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In 2f732bf15e6 (tr2: log parent process name, 2021-07-21) we started
logging parent process names, but only logged all parents on Windows.
on Linux only the name of the immediate parent process was logged.
Extend the functionality added there to also log full parent chain on
Linux.
This requires us to lookup "/proc/<getppid()>/stat" instead of
"/proc/<getppid()>/comm". The "comm" file just contains the name of the
process, but the "stat" file has both that information, and the parent
PID of that process, see procfs(5). We parse out the parent PID of our
own parent, and recursively walk the chain of "/proc/*/stat" files all
the way up the chain. A parent PID of 0 indicates the end of the
chain.
It's possible given the semantics of Linux's PID files that we end up
getting an entirely nonsensical chain of processes. It could happen if
e.g. we have a chain of processes like:
1 (init) => 321 (bash) => 123 (git)
Let's assume that "bash" was started a while ago, and that as shown
the OS has already cycled back to using a lower PID for us than our
parent process. In the time it takes us to start up and get to
trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP) our parent
process might exit, and be replaced by an entirely different process!
We'd racily look up our own getppid(), but in the meantime our parent
would exit, and Linux would have cycled all the way back to starting
an entirely unrelated process as PID 321.
If that happens we'll just silently log incorrect data in our ancestry
chain. Luckily we don't need to worry about this except in this
specific cycling scenario, as Linux does not have PID
randomization. It appears it once did through a third-party feature,
but that it was removed around 2006[1]. For anyone worried about this
edge case raising PID_MAX via "/proc/sys/kernel/pid_max" will mitigate
it, but not eliminate it.
One thing we don't need to worry about is getting into an infinite
loop when walking "/proc/*/stat". See 353d3d77f4f (trace2: collect
Windows-specific process information, 2019-02-22) for the related
Windows code that needs to deal with that, and [2] for an explanation
of that edge case.
Aside from potential race conditions it's also a bit painful to
correctly parse the process name out of "/proc/*/stat". A simpler
approach is to use fscanf(), see [3] for an implementation of that,
but as noted in the comment being added here it would fail in the face
of some weird process names, so we need our own parse_proc_stat() to
parse it out.
With this patch the "ancestry" chain for a trace2 event might look
like this:
$ GIT_TRACE2_EVENT=/dev/stdout ~/g/git/git version | grep ancestry | jq -r .ancestry
[
"bash",
"screen",
"systemd"
]
And in the case of naughty process names like the following. This uses
perl's ability to use prctl(PR_SET_NAME, ...). See
Perl/perl5@7636ea95c5 (Set the legacy process name with prctl() on
assignment to $0 on Linux, 2010-04-15)[4]:
$ perl -e '$0 = "(naughty\nname)"; system "GIT_TRACE2_EVENT=/dev/stdout ~/g/git/git version"' | grep ancestry | jq -r .ancestry
[
"sh",
"(naughty\nname)",
"bash",
"screen",
"systemd"
]
1. https://grsecurity.net/news#grsec2110
2. https://lore.kernel.org/git/48a62d5e-28e2-7103-a5bb-5db7e197a4b9@jeffhostetler.com/
3. https://lore.kernel.org/git/87o8agp29o.fsf@evledraar.gmail.com/
4. https://github.com/Perl/perl5/commit/7636ea95c57762930accf4358f7c0c2dec086b5e
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Change code added in 2f732bf15e6 (tr2: log parent process name,
2021-07-21) to use a switch statement without a "default" branch to
have the compiler error if this code ever drifts out of sync with the
members of the "enum trace2_process_info_reason".
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In a subsequent commit I'll be replacing most of this code to log N
parents, but let's first fix bugs introduced in the recent
2f732bf15e6 (tr2: log parent process name, 2021-07-21).
It was using the strbuf_read_file() in the wrong way, its return value
is either a length or a negative value on error. If we didn't have a
procfs, or otherwise couldn't access it we'd end up pushing an empty
string to the trace2 ancestry array.
