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With respect to symlinks, the current `mingw_stat()` implementation is
almost identical to `mingw_lstat()`: except for the file type (`st_mode
& S_IFMT`), it returns information about the link rather than the target.
Implement `mingw_stat()` by opening the file handle requesting minimal
permissions, and then calling `GetFileInformationByHandle()` on it. This
way, all links are resolved by the Windows file system layer.
Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The Win32 API function `GetFileAttributes()` cannot handle paths with
trailing dir separators. The current `mingw_stat()`/`mingw_lstat()`
implementation calls `GetFileAttributes()` twice if the path has
trailing slashes (first with the original path that was passed as
function parameter, and and a second time with a path copy with trailing
'/' removed).
With the conversion to wide Unicode, we get the length of the path for
free, and also have a (wide char) buffer that can be modified. This
makes it easy to avoid that extraneous Win32 API call.
Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* js/prep-symlink-windows:
trim_last_path_component(): avoid hard-coding the directory separator
strbuf_readlink(): support link targets that exceed 2*PATH_MAX
strbuf_readlink(): avoid calling `readlink()` twice in corner-cases
init: do parse _all_ core.* settings early
mingw: do resolve symlinks in `getcwd()`
t7800: work around the MSYS path conversion on Windows
t6423: introduce Windows-specific handling for symlinking to /dev/null
t1305: skip symlink tests that do not apply to Windows
t1006: accommodate for symlink support in MSYS2
t0600: fix incomplete prerequisite for a test case
t0301: another fix for Windows compatibility
t0001: handle `diff --no-index` gracefully
mingw: special-case `open(symlink, O_CREAT | O_EXCL)`
apply: symbolic links lack a "trustable executable bit"
t9700: accommodate for Windows paths
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Currently, this function hard-codes the directory separator as the
forward slash.
However, on Windows the backslash character is valid, too. And we want
to call this function in the upcoming support for symlinks on Windows
with the symlink targets (which naturally use the canonical directory
separator on Windows, which is _not_ the forward slash).
Prepare that function to be useful also in that context.
Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `strbuf_readlink()` function refuses to read link targets that
exceed 2*PATH_MAX (even if a sufficient size was specified by the
caller).
The reason that that limit is 2*PATH_MAX instead of PATH_MAX is that
the symlink targets do not need to be normalized. After running
`ln -s a/../a/../a/../a/../b c`, the target of the symlink `c` will not
be normalized to `b` but instead be much longer. As such, symlink
targets' lengths can far exceed PATH_MAX.
They are frequently much longer than 2*PATH_MAX on Windows, which
actually supports paths up to 32,767 characters, but sets PATH_MAX to
260 for backwards compatibility. For full details, see
https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
Let's just hard-code the limit used by `strbuf_readlink()` to 32,767 and
make it independent of the current platform's PATH_MAX.
Based-on-a-patch-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `strbuf_readlink()` function calls `readlink()`` twice if the hint
argument specifies the exact size of the link target (e.g. by passing
stat.st_size as returned by `lstat()`). This is necessary because
`readlink(..., hint) == hint` could mean that the buffer was too small.
Use `hint + 1` as buffer size to prevent this.
Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In Git for Windows, `has_symlinks` is set to 0 by default. Therefore, we
need to parse the config setting `core.symlinks` to know if it has been
set to `true`. In `git init`, we must do that before copying the
templates because they might contain symbolic links.
Even if the support for symbolic links on Windows has not made it to
upstream Git yet, we really should make sure that all the `core.*`
settings are parsed before proceeding, as they might very well change
the behavior of `git init` in a way the user intended.
This fixes https://github.com/git-for-windows/git/issues/3414
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As pointed out in https://github.com/git-for-windows/git/issues/1676,
the `git rev-parse --is-inside-work-tree` command currently fails when
the current directory's path contains symbolic links.
The underlying reason for this bug is that `getcwd()` is supposed to
resolve symbolic links, but our `mingw_getcwd()` implementation did not.
