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This allows users to write hash-agnostic scripts and configs by
disabling abbreviations. Using "-c core.abbrev=40" will be
insufficient with SHA-256, and "-c core.abbrev=64" won't work with
SHA-1 repos today.
Signed-off-by: Eric Wong <e@80x24.org>
[jc: tweaked implementation, added doc and a test]
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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Code simplification by removing ineffective optimization.
* ps/ref-transaction-hook:
refs: remove lookup cache for reference-transaction hook
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Feeding "$ZERO_OID" to "git log --ignore-missing --stdin", and
running "git log --ignore-missing $ZERO_OID" fell back to start
digging from HEAD; it has been corrected to become a no-op, like
"git log --tags=no-tag-matches-this-pattern" does.
* jk/rev-input-given-fix:
revision: set rev_input_given in handle_revision_arg()
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Error message update.
* jc/ident-whose-ident:
ident: say whose identity is missing when giving user.name hint
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The description of --cached/--index options in "git apply --help"
has been updated.
* rp/apply-cached-doc:
git-apply.txt: update descriptions of --cached, --index
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"git restore/checkout --no-overlay" with wildcarded pathspec
mistakenly removed matching paths in subdirectories, which has been
corrected.
* rs/checkout-no-overlay-pathspec-fix:
checkout, restore: make pathspec recursive
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Finishing touches.
* al/bisect-first-parent:
bisect: add first-parent option to documentation
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Preliminary code clean-up before introducing "negative refspec".
* jk/refspecs-cleanup:
refspec: make sure stack refspec_item variables are zeroed
refspec: fix documentation referring to refspec_item
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Accesses to two pseudorefs have been updated to properly use ref
API.
* hn/refs-pseudorefs:
sequencer: treat REVERT_HEAD as a pseudo ref
builtin/commit: suggest update-ref for pseudoref removal
sequencer: treat CHERRY_PICK_HEAD as a pseudo ref
refs: make refs_ref_exists public
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Long ago, we decided to use 3 threads by default when running the
index-pack task in parallel, which has been adjusted a bit upwards.
* jk/index-pack-w-more-threads:
index-pack: adjust default threading cap
p5302: count up to online-cpus for thread tests
p5302: disable thread-count parameter tests by default
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The parser for "git for-each-ref --format=..." was too loose when
parsing the "%(trailers...)" atom, and forgot that "trailers" and
"trailers:<modifiers>" are the only two allowed forms, which has
been corrected.
* hv/ref-filter-trailers-atom-parsing-fix:
ref-filter: 'contents:trailers' show error if `:` is missing
t6300: unify %(trailers) and %(contents:trailers) tests
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Updates into a lazy/partial clone with a submodule did not work
well with transfer.fsckobjects set.
* jt/promisor-pack-fix:
fetch-pack: in partial clone, pass --promisor
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The output from the "diff" family of the commands had abbreviated
object names of blobs involved in the patch, but its length was not
affected by the --abbrev option. Now it is.
* dd/diff-customize-index-line-abbrev:
diff: index-line: respect --abbrev in object's name
t4013: improve diff-post-processor logic
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Aesthetic fix to a CI configuration file.
* am/ci-wsfix:
ci: fix inconsistent indentation
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Add the missing "e" in "de". While it is possible in French to omit it,
that only occurs with an apostrophe and only when the next word starts
with a vowel or mute h, which is not the case here.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Acked-by: Jean-Noël Avila <jn.avila@free.fr>
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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The FETCH_HEAD is now always read from the filesystem regardless of
the ref backend in use, as its format is much richer than the
normal refs, and written directly by "git fetch" as a plain file..
* hn/refs-fetch-head-is-special:
refs: read FETCH_HEAD and MERGE_HEAD generically
refs: move gitdir into base ref_store
refs: fix comment about submodule ref_stores
refs: split off reading loose ref data in separate function
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Command line completion (in contrib/) usually omits redundant,
deprecated and/or dangerous options from its output; it learned to
optionally include all of them.
* rz/complete-more-options:
completion: add GIT_COMPLETION_SHOW_ALL env var
parse-options: add --git-completion-helper-all
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Code clean-up.
