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When there are many renames between the old base of a series of commits
and the new base, the way sequencer.c, merge-recursive.c, and
diffcore-rename.c have traditionally split the work resulted in
redetecting the same renames with each and every commit being
transplanted. To address this, the last several commits have been
creating a cache of rename detection results, determining when it was
safe to use such a cache in subsequent merge operations, adding helper
functions, and so on. See the previous half dozen commit messages for
additional discussion of this optimization, particularly the message a
few commits ago entitled "add code to check for whether cached renames
can be reused". This commit finally ties all of that work together,
modifying the merge algorithm to make use of these cached renames.
For the testcases mentioned in commit 557ac0350d ("merge-ort: begin
performance work; instrument with trace2_region_* calls", 2020-10-28),
this change improves the performance as follows:
Before After
no-renames: 5.665 s ± 0.129 s 5.622 s ± 0.059 s
mega-renames: 11.435 s ± 0.158 s 10.127 s ± 0.073 s
just-one-mega: 494.2 ms ± 6.1 ms 500.3 ms ± 3.8 ms
That's a fairly small improvement, but mostly because the previous
optimizations were so effective for these particular testcases; this
optimization only kicks in when the others don't. If we undid the
basename-guided rename detection and skip-irrelevant-renames
optimizations, then we'd see that this series by itself improved
performance as follows:
Before Basename Series After Just This Series
no-renames: 13.815 s ± 0.062 s 5.697 s ± 0.080 s
mega-renames: 1799.937 s ± 0.493 s 205.709 s ± 0.457 s
Since this optimization kicks in to help accelerate cases where the
previous optimizations do not apply, this last comparison shows that
this cached-renames optimization has the potential to help signficantly
in cases that don't meet the requirements for the other optimizations to
be effective.
The changes made in this optimization also lay some important groundwork
for a future optimization around having collect_merge_info() avoid
recursing into subtrees in more cases.
However, for this optimization to be effective, merge_switch_to_result()
should only be called when the rebase or cherry-pick operation has
either completed or hit a case where the user needs to resolve a
conflict or edit the result. If it is called after every commit, as
sequencer.c does, then the working tree and index are needlessly updated
with every commit and the cached metadata is tossed, defeating this
optimization. Refactoring sequencer.c to only call
merge_switch_to_result() at the end of the operation is a bigger
undertaking, and the practical benefits of this optimization will not be
realized until that work is performed. Since `test-tool fast-rebase`
only updates at the end of the operation, it was used to obtain the
timings above.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We will soon be adding an optimization that caches (in memory only,
never written to disk) upstream renames during a sequence of merges such
as occurs during a cherry-pick or rebase operation. Add several tests
meant to stress such an implementation to ensure it does the right
thing, and include a test whose outcome we will later change due to this
optimization as well.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Previously, when fast-rebase hit a conflict, it simply aborted and left
HEAD, the index, and the working tree where they were before the
operation started. While fast-rebase does not support restarting from a
conflicted state, write the conflicted state out anyway as it gives us a
way to see what the conflicts are and write tests that check for them.
This will be important in the upcoming commits, because sequencer.c is
only superficially integrated with merge-ort.c; in particular, it calls
merge_switch_to_result() after EACH merge instead of only calling it at
the end of all the sequence of merges (or when a conflict is hit). This
not only causes needless updates to the working copy and index, but also
causes all intermediate data to be freed and tossed, preventing caching
information from one merge to the next. However, integrating
sequencer.c more deeply with merge-ort.c is a big task, and making this
small extension to fast-rebase.c provides us with a simple way to test
the edge and corner cases that we want to make sure continue working.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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assert() can succinctly document expectations for the code, and do so in
a way that may be useful to future folks trying to refactor the code and
change basic assumptions; it allows them to more quickly find some
places where their violations of previous assumptions trips things up.
Unfortunately, assert() can surround a function call with important
side-effects, which is a huge mistake since some users will compile with
assertions disabled. I've had to debug such mistakes before in other
codebases, so I should know better. Luckily, this was only in test
code, but it's still very embarrassing. Change an assert() to an if
(...) BUG (...).
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add a new testcase where one side of history renames:
olddir/ -> newdir/
and the other side of history renames:
olddir/a -> olddir/alpha
When using merge.directoryRenames=true, it seems logical to expect the
file to end up at newdir/alpha. Unfortunately, both merge-recursive and
merge-ort currently see this as a rename/rename conflict:
olddir/a -> newdir/a
vs.
olddir/a -> newdir/alpha
Suggesting that there's some extra logic we probably want to add
somewhere to allow this case to run without triggering a conflict. For
now simply document this known issue.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In preparation for switching from merge-recursive to merge-ort as the
default strategy, have the testsuite default to running with merge-ort.
Keep coverage of the recursive backend by having the linux-gcc job run
with it.
Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we started on merge-ort, thousands of tests failed when run with
the GIT_TEST_MERGE_ALGORITHM=ort flag; with so many, it didn't make
sense to flip all their test expectations. The ones in t6409, t6418,
and the submodule tests are being handled by an independent in-flight
topic ("Complete merge-ort implemenation...almost"). The ones in
t6423 were left out of the other series because other ongoing series
that this commit depends upon were addressing those. Now that we only
have one remaining test failure in t6423, let's mark it as such.
This remaining test will be fixed by a future optimization series, but
since merge-recursive doesn't pass this test either, passing it is not
necessary for declaring merge-ort ready for general use.
Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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merge-ort handles submodules (and directory/file conflicts in general)
differently than merge-recursive does; it basically puts all the special
handling for different filetypes into one place in the codebase instead
of needing special handling for different filetypes in many different
code paths. This one code path in merge-ort could perhaps use some work
still (there are still test_expect_failure cases in the testsuite), but
it passes all the tests that merge-recursive does as well as 12
additional ones that merge-recursive fails. Mark those 12 tests as
test_expect_success under merge-ort.
Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When merge conflicts occur in paths removed by a sparse-checkout, we
need to unsparsify those paths (clear the SKIP_WORKTREE bit), and write
out the conflicted file to the working copy. In the very unlikely case
that someone manually put a file into the working copy at the location
of the SKIP_WORKTREE file, we need to avoid overwriting whatever edits
they have made and move that file to a different location first.
Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If there is a conflict during a merge for a SKIP_WORKTREE entry, we
expect that file to be written to the working copy and have the
SKIP_WORKTREE bit cleared in the index. If the user had manually
created a file in the working tree despite SKIP_WORKTREE being set, we
do not want to clobber their changes to that file, but want to move it
out of the way. Add tests that check for these behaviors.
Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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rename detection works by trying to pair all file deletions (or
"sources") with all file additions (or "destinations"), checking
similarity, and then marking the sufficiently similar ones as renames.
This can be expensive if there are many sources and destinations on a
given side of history as it results in an N x M comparison matrix.
However, there are many cases where we can compute in advance that
detecting renames for some of the sources provides no useful information
and thus that we can exclude those sources from the matrix.
To see why, first note that the merge machinery uses detected renames in
two ways:
* directory rename detection: when one side of history renames a
directory, and the other side of history adds new files to that
directory, we want to be able to warn the user about the need to
chose whether those new files stay in the old directory or move
to the new one.
* three-way content merging: in order to do three-way content merging
of files, we need three different file versions. If one side of
history renamed a file, then some of the content for the file is
found under a different path than in the merge base or on the
other side of history.
Add a simple testcase showing the two kinds of reasons renames are
relevant; it's a testcase that will only pass if we detect both kinds of
needed renames.
Other than the testcase added above, this commit concentrates just on
the three-way content merging; it will punt and mark all sources as
needed for directory rename detection, and leave it to future commits to
narrow that down more.
The point of three-way content merging is to reconcile changes made on
*both* sides of history. What if the file wasn't modified on both
sides? There are two possibilities:
* If it wasn't modified on the renamed side:
-> then we get to do exact rename detection, which is cheap.
* If it wasn't modified on the unrenamed side:
-> then detection of a rename for that source file is irrelevant
That latter claim might be surprising at first, so let's walk through a
case to show why rename detection for that source file is irrelevant.
Let's use two filenames, old.c & new.c, with the following abbreviated
object ids (and where the value '000000' is used to denote that the file
is missing in that commit):
old.c new.c
MERGE_BASE: 01d01d 000000
MERGE_SIDE1: 01d01d 000000
MERGE_SIDE2: 000000 5e1ec7
If the rename *isn't* detected:
then old.c looks like it was unmodified on one side and deleted on
the other and should thus be removed. new.c looks like a new file we
should keep as-is.
If the rename *is* detected:
then a three-way content merge is done. Since the version of the
file in MERGE_BASE and MERGE_SIDE1 are identical, the three-way merge
will produce exactly the version of the file whose abbreviated
object id is 5e1ec7. It will record that file at the path new.c,
while removing old.c from the directory.