We do have all the building blocks for that, though: the
`GetFinalPathByHandleW()` function will resolve symbolic links. However,
we only called that function if `GetLongPathNameW()` failed, for
historical reasons: the latter function was supported for a long time,
but the former API function was introduced only with Windows Vista, and
we used to support also Windows XP. With that support having been
dropped, we are free to call the symbolic link-resolving function right
away.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* js/test-symlink-windows:
t7800: work around the MSYS path conversion on Windows
t6423: introduce Windows-specific handling for symlinking to /dev/null
t1305: skip symlink tests that do not apply to Windows
t1006: accommodate for symlink support in MSYS2
t0600: fix incomplete prerequisite for a test case
t0301: another fix for Windows compatibility
t0001: handle `diff --no-index` gracefully
mingw: special-case `open(symlink, O_CREAT | O_EXCL)`
apply: symbolic links lack a "trustable executable bit"
t9700: accommodate for Windows paths
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Git's test suite's relies on Unix shell scripting, which is
understandable, of course, given Git's firm roots (and indeed, ongoing
focus) on Linux.
This fact, combined with Unix shell scripting's natural
habitat -- which is, naturally... *drumroll*... Unix --
often has unintended side effects, where developers expect the test
suite to run in a Unix environment, which is an incorrect assumption.
One instance of this problem can be observed in the 'difftool --dir-diff
handles modified symlinks' test case in `t7800-difftool.sh`, which
assumes that all absolute paths start with a forward slash. That
assumption is incorrect in general, e.g. on Windows, where absolute
paths have many shapes and forms, none of which starts with a forward
slash.
The only saving grace is that this test case is currently not run on
Windows because of the `SYMLINK` prerequisite. However, I am currently
working towards upstreaming symbolic link support from Git for Windows
to upstream Git, which will put a crack into that saving grace.
Let's change that test case so that it does not rely on absolute paths
(which are passed to the "external command" `ls` as parameters and are
therefore part of its output, and which the test case wants to filter
out before verifying that the output is as expected) starting with a
forward slash. Let's instead rely on the much more reliable fact that
`ls` will output the path in a line that ends in a colon, and simply
filter out those lines by matching said colon instead.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The device `/dev/null` does not exist on Windows, it's called `NUL`
there. Calling `ln -s /dev/null my-symlink` in a symlink-enabled MSYS2
Bash will therefore literally link to a file or directory called `null`
that is supposed to be in the current drive's top-level `dev` directory.
Which typically does not exist.
The test, however, really wants the created symbolic link to point to
the NUL device. Let's instead use the `mklink` utility on Windows to
perform that job, and keep using `ln -s /dev/null <target>` on
non-Windows platforms.
While at it, add the missing `SYMLINKS` prereq because this test _still_
would not pass on Windows before support for symbolic links is
upstreamed from Git for Windows.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In Git for Windows, the gitdir is canonicalized so that even when the
gitdir is specified via a symbolic link, the `gitdir:` conditional
include will only match the real directory path.
Unfortunately, t1305 codifies a different behavior in two test cases,
which are hereby skipped on Windows.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The MSYS2 runtime (which inherits this trait from the Cygwin runtime,
and which is used by Git for Windows' Bash to emulate POSIX
functionality on Windows, the same Bash that is also used to run Git's
test suite on Windows) has a mode where it can create native symbolic
links on Windows.
Naturally, this is a bit of a strange feature, given that Cygwin goes
out of its way to support Unix-like paths even if no Win32 program
understands those, and the symbolic links have to use Win32 paths
instead (which Win32 programs understand very well).
As a consequence, the symbolic link targets get normalized before the
links are created.
This results in certain quirks that Git's test suite is ill equipped to
accommodate (because Git's test suite expects to be able to use
Unix-like paths even on Windows).
The test script t1006-cat-file.sh contains two prime examples, two test
cases that need to skip a couple assertions because they are simply
wrong in the context of Git for Windows.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The 'symref transaction supports symlinks' test case is guarded by the
`SYMLINK` prerequisite because `core.prefersymlinkrefs = true` requires
symbolic links to be supported.
However, the `preferSymlinkRefs` feature is not supported on Windows,
therefore this test case needs the `MINGW` prerequisite, too.
There's a couple more cases where we set this config key:
- In a subsequent test in t0600, but there we explicitly set it to
"false". So this would naturally be supported by Windows.
