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Newer regex library macOS stopped enabling GNU-like enhanced BRE,
where '\(A\|B\)' works as alternation, unless explicitly asked with
the REG_ENHANCED flag. "git grep" now can be compiled to do so, to
retain the old behaviour.
* rs/use-enhanced-bre-on-macos:
use enhanced basic regular expressions on macOS
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Code cleaning.
* rs/dup-array:
use DUP_ARRAY
add DUP_ARRAY
do full type check in BARF_UNLESS_COPYABLE
factor out BARF_UNLESS_COPYABLE
mingw: make argv2 in try_shell_exec() non-const
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Add a macro for allocating and populating a shallow copy of an array.
It is intended to replace a sequence like this:
ALLOC_ARRAY(dst, n);
COPY_ARRAY(dst, src, n);
With the less repetitve:
DUP_ARRAY(dst, src, n);
It checks whether the types of source and destination are compatible to
ensure the copy can be used safely.
An easier alternative would be to only consider the source and return
a void pointer, that could be used like this:
dst = ARRAY_DUP(src, n);
That would be more versatile, as it could be used in declarations as
well. Making it type-safe would require the use of typeof_unqual from
C23, though.
So use the safe and compatible variant for now.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Use __builtin_types_compatible_p to perform a full type check if
possible. Otherwise fall back to the old size comparison, but add a
non-evaluated assignment to catch more type mismatches. It doesn't flag
copies between arrays with different signedness, but that's as close to
a full type check as it gets without the builtin, as far as I can see.
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Move the common basic element type check of COPY_ARRAY and MOVE_ARRAY to
a new macro. This reduces code duplication and simplifies adding more
elaborate checks.
Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When 1819ad327b (grep: fix multibyte regex handling under macOS,
2022-08-26) started to use the native regex library instead of Git's
own (compat/regex/), it lost support for alternation in basic
regular expressions.
Bring it back by enabling the flag REG_ENHANCED on macOS when
compiling basic regular expressions.
Reported-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Redefining system functions for a few functions did not follow our
usual "implement git_foo() and #define foo(args) git_foo(args)"
pattern, which has broken build for some folks.
* jk/avoid-redef-system-functions-2.30:
git-compat-util: undefine system names before redeclaring them
git-compat-util: avoid redefining system function names
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The `%w(width,indent1,indent2)` formatting directive can be used to
rewrap text to a specific width and is designed after git-shortlog(1)'s
`-w` parameter. While the three parameters are all stored as `size_t`
internally, `strbuf_add_wrapped_text()` accepts integers as input. As a
result, the casted integers may overflow. As these now-negative integers
are later on passed to `strbuf_addchars()`, we will ultimately run into
implementation-defined behaviour due to casting a negative number back
to `size_t` again. On my platform, this results in trying to allocate
9000 petabyte of memory.
Fix this overflow by using `cast_size_t_to_int()` so that we reject
inputs that cannot be represented as an integer.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we define a macro to point a system function (e.g., flockfile) to
our custom wrapper, we should make sure that the system did not already
define it as a macro. This is rarely a problem, but can cause
compilation failures if both of these are true:
- we decide to define our own wrapper even though the system provides
the function; we know this happens at least with uclibc, which may
declare flockfile, etc, without _POSIX_THREAD_SAFE_FUNCTIONS
- the system version is declared as a macro; we know this happens at
least with uclibc's version of getc_unlocked()
So just handling getc_unlocked() would be sufficient to deal with the
real-world case we've seen. But since it's easy to do, we may as well be
defensive about the other macro wrappers added in the previous patch.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Our git-compat-util header defines a few noop wrappers for system
functions if they are not available. This was originally done with a
macro, but in 15b52a44e0 (compat-util: type-check parameters of no-op
replacement functions, 2020-08-06) we switched to inline functions,
because it gives us basic type-checking.
This can cause compilation failures when the system _does_ declare those
functions but we choose not to use them, since the compiler will
complain about the redeclaration. This was seen in the real world when
compiling against certain builds of uclibc, which may leave
_POSIX_THREAD_SAFE_FUNCTIONS unset, but still declare flockfile() and
funlockfile().
