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Move the raceproof_create_file() API added to cache.h and
object-file.c in 177978f56ad (raceproof_create_file(): new function,
2017-01-06) to its only user, refs/files-backend.c.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As a follow-up to the preceding commit where we removed the adjacent
"errno == EISDIR" condition in the same function, remove the
"last_errno != ENOTDIR" condition here.
It's not possible for us to hit this condition added in
5b2d8d6f218 (lock_ref_sha1_basic(): improve diagnostics for ref D/F
conflicts, 2015-05-11). Since a1c1d8170db (refs_resolve_ref_unsafe:
handle d/f conflicts for writes, 2017-10-06) we've explicitly caught
these in refs_resolve_ref_unsafe() before returning NULL:
if (errno != ENOENT &&
errno != EISDIR &&
errno != ENOTDIR)
return NULL;
We'd then always return the refname from refs_resolve_ref_unsafe()
even if we were in a broken state as explained in the preceding
commit. The elided context here is a call to refs_resolve_ref_unsafe().
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we lock a reference like "foo" we need to handle the case where
"foo" exists, but is an empty directory. That's what this code added
in bc7127ef0f (ref locking: allow 'foo' when 'foo/bar' used to exist
but not anymore., 2006-09-30) seems like it should be dealing with.
Except it doesn't, and we never take this branch. The reason is that
when bc7127ef0f was written this looked like:
ref = resolve_ref([...]);
if (!ref && errno == EISDIR) {
[...]
And in resolve_ref() we had this code:
fd = open(path, O_RDONLY);
if (fd < 0)
return NULL;
I.e. we would attempt to read "foo" with open(), which would fail with
EISDIR and we'd return NULL. We'd then take this branch, call
remove_empty_directories() and continue.
Since a1c1d8170d (refs_resolve_ref_unsafe: handle d/f conflicts for
writes, 2017-10-06) we don't. E.g. in the case of
files_copy_or_rename_ref() our callstack will look something like:
[...] ->
files_copy_or_rename_ref() ->
lock_ref_oid_basic() ->
refs_resolve_ref_unsafe()
At that point the first (now only) refs_resolve_ref_unsafe() call in
lock_ref_oid_basic() would do the equivalent of this in the resulting
call to refs_read_raw_ref() in refs_resolve_ref_unsafe():
/* Via refs_read_raw_ref() */
fd = open(path, O_RDONLY);
if (fd < 0)
/* get errno == EISDIR */
/* later, in refs_resolve_ref_unsafe() */
if ([...] && errno != EISDIR)
return NULL;
[...]
/* returns the refs/heads/foo to the caller, even though it's a directory */
return refname;
I.e. even though we got an "errno == EISDIR" we won't take this
branch, since in cases of EISDIR "resolved" is always
non-NULL. I.e. we pretend at this point as though everything's OK and
there is no "foo" directory.
We then proceed with the entire ref update and don't call
remove_empty_directories() until we call commit_ref_update(). See
5387c0d883 (commit_ref(): if there is an empty dir in the way, delete
it, 2016-05-05) for the addition of that code, and
a1c1d8170db (refs_resolve_ref_unsafe: handle d/f conflicts for writes,
2017-10-06) for the commit that changed the original codepath added in
bc7127ef0f to use this "EISDIR" handling.
Further historical commentary:
Before the two preceding commits the caller in files_reflog_expire()
was the only one out of our 4 callers that would pass non-NULL as an
oid. We would then set a (now gone) "resolve_flags" to
"RESOLVE_REF_READING" and just before that "errno != EISDIR" check do:
if (resolve_flags & RESOLVE_REF_READING)
return NULL;
There may have been some case where this ended up mattering and we
couldn't safely make this change before we removed the "oid"
parameter, but I don't think there was, see [1] for some discussion on
that.
In any case, now that we've removed the "oid" parameter in a preceding
commit we can be sure that this code is redundant, so let's remove it.
1. http://lore.kernel.org/git/871r801yp6.fsf@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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In the preceding commit the last caller that passed a non-NULL OID was
changed to pass NULL to lock_ref_oid_basic(). As noted in preceding
commits use of this API has been going away (we should use ref
transactions, or lock_raw_ref()), so we're unlikely to gain new
callers that want to pass the "oid".
So let's remove it, doing so means we can remove the "mustexist"
condition, and therefore anything except the "flags =
RESOLVE_REF_NO_RECURSE" case.