It was also using the strvec_push() API the wrong way. That API always
does an xstrdup(), so by detaching the strbuf here we'd leak
memory. Let's instead pass in our pointer for strvec_push() to
xstrdup(), and then free our own strbuf. I do have some WIP changes to
make strvec_push_nodup() non-static, which makes this and some other
callsites nicer, but let's just follow the prevailing pattern of using
strvec_push() for now.
We'll also need to free that "procfs_path" strbuf whether or not
strbuf_read_file() succeeds, which was another source of memory leaks
in 2f732bf15e6, i.e. we'd leak that memory as well if we weren't on a
system where we could read the file from procfs.
Let's move all the freeing of the memory to the end of the
function. If we're still at STRBUF_INIT with "name" due to not having
taken the branch where the strbuf_read_file() succeeds freeing it is
redundant. So we could move it into the body of the "if", but just
handling freeing the same way for all branches of the function makes
it more readable.
In combination with the preceding commit this makes all of
t[0-9]*trace2*.sh pass under SANITIZE=leak on Linux.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Fix a memory leak introduced in ee4512ed481 (trace2: create new
combined trace facility, 2019-02-22), we were doing a free() of other
memory allocated in tr2tls_create_self(), but not the "thread_name"
"struct strbuf".
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Rewrite a comment added in 2f732bf15e6 (tr2: log parent process name,
2021-07-21) to describe what we might do under
TRACE2_PROCESS_INFO_EXIT in the future, instead of vaguely referring
to "something extra".
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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I'm fairly sure that there is no way on Linux to inspect the process
tree without using procfs, any tool such as ps(1), top(1) etc. that
shows this sort of information ultimately looks the information up in
procfs.
So let's remove this comment added in 2f732bf15e6 (tr2: log parent
process name, 2021-07-21), it's setting us up for an impossible task.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Taylor Blau <me@ttaylorr.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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Build fix.
* sg/make-fix-ar-invocation:
Makefile: remove archives before manipulating them with 'ar'
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Update to the command line completion (in contrib/) for tcsh.
* ti/tcsh-completion-regression-fix:
completion: tcsh: Fix regression by drop of wrapper functions
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Command line completion updates.
* fc/completion-updates:
completion: bash: add correct suffix in variables
completion: bash: fix for multiple dash commands
completion: bash: fix for suboptions with value
completion: bash: fix prefix detection in branch.*
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Various bugs in "git rebase -r" have been fixed.
* pw/rebase-r-fixes:
rebase -r: fix merge -c with a merge strategy
rebase -r: don't write .git/MERGE_MSG when fast-forwarding
rebase -i: add another reword test
rebase -r: make 'merge -c' behave like reword
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Checking out all the paths from HEAD during the last conflicted
step in "git rebase" and continuing would cause the step to be
skipped (which is expected), but leaves MERGE_MSG file behind in
$GIT_DIR and confuses the next "git commit", which has been
corrected.
* pw/rebase-skip-final-fix:
rebase --continue: remove .git/MERGE_MSG
rebase --apply: restore some tests
t3403: fix commit authorship
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Use upload-artifacts v1 (instead of v2) for 32-bit linux, as the
new version has a blocker bug for that architecture.
* cb/ci-use-upload-artifacts-v1:
ci: use upload-artifacts v1 for dockerized jobs
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"git commit --fixup" now works with "--edit" again, after it was
broken in v2.32.
* jk/commit-edit-fixup-fix:
commit: restore --edit when combined with --fixup
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The revision traversal API has been optimized by taking advantage
of the commit-graph, when available, to determine if a commit is
reachable from any of the existing refs.
* ps/connectivity-optim:
revision: avoid hitting packfiles when commits are in commit-graph
commit-graph: split out function to search commit position
revision: stop retrieving reference twice
connected: do not sort input revisions
revision: separate walk and unsorted flags
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The most significant of this batch is of course "merge -sort".
Thanks, Elijah and everybody who helped the topic.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Update FreeBSD CI job
* cb/ci-freebsd-update:
ci: update freebsd 12 cirrus job
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Meh.
