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Earlier, to countermand the implicit "-m" option when the
"--first-parent" option is used with "git log", we added the
"--[no-]diff-merges" option in the jk/log-fp-implies-m topic. To
leave the door open to allow the "--diff-merges" option to take
values that instructs how patches for merge commits should be
computed (e.g. "cc"? "-p against first parent?"), redefine
"--diff-merges" to take non-optional value, and implement "off"
that means the same thing as "--no-diff-merges".
* so/log-diff-merges-opt:
t/t4013: add test for --diff-merges=off
doc/git-log: describe --diff-merges=off
revision: change "--diff-merges" option to require parameter
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"git log --first-parent -p" showed patches only for single-parent
commits on the first-parent chain; the "--first-parent" option has
been made to imply "-m". Use "--no-diff-merges" to restore the
previous behaviour to omit patches for merge commits.
* jk/log-fp-implies-m:
doc/git-log: clarify handling of merge commit diffs
doc/git-log: move "-t" into diff-options list
doc/git-log: drop "-r" diff option
doc/git-log: move "Diff Formatting" from rev-list-options
log: enable "-m" automatically with "--first-parent"
revision: add "--no-diff-merges" option to counteract "-m"
log: drop "--cc implies -m" logic
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Test framework update.
* es/test-cmp-typocatcher:
test_cmp: diagnose incorrect arguments
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Recent versions of "git diff-files" shows a diff between the index
and the working tree for "intent-to-add" paths as a "new file"
patch; "git apply --cached" should be able to take "git diff-files"
and should act as an equivalent to "git add" for the path, but the
command failed to do so for such a path.
* rp/apply-cached-with-i-t-a:
t4140: test apply with i-t-a paths
apply: make i-t-a entries never match worktree
apply: allow "new file" patches on i-t-a entries
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"git bisect" learns the "--first-parent" option to find the first
breakage along the first-parent chain.
* al/bisect-first-parent:
bisect: combine args passed to find_bisection()
bisect: introduce first-parent flag
cmd_bisect__helper: defer parsing no-checkout flag
rev-list: allow bisect and first-parent flags
t6030: modernize "git bisect run" tests
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Further preliminary change to refs API.
* hn/reftable-prep-part-2:
Make HEAD a PSEUDOREF rather than PER_WORKTREE.
Modify pseudo refs through ref backend storage
t1400: use git rev-parse for testing PSEUDOREF existence
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Stop when "sendmail.*" configuration variables are defined, which
could be a mistaken attempt to define "sendemail.*" variables.
* dd/send-email-config:
git-send-email: die if sendmail.* config is set
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The logic to find the ref transaction hook script attempted to
cache the path to the found hook without realizing that it needed
to keep a copied value, as the API it used returned a transitory
buffer space. This has been corrected.
* ps/ref-transaction-hook:
t1416: avoid hard-coded sha1 ids
refs: fix interleaving hook calls with reference-transaction hook
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Test cleanup.
* ma/test-quote-cleanup:
t4104: modernize and simplify quoting
t: don't spuriously close and reopen quotes
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A new helper function has_object() has been introduced to make it
easier to mark object existence checks that do and don't want to
trigger lazy fetches, and a few such checks are converted using it.
* jt/has_object:
fsck: do not lazy fetch known non-promisor object
pack-objects: no fetch when allow-{any,promisor}
apply: do not lazy fetch when applying binary
sha1-file: introduce no-lazy-fetch has_object()
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The component to respond to "git fetch" request is made more
configurable to selectively allow or reject object filtering
specification used for partial cloning.
* tb/upload-pack-filters:
t5616: use test_i18ngrep for upload-pack errors
upload-pack.c: introduce 'uploadpackfilter.tree.maxDepth'
upload-pack.c: allow banning certain object filter(s)
list_objects_filter_options: introduce 'list_object_filter_config_name'
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The final leg of SHA-256 transition.
* bc/sha-256-part-3: (39 commits)
t: remove test_oid_init in tests
docs: add documentation for extensions.objectFormat
ci: run tests with SHA-256
t: make SHA1 prerequisite depend on default hash
t: allow testing different hash algorithms via environment
t: add test_oid option to select hash algorithm
repository: enable SHA-256 support by default
setup: add support for reading extensions.objectformat
bundle: add new version for use with SHA-256
builtin/verify-pack: implement an --object-format option
http-fetch: set up git directory before parsing pack hashes
t0410: mark test with SHA1 prerequisite
t5308: make test work with SHA-256
t9700: make hash size independent
t9500: ensure that algorithm info is preserved in config
t9350: make hash size independent
t9301: make hash size independent
t9300: use $ZERO_OID instead of hard-coded object ID
t9300: abstract away SHA-1-specific constants
t8011: make hash size independent
...
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Signed-off-by: Sergey Organov <sorganov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The test added by e5256c82e5 (refs: fix interleaving hook calls with
reference-transaction hook, 2020-08-07) uses hard-coded sha1 object ids
in its expected output. This causes it to fail when run with
GIT_TEST_DEFAULT_HASH=sha256.
Let's make use of the oid variables we define earlier, as the rest of
the nearby tests do.
Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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All "mergy" operations that internally use the merge-recursive
machinery should honor the merge.renormalize configuration, but
many of them didn't.
* en/eol-attrs-gotchas:
checkout: support renormalization with checkout -m <paths>
merge: make merge.renormalize work for all uses of merge machinery
t6038: remove problematic test
t6038: make tests fail for the right reason
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Test fix.
* ma/t1450-quotefix:
t1450: fix quoting of NUL byte when corrupting pack
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The argv_array API is useful for not just managing argv but any
"vector" (NULL-terminated array) of strings, and has seen adoption
to a certain degree. It has been renamed to "strvec" to reduce the
barrier to adoption.
* jk/strvec:
strvec: rename struct fields
strvec: drop argv_array compatibility layer
strvec: update documention to avoid argv_array
strvec: fix indentation in renamed calls
strvec: convert remaining callers away from argv_array name
strvec: convert more callers away from argv_array name
strvec: convert builtin/ callers away from argv_array name
quote: rename sq_dequote_to_argv_array to mention strvec
strvec: rename files from argv-array to strvec
argv-array: rename to strvec
argv-array: use size_t for count and alloc
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Under normal circumstances, if a test author misspells a filename passed
to test_cmp(), the error is quickly discovered when the test fails
unexpectedly due to test_cmp() being unable to find the file. However,
if the test is expected to fail, as with test_expect_failure(), a
misspelled filename as argument to test_cmp() will go unnoticed since
the test will indeed fail, but for the wrong reason. Make it easier for
test authors to discover such problems early by sanity-checking the
arguments to test_cmp(). To avoid penalizing all clients of test_cmp()
in the general case, only check for missing files if the comparison
fails.
While at it, make test_cmp_bin() sanity-check its arguments, as well.
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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apply --cached (as used by add -p) should accept creation and deletion
patches to intent-to-add paths in the index. apply --index, however,
should always fail because an intent-to-add path never matches the
worktree (by definition).
Based-on-patch-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Raymond E. Pasco <ray@ameretat.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Upon seeing a merge commit when bisecting, this option may be used to
follow only the first parent.
In detecting regressions introduced through the merging of a branch, the
merge commit will be identified as introduction of the bug and its
ancestors will be ignored.
This option is particularly useful in avoiding false positives when a
merged branch contained broken or non-buildable commits, but the merge
itself was OK.
Signed-off-by: Aaron Lipman <alipman88@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add first_parent_only parameter to find_bisection(), removing the
barrier that prevented combining the --bisect and --first-parent flags
when using git rev-list
Based-on-patch-by: Tiago Botelho <tiagonbotelho@hotmail.com>
Signed-off-by: Aaron Lipman <alipman88@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Enforce consistent styling for tests on "git bisect run":
- Use "write_script" to abstract away platform-specific details.
- Favor current whitespace conventions.
- While at it, change "introduced" to "added" in the comments to make
them read better.