Note that these two results are identical -- a single file named 'new.c'
with object id 5e1ec7. In other words, it doesn't matter if the rename
is detected in the case where the file is unmodified on the unrenamed
side.
Use this information to compute whether we need rename detection for
each source created in add_pair().
It's probably worth noting that there used to be a few other edge or
corner cases besides three-way content merges and directory rename
detection where lack of rename detection could have affected the result,
but those cases actually highlighted where conflict resolution methods
were not consistent with each other. Fixing those inconsistencies were
thus critically important to enabling this optimization. That work
involved the following:
* bringing consistency to add/add, rename/add, and rename/rename
conflict types, as done back in the topic merged at commit
ac193e0e0a ("Merge branch 'en/merge-path-collision'", 2019-01-04),
and further extended in commits 2a7c16c980 ("t6422, t6426: be more
flexible for add/add conflicts involving renames", 2020-08-10) and
e8eb99d4a6 ("t642[23]: be more flexible for add/add conflicts
involving pair renames", 2020-08-10)
* making rename/delete more consistent with modify/delete
as done in commits 1f3c9ba707 ("t6425: be more flexible with
rename/delete conflict messages", 2020-08-10) and 727c75b23f
("t6404, t6423: expect improved rename/delete handling in ort
backend", 2020-10-26)
Since the set of relevant_sources we compute has not yet been narrowed
down for directory rename detection, we do not pass it to
diffcore_rename_extended() yet. That will be done after subsequent
commits narrow down the list of relevant_sources needed for directory
rename detection reasons.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Make use of the new find_basename_matches() function added in the last
two patches, to find renames more rapidly in cases where we can match up
files based on basenames. As a quick reminder (see the last two commit
messages for more details), this means for example that
docs/extensions.txt and docs/config/extensions.txt are considered likely
renames if there are no remaining 'extensions.txt' files elsewhere among
the added and deleted files, and if a similarity check confirms they are
similar, then they are marked as a rename without looking for a better
similarity match among other files. This is a behavioral change, as
covered in more detail in the previous commit message.
We do not use this heuristic together with either break or copy
detection. The point of break detection is to say that filename
similarity does not imply file content similarity, and we only want to
know about file content similarity. The point of copy detection is to
use more resources to check for additional similarities, while this is
an optimization that uses far less resources but which might also result
in finding slightly fewer similarities. So the idea behind this
optimization goes against both of those features, and will be turned off
for both.
For the testcases mentioned in commit 557ac0350d ("merge-ort: begin
performance work; instrument with trace2_region_* calls", 2020-10-28),
this change improves the performance as follows:
Before After
no-renames: 13.815 s ± 0.062 s 13.294 s ± 0.103 s
mega-renames: 1799.937 s ± 0.493 s 187.248 s ± 0.882 s
just-one-mega: 51.289 s ± 0.019 s 5.557 s ± 0.017 s
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add a simple test where a removed file is similar to two different added
files; one of them has the same basename, and the other has a slightly
higher content similarity. In the current test, content similarity is
weighted higher than filename similarity.
Subsequent commits will add a new rule that weighs a mixture of filename
similarity and content similarity in a manner that will change the
outcome of this testcase.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Get rid of "GETTEXT_POISON" support altogether, which may or may
not be controversial.
* ab/detox-gettext-tests:
tests: remove uses of GIT_TEST_GETTEXT_POISON=false
tests: remove support for GIT_TEST_GETTEXT_POISON
ci: remove GETTEXT_POISON jobs
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Update support for invalid UTF-8 in PCRE2.
* ab/grep-pcre-invalid-utf8:
grep/pcre2: better support invalid UTF-8 haystacks
grep/pcre2 tests: don't rely on invalid UTF-8 data test
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The support for deprecated PCRE1 library has been dropped.
* ab/retire-pcre1:
Remove support for v1 of the PCRE library
config.mak.uname: remove redundant NO_LIBPCRE1_JIT flag
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Some pretty-format specifiers do not need the data in commit object
(e.g. "%H"), but we were over-eager to load and parse it, which has
been made even lazier.
* jk/pretty-lazy-load-commit:
pretty: lazy-load commit data when expanding user-format
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Cleaning various codepaths up.
* ds/more-index-cleanups:
t1092: test interesting sparse-checkout scenarios
test-lib: test_region looks for trace2 regions
sparse-checkout: load sparse-checkout patterns
name-hash: use trace2 regions for init
repository: add repo reference to index_state
fsmonitor: de-duplicate BUG()s around dirty bits
cache-tree: extract subtree_pos()
cache-tree: simplify verify_cache() prototype
cache-tree: clean up cache_tree_update()
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`git worktree list` now annotates worktrees as prunable, shows
locked and prunable attributes in --porcelain mode, and gained
a --verbose option.
* rs/worktree-list-verbose:
worktree: teach `list` verbose mode
worktree: teach `list` to annotate prunable worktree
worktree: teach `list --porcelain` to annotate locked worktree
t2402: ensure locked worktree is properly cleaned up
worktree: teach worktree_lock_reason() to gently handle main worktree
worktree: teach worktree to lazy-load "prunable" reason
worktree: libify should_prune_worktree()
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When "git rebase -i" processes "fixup" insn, there is no reason to
clean up the commit log message, but we did the usual stripspace
processing. This has been corrected.
* js/rebase-i-commit-cleanup-fix:
rebase -i: do leave commit message intact in fixup! chains
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Code clean-up.
* jk/t0000-cleanups:
t0000: consistently use single quotes for outer tests
t0000: run cleaning test inside sub-test
t0000: run prereq tests inside sub-test
t0000: keep clean-up tests together
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Test fix.
* sg/t7800-difftool-robustify:
t7800-difftool: don't accidentally match tmp dirs
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Test framework fix.
* sg/test-stress-jobs:
test-lib: prevent '--stress-jobs=X' from being ignored
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Test fix.
* pb/blame-funcname-range-userdiff:
annotate-tests: quote variable expansions containing path names
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A perf script was made more portable.
* jk/p5303-sed-portability-fix:
p5303: avoid sed GNU-ism
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"git ls-files" can and does show multiple entries when the index is
unmerged, which is a source for confusion unless -s/-u option is in
use. A new option --deduplicate has been introduced.
* zh/ls-files-deduplicate:
ls-files.c: add --deduplicate option
ls_files.c: consolidate two for loops into one
ls_files.c: bugfix for --deleted and --modified
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Document, clean-up and optimize the code around the cache-tree
extension in the index.
* ds/cache-tree-basics:
cache-tree: speed up consecutive path comparisons
cache-tree: use ce_namelen() instead of strlen()
index-format: discuss recursion of cache-tree better
index-format: update preamble to cache tree extension
index-format: use 'cache tree' over 'cached tree'
cache-tree: trace regions for prime_cache_tree
cache-tree: trace regions for I/O
cache-tree: use trace2 in cache_tree_update()
unpack-trees: add trace2 regions
tree-walk: report recursion counts
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"git log" learned a new "--diff-merges=<how>" option.
* so/log-diff-merge: (32 commits)
t4013: add tests for --diff-merges=first-parent
doc/git-show: include --diff-merges description
doc/rev-list-options: document --first-parent changes merges format
doc/diff-generate-patch: mention new --diff-merges option
doc/git-log: describe new --diff-merges options
diff-merges: add '--diff-merges=1' as synonym for 'first-parent'
diff-merges: add old mnemonic counterparts to --diff-merges
diff-merges: let new options enable diff without -p
diff-merges: do not imply -p for new options
diff-merges: implement new values for --diff-merges
diff-merges: make -m/-c/--cc explicitly mutually exclusive
diff-merges: refactor opt settings into separate functions
diff-merges: get rid of now empty diff_merges_init_revs()
diff-merges: group diff-merge flags next to each other inside 'rev_info'
diff-merges: split 'ignore_merges' field
diff-merges: fix -m to properly override -c/--cc
t4013: add tests for -m failing to override -c/--cc
t4013: support test_expect_failure through ':failure' magic
diff-merges: revise revs->diff flag handling
diff-merges: handle imply -p on -c/--cc logic for log.c
...
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The peel_ref() API has been replaced with peel_iterated_oid().
* jk/peel-iterated-oid:
refs: switch peel_ref() to peel_iterated_oid()
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Test clean-up plus UI improvement by hiding extra refs that
the prefetch task uses from "log --decorate" output.
* ds/maintenance-prefetch-cleanup:
t7900: clean up some broken refs
maintenance: set log.excludeDecoration durin prefetch
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The test case added by 9466e3809d ("blame: enable funcname blaming with
userdiff driver", 2020-11-01) forgot to quote variable expansions. This
causes failures when the current directory contains blanks.
One variable that the test case introduces will not have IFS characters
and could remain without quotes, but let's quote all expansions for
consistency, not just the one that has the path name.
