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Author SHA1 Message Date
Ævar Arnfjörð Bjarmason c49a177bec test-lib.sh: set COLUMNS=80 for --verbose repeatability
Some tests will fail under --verbose because while we've unset COLUMNS
since b1d645b58a (tests: unset COLUMNS inherited from environment,
2012-03-27), we also look for the columns with an ioctl(..,
TIOCGWINSZ, ...) on some platforms. By setting COLUMNS again we
preempt the TIOCGWINSZ lookup in pager.c's term_columns(), it'll take
COLUMNS over TIOCGWINSZ,

This fixes t0500-progress-display.sh., which broke because of a
combination of the this issue and the progress output reacting to the
column width since 545dc345eb (progress: break too long progress bar
lines, 2019-04-12). The t5324-split-commit-graph.sh fails in a similar
manner due to progress output, see [1] for details.

The issue is not specific to progress.c, the diff code also checks
COLUMNS and some of its tests can be made to fail in a similar
manner[2], anything that invokes a pager is potentially affected.

See ea77e675e5 (Make "git help" react to window size correctly,
2005-12-18) and ad6c3739a3 (pager: find out the terminal width before
spawning the pager, 2012-02-12) for how the TIOCGWINSZ code ended up
in pager.c

1. http://lore.kernel.org/git/20210624051253.GG6312@szeder.dev
2. https://lore.kernel.org/git/20210627074419.GH6312@szeder.dev/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-29 13:06:30 -07:00
Ævar Arnfjörð Bjarmason 7b76d6bf22 Makefile: add and use the ".DELETE_ON_ERROR" flag
Use the GNU make ".DELETE_ON_ERROR" flag in our main Makefile, as we
already do in the Documentation/Makefile since db10fc6c09 (doc:
simplify Makefile using .DELETE_ON_ERROR, 2021-05-21).

Now if a command to make X fails X will be removed, the default
behavior of GNU make is to only do so if "make" itself is interrupted
with a signal.

E.g. if we now intentionally break one of the rules with:

    -       mv $@+ $@
    +       mv $@+ $@ && \
    +       false

We'll get output like:

    $ make git
        CC git.o
        LINK git
    make: *** [Makefile:2179: git] Error 1
    make: *** Deleting file 'git'
    $ file git
    git: cannot open `git' (No such file or directory)

Before this change we'd leave the file in place in under this
scenario.

As in db10fc6c09 this allows us to remove patterns of removing
leftover $@ files at the start of rules, since previous failing runs
of the Makefile won't have left those littered around anymore.

I'm not as confident that we should be replacing the "mv $@+ $@"
pattern entirely, since that means that external programs or one of
our other Makefiles might race and get partial content.

I'm not changing $(REMOTE_CURL_ALIASES) since that uses a ln/ln -s/cp
dance, and would require the addition of "-f" flags if the "rm" at the
start was removed. I've also got plans to fix that ln/ln -s/cp pattern
in another series.

For $(LIB_FILE) and $(XDIFF_LIB) we can rely on the "c" (create) being
present in ARFLAGS.

I'm not changing "$(ETAGS_TARGET)", "tags" and "cscope" because
they've got a messy combination of removing "$@+" not "$@" at the
beginning, or "$@*". I'm also addressing those in another series.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-29 08:03:45 -07:00
Taylor Blau f89ecf7988 midx: report checksum mismatches during 'verify'
'git multi-pack-index verify' inspects the data in an existing MIDX for
correctness by checking that the recorded object offsets are correct,
and so on.

But it does not check that the file's trailing checksum matches the data
that it records. So, if an on-disk corruption happened to occur in the
final few bytes (and all other data was recorded correctly), we would:

  - get a clean result from 'git multi-pack-index verify', but
  - be unable to reuse the existing MIDX when writing a new one (since
    we now check for checksum mismatches before reusing a MIDX)

Teach the 'verify' sub-command to recognize corruption in the checksum
by calling midx_checksum_valid().