Helped-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Aaron Lipman <alipman88@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In order to not repeatedly search for the reference-transaction hook in
case it's getting called multiple times, we use a caching mechanism to
only call `find_hook()` once. What was missed though is that the return
value of `find_hook()` actually comes from a static strbuf, which means
it will get overwritten when calling `find_hook()` again. As a result,
we may call the wrong hook with parameters of the reference-transaction
hook.
This scenario was spotted in the wild when executing a git-push(1) with
multiple references, where there are interleaving calls to both the
update and the reference-transaction hook. While initial calls to the
reference-transaction hook work as expected, it will stop working after
the next invocation of the update hook. The result is that we now start
calling the update hook with parameters and stdin of the
reference-transaction hook.
This commit fixes the issue by storing a copy of `find_hook()`'s return
value in the cache.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Drop whitespace in the value of `$test_description` and in a test body
and use `test_write_lines`.
Stop defining `$u` with a trailing space just so that we can tuck it in
like `git foo $u$more...` and get minimal whitespace in the command:
`git foo $u $more...` is more readable at the "cost" of an empty `$u`
yielding `git foo something...`.
Finally, avoid using single quotes within the test scripts to repeatedly
close and reopen the quotes that wrap the test scripts (see the previous
commit). This "unnecessary" quoting does mean that the verbose test
output shows the interpolated values, i.e., the shell code we're
running. But the downside is that the source of the script does *not*
show the shell code we're eventually executing, leaving the reader to
reason about what we really do and whether there are any quoting issues.
(There aren't.)
Where we run through loops to generate several "identical but different"
tests, the test message contains the interpolated variables we're
looping on, meaning one can always identify exactly which instance has
failed, even if the verbose test output shows the exact same test body
several times.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In the test scripts, the recommended style is, e.g.:
test_expect_success 'name' '
do-something somehow &&
do-some-more testing
'
When using this style, any single quote in the multi-line test section
is actually closing the lone single quotes that surround it.
It can be a non-issue in practice:
test_expect_success 'sed a little' '
sed -e 's/hi/lo/' in >out # "ok": no whitespace in s/hi/lo/
'
Or it can be a bug in the test, e.g., because variable interpolation
happens before the test even begins executing:
v=abc
test_expect_success 'variable interpolation' '
v=def &&
echo '"$v"' # abc
'
Change several such in-test single quotes to use double quotes instead
or, in a few cases, drop them altogether. These were identified using
some crude grepping. We're not fixing any test bugs here, but we're
hopefully making these tests slightly easier to grok and to maintain.
There are legitimate use cases for closing a quote and opening a new
one, e.g., both '\'' and '"'"' can be used to produce a literal single
quote. I'm not touching any of those here.
In t9401, tuck the redirecting ">" to the filename while we're touching
those lines.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When applying a binary patch, as an optimization, "apply" checks if the
postimage is already present. During this fetch, it is perfectly
expected for the postimage not to be present, so there is no need to
lazy-fetch missing objects. Teach "apply" not to lazy-fetch in this
case.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The tests added to t5616 in 6dd3456a8c (upload-pack.c: allow banning
certain object filter(s), 2020-08-03) can fail racily, but only with
GETTEXT_POISON enabled.
The tests in question look something like this:
test_must_fail ok=sigpipe git clone --filter=blob:none ... 2>err &&
grep "filter blob:none not supported' err
The remote upload-pack process writes that error message both as an ERR
packet, but also via a die() message. In theory we should see the
message twice in the "err" file. The client relays the message from the
packet to its stderr (with a "remote error:" prefix), and because this
is a local-system clone, upload-pack's stderr goes to the same place.
But because clone may be writing to the pipe when upload-pack calls
die(), it may get SIGPIPE and fail to relay the message. That's why we
need our "ok=sigpipe" trick. But our grep should still work reliably in
that case. Either:
- we got SIGPIPE on the client, which means upload-pack completed its
die(), and we'll see that version of the message.
- the client didn't get SIGPIPE, and so it successfully relays the
message.