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Acked-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git worktree list" annotates each worktree according to its state such
as "prunable" or "locked", however it is not immediately obvious why
these worktrees are being annotated. For prunable worktrees a reason
is available that is returned by should_prune_worktree() and for locked
worktrees a reason might be available provided by the user via `lock`
command.
Let's teach "git worktree list" a --verbose mode that outputs the reason
why the worktrees are being annotated. The reason is a text that can take
virtually any size and appending the text on the default columned format
will make it difficult to extend the command with other annotations and
not fit nicely on the screen. In order to address this shortcoming the
annotation is then moved to the next line indented followed by the reason
If the reason is not available the annotation stays on the same line as
the worktree itself.
The output of "git worktree list" with verbose becomes like so:
$ git worktree list --verbose
...
/path/to/locked-no-reason acb124 [branch-a] locked
/path/to/locked-with-reason acc125 [branch-b]
locked: worktree with a locked reason
/path/to/prunable-reason ace127 [branch-d]
prunable: gitdir file points to non-existent location
...
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rafael Silva <rafaeloliveira.cs@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The "git worktree list" command shows the absolute path to the worktree,
the commit that is checked out, the name of the branch, and a "locked"
annotation if the worktree is locked, however, it does not indicate
whether the worktree is prunable.
The "prune" command will remove a worktree if it is prunable unless
`--dry-run` option is specified. This could lead to a worktree being
removed without the user realizing before it is too late, in case the
user forgets to pass --dry-run for instance. If the "list" command shows
which worktree is prunable, the user could verify before running
"git worktree prune" and hopefully prevents the working tree to be
removed "accidentally" on the worse case scenario.
Let's teach "git worktree list" to show when a worktree is a prunable
candidate for both default and porcelain format.
In the default format a "prunable" text is appended:
$ git worktree list
/path/to/main aba123 [main]
/path/to/linked 123abc [branch-a]
/path/to/prunable ace127 (detached HEAD) prunable
In the --porcelain format a prunable label is added followed by
its reason:
$ git worktree list --porcelain
...
worktree /path/to/prunable
HEAD abc1234abc1234abc1234abc1234abc1234abc12
detached
prunable gitdir file points to non-existent location
...
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rafael Silva <rafaeloliveira.cs@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Commit c57b3367be (worktree: teach `list` to annotate locked worktree,
2020-10-11) taught "git worktree list" to annotate locked worktrees by
appending "locked" text to its output, however, this is not listed in
the --porcelain format.
Teach "list --porcelain" to do the same and add a "locked" attribute
followed by its reason, thus making both default and porcelain format
consistent. If the locked reason is not available then only "locked"
is shown.
The output of the "git worktree list --porcelain" becomes like so:
$ git worktree list --porcelain
...
worktree /path/to/locked
HEAD 123abcdea123abcd123acbd123acbda123abcd12
detached
locked
worktree /path/to/locked-with-reason
HEAD abc123abc123abc123abc123abc123abc123abc1
detached
locked reason why it is locked
...
In porcelain mode, if the lock reason contains special characters
such as newlines, they are escaped with backslashes and the entire
reason is enclosed in double quotes. For example:
$ git worktree list --porcelain
...
locked "worktree's path mounted in\nremovable device"
...
Furthermore, let's update the documentation to state that some
attributes in the porcelain format might be listed alone or together
with its value depending whether the value is available or not. Thus
documenting the case of the new "locked" attribute.
Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rafael Silva <rafaeloliveira.cs@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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c57b3367be (worktree: teach `list` to annotate locked worktree,
2020-10-11) introduced a new test to ensure locked worktrees are listed
with "locked" annotation. However, the test does not clean up after
itself as "git worktree prune" is not going to remove the locked worktree
in the first place. This not only leaves the test in an unclean state it
also potentially breaks following tests that rely on the
"git worktree list" output.
Let's fix that by unlocking the worktree before the "prune" command.
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rafael Silva <rafaeloliveira.cs@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Using "1~5" isn't portable. Nobody seems to have noticed, since perhaps
people don't tend to run the perf suite on more exotic platforms. Still,
it's better to set a good example.
We can use:
perl -ne 'print if $. % 5 == 1'
instead. But we can further observe that perl does a good job of the
other parts of this pipeline, and fold the whole thing together.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we expand a user-format, we try to avoid work that isn't necessary
for the output. For instance, we don't bother parsing the commit header
until we know we need the author, subject, etc.
But we do always load the commit object's contents from disk, even if
the format doesn't require it (e.g., just "%H"). Traditionally this
didn't matter much, because we'd have loaded it as part of the traversal
anyway, and we'd typically have those bytes attached to the commit
struct (or these days, cached in a commit-slab).