* jk/leakfix:
submodule--helper: fix leak of core.worktree value
config: fix leak in git_config_get_expiry_in_days()
config: drop git_config_get_string_const()
config: fix leaks from git_config_get_string_const()
checkout: fix leak of non-existent branch names
submodule--helper: use strbuf_release() to free strbufs
clear_pattern_list(): clear embedded hashmaps
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API update.
* en/mem-pool:
mem-pool: use consistent pool variable name
mem-pool: use more standard initialization and finalization
mem-pool: add convenience functions for strdup and strndup
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Commit 7ba826290a (revision: add rev_input_given flag, 2017-08-02) added
a flag to rev_info to tell whether we got any revision arguments. As
explained there, this is necessary because some revision arguments may
not produce any pending traversal objects, but should still inhibit
default behaviors (e.g., a glob that matches nothing).
However, it only set the flag in the globbing code, but not for
revisions we get on the command-line or via stdin. This leads to two
problems:
- the command-line code keeps its own separate got_rev_arg flag; this
isn't wrong, but it's confusing and an extra maintenance burden
- even specifically-named rev arguments might end up not adding any
pending objects: if --ignore-missing is set, then specifying a
missing object is a noop rather than an error.
And that leads to some user-visible bugs:
- when deciding whether a default rev like "HEAD" should kick in, we
check both got_rev_arg and rev_input_given. That means that
"--ignore-missing $ZERO_OID" works on the command-line (where we set
got_rev_arg) but not on --stdin (where we don't)
- when rev-list decides whether it should complain that it wasn't
given a starting point, it relies on rev_input_given. So it can't
even get the command-line "--ignore-missing $ZERO_OID" right
Let's consistently set the flag if we got any revision argument. That
lets us clean up the redundant got_rev_arg, and fixes both of those bugs
(but note there are three new tests: we'll confirm the already working
git-log command-line case).
A few implementation notes:
- conceptually we want to set the flag whenever handle_revision_arg()
finds an actual revision arg ("handles" it, you might say). But it
covers a ton of cases with early returns. Rather than annotating
each one, we just wrap it and use its success exit-code to set the
flag in one spot.
- the new rev-list test is in t6018, which is titled to cover globs.
This isn't exactly a glob, but it made sense to stick it with the
other tests that handle the "even though we got a rev, we have no
pending objects" case, which are globs.
- the tests check for the oid of a missing object, which it's pretty
clear --ignore-missing should ignore. You can see the same behavior
with "--ignore-missing a-ref-that-does-not-exist", because
--ignore-missing treats them both the same. That's perhaps less
clearly correct, and we may want to change that in the future. But
the way the code and tests here are written, we'd continue to do the
right thing even if it does.
Reported-by: Bryan Turner <bturner@atlassian.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When adding the reference-transaction hook, there were concerns about
the performance impact it may have on setups which do not make use of
the new hook at all. After all, it gets executed every time a reftx is
prepared, committed or aborted, which linearly scales with the number of
reference-transactions created per session. And as there are code paths
like `git push` which create a new transaction for each reference to be
updated, this may translate to calling `find_hook()` quite a lot.