* tl/traverse-non-commits-rename:
list-objects.c: rename "traverse_trees_and_blobs" to "traverse_non_commits"
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The current implementation of GIT_TEST_FAIL_PREREQS is broken in
that checking for the lack of a prerequisite would not work. Avoid
the use of "if ! test_have_prereq X" in a test script.
* bc/t5607-avoid-broken-test-fail-prereqs:
t5607: avoid using prerequisites to select algorithm
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The userdiff pattern for "java" language has been updated.
* th/userdiff-more-java:
userdiff: improve java hunk header regex
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"git range-diff" code clean-up.
* jk/range-diff-fixes:
range-diff: use ssize_t for parsed "len" in read_patches()
range-diff: handle unterminated lines in read_patches()
range-diff: drop useless "offset" variable from read_patches()
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"git apply" miscounted the bytes and failed to read to the end of
binary hunks.
* jk/apply-binary-hunk-parsing-fix:
apply: keep buffer/size pair in sync when parsing binary hunks
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Remind developers that the userdiff patterns should be kept simple
and permissive, assuming that the contents they apply are always
syntactically correct.
* jc/userdiff-pattern-hint:
userdiff: comment on the builtin patterns
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Code clean-up.
* cb/builtin-merge-format-string-fix:
builtin/merge: avoid -Wformat-extra-args from ancient Xcode
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Debugging aid.
* js/log-protocol-version:
connect, protocol: log negotiated protocol version
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Use `ort` instead of `recursive` as the default merge strategy.
* en/ort-becomes-the-default:
Update docs for change of default merge backend
Change default merge backend from recursive to ort
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Documentation updates.
* en/merge-strategy-docs:
Update error message and code comment
merge-strategies.txt: add coverage of the `ort` merge strategy
git-rebase.txt: correct out-of-date and misleading text about renames
merge-strategies.txt: fix simple capitalization error
merge-strategies.txt: avoid giving special preference to patience algorithm
merge-strategies.txt: do not imply using copy detection is desired
merge-strategies.txt: update wording for the resolve strategy
Documentation: edit awkward references to `git merge-recursive`
directory-rename-detection.txt: small updates due to merge-ort optimizations
git-rebase.txt: correct antiquated claims about --rebase-merges
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"git pull" had various corner cases that were not well thought out
around its --rebase backend, e.g. "git pull --ff-only" did not stop
but went ahead and rebased when the history on other side is not a
descendant of our history. The series tries to fix them up.
* en/pull-conflicting-options:
pull: fix handling of multiple heads
pull: update docs & code for option compatibility with rebasing
pull: abort by default when fast-forwarding is not possible
pull: make --rebase and --no-rebase override pull.ff=only
pull: since --ff-only overrides, handle it first
pull: abort if --ff-only is given and fast-forwarding is impossible
t7601: add tests of interactions with multiple merge heads and config
t7601: test interaction of merge/rebase/fast-forward flags and options
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Loading of ref tips to prepare for common ancestry negotiation in
"git fetch-pack" has been optimized by taking advantage of the
commit graph when available.
* ps/fetch-pack-load-refs-optim:
fetch-pack: speed up loading of refs via commit graph
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Bugfix for common ancestor negotiation recently introduced in "git
push" code path.
* jt/push-negotiation-fixes:
fetch: die on invalid --negotiation-tip hash
send-pack: fix push nego. when remote has refs
send-pack: fix push.negotiate with remote helper
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trace2 logs learned to show parent process name to see in what
context Git was invoked.
* es/trace2-log-parent-process-name:
tr2: log parent process name
tr2: make process info collection platform-generic
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A handful of tests that assumed implementation details of files
backend for refs have been cleaned up.
* hn/refs-test-cleanup:
t6001: avoid direct file system access
t6500: use "ls -1" to snapshot ref database state
t7064: use update-ref -d to remove upstream branch
t1410: mark test as REFFILES
t1405: mark test for 'git pack-refs' as REFFILES
t1405: use 'git reflog exists' to check reflog existence
t2402: use ref-store test helper to create broken symlink
t3320: use git-symbolic-ref rather than filesystem access
t6120: use git-update-ref rather than filesystem access
t1503: mark symlink test as REFFILES
t6050: use git-update-ref rather than filesystem access
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Final batch for "merge -sort" optimization.