Suggested-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:36:17 -07:00
Taylor Blau ec1e28ef9c midx: don't reuse corrupt MIDXs when writing
When writing a new multi-pack index, Git tries to reuse as much of the
data from an existing MIDX as possible, like object offsets. This is
done to avoid re-opening a bunch of *.idx files unnecessarily, but can
lead to problems if the data we are reusing is corrupt.

That's because we'll blindly reuse data from an existing MIDX without
checking its trailing checksum for validity. So if there is memory
corruption while writing a MIDX, or disk corruption in the intervening
period between writing and reuse, we'll blindly propagate those bad
values forward.

Suppose we experience a memory corruption while writing a MIDX such that
we write an incorrect object offset (or alternatively, the disk corrupts
the data after being written, but before being reused). Then when we go
to write a new MIDX, we'll reuse the bad object offset without checking
its validity. This means that the MIDX we just wrote is broken, but its
trailing checksum is in-tact, since we never bothered to look at the
values before writing.

In the above, a "git multi-pack-index verify" would have caught the
problem before writing, but writing a new MIDX wouldn't have noticed
anything wrong, blindly carrying forward the corrupt offset.

Individual pack indexes check their validity by verifying the crc32
attached to each entry when carrying data forward during a repack.
We could solve this problem for MIDXs in the same way, but individual
crc32's don't make much sense, since their entries are so small.
Likewise, checking the whole file on every read may be prohibitively
expensive if a repository has a lot of objects, packs, or both.

But we can check the trailing checksum when reusing an existing MIDX
when writing a new one. And a corrupt MIDX need not stop us from writing
a new one, since we can just avoid reusing the existing one at all and
pretend as if we are writing a new MIDX from scratch.

Suggested-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:36:17 -07:00
Taylor Blau 15316a4732 commit-graph: rewrite to use checksum_valid()
Rewrite an existing caller in `git commit-graph verify` to take
advantage of checksum_valid().

Note that the replacement isn't a verbatim cut-and-paste, since the new
function avoids using hashfile at all and instead talks to the_hash_algo
directly, but it is functionally equivalent.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:36:17 -07:00
Taylor Blau f9221e2cf5 csum-file: introduce checksum_valid()
Introduce a new function which checks the validity of a file's trailing
checksum. This is similar to hashfd_check(), but different since it is
intended to be used by callers who aren't writing the same data (like
`git index-pack --verify`), but who instead want to validate the
integrity of data that they are reading.

Rewrite the first of two callers which could benefit from this new
function in pack-check.c. Subsequent callers will be added in the
following patches.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:36:17 -07:00
Kaartic Sivaraam 1cf823d8f0 submodule: remove unnecessary `prefix` based option logic
Over time when parts of submodule have been ported from shell to
builtin, many instances of the submodule helper have been added.
Also added with them are some unnecessary option passing
logic that are based on the `prefix` shell variable which never
gets set in their code flows.

On analysis, the only shell functions which have a valid usage
for the `prefix` shell variable are:

    - cmd_update: which is the only function which sets the variable
      and thus uses it properly

    - cmd_init: which uses the variable via a call from cmd_update

So, remove the unnecessary option parsing logic based on the `prefix`
shell variable.

Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:28:19 -07:00
Johannes Schindelin e355307692 config: normalize the path of the system gitconfig
Git for Windows is compiled with a runtime prefix, and that runtime
prefix is typically `C:/Program Files/Git/mingw64`. As we want the
system gitconfig to live in the sibling directory `etc`, we define the
relative path as `../etc/gitconfig`.

However, as reported by Philip Oakley, the output of `git config
--show-origin --system -l` looks rather ugly, as it shows the path as
`file:C:/Program Files/Git/mingw64/../etc/gitconfig`, i.e. with the
`mingw64/../` part.