To address this concern, a cache was added with the intention to not
repeatedly do negative hook lookups. Turns out this cache caused a
regression, which was fixed via e5256c82e5 (refs: fix interleaving hook
calls with reference-transaction hook, 2020-08-07). In the process of
discussing the fix, we realized that the cache doesn't really help even
in the negative-lookup case. While performance tests added to benchmark
this did show a slight improvement in the 1% range, this really doesn't
warrent having a cache. Furthermore, it's quite flaky, too. E.g. running
it twice in succession produces the following results:
Test master pks-reftx-hook-remove-cache
--------------------------------------------------------------------------
1400.2: update-ref 2.79(2.16+0.74) 2.73(2.12+0.71) -2.2%
1400.3: update-ref --stdin 0.22(0.08+0.14) 0.21(0.08+0.12) -4.5%
Test master pks-reftx-hook-remove-cache
--------------------------------------------------------------------------
1400.2: update-ref 2.70(2.09+0.72) 2.74(2.13+0.71) +1.5%
1400.3: update-ref --stdin 0.21(0.10+0.10) 0.21(0.08+0.13) +0.0%
One case notably absent from those benchmarks is a single executable
searching for the hook hundreds of times, which is exactly the case for
which the negative cache was added. p1400.2 will spawn a new update-ref
for each transaction and p1400.3 only has a single reference-transaction
for all reference updates. So this commit adds a third benchmark, which
performs an non-atomic push of a thousand references. This will create a
new reference transaction per reference. But even for this case, the
negative cache doesn't consistently improve performance:
Test master pks-reftx-hook-remove-cache
--------------------------------------------------------------------------
1400.4: nonatomic push 6.63(6.50+0.13) 6.81(6.67+0.14) +2.7%
1400.4: nonatomic push 6.35(6.21+0.14) 6.39(6.23+0.16) +0.6%
1400.4: nonatomic push 6.43(6.31+0.13) 6.42(6.28+0.15) -0.2%
So let's just remove the cache altogether to simplify the code.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
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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Leakfix with code clean-up.
* en/dir-clear:
dir: fix problematic API to avoid memory leaks
dir: make clear_directory() free all relevant memory
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The patch-id computation did not ignore the "incomplete last line"
marker like whitespaces.
* rs/patch-id-with-incomplete-line:
patch-id: ignore newline at end of file in diff_flush_patch_id()
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Doc updates for subtree (in contrib/)
* dl/subtree-docs:
contrib/subtree: document 'push' does not take '--squash'
contrib/subtree: fix "unsure" for --message in the document
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Code clean-up.
* mt/checkout-entry-dead-code-removal:
checkout_entry(): remove unreachable error() call
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"git fetch" learned --no-write-fetch-head option to avoid writing
the FETCH_HEAD file.
* jc/no-update-fetch-head:
fetch: optionally allow disabling FETCH_HEAD update
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The recent addition of SHA-256 support is marked as experimental in
the documentation.
* ma/doc-sha-256-is-experimental:
Documentation: mark `--object-format=sha256` as experimental
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Use more buffered I/O where we used to call many small write(2)s.
* rs/more-buffered-io:
upload-pack: use buffered I/O to talk to rev-list
midx: use buffered I/O to talk to pack-objects
connected: use buffered I/O to talk to rev-list
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Fix some incorrect UNLEAK() annotations.
* jk/unleak-fixes:
ls-remote: simplify UNLEAK() usage
stop calling UNLEAK() before die()
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"ls-files -o" mishandled the top-level directory of another git
working tree that hangs in the current git working tree.
* en/dir-nonbare-embedded:
dir: avoid prematurely marking nonbare repositories as matches
t3000: fix some test description typos
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The "--batch-size" option of "git multi-pack-index repack" command
is now used to specify that very small packfiles are collected into
one until the total size roughly exceeds it.
* ds/midx-repack-to-batch-size:
multi-pack-index: repack batches below --batch-size
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The purpose of "git init --separate-git-dir" is to initialize a
new project with the repository separate from the working tree,
or, in the case of an existing project, to move the repository
(the .git/ directory) out of the working tree. It does not make
sense to use --separate-git-dir with a bare repository for which
there is no working tree, so disallow its use with bare
repositories.
* es/init-no-separate-git-dir-in-bare:
init: disallow --separate-git-dir with bare repository
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Ensure that the [--first-parent] option is listed in the output of
"git bisect -h".
Signed-off-by: Aaron Lipman <alipman88@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The pathspec given to git checkout and git restore is used with both
tree_entry_interesting (via read_tree_recursive) and match_pathspec
(via ce_path_match). The latter effectively only supports recursive
matching regardless of the value of the pathspec flag "recursive",
which is unset here.
That causes different match results for pathspecs with wildcards, and
can lead checkout and restore in no-overlay mode to remove entries
instead of modifying them. Enable recursive matching for both checkout
and restore to make matching consistent.