In theory we'd see both copies of the message in the second case. But
now always! As soon as the client sees ERR, it exits and we run grep.
But we have no guarantee that the upload-pack process has exited at this
point, or even written its die() message. We might only see the client
version of the message.
Normally that's OK. We only need to see one or the other to pass the
test. But now consider GETTEXT_POISON. upload-pack doesn't translate the
die() message nor the ERR packet. But once the client receives it, it
calls:
die(_("remote error: %s"), buffer + 4);
That message _is_ marked for translation. Normally we'd just replace the
"remote error:" portion of it, but in GETTEXT_POISON mode, we replace
the whole thing with "# GETTEXT POISON #" and don't include the "%s"
part at all. So the whole text from the ERR packet is dropped, and so we
may racily see a test failure if upload-pack's die() call wasn't yet
written.
We can fix it by using test_i18ngrep, which just makes this grep a noop
in the poison mode.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The pretend-object mechanism checks if the given object already
exists in the object store before deciding to keep the data
in-core, but the check would have triggered lazy fetching of such
an object from a promissor remote.
* jt/pretend-object-never-come-from-elsewhere:
sha1-file: make pretend_object_file() not prefetch
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While packing many objects in a repository with a promissor remote,
lazily fetching missing objects from the promissor remote one by
one may be inefficient---the code now attempts to fetch all the
missing objects in batch (obviously this won't work for a lazy
clone that lazily fetches tree objects as you cannot even enumerate
what blobs are missing until you learn which trees are missing).
* jt/pack-objects-prefetch-in-batch:
pack-objects: prefetch objects to be packed
pack-objects: refactor to oid_object_info_extended
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In b79cf959b2 (upload-pack.c: allow banning certain object filter(s),
2020-02-26), we introduced functionality to disallow certain object
filters from being chosen from within 'git upload-pack'. Traditionally,
administrators use this functionality to disallow filters that are known
to perform slowly, for e.g., those that do not have bitmap-level
filtering.
In the past, the '--filter=tree:<n>' was one such filter that does not
have bitmap-level filtering support, and so was likely to be banned by
administrators.
However, in the previous couple of commits, we introduced bitmap-level
filtering for the case when 'n' is equal to '0', i.e., as if we had a
'--filter=tree:none' choice.
While it would be sufficient to simply write
$ git config uploadpackfilter.tree.allow true
(since it would allow all values of 'n'), we would like to be able to
allow this filter for certain values of 'n', i.e., those no greater than
some pre-specified maximum.
In order to do this, introduce a new configuration key, as follows:
$ git config uploadpackfilter.tree.maxDepth <m>
where '<m>' specifies the maximum allowed value of 'n' in the filter
'tree:n'. Administrators who wish to allow for only the value '0' can
write:
$ git config uploadpackfilter.tree.allow true
$ git config uploadpackfilter.tree.maxDepth 0
which allows '--filter=tree:0', but no other values.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Git clients may ask the server for a partial set of objects, where the
set of objects being requested is refined by one or more object filters.
Server administrators can configure 'git upload-pack' to allow or ban
these filters by setting the 'uploadpack.allowFilter' variable to
'true' or 'false', respectively.
However, administrators using bitmaps may wish to allow certain kinds of
object filters, but ban others. Specifically, they may wish to allow
object filters that can be optimized by the use of bitmaps, while
rejecting other object filters which aren't and represent a perceived
performance degradation (as well as an increased load factor on the
server).
Allow configuring 'git upload-pack' to support object filters on a
case-by-case basis by introducing two new configuration variables:
- 'uploadpackfilter.allow'
- 'uploadpackfilter.<kind>.allow'
where '<kind>' may be one of 'blobNone', 'blobLimit', 'tree', and so on.
Setting the second configuration variable for any valid value of
'<kind>' explicitly allows or disallows restricting that kind of object
filter.