* en/ort-perf-batch-15:
merge-ort: remove compile-time ability to turn off usage of memory pools
merge-ort: reuse path strings in pool_alloc_filespec
merge-ort: store filepairs and filespecs in our mem_pool
diffcore-rename, merge-ort: add wrapper functions for filepair alloc/dealloc
merge-ort: switch our strmaps over to using memory pools
merge-ort: set up a memory pool
merge-ort: add pool_alloc, pool_calloc, and pool_strndup wrappers
diffcore-rename: use a mem_pool for exact rename detection's hashmap
merge-ort: rename str{map,intmap,set}_func()
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Pathname expansion (like "~username/") learned a way to specify a
location relative to Git installation (e.g. its $sharedir which is
$(prefix)/share), with "%(prefix)".
* js/expand-runtime-prefix:
expand_user_path: allow in-flight topics to keep using the old name
interpolate_path(): allow specifying paths relative to the runtime prefix
Use a better name for the function interpolating paths
expand_user_path(): clarify the role of the `real_home` parameter
expand_user_path(): remove stale part of the comment
tests: exercise the RUNTIME_PREFIX feature
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Doc update.
* ab/bundle-doc:
bundle doc: replace "basis" with "prerequsite(s)"
bundle doc: elaborate on rev<->ref restriction
bundle doc: elaborate on object prerequisites
bundle doc: rewrite the "DESCRIPTION" section
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Prepare the "ref-filter" machinery that drives the "--format"
option of "git for-each-ref" and its friends to be used in "git
cat-file --batch".
* zh/ref-filter-raw-data:
ref-filter: add %(rest) atom
ref-filter: use non-const ref_format in *_atom_parser()
ref-filter: --format=%(raw) support --perl
ref-filter: add %(raw) atom
ref-filter: add obj-type check in grab contents
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Input validation of "git pack-objects --stdin-packs" has been
corrected.
* ab/pack-stdin-packs-fix:
pack-objects: fix segfault in --stdin-packs option
pack-objects tests: cover blindspots in stdin handling
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Support for ancient versions of cURL library (pre 7.19.4) has been
dropped.
* ab/http-drop-old-curl:
http: rename CURLOPT_FILE to CURLOPT_WRITEDATA
http: drop support for curl < 7.19.3 and < 7.17.0 (again)
http: drop support for curl < 7.19.4
http: drop support for curl < 7.16.0
http: drop support for curl < 7.11.1
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"git add" can work better with the sparse index.
* ds/add-with-sparse-index:
add: remove ensure_full_index() with --renormalize
add: ignore outside the sparse-checkout in refresh()
pathspec: stop calling ensure_full_index
add: allow operating on a sparse-only index
t1092: test merge conflicts outside cone
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"git bisect" spawned "git show-branch" only to pretty-print the
title of the commit after checking out the next version to be
tested; this has been rewritten in C.
* jc/bisect-sans-show-branch:
bisect: simplify return code from bisect_checkout()
bisect: do not run show-branch just to show the current commit
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If a rebase is started with a --strategy option other than "ort" or
"recursive" then "merge -c" does not allow the user to reword the
commit message.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When fast-forwarding we do not create a new commit so .git/MERGE_MSG
is not removed and can end up seeding the message of a commit made
after the rebase has finished. Avoid writing .git/MERGE_MSG when we
are fast-forwarding by writing the file after the fast-forward
checks. Note that there are no changes to the fast-forward code, it is
simply moved.
Note that the way this change is implemented means we no longer write
the author script when fast-forwarding either. I believe this is safe
for the reasons below but it is a departure from what we do when
fast-forwarding a non-merge commit. If we reword the merge then 'git
commit --amend' will keep the authorship of the commit we're rewording
as it ignores GIT_AUTHOR_* unless --reset-author is passed. It will
also export the correct GIT_AUTHOR_* variables to any hooks and we
already test the authorship of the reworded commit. If we are not
rewording then we no longer call spilt_ident() which means we are no
longer checking the commit author header looks sane. However this is
what we already do when fast-forwarding non-merge commits in
skip_unnecessary_picks() so I don't think we're breaking any promises
by not checking the author here.