Setting the flag in checkout_main() technically also affects git switch,
but since that command doesn't accept pathspecs at all this has no
actual consequence.
Reported-by: Sergii Shkarnikov <sergii.shkarnikov@globallogic.com>
Initial-test-by: Sergii Shkarnikov <sergii.shkarnikov@globallogic.com>
Helped-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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If `user.name` and `user.email` have not been configured and the
user invokes:
git commit --author=...
without specifying the committer identity, then Git errors out with
a message asking the user to configure `user.name` and `user.email`
but doesn't tell the user which attribution was missing. This can be
confusing for a user new to Git who isn't aware of the distinction
between user, author, and committer.
Give such users a bit more help by extending the error message to
also say which attribution is expected.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The 'contents' atom does not show any error if used with 'trailers'
atom and colon is missing before trailers arguments.
e.g %(contents:trailersonly) works, while it shouldn't.
It is definitely not an expected behavior.
Let's fix this bug.
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Heba Waly <heba.waly@gmail.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A handful of Git's commands respect `--abbrev' for customizing length
of abbreviation of object names.
For diff-family, Git supports 2 different options for 2 different
purposes, `--full-index' for showing diff-patch object's name in full,
and `--abbrev' to customize the length of object names in diff-raw and
diff-tree header lines, without any options to customise the length of
object names in diff-patch format. When working with diff-patch format,
we only have two options, either full index, or default abbrev length.
Although, that behaviour is documented, it doesn't stop users from
trying to use `--abbrev' with the hope of customising diff-patch's
objects' name's abbreviation.
Let's allow the blob object names shown on the "index" line to be
abbreviated to arbitrary length given via the "--abbrev" option.
To preserve backward compatibility with old script that specify both
`--full-index' and `--abbrev', always show full object id
if `--full-index' is specified.
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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From 72f936b1 (t4013: make test hash independent, 2020-02-07),
we started to adjust metadata of git-diff's output in order to
ignore uninteresting metadata which is dependent of underlying hash
algorithm.
However, we forgot to special case all-zero object names, which is
special for missing objects, in consequence, we could't catch
possible future bugs where object names is all-zeros including but
not limited to:
* show intend-to-add entry
* deleted entry
* diff between index and working tree with new file
We also mistakenly munged file-modes as if they were object names
abbreviated to 6 hexadecimal digits.
In addition, in the upcoming change, we would like to test for
customizing the length of abbreviated blob objects on the index line,
which is not supported by current diff-processor logic.
Let's fix the bug for all-zero object names, and file modes.
While we're at it, support abbreviation of object names up to 16 bytes.
Based-on-patch-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently, there are different tests for testing %(trailers) and
%(contents:trailers) causing redundant copy.
Its time to get rid of duplicate code.
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Heba Waly <heba.waly@gmail.com>
Signed-off-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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While YAML allows different indentation styles as long as each block
is consistent, it is rather unusual to mix different indentations in
a single file. Adjust to use two-space indentation everywhere.
Signed-off-by: Adrian Moennich <adrian@planetcoding.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Commit b8a2486f15 (index-pack: support multithreaded delta resolving,
2012-05-06) describes an experiment that shows that setting the number
of threads for index-pack higher than 3 does not help.
I repeated that experiment using a more modern version of Git and a more
modern CPU and got different results.
Here are timings for p5302 against linux.git run on my laptop, a Core
i9-9880H with 8 cores plus hyperthreading (so online-cpus returns 16):
5302.3: index-pack 0 threads 256.28(253.41+2.79)
5302.4: index-pack 1 threads 257.03(254.03+2.91)
5302.5: index-pack 2 threads 149.39(268.34+3.06)
5302.6: index-pack 4 threads 94.96(294.10+3.23)
5302.7: index-pack 8 threads 68.12(339.26+3.89)
5302.8: index-pack 16 threads 70.90(655.03+7.21)
5302.9: index-pack default number of threads 116.91(290.05+3.21)
You can see that wall-clock times continue to improve dramatically up to
the number of cores, but bumping beyond that (into hyperthreading
territory) does not help (and in fact hurts a little).