By normalizing the path, we get a prettier path.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:11:51 -07:00
Dennis Ameling 50101b93ca cmake(windows): set correct path to the system Git config
Currently, when Git for Windows is built with CMake, the system Git config is
expected in a different location than when building via `make`: the former
expects it to be in `<runtime-prefix>/mingw64/etc/gitconfig`, the latter in
`<runtime-prefix>/etc/gitconfig`.

Because of this, things like `git clone` do not work correctly (because cURL is
no longer able to find its certificate bundle that it needs to validate HTTPS
certificates). See the full bug report and discussion here:
https://github.com/git-for-windows/git/issues/3071#issuecomment-789261386.

This commit aligns the CMake-based build by mimicking what is already done in
`config.mak.uname`.

This closes https://github.com/git-for-windows/git/issues/3071.

Signed-off-by: Dennis Ameling <dennis@dennisameling.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:11:50 -07:00
Johannes Schindelin fb5e3378f8 mingw: move Git for Windows' system config where users expect it
Git for Windows' prefix is `/mingw64/` (or `/mingw32/` for 32-bit
versions), therefore the system config is located at the clunky location
`C:\Program Files\Git\mingw64\etc\gitconfig`.

This moves the system config into a more logical location: the `mingw64`
part of `C:\Program Files\Git\mingw64\etc\gitconfig` never made sense,
as it is a mere implementation detail. Let's skip the `mingw64` part and
move this to `C:\Program Files\Git\etc\gitconfig`.

Side note: in the rare (and not recommended) case a user chooses to
install 32-bit Git for Windows on a 64-bit system, the path will of
course be `C:\Program Files (x86)\Git\etc\gitconfig`.

Background: During the Git for Windows v1.x days, the system config was
located at `C:\Program Files (x86)\Git\etc\gitconfig`. With Git for
Windows v2.x, it moved to `C:\Program Files\Git\mingw64\gitconfig` (or
`C:\Program Files (x86)\Git\mingw32\gitconfig`). Rather than fixing it
back then, we tried to introduce a "Windows-wide" config, but that never
caught on.

Likewise, we move the system `gitattributes` into the same directory.

Obviously, we are cautious to do this only for the known install
locations `/mingw64` and `/mingw32`; If anybody wants to override that
while building their version of Git (e.g. via `make prefix=$HOME`), we
leave the default location of the system config and gitattributes alone.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:11:48 -07:00
Carlo Marcelo Arenas Belón ebbf5d2b70 config.mak.uname: PCRE1 cleanup
Style issue: a space was missing.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 20:10:47 -07:00
Beshr Kayali 9fffc38583 Documentation: fix typo in the --patch option of the commit command
Typofix (chose -> choose) in the documentation of the patch option
under the commit command.

Signed-off-by: Beshr Kayali <me@beshr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 13:08:25 -07:00
Johannes Schindelin 9b6e2c8b98 pager: avoid setting COLUMNS when we're guessing its value
We query `TIOCGWINSZ` in Git to determine the correct value for
`COLUMNS`, and then set that environment variable.

If `TIOCGWINSZ` is not available, we fall back to the hard-coded value
80 _and still_ set the environment variable.

On Windows this is a problem. The reason is that Git for
Windows uses a version of `less` that relies on the MSYS2 runtime to
interact with the pseudo terminal (typically inside a MinTTY window,
which is also aware of the MSYS2 runtime). Both MinTTY and `less.exe`
interact with that pseudo terminal via `ioctl()` calls (which the MSYS2
runtime emulates even if there is no such thing on Windows).
Since https://github.com/gwsw/less/commit/bb0ee4e76c2, `less` prefers
the `COLUMNS` variable over asking ncurses itself.

But `git.exe` itself is _not_ aware of the MSYS2 runtime, or for that
matter of that pseudo terminal, and has no way to call `ioctl()` or
`TIOCGWINSZ`.

Therefore, `git.exe` will fall back to hard-coding 80 columns, no matter
what the actual terminal size is.