It can also be seen on any platform that has setitimer() if you choose
to compile without it (which plausibly could happen if the system
implementation is buggy). E.g., on Linux:
$ make NO_SETITIMER=IWouldPreferNotTo git.o
CC git.o
In file included from builtin.h:4,
from git.c:1:
git-compat-util.h:344:19: error: conflicting types for ‘setitimer’; have ‘int(int, const struct itimerval *, struct itimerval *)’
344 | static inline int setitimer(int which UNUSED,
| ^~~~~~~~~
In file included from git-compat-util.h:234:
/usr/include/x86_64-linux-gnu/sys/time.h:155:12: note: previous declaration of ‘setitimer’ with type ‘int(__itimer_which_t, const struct itimerval * restrict, struct itimerval * restrict)’
155 | extern int setitimer (__itimer_which_t __which,
| ^~~~~~~~~
make: *** [Makefile:2714: git.o] Error 1
Here I think the compiler is complaining about the lack of "restrict"
annotations in our version, but even if we matched it completely (and
there is no way to match all platforms anyway), it would still complain
about a static declaration following a non-static one. Using macros
doesn't have this problem, because the C preprocessor rewrites the name
in our code before we hit this level of compilation.
One way to fix this would just be to revert most of 15b52a44e0. What we
really cared about there was catching build problems with
precompose_argv(), which most platforms _don't_ build, and which is our
custom function. So we could just switch the system wrappers back to
macros; most people build the real versions anyway, and they don't
change. So the extra type-checking isn't likely to catch bugs.
But with a little work, we can have our cake and eat it, too. If we
define the type-checking wrappers with a unique name, and then redirect
the system names to them with macros, we still get our type checking,
but without redeclaring the system function names.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Compilation fix for ancient compilers.
* ab/unused-annotation:
git-compat-util.h: GCC deprecated message arg only in GCC 4.5+
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More UNUSED annotation to help using -Wunused option with the
compiler.
* jk/unused-anno-more:
ll-merge: mark unused parameters in callbacks
diffcore-pickaxe: mark unused parameters in pickaxe functions
convert: mark unused parameter in null stream filter
apply: mark unused parameters in noop error/warning routine
apply: mark unused parameters in handlers
date: mark unused parameters in handler functions
string-list: mark unused callback parameters
object-file: mark unused parameters in hash_unknown functions
mark unused parameters in trivial compat functions
update-index: drop unused argc from do_reupdate()
submodule--helper: drop unused argc from module_list_compute()
diffstat_consume(): assert non-zero length
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When a platform feature isn't available or in use, we sometimes
conditionally compile empty or trivial functions to turn these into
noops. We need to annotate their parameters so that -Wunused-parameters
won't complain about them.
Note that there are many more of these in compat/mingw.h, but we'll
leave them for now, as there's some trickery required to get the UNUSED
macro available there.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Compilation fix for ancient compilers.
* ab/unused-annotation:
git-compat-util.h: GCC deprecated message arg only in GCC 4.5+
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With a bit of header twiddling, use the native regexp library on
macOS instead of the compat/ one.
* ds/use-platform-regex-on-macos:
grep: fix multibyte regex handling under macOS
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https://gcc.gnu.org/gcc-4.5/changes.html says
The deprecated attribute now takes an optional string argument, for
example, __attribute__((deprecated("text string"))), that will be
printed together with the deprecation warning.
While GCC 4.5 is already 12 years old, git checks for even older
versions in places. Let's not needlessly break older compilers when
a small and simple fix is readily available.
Signed-off-by: Alejandro R. Sedeño <asedeno@mit.edu>
Signed-off-by: Alejandro R Sedeño <asedeno@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Undoes 'jk/unused-annotation' topic and redoes it to work around
Coccinelle rules misfiring false positives in unrelated codepaths.
* ab/unused-annotation:
git-compat-util.h: use "deprecated" for UNUSED variables
git-compat-util.h: use "UNUSED", not "UNUSED(var)"
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Annotate function parameters that are not used (but cannot be
removed for structural reasons), to prepare us to later compile
with -Wunused warning turned on.
* jk/unused-annotation:
is_path_owned_by_current_uid(): mark "report" parameter as unused
run-command: mark unused async callback parameters
mark unused read_tree_recursive() callback parameters
hashmap: mark unused callback parameters
config: mark unused callback parameters
streaming: mark unused virtual method parameters
transport: mark bundle transport_options as unused
refs: mark unused virtual method parameters
refs: mark unused reflog callback parameters
refs: mark unused each_ref_fn parameters
git-compat-util: add UNUSED macro
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Fix deadlocks between main Git process and subprocess spawned via
the pipe_command() API, that can kill "git add -p" that was
reimplemented in C recently.
* jk/pipe-command-nonblock:
pipe_command(): mark stdin descriptor as non-blocking
pipe_command(): handle ENOSPC when writing to a pipe
pipe_command(): avoid xwrite() for writing to pipe
git-compat-util: make MAX_IO_SIZE define globally available
nonblock: support Windows
compat: add function to enable nonblocking pipes
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Code clean-up of "git submodule--helper".
* ab/submodule-helper-prep: (33 commits)
submodule--helper: fix bad config API usage
submodule--helper: libify even more "die" paths for module_update()
submodule--helper: libify more "die" paths for module_update()
submodule--helper: check repo{_submodule,}_init() return values
submodule--helper: libify "must_die_on_failure" code paths (for die)
submodule--helper update: don't override 'checkout' exit code
submodule--helper: libify "must_die_on_failure" code paths
submodule--helper: libify determine_submodule_update_strategy()
submodule--helper: don't exit() on failure, return
submodule--helper: use "code" in run_update_command()
submodule API: don't handle SM_..{UNSPECIFIED,COMMAND} in to_string()
submodule--helper: don't call submodule_strategy_to_string() in BUG()
submodule--helper: add missing braces to "else" arm
submodule--helper: return "ret", not "1" from update_submodule()
submodule--helper: rename "int res" to "int ret"
submodule--helper: don't redundantly check "else if (res)"
submodule--helper: refactor "errmsg_str" to be a "struct strbuf"
submodule--helper: add "const" to passed "struct update_data"
submodule--helper: add "const" to copy of "update_data"
submodule--helper: add "const" to passed "module_clone_data"
...
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Fix code added in ce125d431aa (submodule: extract path to submodule
gitdir func, 2021-09-15) and a77c3fcb5ec (submodule--helper: get
remote names from any repository, 2022-03-04) which failed to check
the return values of repo_init() and repo_submodule_init(). If we
failed to initialize the repository or submodule we could segfault
when trying to access the invalid repository structs.
Let's also check that these were the only such logic errors in the
codebase by making use of the "warn_unused_result" attribute. This is
valid as of GCC 3.4.0 (and clang will catch it via its faking of
__GNUC__ ).
As the comment being added to git-compat-util.h we're piggy-backing on
the LAST_ARG_MUST_BE_NULL version check out of lazyness. See
9fe3edc47f1 (Add the LAST_ARG_MUST_BE_NULL macro, 2013-07-18) for its
addition. The marginal benefit of covering gcc 3.4.0..4.0.0 is
near-zero (or zero) at this point. It mostly matters that we catch
this somewhere.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As noted in the preceding commit our "UNUSED" macro was no longer
protecting against actual use of the "unused" variables, which it was
previously doing by renaming the variable.
Let's instead use the "deprecated" attribute to accomplish that
goal. As [1] rightly notes this has the drawback that compiling with
"-Wno-deprecated-declarations" will silence any such uses. I think the
trade-off is worth it as:
* We can consider that a feature, as e.g. backporting certain patches
might use a now "unused" parameter, and the person doing that might
want to silence it with DEVOPTS=no-error.
* This way we play nicely with coccinelle, and any other dumb(er)
parser of C (such as syntax highlighters).
* Not every single compilation of git needs to catch "used but
declared unused" parameters. It's sufficient that the default "make
DEVELOPER=1" will do so, and that the "static-analysis" CI job will
catch it.
1. https://lore.kernel.org/git/YwCtkwjWdJVHHZV0@coredump.intra.peff.net/
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As reported in [1] the "UNUSED(var)" macro introduced in
2174b8c75de (Merge branch 'jk/unused-annotation' into next,
2022-08-24) breaks coccinelle's parsing of our sources in files where
it occurs.
Let's instead partially go with the approach suggested in [2] of
making this not take an argument. As noted in [1] "coccinelle" will
ignore such tokens in argument lists that it doesn't know about, and
it's less of a surprise to syntax highlighters.
This undoes the "help us notice when a parameter marked as unused is
actually use" part of 9b240347543 (git-compat-util: add UNUSED macro,
2022-08-19), a subsequent commit will further tweak the macro to
implement a replacement for that functionality.
1. https://lore.kernel.org/git/220825.86ilmg4mil.gmgdl@evledraar.gmail.com/
2. https://lore.kernel.org/git/220819.868rnk54ju.gmgdl@evledraar.gmail.com/
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The commit 29de20504e (Makefile: fix default regex settings on
Darwin, 2013-05-11) fixed t0070-fundamental.sh under Darwin (macOS) by
adopting Git's regex library. However, this library is compiled with
NO_MBSUPPORT, which causes git-grep to work incorrectly on multibyte
(e.g. UTF-8) files. Current macOS versions pass t0070-fundamental.sh
with the native macOS regex library, which also supports multibyte
characters.
Adjust the Makefile to use the native regex library, and call
setlocale(3) to set CTYPE according to the user's preference.
The setlocale call is required on all platforms, but in platforms
supporting gettext(3), setlocale was called as a side-effect of
initializing gettext. Therefore, move the CTYPE setlocale call from
gettext.c to common-main.c and the corresponding locale.h include
into git-compat-util.h.
Thanks to the global initialization of CTYPE setlocale, the test-tool
regex command now works correctly with supported multibyte regexes, and
is used to set the MB_REGEX test prerequisite by assessing a platform's
support for them.
Signed-off-by: Diomidis Spinellis <dds@aueb.gr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The "diagnose" feature to create a zip archive for diagnostic
material has been lifted from "scalar" and made into a feature of
"git bugreport".
* vd/scalar-generalize-diagnose:
scalar: update technical doc roadmap
scalar-diagnose: use 'git diagnose --mode=all'
builtin/bugreport.c: create '--diagnose' option
builtin/diagnose.c: add '--mode' option
builtin/diagnose.c: create 'git diagnose' builtin
diagnose.c: add option to configure archive contents
scalar-diagnose: move functionality to common location
scalar-diagnose: move 'get_disk_info()' to 'compat/'
scalar-diagnose: add directory to archiver more gently
scalar-diagnose: avoid 32-bit overflow of size_t
scalar-diagnose: use "$GIT_UNZIP" in test
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Fix deadlocks between main Git process and subprocess spawned via
the pipe_command() API, that can kill "git add -p" that was
reimplemented in C recently.
* jk/pipe-command-nonblock:
pipe_command(): mark stdin descriptor as non-blocking
pipe_command(): handle ENOSPC when writing to a pipe
pipe_command(): avoid xwrite() for writing to pipe
git-compat-util: make MAX_IO_SIZE define globally available
nonblock: support Windows
compat: add function to enable nonblocking pipes
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In the non-Windows version of this function, we never have any errors to
report, and thus the "report" parameter is unused. But we can't drop it,
because we have to maintain function call compatibility with the version
in compat/mingw.h, which does use this parameter.
Note that there's an extra level of indirection here; the common
function is actually is_path_owned_by_current_user, which is a macro
pointing to "by_current_uid" or "by_current_sid", depending on the
platform. So an alternative here is to eat the unused parameter in the
macro, since -Wunused-parameter doesn't complain about macros. But I
think the UNUSED() annotation is less obfuscated for somebody reading
the code later.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The callback passed to git_config() must conform to a particular
interface. But most callbacks don't actually look at the extra "void
*data" parameter. Let's mark the unused parameters to make
-Wunused-parameter happy.
Note there's one unusual case here in get_remote_default() where we
actually ignore the "value" parameter. That's because it's only checking
whether the option is found at all, and not parsing its value.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In preparation for compiling with -Wunused-parameter, we'd like to be
able to annotate some function parameters as false positives (e.g.,
parameters which must exist to conform to a callback interface).