- In t7201 we set the value to `yes`, but we never verify that the
written reference is a symbolic link in the first place. I guess
that we could rather remove setting the configuration value here, as
we are about to deprecate support for symrefs via symbolic links in
the first place. But that's certainly outside of the scope of this
patch.
- In t9903 we do the same, but likewise, we don't check whether the
written file is a symbolic link.
Therefore this seems to be the only instance where the tests actually
need to be adapted.
Helped-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Just like 0fdcfa2f9f5 (t0301: fixes for windows compatibility,
2021-09-14) explained, we should not call `mkdir -m<mode>` in the test
suite because that would fail on Windows.
There was one forgotten instance of this which was hidden by a `SYMLINK`
prerequisite. Currently, this prevents this test case from being
executed on Windows, but with the upcoming support for symbolic links,
it would become a problem.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The test case 're-init to move gitdir symlink' wants to compare the
contents of `newdir/.git`, which is a symbolic link pointing to a file.
However, `git diff --no-index`, which is used by `test_cmp` on Windows,
does not resolve symlinks; It shows the symlink _target_ instead (with a
file mode of 120000). That is totally unexpected by the test case, which
as a consequence fails, meaning that it's a bug in the test case itself.
Co-authored-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `_wopen()` function would gladly follow a symbolic link to a
non-existent file and create it when given above-mentioned flags.
Git expects the `open()` call to fail, though. So let's add yet another
work-around to pretend that Windows behaves according to POSIX, see:
https://pubs.opengroup.org/onlinepubs/007904875/functions/open.html#:~:text=If%20O_CREAT%20and%20O_EXCL%20are,set%2C%20the%20result%20is%20undefined.
This is required to let t4115.8(--reject removes .rej symlink if it
exists) pass on Windows when enabling the MSYS2 runtime's symbolic link
support.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When 0482c32c334b (apply: ignore working tree filemode when
!core.filemode, 2023-12-26) fixed `git apply` to stop warning about
executable files, it inadvertently changed the code flow also for
symbolic links and directories.
Let's narrow the scope of the special `!trust_executable_git` code path
to apply only to regular files.
This is needed to let t4115.5(symlink escape when creating new files)
pass on Windows when symbolic link support is enabled in the MSYS2
runtime.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Ever since fe53bbc9beb (Git.pm: Always set Repository to absolute path
if autodetecting, 2009-05-07), the t9700 test _must_ fail on Windows
because of that age-old Unix paths vs Windows paths problem.
The underlying root cause is that Git cannot run with a regular Win32
variant of Perl, the assumption that every path is a Unix path is just
too strong in Git's Perl code.
As a consequence, Git for Windows is basically stuck with using the
MSYS2 variant of Perl which uses a POSIX emulation layer (which is a
friendly fork of Cygwin) _and_ a best-effort Unix <-> Windows paths
conversion whenever crossing the boundary between MSYS2 and regular
Win32 processes. It is best effort only, though, using heuristics to
automagically convert correctly in most cases, but not in all cases.
In the context of this here patch, this means that asking `git.exe` for
the absolute path of the `.git/` directory will return a Win32 path
because `git.exe` is a regular Win32 executable that has no idea about
Unix-ish paths. But above-mentioned commit introduced a test that wants
to verify that this path is identical to the one that the Git Perl
module reports (which refuses to use Win32 paths and uses Unix-ish paths
instead). Obviously, this must fail because no heuristics can kick in at
that layer.
This test failure has not even been caught when Git introduced Windows
support in its CI definition in 2e90484eb4a (ci: add a Windows job to
the Azure Pipelines definition, 2019-01-29), as all tests relying on
Perl had to be disabled even from the start (because the CI runs would
otherwise have resulted in prohibitively long runtimes, not because
Windows is super slow per se, but because Git's test suite keeps
insisting on using technology that requires a POSIX emulation layer,
which _is_ super slow on Windows).
To work around this failure, let's use the `cygpath` utility to convert
the absolute `gitdir` path into the form that the Perl code expects.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Docfix.
* kh/doc-send-email-paragraph-fix:
doc: send-email: fix broken list continuation
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Docfix.
* mh/doc-config-gui-gcwarning:
config: document 'gui.GCWarning'
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Docfix.
* kh/doc-pre-commit-fix:
doc: join default pre-commit paragraphs
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Leakfix.
