences taken from sideband to the terminal" topic by Dscho. The
plan is to keep it in 'next' long enough to see if anybody screams
with the "everything dropped except for ANSI color escape sequence"
default.
* jc/neuter-sideband-fixup:
sideband: drop 'default' configuration
sideband: offer to configure sanitizing on a per-URL basis
sideband: add options to allow more control sequences to be passed through
sideband: do allow ANSI color sequences by default
sideband: introduce an "escape hatch" to allow control characters
sideband: mask control characters
When running `git pack-objects --stdout` we feed the data through
`hashfd_ext()` with a progress meter and a smaller-than-usual buffer
length of 8kB so that we can track throughput more granularly. But as
packfiles tend to be on the larger side, this small buffer size may
cause a ton of write(3p) syscalls.
Originally, the buffer we used in `hashfd()` was 8kB for all use cases.
This was changed though in 2ca245f8be (csum-file.h: increase hashfile
buffer size, 2021-05-18) because we noticed that the number of writes
can have an impact on performance. So the buffer size was increased to
128kB, which improved performance a bit for some use cases.
But the commit didn't touch the buffer size for `hashd_throughput()`.
The reasoning here was that callers expect the progress indicator to
update frequently, and a larger buffer size would of course reduce the
update frequency especially on slow networks.
While that is of course true, there was (and still is, even though it's
now a call to `hashfd_ext()`) only a single caller of this function in
git-pack-objects(1). This command is responsible for writing packfiles,
and those packfiles are often on the bigger side. So arguably:
- The user won't care about increments of 8kB when packfiles tend to
be megabytes or even gigabytes in size.
- Reducing the number of syscalls would be even more valuable here
than it would be for multi-pack indices, which was the benchmark
done in the mentioned commit, as MIDXs are typically significantly
smaller than packfiles.
- Nowadays, many internet connections should be able to transfer data
at a rate significantly higher than 8kB per second.
Update the buffer to instead have a size of `LARGE_PACKET_DATA_MAX - 1`,
which translates to ~64kB. This limit was chosen because `git
pack-objects --stdout` is most often used when sending packfiles via
git-upload-pack(1), where packfile data is chunked into pktlines when
using the sideband. Furthermore, most internet connections should have a
bandwidth signifcantly higher than 64kB/s, so we'd still be able to
observe progress updates at a rate of at least once per second.
This change significantly reduces the number of write(3p) syscalls from
355,000 to 44,000 when packing the Linux repository. While this results
in a small performance improvement on an otherwise-unused system, this
improvement is mostly negligible. More importantly though, it will
reduce lock contention in the kernel on an extremely busy system where
we have many processes writing data at once.
Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The `hashfd_throughput()` function is used by a single callsite in
git-pack-objects(1). In contrast to `hashfd()`, this function uses a
progress meter to measure throughput and a smaller buffer length so that
the progress meter can provide more granular metrics.
We're going to change that caller in the next commit to be a bit more
specific to packing objects. As such, `hashfd_throughput()` will be a
somewhat unfitting mechanism for any potential new callers.
Drop the function and replace it with a call to `hashfd_ext()`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce a new `hashfd_ext()` function that takes an options structure.
This function will replace `hashd_throughput()` in the next commit.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano