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The only caller of this function passes in a static buffer
returned from git_path(). This looks dangerous at first
glance, but turns out to be OK because the first thing we do
is xstrdup() the result.
Let's turn this into a git_pathdup(). That's slightly more
efficient (no extra copy), and makes it easier to audit for
dangerous git_path() invocations.
Since there's only a single caller, let's just set this
default path inside the init function. That makes the memory
ownership clear.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Writing directly into the strbuf avoids a useless copy of
the data, and dropping calls to git_path() makes it easier
to audit for dangerous calls.
Note that git_path() does an implicit strbuf_reset(), but in
each of these cases we were either already doing that reset,
or writing into a fresh strbuf anyway.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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It's more efficient to use git_pathdup(), as it skips an
extra copy of the path. And by removing some calls to
git_path(), it makes it easier to audit for dangerous uses.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Long ago we added functions like git_path_merge_msg() to
replace the more dangerous git_path("MERGE_MSG"). Over time
some new calls to the latter have crept it. Let's convert
them to use the safer form.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Rather than have a variable with a short name that is fed to
git_path(), let's add a helper function that returns the
full path. This avoids the dangerous git_path() function.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This avoids using the dangerous git_path(). Right now
there's only one call site (because the writing half is
still part of the shell script), but it may come in handy in
the future as more of bisect is written in C. It also
matches how we access the other BISECT_* files.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git checkout" that handles a lot of paths has been optimized by
reducing the number of unnecessary checks of paths in the
has_dir_name() function.
* jh/add-index-entry-optim:
read-cache: speed up has_dir_name (part 2)
read-cache: speed up has_dir_name (part 1)
read-cache: speed up add_index_entry during checkout
p0006-read-tree-checkout: perf test to time read-tree
read-cache: add strcmp_offset function
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Teach has_dir_name() to see if the path of the new item
is greater than the last path in the index array before
attempting to search for it.
has_dir_name() is looking for file/directory collisions
in the index and has to consider each sub-directory
prefix in turn. This can cause multiple binary searches
for each path.
During operations like checkout, merge_working_tree()
populates the new index in sorted order, so we expect
to be able to append in many cases.
This commit is part 2 of 2. This commit handles the
additional possible short-cuts as we look at each
sub-directory prefix.
The net-net gains for add_index_entry_with_check() and
both had_dir_name() commits are best seen for very
large repos.
Here are results for an INFLATED version of linux.git
with 1M files.
$ GIT_PERF_REPO=/mnt/test/linux_inflated.git/ ./run upstream/base HEAD ./p0006-read-tree-checkout.sh
Test upstream/base HEAD
0006.2: read-tree br_base br_ballast (1043893) 3.79(3.63+0.15) 2.68(2.52+0.15) -29.3%
0006.3: switch between br_base br_ballast (1043893) 7.55(6.58+0.44) 6.03(4.60+0.43) -20.1%
0006.4: switch between br_ballast br_ballast_plus_1 (1043893) 10.84(9.26+0.59) 8.44(7.06+0.65) -22.1%
0006.5: switch between aliases (1043893) 10.93(9.39+0.58) 10.24(7.04+0.63) -6.3%
Here are results for a synthetic repo with 4.2M files.
$ GIT_PERF_REPO=~/work/gfw/t/perf/repos/gen-many-files-10.4.3.git/ ./run HEAD~3 HEAD ./p0006-read-tree-checkout.sh
Test HEAD~3 HEAD
0006.2: read-tree br_base br_ballast (4194305) 29.96(19.26+10.50) 23.76(13.42+10.12) -20.7%
0006.3: switch between br_base br_ballast (4194305) 56.95(36.08+16.83) 45.54(25.94+15.68) -20.0%
0006.4: switch between br_ballast br_ballast_plus_1 (4194305) 90.94(51.50+31.52) 78.22(39.39+30.70) -14.0%
0006.5: switch between aliases (4194305) 93.72(51.63+34.09) 77.94(39.00+30.88) -16.8%
Results for medium repos (like linux.git) are mixed and have
more variance (probably do to disk IO unrelated to this test.
$ GIT_PERF_REPO=/mnt/test/linux.git/ ./run HEAD~3 HEAD ./p0006-read-tree-checkout.sh
Test HEAD~3 HEAD
0006.2: read-tree br_base br_ballast (57994) 0.25(0.21+0.03) 0.20(0.17+0.02) -20.0%
0006.3: switch between br_base br_ballast (57994) 10.67(6.06+2.92) 10.51(5.94+2.91) -1.5%
0006.4: switch between br_ballast br_ballast_plus_1 (57994) 0.59(0.47+0.16) 0.52(0.40+0.13) -11.9%
0006.5: switch between aliases (57994) 0.59(0.44+0.17) 0.51(0.38+0.14) -13.6%
$ GIT_PERF_REPO=/mnt/test/linux.git/ ./run HEAD~3 HEAD ./p0006-read-tree-checkout.sh
Test HEAD~3 HEAD
0006.2: read-tree br_base br_ballast (57994) 0.24(0.21+0.02) 0.21(0.18+0.02) -12.5%
0006.3: switch between br_base br_ballast (57994) 10.42(5.98+2.91) 10.66(5.86+3.09) +2.3%
0006.4: switch between br_ballast br_ballast_plus_1 (57994) 0.59(0.49+0.13) 0.53(0.37+0.16) -10.2%
0006.5: switch between aliases (57994) 0.59(0.43+0.17) 0.50(0.37+0.14) -15.3%
Results for smaller repos (like git.git) are not significant.
$ ./run HEAD~3 HEAD ./p0006-read-tree-checkout.sh
Test HEAD~3 HEAD
0006.2: read-tree br_base br_ballast (3043) 0.01(0.00+0.00) 0.01(0.00+0.00) +0.0%
0006.3: switch between br_base br_ballast (3043) 0.31(0.17+0.11) 0.29(0.19+0.08) -6.5%
0006.4: switch between br_ballast br_ballast_plus_1 (3043) 0.03(0.02+0.00) 0.03(0.02+0.00) +0.0%
0006.5: switch between aliases (3043) 0.03(0.02+0.00) 0.03(0.02+0.00) +0.0%
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Teach has_dir_name() to see if the path of the new item
is greater than the last path in the index array before
attempting to search for it.
has_dir_name() is looking for file/directory collisions
in the index and has to consider each sub-directory
prefix in turn. This can cause multiple binary searches
for each path.
During operations like checkout, merge_working_tree()
populates the new index in sorted order, so we expect
to be able to append in many cases.
This commit is part 1 of 2. This commit handles the top
of has_dir_name() and the trivial optimization.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Teach add_index_entry_with_check() to see if the path
of the new item is greater than the last path in the
index array before attempting to search for it.
During checkout, merge_working_tree() populates the new
index in sorted order, so this change will save a binary
lookups per file. This preserves the original behavior
but simply checks the last element before starting the
search.
This helps performance on very large repositories.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Created t/perf/repos/many-files.sh to generate large, but
artificial repositories.
Created t/perf/inflate-repo.sh to alter an EXISTING repo
to have a set of large commits. This can be used to create
a branch with 1M+ files in repositories like git.git or
linux.git, but with more realistic content. It does this
by making multiple copies of the entire worktree in a series
of sub-directories.
The branch name and ballast structure created by both scripts
match, so either script can be used to generate very large
test repositories for the following perf test.
Created t/perf/p0006-read-tree-checkout.sh to measure
performance on various read-tree, checkout, and update-index
operations. This test can run using either normal repos or
ones from the above scripts.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add strcmp_offset() function to also return the offset of the
first change.
Add unit test and helper to verify.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Doc update.
* ss/submodule-shallow-doc:
gitmodules: clarify what history depth a shallow clone has
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Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Doc update.
* ss/gitmodules-ignore-doc:
gitmodules: clarify the ignore option values
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Add more structure and describe each possible option in a self-contained
way, not referring to any of the previously described options.
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The recently introduced conditional inclusion of configuration did
not work well when early-config mechanism was involved.
* nd/conditional-config-in-early-config:
config: correct file reading order in read_early_config()
config: handle conditional include when $GIT_DIR is not set up
config: prepare to pass more info in git_config_with_options()
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Config file reading order is important because each file can override
values in the previous files and this is expected behavior. Normally
we read in this order, all in do_git_config_sequence():
1. $HOME/.gitconfig
2. $GIT_DIR/config
3. config from command line
However in read_early_config() the order may be swapped a bit if
setup_git_directory() has not been called:
1. $HOME/.gitconfig
2. $GIT_DIR/config is NOT read because .git dir is not found _yet_
3. config from command line
4. $GIT_DIR/config is now READ (after discover_git_directory() call)
The reading at step 4 could override config at step 3, which is not
the expectation.
Now that we could pass the .git dir around, we could feed
discover_git_directory() back to step 2, so that it works again, and
remove step 4.
Noticed-by: Jeff King <peff@peff.net>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If setup_git_directory() and friends have not been called,
get_git_dir() (because of includeIf.gitdir:XXX) would lead to
die("BUG: setup_git_env called without repository");
There are two cases when a config file could be read before $GIT_DIR
is located.
The first one is check_repository_format(), where we read just the one
file $GIT_DIR/config to check if we could understand this
repository. This case should be safe. We do not parse include
directives, which can only be triggered from git_config_with_options,
but setup code uses a lower-level function. The concerned variables
should never be hidden away behind includes anyway.
The second one is triggered in check_pager_config() when we're about
to run an external git command. We might be able to find $GIT_DIR in
this case, which is exactly what read_early_config() does (and also is
what check_pager_config() uses). Conditional includes and
get_git_dir() could be triggered by the first
git_config_with_options() call there, before discover_git_directory()
is used as a fallback $GIT_DIR detection.
Detect this special "early reading" case, pass down the $GIT_DIR,
either from previous setup or detected by discover_git_directory(),
and make conditional include use it.
Noticed-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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So far we can only pass one flag, respect_includes, to thie function. We
need to pass some more (non-flag even), so let's make it accept a struct
instead of an integer.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Doc update.
* ab/push-cas-doc-n-test:
push: document & test --force-with-lease with multiple remotes
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Document & test for cases where there are two remotes pointing to the
same URL, and a background fetch & subsequent `git push
--force-with-lease` shouldn't clobber un-updated references we haven't
fetched.
Some editors like Microsoft's VSC have a feature to auto-fetch in the
background, this bypasses the protections offered by
--force-with-lease & --force-with-lease=<refname>, as noted in the
documentation being added here.
See the 'Tools that do an automatic fetch defeat "git push
--force-with-lease"' (<1491617750.2149.10.camel@mattmccutchen.net>)
git mailing list thread for more details. Jakub Narębski suggested
this method of adding another remote to bypass this edge case,
document that & add a test for it.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Travis CI learns to run coccicheck.
* ls/travis-coccicheck:
travis-ci: add static analysis build job to run coccicheck
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Add a dedicated build job for static analysis. As a starter we only run
coccicheck but in the future we could run Clang Static Analyzer or
similar tools, too.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A recent update broke "git add -p ../foo" from a subdirectory.
* ps/pathspec-empty-prefix-origin:
pathspec: honor `PATHSPEC_PREFIX_ORIGIN` with empty prefix
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Previous to commit 5d8f084a5 (pathspec: simpler logic to prefix original
pathspec elements, 2017-01-04), we were always using the computed
`match` variable to perform pathspec matching whenever
`PATHSPEC_PREFIX_ORIGIN` is set. This is for example useful when passing
the parsed pathspecs to other commands, as the computed `match` may
contain a pathspec relative to the repository root. The commit changed
this logic to only do so when we do have an actual prefix and when
literal pathspecs are deactivated.
But this change may actually break some commands which expect passed
pathspecs to be relative to the repository root. One such case is `git
add --patch`, which now fails when using relative paths from a
subdirectory. For example if executing "git add -p ../foo.c" in a
subdirectory, the `git-add--interactive` command will directly pass
"../foo.c" to `git-ls-files`. As ls-files is executed at the
repository's root, the command will notice that "../foo.c" is outside
the repository and fail.
Fix the issue by again using the computed `match` variable when
`PATHSPEC_PREFIX_ORIGIN` is set and global literal pathspecs are
deactivated. Note that in contrast to previous behavior, we will now
always call `prefix_magic` regardless of whether a prefix is actually
set. But this is the right thing to do: when the `match` variable has
been resolved to the repository's root, it will be set to an empty
string. When passing the empty string directly to other commands, it
will result in a warning regarding deprecated empty pathspecs. By always
adding the prefix magic, we will end up with at least the string
":(prefix:0)" and thus avoid the warning.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Acked-by: Brandon Williams <bmwill@google.com>
Reviewed-by: Duy Nguyen <pclouds@gmail.com>
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Having a git command on the upstream side of a pipe in a test
script will hide the exit status from the command, which may cause
us to fail to notice a breakage; rewrite tests in a script to avoid
this issue.
* pc/t2027-git-to-pipe-cleanup:
t2027: avoid using pipes
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Whenever a git command is present in the upstream of a pipe, its failure
gets masked by piping. Hence we should avoid it for testing the
upstream git command. By writing out the output of the git command to
a file, we can test the exit codes of both the commands as a failure exit
code in any command is able to stop the && chain.
Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git rebase" learns "--signoff" option.
* gb/rebase-signoff:
rebase: pass --[no-]signoff option to git am
builtin/am: fold am_signoff() into am_append_signoff()
builtin/am: honor --signoff also when --rebasing
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This makes it easy to sign off a whole patchset before submission.
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There are no more direct calls to am_signoff(), so we can fold its
logic in am_append_signoff().
(This is done in a separate commit rather than in the previous one, to
make it easier to revert this specific change if additional calls are
ever introduced.)
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signoff is handled in parse_mail(), but not in parse_mail_rebasing(),
since the latter is only used when git-rebase calls git-am with the
--rebasing option, and --signoff is never passed in this case.
In order to introduce (in the upcoming commits) support for
`git-rebase --signoff`, we must make git-am pay attention to it also
in the rebase case. This can be done by moving the conditional
addition of the signoff from parse_mail() to the caller am_run(),
after either of the parse_mail*() functions were called.
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
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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gethostname(2) may not NUL terminate the buffer if hostname does
not fit; unfortunately there is no easy way to see if our buffer
was too small, but at least this will make sure we will not end up
using garbage past the end of the buffer.
* dt/xgethostname-nul-termination:
xgethostname: handle long hostnames
use HOST_NAME_MAX to size buffers for gethostname(2)
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If the full hostname doesn't fit in the buffer supplied to
gethostname, POSIX does not specify whether the buffer will be
null-terminated, so to be safe, we should do it ourselves. Introduce
new function, xgethostname, which ensures that there is always a \0
at the end of the buffer.
Signed-off-by: David Turner <dturner@twosigma.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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POSIX limits the length of host names to HOST_NAME_MAX. Export the
fallback definition from daemon.c and use this constant to make all
buffers used with gethostname(2) big enough for any possible result
and a terminating NUL.
Inspired-by: David Turner <dturner@twosigma.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: David Turner <dturner@twosigma.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"ls-files --recurse-submodules" did not quite work well in a
project with nested submodules.
* jk/ls-files-recurse-submodules-fix:
ls-files: fix path used when recursing into submodules
ls-files: fix recurse-submodules with nested submodules
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Don't assume that the current working directory is the root of the
repository. Correctly generate the path for the recursing child
processes by building it from the work_tree() root instead. Otherwise if
we run ls-files using --git-dir or --work-tree it will not work
correctly as it attempts to change directory into a potentially invalid
location. Best case, it doesn't exist and we produce an error. Worst
case we cd into the wrong location and unknown behavior occurs.
Add a new test which highlights this possibility.
Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Since commit e77aa336f116 ("ls-files: optionally recurse into
submodules", 2016-10-07) ls-files has known how to recurse into
submodules when displaying files.
Unfortunately this fails for certain cases, including when nesting more
than one submodule, called from within a submodule that itself has
submodules, or when the GIT_DIR environemnt variable is set.
Prior to commit b58a68c1c187 ("setup: allow for prefix to be passed to
git commands", 2017-03-17) this resulted in an error indicating that
--prefix and --super-prefix were incompatible.
After this commit, instead, the process loops forever with a GIT_DIR set
to the parent and continuously reads the parent submodule files and
recursing forever.
Fix this by preparing the environment properly for submodules when
setting up the child process. This is similar to how other commands such
as grep behave.
This was not caught by the original tests because the scenario is
avoided if the submodules are created separately and not stored as the
standard method of putting the submodule git directory under
.git/modules/<name>. We can update the test to show the failure by the
addition of "git submodule absorbgitdirs" to the test case. However,
note that this new test would run forever without the necessary fix in
this patch.
Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Various small fixes.
* rs/misc-cppcheck-fixes:
server-info: avoid calling fclose(3) twice in update_info_file()
files_for_each_reflog_ent_reverse(): close stream and free strbuf on error
am: close stream on error, but not stdin
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If an error occurs when or after closing the stream we call fclose(3)
again in the error handler. The second call can exhibit undefined
behavior, so make sure to call fclose(3) at most once. Also avoid
calling close(2) after fd has been successfully associated with the
stream, as fclose(3) has become responsible for doing that beyond
this point.
Found with Cppcheck.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Exit the loop orderly through the cleanup code, instead of dashing out
with logfp still open and sb leaking.
Found with Cppcheck.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Reviewed-by: Jeff King <peff@peff.net>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Avoid closing stdin, but do close an actual input file on error exit.
Found with Cppcheck.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Hotfix for a topic that is already in 'master'.
* jk/snprintf-cleanups:
replace: plug a memory leak
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Recent update to for_each_replace_name() to make it use a strbuf in
place of a fixed buffer forgot to release the memory held by the
strbuf before leaving the function.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Doc cleanup.
* xy/format-patch-base:
doc: trivial typo in git-format-patch.txt
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Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* sb/checkout-recurse-submodules:
submodule: remove a superfluous second check for the "new" variable
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Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git fetch-pack" was not prepared to accept ERR packet that the
upload-pack can send with a human-readable error message. It
showed the packet contents with ERR prefix, so there was no data
loss, but it was redundant to say "ERR" in an error message.
* jt/fetch-pack-error-reporting:
fetch-pack: show clearer error message upon ERR
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