* jc/capability-leak:
connect: plug protocol capability leak
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Rewrite the only use of "mktemp()" that is subject to TOCTOU race
and Stop using the insecure "mktemp()" function.
* rs/ban-mktemp:
compat: remove gitmkdtemp()
banned.h: ban mktemp(3)
compat: remove mingw_mktemp()
compat: use git_mkdtemp()
wrapper: add git_mkdtemp()
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Emulation code clean-up.
* gf/win32-pthread-cond-init:
win32: pthread_cond_init should return a value
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The "git_istream" abstraction has been revamped to make it easier
to interface with pluggable object database design.
* ps/object-read-stream:
streaming: drop redundant type and size pointers
streaming: move into object database subsystem
streaming: refactor interface to be object-database-centric
streaming: move logic to read packed objects streams into backend
streaming: move logic to read loose objects streams into backend
streaming: make the `odb_read_stream` definition public
streaming: get rid of `the_repository`
streaming: rely on object sources to create object stream
packfile: introduce function to read object info from a store
streaming: move zlib stream into backends
streaming: create structure for filtered object streams
streaming: create structure for packed object streams
streaming: create structure for loose object streams
streaming: create structure for in-core object streams
streaming: allocate stream inside the backend-specific logic
streaming: explicitly pass packfile info when streaming a packed object
streaming: propagate final object type via the stream
streaming: drop the `open()` callback function
streaming: rename `git_istream` into `odb_read_stream`
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Docfix.
* je/doc-data-model:
doc: remove stray text in Git data model
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"git repo struct" learned to take "-z" as a synonym to "--format=nul".
* lo/repo-struct-z:
repo: add -z as an alias for --format=nul to git-repo-structure
repo: use [--format=... | -z] instead of [-z] in git-repo-info synopsis
repo: remove blank line from Documentation/git-repo.adoc
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A help message from "git branch" now mentions "git help" instead of
"man" when suggesting to read some documentation.
* kh/advise-w-git-help-in-branch:
branch: advice using git-help(1) instead of man(1)
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Doc fixup.
* je/doc-pull:
doc: git-pull: fix 'git --rebase abort' typo
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Build fix.
* tc/meson-cross-compile-fix:
meson: use is_cross_build() where possible
meson: only detect ICONV_OMITS_BOM if possible
meson: ignore subprojects/.wraplock
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"git last-modified" used to mishandle "--" to mark the beginning of
pathspec, which has been corrected.
* js/last-modified-with-sparse-checkouts:
last-modified: support sparse checkouts
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Halve the memory consumed by artificial filepairs created during
"git diff --find-copioes-harder", also making the operation run
faster.
* rs/diff-index-find-copies-harder-optim:
diff-index: don't queue unchanged filepairs with diff_change()
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Recent optimization to "last-modified" command introduced use of
uninitialized block of memory, which has been corrected.
* tc/last-modified-active-paths-optimization:
last-modified: fix use of uninitialized memory
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The use of "revision" (a connected set of commits) has been
clarified in the "git replay" documentation.
* en/replay-doc-revision-range:
Documentation/git-replay.adoc: fix errors around revision range
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The way patience diff finds LCS has been optimized.
* yc/xdiff-patience-optim:
xdiff: optimize patience diff's LCS search
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A few tests have been updated to work under the shell compatible
mode of zsh.
* bc/zsh-testsuite:
t5564: fix test hang under zsh's sh mode
t0614: use numerical comparison with test_line_count
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"git replay" forgot to omit the "gpgsig-sha256" extended header
from the resulting commit the same way it omits "gpgsig", which has
been corrected.
* pw/replay-exclude-gpgsig-fix:
replay: do not copy "gpgsign-sha256" header
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While investigating the config options set by 'scalar' I noticed this
one wasn't documented.
Signed-off-by: Matthew Hughes <matthewhughes934@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The list continuation has to be “immediately adjacent to the block
being attached”.[1]
[1]: https://web.archive.org/web/20251208172615/https://docs.asciidoctor.org/asciidoc/latest/lists/continuation/
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When pushing to a set of remotes using a nickname for the group, the
client initializes the connection to each remote, talks to the
remote and reads and parses capabilities line, and holds the
capabilities in a file-scope static variable server_capabilities_v1.