But when we have a commit-graph, we might easily get to the point of
pretty-printing a commit without ever having looked at the actual object
contents. We should push off that load (and reencoding) until we're
certain that it's needed.
I think the results of p4205 show the advantage pretty clearly (we serve
parent and tree oids out of the commit struct itself, so they benefit as
well):
# using git.git as the test repo
Test HEAD^ HEAD
----------------------------------------------------------------------
4205.1: log with %H 0.40(0.39+0.01) 0.03(0.02+0.01) -92.5%
4205.2: log with %h 0.45(0.44+0.01) 0.09(0.09+0.00) -80.0%
4205.3: log with %T 0.40(0.39+0.00) 0.04(0.04+0.00) -90.0%
4205.4: log with %t 0.46(0.46+0.00) 0.09(0.08+0.01) -80.4%
4205.5: log with %P 0.39(0.39+0.00) 0.03(0.03+0.00) -92.3%
4205.6: log with %p 0.46(0.46+0.00) 0.10(0.09+0.00) -78.3%
4205.7: log with %h-%h-%h 0.52(0.51+0.01) 0.15(0.14+0.00) -71.2%
4205.8: log with %an-%ae-%s 0.42(0.41+0.00) 0.42(0.41+0.01) +0.0%
# using linux.git as the test repo
Test HEAD^ HEAD
----------------------------------------------------------------------
4205.1: log with %H 7.12(6.97+0.14) 0.76(0.65+0.11) -89.3%
4205.2: log with %h 7.35(7.19+0.16) 1.30(1.19+0.11) -82.3%
4205.3: log with %T 7.58(7.42+0.15) 1.02(0.94+0.08) -86.5%
4205.4: log with %t 8.05(7.89+0.15) 1.55(1.41+0.13) -80.7%
4205.5: log with %P 7.12(7.01+0.10) 0.76(0.69+0.07) -89.3%
4205.6: log with %p 7.38(7.27+0.10) 1.32(1.20+0.12) -82.1%
4205.7: log with %h-%h-%h 7.81(7.67+0.13) 1.79(1.67+0.12) -77.1%
4205.8: log with %an-%ae-%s 7.90(7.74+0.15) 7.81(7.66+0.15) -1.1%
I added the final test to show where we don't improve (the 1% there is
just lucky noise), but also as a regression test to make sure we're not
doing anything stupid like loading the commit multiple times when there
are several placeholders that need it.
Reported-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In 6e98de72c03 (sequencer (rebase -i): add support for the 'fixup' and
'squash' commands, 2017-01-02), this developer introduced a change of
behavior by mistake: when encountering a `fixup!` commit (or multiple
`fixup!` commits) without any `squash!` commit thrown in, the final `git
commit` was invoked with `--cleanup=strip`. Prior to that commit, the
commit command had been called without that `--cleanup` option.
Since we explicitly read the original commit message from a file in that
case, there is really no sense in forcing that clean-up.
We actually need to actively suppress that clean-up lest a configured
`commit.cleanup` may interfere with what we want to do: leave the commit
message unchanged.
Reported-by: Vojtěch Knyttl <vojtech@knyt.tl>
Helped-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we use the sub-test helpers, we end up defining one shell snippet
inside another shell snippet. So if we use single-quotes for the outer
snippet, we have to use double-quotes within the inner snippet (it's
included as here-doc within the outer snippet, but using a single quote
would end the outer snippet early). Or vice versa we can use double
quotes for the outer snippet, but then single quotes in the inner.
We have some of each in the script, and neither is wrong. But it would
be nice to be consistent unless there is a good reason not to. Using
single quotes for the outer script is preferable, because it requires
less metacharacter quoting overall. For example, in:
test_expect_success 'outer' '
run_sub_test_lib_test ... <<-\EOF
echo $foo &&
test_expect_success "inner" "
echo \$bar
"
EOF
'
we need only quote inside "inner", but not inside "outer" or the
here-doc. Whereas if we flip them, we have to quote in both places:
test_expect_success 'outer' "
run_sub_test_lib_test ... <<-\EOF
echo \$foo &&
test_expect_success 'inner' '
echo \$bar
'
EOF
"
The exception is when we need a literal single-quote in an expected
output here-doc. There we can either use outer double-quotes, or just
use ${SQ} within the doc. I chose the latter for consistency (within
this test, but also with other test scripts that face the same problem).