Furthermore, since the verify_lock() function we called did most of
its work when the "oid" was passed (as "old_oid") we can inline the
trivial part of it that remains in its only remaining caller. Without
a NULL "oid" passed it was equivalent to calling refs_read_ref_full()
followed by oidclr().
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Since the the preceding commit the "oid" parameter to reflog_expire()
is always NULL, but it was not cleaned up to reduce the size of the
diff. Let's do that subsequent API and documentation cleanup now.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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During reflog expiry, the cmd_reflog_expire() function first iterates
over all reflogs in logs/*, and then one-by-one acquires the lock for
each one and expires it. This behavior has been with us since this
command was implemented in 4264dc15e1 ("git reflog expire",
2006-12-19).
Change this to stop calling lock_ref_oid_basic() with the OID we saw
when we looped over the logs, instead have it pass the OID it managed
to lock.
This mostly mitigates a race condition where e.g. "git gc" will fail
in a concurrently updated repository because the branch moved since
"git reflog expire --all" was started. I.e. with:
error: cannot lock ref '<refname>': ref '<refname>' is at <OID-A> but expected <OID-B>
This behavior of passing in an "oid" was needed for an edge-case that
I've untangled in this and preceding commits though, namely that we
needed this OID because we'd:
1. Lookup the reflog name/OID via dwim_log()
2. With that OID, lock the reflog
3. Later in builtin/reflog.c we use the OID we looked as input to
lookup_commit_reference_gently(), assured that it's equal to the
OID we got from dwim_log().
We can be sure that this change is safe to make because between
dwim_log (step #1) and lock_ref_oid_basic (step #2) there was no other
logic relevant to the OID or expiry run in the cmd_reflog_expire()
caller.
We can thus treat that code as a black box, before and after this
change it would get an OID that's been locked, the only difference is
that now we mostly won't be failing to get the lock due to the TOCTOU
race[0]. That failure was purely an implementation detail in how the
"current OID" was looked up, it was divorced from the locking
mechanism.
What do we mean with "mostly"? It mostly mitigates it because we'll
still run into cases where the ref is locked and being updated as we
want to expire it, and other git processes wanting to update the refs
will in turn race with us as we expire the reflog.
That remaining race can in turn be mitigated with the
core.filesRefLockTimeout setting, see 4ff0f01cb7 ("refs: retry
acquiring reference locks for 100ms", 2017-08-21). In practice if that
value is high enough we'll probably never have ref updates or reflog
expiry failing, since the clients involved will retry for far longer
than the time any of those operations could take.
See [1] for an initial report of how this impacted "git gc" and a
large discussion about this change in early 2019. In particular patch
looked good to Michael Haggerty, see his[2]. That message seems to not
have made it to the ML archive, its content is quoted in full in my
[3].
I'm leaving behind now-unused code the refs API etc. that takes the
now-NULL "unused_oid" argument, and other code that can be simplified now
that we never have on OID in that context, that'll be cleaned up in
subsequent commits, but for now let's narrowly focus on fixing the
"git gc" issue. As the modified assert() shows we always pass a NULL
oid to reflog_expire() now.
Unfortunately this sort of probabilistic contention is hard to turn
into a test. I've tested this by running the following three subshells
in concurrent terminals:
(
rm -rf /tmp/git &&
git init /tmp/git &&
while true
do
head -c 10 /dev/urandom | hexdump >/tmp/git/out &&
git -C /tmp/git add out &&
git -C /tmp/git commit -m"out"
done
)
(
rm -rf /tmp/git-clone &&
git clone file:///tmp/git /tmp/git-clone &&
while git -C /tmp/git-clone pull
do
date
done
)
(
while git -C /tmp/git-clone reflog expire --all
do
date
done
)
Before this change the "reflog expire" would fail really quickly with
the "but expected" error noted above.
After this change both the "pull" and "reflog expire" will run for a
while, but eventually fail because I get unlucky with
core.filesRefLockTimeout (the "reflog expire" is in a really tight
loop). As noted above that can in turn be mitigated with higher values
of core.filesRefLockTimeout than the 100ms default.
As noted in the commentary added in the preceding commit there's also
the case of branches being racily deleted, that can be tested by
adding this to the above:
(
while git -C /tmp/git-clone branch topic master &&
git -C /tmp/git-clone branch -D topic
do
date
done
)
With core.filesRefLockTimeout set to 10 seconds (it can probably be a
lot lower) I managed to run all four of these concurrently for about
an hour, and accumulated ~125k commits, auto-gc's and all, and didn't
have a single failure. The loops visibly stall while waiting for the
lock, but that's expected and desired behavior.