Reported-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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None of the existing reword tests check that there are no uncommitted
changes when the editor is opened. Reuse the editor script from the
last commit to fix this omission.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If the user runs git log while rewording a commit it is confusing if
sometimes we're amending the commit that's being reworded and at other
times we're creating a new commit depending on whether we could
fast-forward or not[1]. For this reason the reword command ensures
that there are no uncommitted changes when rewording. The reword
command also allows the user to edit the todo list while the rebase is
paused. As 'merge -c' also rewords commits make it behave like reword
and add a test.
[1] https://lore.kernel.org/git/xmqqlfvu4be3.fsf@gitster-ct.c.googlers.com/T/#m133009cb91cf0917bcf667300f061178be56680a
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The rules creating the $(LIB_FILE) and $(XDIFF_LIB) archives used to
be:
$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
until commit 7b76d6bf22 (Makefile: add and use the ".DELETE_ON_ERROR"
flag, 2021-06-29) removed the '$(RM) $@' part, claiming that "we can
rely on the "c" (create) being present in ARFLAGS", and (I presume)
assuming that it means that the named archive is created from scratch.
Unfortunately, that's not what the 'c' flag does, it merely "Suppress
the diagnostic message that is written to standard error by default
when the archive is created" [1]. Consequently, all object files that
are already present in an existing archive and are not replaced will
remain there. This leads to linker errors in back-to-back builds of
different revisions without a 'make clean' between them if source
files going into these archives are renamed in between:
# The last commit renaming files that go into 'libgit.a':
# bc62692757 (hash-lookup: rename from sha1-lookup, 2020-12-31)
# sha1-lookup.c => hash-lookup.c | 14 +++++++-------
# sha1-lookup.h => hash-lookup.h | 12 ++++++------
$ git checkout bc62692757^
HEAD is now at 7a7d992d0d sha1-lookup: rename `sha1_pos()` as `hash_pos()`
$ make
[...]
$ git checkout 7b76d6bf22
HEAD is now at 7b76d6bf22 Makefile: add and use the ".DELETE_ON_ERROR" flag
$ make
[...]
AR libgit.a
LINK git
/usr/bin/ld: libgit.a(hash-lookup.o): in function `bsearch_hash':
/home/szeder/src/git/hash-lookup.c:105: multiple definition of `bsearch_hash'; libgit.a(sha1-lookup.o):/home/szeder/src/git/sha1-lookup.c:105: first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:2213: git] Error 1
Restore the original make rules to first remove $(LIB_FILE) and
$(XDIFF_LIB) and then create them from scratch to avoid these build
errors.
[1] Quoting POSIX at:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ar.html
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The cleanup of old compat wrappers in bash completion caused a
regression on tcsh completion that still uses them.
Let's update the tcsh call site as well for addressing it.
Fixes: 441ecdab37fe ("completion: bash: remove old compat wrappers")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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__gitcomp automatically adds a suffix, but __gitcomp_nl and others
don't, we need to specify a space by default.
Can be tested with:
git config branch.autoSetupMe<tab>
This fix only works for versions of bash greater than 4.0, before that
"local sfx" creates an empty string, therefore the unset expansion
doesn't work. The same happens in zsh.
Therefore we don't add the test for that for now.
The correct fix for all shells requires semantic changes in __gitcomp,
but that can be done later.
Cc: SZEDER Gábor <szeder.dev@gmail.com>
Tested-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Otherwise options of commands like 'for-each-ref' are not completed.
Tested-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We need to ignore options that don't start with -- as well.
Depending on the value of COMP_WORDBREAKS the last word could be
duplicated otherwise.
Can be tested with:
git merge -X diff-algorithm=<tab>
Tested-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Ævar Arnfjörð Bjarmason
Junio C Hamano
Phillip Wood
SZEDER Gábor
Takashi Iwai
Felipe Contreras