Here's the same experiment on a machine with dual Xeon 6230's, totaling
40 cores (80 with hyperthreading):
5302.3: index-pack 0 threads 310.04(302.73+6.90)
5302.4: index-pack 1 threads 310.55(302.68+7.40)
5302.5: index-pack 2 threads 178.17(304.89+8.20)
5302.6: index-pack 5 threads 99.53(315.54+9.56)
5302.7: index-pack 10 threads 72.80(327.37+12.79)
5302.8: index-pack 20 threads 60.68(357.74+21.66)
5302.9: index-pack 40 threads 58.07(454.44+67.96)
5302.10: index-pack 80 threads 59.81(720.45+334.52)
5302.11: index-pack default number of threads 134.18(309.32+7.98)
The results are similar; things stop improving at 40 threads. Curiously,
going from 20 to 40 really doesn't help much, either (and increases CPU
time considerably). So that may represent an actual barrier to
parallelism, where we lose out due to context-switching and loss of
cache locality, but don't reap the wall-clock benefits due to contention
of our coarse-grained locks.
So what's a good default value? It's clear that the current cap of 3 is
too low; our default values are 42% and 57% slower than the best times
on each machine. The results on the 40-core machine imply that 20
threads is an actual barrier regardless of the number of cores, so we'll
take that as a maximum. We get the best results on these machines at
half of the online-cpus value. That's presumably a result of the
hyperthreading. That's common on multi-core Intel processors, but not
necessarily elsewhere. But if we take it as an assumption, we can
perform optimally on hyperthreaded machines and still do much better
than the status quo on other machines, as long as we never half below
the current value of 3.
So that's what this patch does.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When PERF_EXTRA is enabled, p5302 checks the performance of index-pack
with various numbers of threads. This can be useful for deciding what
the default should be (which is currently capped at 3 threads based on
the results of this script).
However, we only go up to 8 threads, and modern machines may have more.
Let's get the number of CPUs from test-tool, and test various numbers of
threads between one and that maximum.
Note that the current tests aren't all identical, as we have to set
GIT_FORCE_THREADS for the --threads=1 test (which measures the overhead
of starting a single worker thread versus the "0" case of using the main
thread). To keep the loop simple, we'll keep the "0" case out of it, and
set GIT_FORCE_THREADS=1 for all of the other cases (it's a noop for all
but the "1" case, since numbers higher than 1 would always need
threads).
Note also that we could skip running "test-tool" if PERF_EXTRA isn't
set. However, there's some small value in knowing the number of threads,
so that we can mark each test as skipped in the output.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The primary function of the perf suite is to detect regressions (or
improvements) between versions of Git. The only numbers we show a direct
comparison for are timings between the same test run on two different
versions.
However, it can sometimes be used to collect other information. For
instance, p5302 runs the same index-pack operation with different thread
counts. The output doesn't directly compare these, but anybody
interested in working on index-pack can manually compare the results.
For a normal regression run of the full perf-suite, though, this incurs
a significant cost to generate numbers nobody will actually look at;
about 25% of the total time of the test suite is spent in p5302. And the
low-thread-count runs are the most expensive part of it, since they're
(unsurprisingly) not using as many threads.
Let's skip these tests by default, but make it possible for people
working on index-pack to still run them by setting an environment
variable. Rather than make this specific to p5302, let's introduce a
generic mechanism. This makes it possible to run the full suite with
every possible test if somebody really wants to burn some CPU.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When pseudorefs move to a different ref storage mechanism, pseudorefs no longer
can be removed with 'rm'. Instead, suggest a "update-ref -d" command, which will
work regardless of ref storage backend.
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Check for existence and delete CHERRY_PICK_HEAD through ref functions.
This will help cherry-pick work with alternate ref storage backends.
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This will be necessary to replace file existence checks for pseudorefs.
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Eric Wong
Junio C Hamano
brian m. carlson
Jeff King
Patrick Steinhardt
Aaron Lipman
René Scharfe
Hariom Verma
Đoàn Trần Công Danh
Adrian Moennich
Han-Wen Nienhuys