There is one other interesting case, which is some tests that do:
test_expect_success ... "
do_something --run='"'!3'"'
"
This is rather confusing to read, but is correct. The outer script sees
'!3' in single-quotes, as does the eval'd snippet. This is perhaps being
overly cautious. In many interactive shells, an exclamation triggers
history expansion even inside double quotes, but that is not generally
true in non-interactive shells.
There's some conflicting information here. Commit 784ce03d55 (t4216:
avoid unnecessary subshell in test_bloom_filters_not_used, 2020-05-19)
reports it as a problem with OpenBSD 6.7's /bin/sh. However, we have
many instances in this script of prereqs like !LAZY_TRUE, which haven't
been a problem. I left them un-escaped here to test out this theory.
It's much nicer if we can not worry about this as a portability issue,
so it's worth knowing.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Our check of test_when_finished is done directly in the main script, and
if we failed to clean, we complain and exit immediately. It's nicer to
signal a test failure here, for a few reasons:
- this gives better output to the user when run under a TAP harness
like "prove"
- constency; it's the only test left in the file that behaves this way
- half of its "if" conditional is nonsense anyway; it picked up a
reference to GIT_TEST_FAIL_PREREQS_INTERNAL in dfe1a17df9 (tests:
add a special setup where prerequisites fail, 2019-05-13) along with
its neighbors, even though it has nothing to do with that flag
We could actually do this without a sub-test at all, and just put our
two tests (one to do cleanup, and one to check that it happened) in the
main script. But doing it in a subtest is conceptually cleaner (from the
perspective of the main test script, we are checking only one thing),
and it remains consistent with the "cleanup when failing" test directly
after it, which has to happen in a sub-test (to avoid the main script
complaining of the failed test).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We test the behavior of prerequisites in t0000 by setting up fake ones
in the main test script, trying to run some tests, and then seeing if
those tests impacted the environment correctly. If they didn't, then we
write a message and manually call exit.
Instead, let's push these down into a sub-test, like many of the other
tests covering the framework itself. This has a few advantages:
- it does not pollute the test output with mention of skipped tests
(that we know are uninteresting -- the point of the test was to see
that these are skipped).
- when running in a TAP harness, we get a useful test failure message
(whereas when the script exits early, a tool like "prove" simply
says "Dubious, test returned 1").
- we do not have to worry about different test environments, such as
when GIT_TEST_FAIL_PREREQS_INTERNAL is set. Our sub-test helpers
already give us a known environment.
- the tests themselves are a bit easier to read, as we can just check
the test-framework output to see what happened (and get the usual
test_cmp diff if it failed)
A few notes on the implementation:
- we could do one sub-test per each individual test_expect_success. I
broke it up here into a few logical groups, as I think this makes it
more readable
- the original tests modified environment variables inside the test
bodies. Instead, I've used "true" as the body of a test we expect to
run and "false" otherwise. Technically this does not confirm that
the body of the "true" test actually ran. We are trusting the
framework output to believe that it truly ran, which is sufficient
for these tests. And I think the end result is much simpler to
follow.
- the nested_prereq test uses a few bare "test -f" calls; I converted
these to our usual test_path_is_* helpers while moving the code
around.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We check that test_when_finished cleans up after a test, and that it
runs even after a failure. Those two were originally adjacent, but got
split apart by the new test added in 477dcaddb6 (tests: do not let lazy
prereqs inside `test_expect_*` turn off tracing, 2020-03-26), and then
further by more lazy-prereq tests. Let's move them back together.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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'./t1234-foo.sh --stress-jobs=X ...' is supposed to run that test
script in X parallel jobs, but the number of jobs specified on the
command line is entirely ignored if other '--stress'-related options
follow. I.e. both './t1234-foo.sh --stress-jobs=X --stress-limit=Y'
and './t1234-foo.sh --stress-jobs=X --stress' fall back to using twice
the number of CPUs parallel jobs instead.
The former has been broken since commit de69e6f6c9 (tests: let
--stress-limit=<N> imply --stress, 2019-03-03) [1], which started to
unconditionally overwrite the $stress variable holding the specified
number of jobs in its effort to imply '--stress'. The latter has been
broken since f545737144 (tests: introduce --stress-jobs=<N>,
2019-03-03), because it didn't consider that handling '--stress' will
overwrite that variable as well.
We could fix this by being more careful about (over)writing that
$stress variable and checking first whether it has already been set.
But I think it's cleaner to use a dedicated variable to hold the
number of specified parallel jobs, so let's do that instead.