0. https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use
1. https://lore.kernel.org/git/87tvg7brlm.fsf@evledraar.gmail.com/
2. http://lore.kernel.org/git/b870a17d-2103-41b8-3cbc-7389d5fff33a@alum.mit.edu
3. https://lore.kernel.org/git/87pnqkco8v.fsf@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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Add a comment about why it is that we need to check for the the
existence of a reflog we're deleting after we've successfully acquired
the lock in files_reflog_expire(). As noted in [1] the lock protocol
for reflogs is somewhat intuitive.
This early exit code the comment applies to dates all the way back to
4264dc15e19 (git reflog expire, 2006-12-19).
1. https://lore.kernel.org/git/54DCDA42.2060800@alum.mit.edu/
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Change the repo_dwim_log() function initially added as dwim_log() in
eb3a48221fd (log --reflog: use dwim_log, 2007-02-09) to accept a NULL
oid parameter. The refs_resolve_ref_unsafe() function it invokes
already deals with it, but it didn't.
This allows for a bit more clarity in a reflog-walk.c codepath added
in f2eba66d4d1 (Enable HEAD@{...} and make it independent from the
current branch, 2007-02-03). We'll shortly use this in
builtin/reflog.c as well.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Re-indent this argument list that's been mis-indented since it was
added in 34c319970d1 (refs/debug: trace into reflog expiry too,
2021-04-23). This makes a subsequent change smaller.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove the unused "skip" parameter to lock_raw_ref(), it was never
used. We do use it when passing "skip" to the
refs_rename_ref_available() function in files_copy_or_rename_ref(),
but not here.
This is part of a larger series that modifies lock_ref_oid_basic()
extensively, there will be no more modifications of this function in
this series, but since the preceding commit removed this unused
parameter from lock_ref_oid_basic(), let's do it here too for
consistency.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The lock_ref_oid_basic() function has gradually been replaced by use
of the file transaction API, there are only 4 remaining callers of
it.
None of those callers pass non-NULL "extras" and "skip" parameters,
the last such caller went away in 92b1551b1d4 (refs: resolve symbolic
refs first, 2016-04-25), so let's remove the parameters.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In the last commit we removed the REF_DELETING flag from
lock_ref_oid_basic(). Since then all of the remaining callers do pass
REF_NO_DEREF, but that has been ignored completely since
7a418f3a17 (lock_ref_sha1_basic(): only handle REF_NODEREF mode,
2016-04-22).
So we can simply get rid of the parameter entirely.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The lock_ref_oid_basic() function has gradually been replaced by
most callers no longer performing a low-level "acquire lock,
update and release", and instead using the ref transaction API.
So there are only 4 remaining callers of lock_ref_oid_basic().
None of those callers pass REF_DELETING anymore, the last caller went
away in 92b1551b1d (refs: resolve symbolic refs first,
2016-04-25).
Before that we'd refactored and moved this code in:
- 8df4e511387 (struct ref_update: move "have_old" into "flags",
2015-02-17)
- 7bd9bcf372d (refs: split filesystem-based refs code into a new
file, 2015-11-09)
- 165056b2fc (lock_ref_for_update(): new function, 2016-04-24)
We then finally stopped using it in 92b1551b1d (noted above). So let's
remove the handling of this parameter.
By itself this change doesn't benefit us much, but it's the start of
even more removal of unused code in and around this function in
subsequent commits.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In e0cc8ac8202 (packed_ref_store: make class into a subclass of
`ref_store`, 2017-06-23) a die() was added to packed_create_reflog(),
but not to any of the other reflog callbacks, let's do that.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@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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Update the documentation not to assume users are of certain gender
and adds to guidelines to do so.
* ds/gender-neutral-doc:
*: fix typos
comments: avoid using the gender of our users
doc: avoid using the gender of other people
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Prepare the internals for lazily fetching objects in submodules
from their promisor remotes.
* jt/partial-clone-submodule-1:
promisor-remote: teach lazy-fetch in any repo
run-command: refactor subprocess env preparation
submodule: refrain from filtering GIT_CONFIG_COUNT
promisor-remote: support per-repository config
repository: move global r_f_p_c to repo struct
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Code cleanup around struct_type_init() functions.
* ab/struct-init:
string-list.h users: change to use *_{nodup,dup}()
string-list.[ch]: add a string_list_init_{nodup,dup}()
dir.[ch]: replace dir_init() with DIR_INIT
*.c *_init(): define in terms of corresponding *_INIT macro
*.h: move some *_INIT to designated initializers
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Tiny test clean-up.