If a client requests the object filter <kind> and the respective
configuration value is not set, 'git upload-pack' will default to the
value of 'uploadpackfilter.allow', which itself defaults to 'true' to
maintain backwards compatibility. Note that this differs from
'uploadpack.allowfilter', which controls whether or not the 'filter'
capability is advertised.
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The 'merge' command is not the only one that does merges; other commands
like checkout -m or rebase do as well. Unfortunately, the only area of
the code that checked for the "merge.renormalize" config setting was in
builtin/merge.c, meaning it could only affect merges performed by the
"merge" command. Move the handling of this config setting to
merge_recursive_config() so that other commands can benefit from it as
well. Fixes a few tests in t6038.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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t6038.11, 'cherry-pick patch from after text=auto' was a test of
undefined behavior. To make matters worse, while there are a couple
possible correct answers, this test was coded to only check for an
obviously incorrect answer. And the final cherry on top is that the
test is marked test_expect_failure, meaning it can't provide much value,
other than possibly confusing future folks who come along and try to
work on attributes and look at existing tests. Because of all these
problems, just remove the test.
But for any future code spelunkers, here's my understanding of the two
possible correct answers:
This test was set up so that on a branch with no .gitattributes file,
you cherry-picked a patch from a branch that had a .gitattributes file
(containing '* text=auto'). Further, the two branches had a file which
differed only in line endings. In this situation, correct behavior is
not well defined: should the .gitattributes file affect the merge or
not?
If the .gitattributes file on the other branch should not affect the
merge, then we would have a content conflict with all three stages
different (the merge base didn't match either side).
If the .gitattributes file from the other branch should affect the
merge, then we would expect the line endings to be normalized to LF for
the version to be recorded in the repository. This would mean that when
doing a three-way content merge on the file that differed in line
endings, that the three-way content merge would see that the versions on
both sides matched and so the cherry-pick has no conflicts and can
succeed. The line endings in the file as recorded in the repository
will change from CRLF to LF. The version checked out in the working
copy will depend on the platform (since there's no eol attribute defined
for the file).
Also, as a final side note, this test expected an error message that was
built assuming cherry-pick was the old scripted version, because
cherry-pick no longer uses the error message that was encoded in this
test. So it was wrong for yet another reason.
Given that the handling of .gitattributes is not well defined and this
test was obviously broken and could do nothing but confuse future
readers, just remove it.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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t6038 had a pair of tests that were expected to fail, but weren't
failing for the expected reason. Both were meant to do a merge that
could be done cleanly after renormalization, but were supposed to fail
for lack of renormalization. Unfortunately, both tests had staged
changes, and checkout -m would abort due to the presence of those staged
changes before even attempting a merge.
Fix this first issue by utilizing git-restore instead of git-checkout,
so that the index is left alone and just the working directory gets the
changes we want.
However, there is a second issue with these tests. Technically, they
just wanted to verify that after renormalization, no conflicts would be
present. This could have been checked for by grepping for a lack of
conflict markers, but the test instead tried to compare the working
directory files to an expected result. Unfortunately, the setting of
"text=auto" without setting core.eol to any value meant that the content
of the file (in particular, the line endings) would be
platform-dependent and the tests could only pass on some platforms.
Replace the existing comparison with a call to 'git diff --no-index
--ignore-cr-at-eol' to verify that the contents, other than possible
carriage returns in the file, match the expected results and in
particular that the file has no conflicts from the checkout -m
operation.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We use
printf '\0'
to generate a NUL byte which we then `dd` into the packfile to ensure
that we modify the first byte of the first object, thereby
(probabilistically) invalidating the checksum. Except the single quotes
we're using are interpreted to match with the ones we enclose the whole
test in. So we actually execute
printf \0
and end up injecting the ASCII code for "0", 0x30, instead.
The comment right above this `printf` invocation says that "at least one
of [the type bits] is not zero, so setting the first byte to 0 is
sufficient". Substituting "0x30" for "0" in that comment won't do: we'd
need to reason about which bits go where and just what the packfile
looks like that we're modifying in this test.
Let's avoid all of that by actually executing
printf "\0"
to generate a NUL byte, as intended.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Brown-paper-bag fix.
* cc/pretty-contents-size:
t6300: fix issues related to %(contents:size)
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"git merge" learned to selectively omit " into <branch>" at the end
of the title of default merge message with merge.suppressDest
configuration.
* jc/fmt-merge-msg-suppress-destination:
fmt-merge-msg: allow merge destination to be omitted again
Revert "fmt-merge-msg: stop treating `master` specially"
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b6839fda68 (ref-filter: add support for %(contents:size), 2020-07-16)
added a new format for ref-filter, and added a function to generate
tests for this new feature in t6300. Unfortunately, it tries to run
`test_expect_sucess' instead of `test_expect_success', and writes
$expect to `expected', but tries to read `expect'. Those two issues
were probably unnoticed because the script only printed errors, but did
not crash. This fixes these issues.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* en/typofixes:
hashmap: fix typo in usage docs
Remove doubled words in various comments
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The "argc" and "argv" names made sense when the struct was argv_array,
but now they're just confusing. Let's rename them to "nr" (which we use
for counts elsewhere) and "v" (which is rather terse, but reads well
when combined with typical variable names like "args.v").
Note that we have to update all of the callers immediately. Playing
tricks with the preprocessor is hard here, because we wouldn't want to
rewrite unrelated tokens.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Fix to a regression introduced during 2.27 cycle.
* en/fill-directory-exponential:
dir: check pathspecs before returning `path_excluded`
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"git mv src dst", when src is an unmerged path, errored out
correctly but with an incorrect error message to claim that src is
not tracked, which has been clarified.
* ct/mv-unmerged-path-error:
git-mv: improve error message for conflicted file
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Pushing a ref whose name contains non-ASCII character with the
"--force-with-lease" option did not work over smart HTTP protocol,
which has been corrected.
* bc/push-cas-cquoted-refname:
remote-curl: make --force-with-lease work with non-ASCII ref names
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"git for-each-ref --format=<>" learned %(contents:size).
* cc/pretty-contents-size:
ref-filter: add support for %(contents:size)
t6300: test refs pointing to tree and blob
Documentation: clarify %(contents:XXXX) doc
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Fetching from a lazily cloned repository resulted at the server
side in attempts to lazy fetch objects that the client side has,
many of which will not be available from the third-party anyway.
* jt/avoid-lazy-fetching-upon-have-check:
upload-pack: do not lazy-fetch "have" objects
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Dev support to limit the use of test_must_fail to only git commands.
* dl/test-must-fail-fixes-6:
test-lib-functions: restrict test_must_fail usage
t9400: don't use test_must_fail with cvs
t9834: remove use of `test_might_fail p4`
t7107: don't use test_must_fail()
t5324: reorder `run_with_limited_open_files test_might_fail`
t3701: stop using `env` in force_color()
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With the base fix to 2.27 regresion, any new extensions in a v0
repository would still be silently honored, which is not quite
right. Instead, complain and die loudly.
* jk/reject-newer-extensions-in-v0:
verify_repository_format(): complain about new extensions in v0 repo
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Preliminary clean-up of the refs API in preparation for adding a
new refs backend "reftable".
* hn/reftable:
reflog: cleanse messages in the refs.c layer
bisect: treat BISECT_HEAD as a pseudo ref
t3432: use git-reflog to inspect the reflog for HEAD
lib-t6000.sh: write tag using git-update-ref
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"git clone --separate-git-dir=$elsewhere" used to stomp on the
contents of the existing directory $elsewhere, which has been
taught to fail when $elsewhere is not an empty directory.
* bw/fail-cloning-into-non-empty:
git clone: don't clone into non-empty directory
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The test framework has been updated so that most tests will run
with predictable (artificial) timestamps.
* jk/tests-timestamp-fix:
t9100: stop depending on commit timestamps
test-lib: set deterministic default author/committer date
t9100: explicitly unset GIT_COMMITTER_DATE
t5539: make timestamp requirements more explicit
t9700: loosen ident timezone regex
t6000: use test_tick consistently
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