Ideally our annotation will:
- be portable, turning into nothing on platforms which don't support
it
- be easy to read, without looking too syntactically odd or taking
attention away from the rest of the parameters
- help us notice when a parameter marked as unused is actually used,
which keeps our annotations accurate. In theory a compiler could
tell us this easily, but gcc has no such warning. Clang has
-Wused-but-marked-unused, but it triggers false positives with our
MAYBE_UNUSED annotation (e.g., for commit-slab functions)
This patch introduces an UNUSED() macro which takes the parameter name
as an argument. That lets us tweak the name in such a way that we'll
notice if somebody tries to use it. It looks like this in use:
int some_ref_cb(const char *refname,
const struct object_id *UNUSED(oid),
int UNUSED(flags),
void *UNUSED(data))
{
printf("got refname %s", refname);
return 0;
}
Because the unused parameter names are rewritten behind the scenes to
UNUSED_oid, etc, adding code like:
printf("oid is %s", oid_to_hex(oid));
will fail compilation with "oid undeclared". Sadly, the "did you mean"
feature of modern compilers is not generally smart enough to suggest the
"unused" name. If we used a very short prefix like U_oid, that does
convince gcc to say "did you mean", but since the "U_" in the suggestion
isn't much of a hint, it doesn't really help. In practice, a look at the
function definition usually makes the problem pretty obvious.
Note that we have to put the definition of UNUSED early in
git-compat-util.h, because it will eventually be used for some compat
functions themselves (both directly here and in mingw.h).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We define MAX_IO_SIZE within wrapper.c, but it's useful for any code
that wants to do a raw write() for whatever reason (say, because they
want different EAGAIN handling). Let's make it available everywhere.
The alternative would be adding xwrite_foo() variants to give callers
more options. But there's really no reason MAX_IO_SIZE needs to be
abstracted away, so this give callers the most flexibility.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Move 'get_disk_info()' function into 'compat/'. Although Scalar-specific
code is generally not part of the main Git tree, 'get_disk_info()' will be
used in subsequent patches by additional callers beyond 'scalar diagnose'.
This patch prepares for that change, at which point this platform-specific
code should be part of 'compat/' as a matter of convention.
The function is copied *mostly* verbatim, with two exceptions:
* '#ifdef WIN32' is replaced with '#ifdef GIT_WINDOWS_NATIVE' to allow
'statvfs' to be used with Cygwin.
* the 'struct strbuf buf' and 'int res' (as well as their corresponding
cleanup & return) are moved outside of the '#ifdef' block.
Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When verifying the ownership of the Git directory, we sometimes would
like to say a bit more about it, e.g. when using a platform-dependent
code path (think: Windows has the permission model that is so different
from Unix'), but only when it is a appropriate to actually say
something.
To allow for that, collect that information and hand it back to the
caller (whose responsibility it is to show it or not).
Note: We do not actually fill in any platform-dependent information yet,
this commit just adds the infrastructure to be able to do so.
Based-on-an-idea-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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* maint-2.35:
Git 2.35.4
Git 2.34.4
Git 2.33.4
Git 2.32.3
Git 2.31.4
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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* maint-2.34:
Git 2.34.4
Git 2.33.4
Git 2.32.3
Git 2.31.4
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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* maint-2.33:
Git 2.33.4
Git 2.32.3
Git 2.31.4
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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* maint-2.32:
Git 2.32.3
Git 2.31.4
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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* maint-2.31:
Git 2.31.4
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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* maint-2.30:
Git 2.30.5
setup: tighten ownership checks post CVE-2022-24765
git-compat-util: allow root to access both SUDO_UID and root owned
t0034: add negative tests and allow git init to mostly work under sudo
git-compat-util: avoid failing dir ownership checks if running privileged
t: regression git needs safe.directory when using sudo
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"sudo git foo" used to consider a repository owned by the original
user a safe one to access; it now also considers a repository owned
by root a safe one, too (after all, if an attacker can craft a
malicious repository owned by root, the box is 0wned already).
* cb/path-owner-check-with-sudo-plus:
git-compat-util: allow root to access both SUDO_UID and root owned
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Previous changes introduced a regression which will prevent root for
accessing repositories owned by thyself if using sudo because SUDO_UID
takes precedence.
Loosen that restriction by allowing root to access repositories owned
by both uid by default and without having to add a safe.directory
exception.
A previous workaround that was documented in the tests is no longer
needed so it has been removed together with its specially crafted
prerequisite.
Helped-by: Johanness Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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