* dd/test-stdout-count-lines:
t6402: preserve git exit status code
t6400: preserve git ls-files exit status code
test-lib-functions: introduce test_stdout_line_count
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Test clean-up.
* hn/refs-test-cleanup:
t7509: avoid direct file access for writing CHERRY_PICK_HEAD
t1415: avoid direct filesystem access for writing refs
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Code clean-up.
* rs/khash-alloc-cleanup:
khash: clarify that allocations never fail
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Tiny code clean-up.
* ar/help-micro-cleanup:
help: convert git_cmd to page in one place
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Code clean-up.
* ar/submodule-helper-include-cleanup:
submodule--helper: remove redundant include
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Code clean-up and leak plugging in "git bundle".
* ab/bundle-updates:
bundle: remove "ref_list" in favor of string-list.c API
bundle.c: use a temporary variable for OIDs and names
bundle cmd: stop leaking memory from parse_options_cmd_bundle()
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Tiny API tweak.
* hn/refs-iterator-peel-returns-boolean:
refs: make explicit that ref_iterator_peel returns boolean
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Fill test gaps.
* ab/mktag-tests:
mktag tests: test fast-export
mktag tests: test for-each-ref
mktag tests: test update-ref and reachable fsck
mktag tests: test hash-object --literally and unreachable fsck
mktag tests: invert --no-strict test
mktag tests: parse out options in helper
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Fill test gaps.
* ab/show-branch-tests:
show-branch tests: add missing tests
show-branch: don't <COLOR></RESET> for space characters
show-branch tests: modernize test code
show-branch tests: rename the one "show-branch" test file
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Code recently added to support common ancestry negotiation during
"git push" did not sanity check its arguments carefully enough.
* ab/fetch-negotiate-segv-fix:
fetch: fix segfault in --negotiate-only without --negotiation-tip=*
fetch: document the --negotiate-only option
send-pack.c: move "no refs in common" abort earlier
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Use ".DELETE_ON_ERROR" pseudo target to simplify our Makefile.
* ab/make-delete-on-error:
Makefile: add and use the ".DELETE_ON_ERROR" flag
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Error message update.
* ew/mmap-failures:
xmmap: inform Linux users of tuning knobs on ENOMEM
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Whitespace fix.
* js/config-mak-windows-pcre-fix:
config.mak.uname: PCRE1 cleanup
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Update the location of system-side configuration file on Windows.
* js/gfw-system-config-loc-fix:
config: normalize the path of the system gitconfig
cmake(windows): set correct path to the system Git config
mingw: move Git for Windows' system config where users expect it
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Code cleanup.
* ks/submodule-cleanup:
submodule: remove unnecessary `prefix` based option logic
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When rebuilding the multi-pack index file reusing an existing one,
we used to blindly trust the existing file and ended up carrying
corrupted data into the updated file, which has been corrected.
* tb/midx-use-checksum:
midx: report checksum mismatches during 'verify'
midx: don't reuse corrupt MIDXs when writing
commit-graph: rewrite to use checksum_valid()
csum-file: introduce checksum_valid()
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The merge code had funny interactions between content based rename
detection and directory rename detection.
* en/merge-dir-rename-corner-case-fix:
merge-recursive: handle rename-to-self case
merge-ort: ensure we consult df_conflict and path_conflicts
t6423: test directory renames causing rename-to-self
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Performance tweaks of "git merge -sort" around lazy fetching of objects.
* en/ort-perf-batch-13:
merge-ort: add prefetching for content merges
diffcore-rename: use a different prefetch for basename comparisons
diffcore-rename: allow different missing_object_cb functions
t6421: add tests checking for excessive object downloads during merge
promisor-remote: output trace2 statistics for number of objects fetched
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More fix-ups and optimization to "merge -sort".
* en/ort-perf-batch-12:
merge-ort: miscellaneous touch-ups
Fix various issues found in comments
diffcore-rename: avoid unnecessary strdup'ing in break_idx
merge-ort: replace string_list_df_name_compare with faster alternative
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git grep --and -e foo" ought to have been diagnosed as an error
but instead segfaulted, which has been corrected.
* rs/grep-parser-fix:
grep: report missing left operand of --and
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Doc typo/grammo-fix.
* bk/doc-commit-typofix:
Documentation: fix typo in the --patch option of the commit command
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Prevent "git p4" from failing to submit changes to binary file.