[1] In de69e6f6c9 there was no '--stress-jobs=X' option yet, the
number of parallel jobs had to be specified via '--stress=X', so,
strictly speaking, de69e6f6c9 broke './t1234-foo.sh --stress=X
--stress-limit=Y'.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Follow-up fixes and improvements to ab/mailmap topic.
* ab/mailmap-fixup:
t4203: make blame output massaging more robust
mailmap doc: use correct environment variable 'GIT_WORK_TREE'
t4203: stop losing return codes of git commands
test-lib-functions.sh: fix usage for test_commit()
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Introduce two new ways to feed configuration variable-value pairs
via environment variables, and tweak the way GIT_CONFIG_PARAMETERS
encodes variable/value pairs to make it more robust.
* ps/config-env-pairs:
config: allow specifying config entries via envvar pairs
environment: make `getenv_safe()` a public function
config: store "git -c" variables using more robust format
config: parse more robust format in GIT_CONFIG_PARAMETERS
config: extract function to parse config pairs
quote: make sq_dequote_step() a public function
config: add new way to pass config via `--config-env`
git: add `--super-prefix` to usage string
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"git bundle" learns "--stdin" option to read its refs from the
standard input. Also, it now does not lose refs whey they point
at the same object.
* jx/bundle:
bundle: arguments can be read from stdin
bundle: lost objects when removing duplicate pendings
test: add helper functions for git-bundle
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Clean-up docs, codepaths and tests around mailmap.
* ab/mailmap: (22 commits)
shortlog: remove unused(?) "repo-abbrev" feature
mailmap doc + tests: document and test for case-insensitivity
mailmap tests: add tests for empty "<>" syntax
mailmap tests: add tests for whitespace syntax
mailmap tests: add a test for comment syntax
mailmap doc + tests: add better examples & test them
tests: refactor a few tests to use "test_commit --append"
test-lib functions: add an --append option to test_commit
test-lib functions: add --author support to test_commit
test-lib functions: document arguments to test_commit
test-lib functions: expand "test_commit" comment template
mailmap: test for silent exiting on missing file/blob
mailmap tests: get rid of overly complex blame fuzzing
mailmap tests: add a test for "not a blob" error
mailmap tests: remove redundant entry in test
mailmap tests: improve --stdin tests
mailmap tests: modernize syntax & test idioms
mailmap tests: use our preferred whitespace syntax
mailmap doc: start by mentioning the comment syntax
check-mailmap doc: note config options
...
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"git fetch" learns to treat ref updates atomically in all-or-none
fashion, just like "git push" does, with the new "--atomic" option.
* ps/fetch-atomic:
fetch: implement support for atomic reference updates
fetch: allow passing a transaction to `s_update_ref()`
fetch: refactor `s_update_ref` to use common exit path
fetch: use strbuf to format FETCH_HEAD updates
fetch: extract writing to FETCH_HEAD
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When more than one commit with the same patch ID appears on one
side, "git log --cherry-pick A...B" did not exclude them all when a
commit with the same patch ID appears on the other side. Now it
does.
* jk/log-cherry-pick-duplicate-patches:
patch-ids: handle duplicate hashmap entries
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Prepare tests not to be affected by the name of the default branch
"git init" creates.
* js/default-branch-name-tests-final-stretch: (28 commits)
tests: drop prereq `PREPARE_FOR_MAIN_BRANCH` where no longer needed
t99*: adjust the references to the default branch name "main"
tests(git-p4): transition to the default branch name `main`
t9[5-7]*: adjust the references to the default branch name "main"
t9[0-4]*: adjust the references to the default branch name "main"
t8*: adjust the references to the default branch name "main"
t7[5-9]*: adjust the references to the default branch name "main"
t7[0-4]*: adjust the references to the default branch name "main"
t6[4-9]*: adjust the references to the default branch name "main"
t64*: preemptively adjust alignment to prepare for `master` -> `main`
t6[0-3]*: adjust the references to the default branch name "main"
t5[6-9]*: adjust the references to the default branch name "main"
t55[4-9]*: adjust the references to the default branch name "main"
t55[23]*: adjust the references to the default branch name "main"
t551*: adjust the references to the default branch name "main"
t550*: adjust the references to the default branch name "main"
t5503: prepare aligned comment for replacing `master` with `main`
t5[0-4]*: adjust the references to the default branch name "main"
t5323: prepare centered comment for `master` -> `main`
t4*: adjust the references to the default branch name "main"
...
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Elijah Newren
Junio C Hamano
Johannes Sixt
Rafael Silva
Jeff King
Johannes Schindelin
SZEDER Gábor