There are a few other such file-scope static variables, and these
connections cannot be parallelized until they are refactored to a
structure that keeps track of active connections.
Which is *not* the theme of this patch ;-)
For a single connection, the server_capabilities_v1 variable is
initialized to NULL (at the program initialization), populated when
we talk to the other side, used to look up capabilities of the other
side possibly multiple times, and the memory is held by the variable
until program exit, without leaking. When talking to multiple remotes,
however, the server capabilities from the second connection overwrites
without freeing the one from the first connection, which leaks.
==1080970==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 421 byte(s) in 2 object(s) allocated from:
#0 0x5615305f849e in strdup (/home/gitster/g/git-jch/bin/bin/git+0x2b349e) (BuildId: 54d149994c9e85374831958f694bd0aa3b8b1e26)
#1 0x561530e76cc4 in xstrdup /home/gitster/w/build/wrapper.c:43:14
#2 0x5615309cd7fa in process_capabilities /home/gitster/w/build/connect.c:243:27
#3 0x5615309cd502 in get_remote_heads /home/gitster/w/build/connect.c:366:4
#4 0x561530e2cb0b in handshake /home/gitster/w/build/transport.c:372:3
#5 0x561530e29ed7 in get_refs_via_connect /home/gitster/w/build/transport.c:398:9
#6 0x561530e26464 in transport_push /home/gitster/w/build/transport.c:1421:16
#7 0x561530800bec in push_with_options /home/gitster/w/build/builtin/push.c:387:8
#8 0x5615307ffb99 in do_push /home/gitster/w/build/builtin/push.c:442:7
#9 0x5615307fe926 in cmd_push /home/gitster/w/build/builtin/push.c:664:7
#10 0x56153065673f in run_builtin /home/gitster/w/build/git.c:506:11
#11 0x56153065342f in handle_builtin /home/gitster/w/build/git.c:779:9
#12 0x561530655b89 in run_argv /home/gitster/w/build/git.c:862:4
#13 0x561530652cba in cmd_main /home/gitster/w/build/git.c:984:19
#14 0x5615308dda0a in main /home/gitster/w/build/common-main.c:9:11
#15 0x7f051651bca7 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
SUMMARY: AddressSanitizer: 421 byte(s) leaked in 2 allocation(s).
Free the capablities data for the previous server before overwriting
it with the next server to plug this leak.
The added test fails without the freeing with SANITIZE=leak; I
somehow couldn't get it fail reliably with SANITIZE=leak,address
though.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Join two paragraphs that start with the standard “The default <hook>,
when enabled” into one and put it at the end of the “pre-commit”
section.
The trailing whitespace paragraph was added in the first commit for the
doc, in 6d35cc76 (Document hooks., 2005-09-02). Then 3e14dd2c (mention
use of "hooks.allownonascii" in "man githooks", 2019-02-20) updated the
“pre-commit” section to mention the non-ASCII check that was added in
d00e364d.[1] But this paragraph was added one-past the original
“default” paragraph, after the env. variable paragraph, and starts
exactly the same. That causes the flow of this section to feel
off (paragraphs in order):
1. Invoked by <cmd> and what parameters it takes
2. The default 'pre-commit' hook catches introduction of trailing
whitespace
3. `GIT_EDITOR=:`
4. The default pre-commit' hook catches introduction of non-ASCII
filenames
Let’s instead join these two paragrahs and explain the whole behavior of
the default script.
† 1: Extend sample pre-commit hook to check for non ascii filenames,
2009-05-19
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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gitmkdtemp() has become a trivial wrapper around git_mkdtemp(). Remove
this now unnecessary layer of indirection.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Older versions of mktemp(3) generate easily guessable file names. The
function checks if the generated name is used, which is unreliable, as
a file with that name might then be created by some other process before
we can do it ourselves. The function was dropped from POSIX due to its
security problems. Forbid its use.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove the mktemp(3) compatibility function now that its last caller was
removed by the previous commit.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A file might appear at the path returned by mktemp(3) before we call
mkdir(2). Use the more robust git_mkdtemp() instead, which retries a
number of times and doesn't need to call lstat(2).
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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