* dc/p4-binary-submit-fix:
git-p4: fix failed submit by skip non-text data files
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Test fix.
* ab/pre-auto-gc-hook-test:
gc tests: add a test for the "pre-auto-gc" hook
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The "union" conflict resolution variant misbehaved when used with
binary merge driver.
* jk/union-merge-binary:
ll_union_merge(): rename path_unused parameter
ll_union_merge(): pass name labels to ll_xdl_merge()
ll_binary_merge(): handle XDL_MERGE_FAVOR_UNION
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CMake update.
* mr/cmake:
cmake: add warning for ignored MSGFMT_EXE
cmake: create compile_commands.json by default
cmake: add knob to disable vcpkg
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Various updates to tests around "git describe"
* ab/describe-tests-fix:
describe tests: support -C in "check_describe"
describe tests: fix nested "test_expect_success" call
describe tests: don't rely on err.actual from "check_describe"
describe tests: refactor away from glob matching
describe tests: improve test for --work-tree & --dirty
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Rewrite the backend for "diff -G/-S" to use pcre2 engine when
available.
* ab/pickaxe-pcre2: (22 commits)
xdiff-interface: replace discard_hunk_line() with a flag
xdiff users: use designated initializers for out_line
pickaxe -G: don't special-case create/delete
pickaxe -G: terminate early on matching lines
xdiff-interface: allow early return from xdiff_emit_line_fn
xdiff-interface: prepare for allowing early return
pickaxe -S: slightly optimize contains()
pickaxe: rename variables in has_changes() for brevity
pickaxe -S: support content with NULs under --pickaxe-regex
pickaxe: assert that we must have a needle under -G or -S
pickaxe: refactor function selection in diffcore-pickaxe()
perf: add performance test for pickaxe
pickaxe/style: consolidate declarations and assignments
diff.h: move pickaxe fields together again
pickaxe: die when --find-object and --pickaxe-all are combined
pickaxe: die when -G and --pickaxe-regex are combined
pickaxe tests: add missing test for --no-pickaxe-regex being an error
pickaxe tests: test for -G, -S and --find-object incompatibility
pickaxe tests: add test for "log -S" not being a regex
pickaxe tests: add test for diffgrep_consume() internals
...
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Preliminary clean-up of tests before the main reftable changes
hits the codebase.
* hn/prep-tests-for-reftable: (22 commits)
t1415: set REFFILES for test specific to storage format
t4202: mark bogus head hash test with REFFILES
t7003: check reflog existence only for REFFILES
t7900: stop checking for loose refs
t1404: mark tests that muck with .git directly as REFFILES.
t2017: mark --orphan/logAllRefUpdates=false test as REFFILES
t1414: mark corruption test with REFFILES
t1407: require REFFILES for for_each_reflog test
test-lib: provide test prereq REFFILES
t5304: use "reflog expire --all" to clear the reflog
t5304: restyle: trim empty lines, drop ':' before >
t7003: use rev-parse rather than FS inspection
t5000: inspect HEAD using git-rev-parse
t5000: reformat indentation to the latest fashion
t1301: fix typo in error message
t1413: use tar to save and restore entire .git directory
t1401-symbolic-ref: avoid direct filesystem access
t1401: use tar to snapshot and restore repo state
t5601: read HEAD using rev-parse
t9300: check ref existence using test-helper rather than a file system check
...
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Some more code and doc clarification around "git push".
* fc/push-simple-updates-cleanup:
push: don't get a full remote object
push: only check same_remote when needed
push: remove trivial function
push: remove redundant check
push: factor out the typical case
push: get rid of all the setup_push_* functions
push: trivial simplifications
push: make setup_push_* return the dst
push: only get the branch when needed
push: factor out null branch check
push: split switch cases
push: return immediately in trivial switch case
push: create new get_upstream_ref() helper
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Some code and doc clarification around "git push".
* fc/push-simple-updates:
doc: push: explain default=simple correctly
push: remove unused code in setup_push_upstream()
push: simplify setup_push_simple()
push: reorganize setup_push_simple()
push: copy code to setup_push_simple()
push: hedge code of default=simple
push: rename !triangular to same_remote
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"git cat-file --batch-all-objects"" misbehaved when "--batch" is in
use and did not ask for certain object traits.
* zh/cat-file-batch-fix:
cat-file: merge two block into one
cat-file: handle trivial --batch format with --batch-all-objects
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Ævar Arnfjörð Bjarmason
Jeff King
Junio C Hamano