But `less.exe` is totally able to interact with the MSYS2 runtime and
would not actually require Git's help (which actually makes things
worse here). So let's not override `COLUMNS` on Windows.

Let's just not set `COLUMNS` unless we managed to query the actual value
from the terminal.

This fixes https://github.com/git-for-windows/git/issues/3235

Co-authored-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 10:42:10 -07:00
Andrei Rybak 98c7656a18 git-worktree.txt: fix typo in example path
Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 10:05:15 -07:00
Andrei Rybak 6fc5369263 t: fix typos in test messages
Both in t4258 and in t9001, the code of the tests following shows the
proper name for the configuration variables.  So use the correct names
in the test messages as well.

Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 10:05:14 -07:00
Andrei Rybak 3fca954172 blame: correct name of config option in docs
As can be seen in files "Documentation/blame-options.txt" and
"builtin/blame.c", the name of this configuration option is
"blame.markUnblamableLines".

Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 10:05:13 -07:00
Jonathan Tan ef830cc434 promisor-remote: teach lazy-fetch in any repo
This is one step towards supporting partial clone submodules.

Even after this patch, we will still lack partial clone submodules
support, primarily because a lot of Git code that accesses submodule
objects does so by adding their object stores as alternates, meaning
that any lazy fetches that would occur in the submodule would be done
based on the config of the superproject, not of the submodule. This also
prevents testing of the functionality in this patch by user-facing
commands. So for now, test this mechanism using a test helper.

Besides that, there is some code that uses the wrapper functions
like has_promisor_remote(). Those will need to be checked to see if they
could support the non-wrapper functions instead (and thus support any
repository, not just the_repository).

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:58:01 -07:00
Jonathan Tan d1fa94356d run-command: refactor subprocess env preparation
submodule.c has functionality that prepares the environment for running
a subprocess in a new repo. The lazy-fetching code (used in partial
clones) will need this in a subsequent commit, so move it to a more
central location.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:58:01 -07:00
Jonathan Tan 69bb2e1804 submodule: refrain from filtering GIT_CONFIG_COUNT
14111fc492 ("git: submodule honor -c credential.* from command line",
2016-03-01) taught Git to pass through the GIT_CONFIG_PARAMETERS
environment variable when invoking a subprocess on behalf of a
submodule. But when d8d77153ea ("config: allow specifying config entries
via envvar pairs", 2021-01-15) introduced support for GIT_CONFIG_COUNT
(and its associated GIT_CONFIG_KEY_? and GIT_CONFIG_VALUE_?), the
subprocess mechanism wasn't updated to also pass through these
variables.

Since they are conceptually the same (d8d77153ea was written to address
a shortcoming of GIT_CONFIG_PARAMETERS), update the submodule subprocess
mechanism to also pass through GIT_CONFIG_COUNT.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:57:54 -07:00
Jonathan Tan ef7dc2e9cc promisor-remote: support per-repository config
Instead of using global variables to store promisor remote information,
store this config in struct repository instead, and add
repository-agnostic non-static functions corresponding to the existing
non-static functions that only work on the_repository.

The actual lazy-fetching of missing objects currently does not work on
repositories other than the_repository, and will still not work after
this commit, so add a BUG message explaining this. A subsequent commit
will remove this limitation.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:57:42 -07:00
Jonathan Tan ebaf3bcf1a repository: move global r_f_p_c to repo struct
Move repository_format_partial_clone, which is currently a global
variable, into struct repository. (Full support for per-repository
partial clone config will be done in a subsequent commit - this is split
into its own commit because of the extent of the changes needed.)

The new repo-specific variable cannot be set in
check_repository_format_gently() (as is currently), because that
function does not know which repo it is operating on (or even whether
the value is important); therefore this responsibility is delegated to
the outermost caller that knows. Of all the outermost callers that know
(found by looking at all functions that call clear_repository_format()),
I looked at those that either read from the main Git directory or write
into a struct repository. These callers have been modified accordingly
(write to the_repository in the former case and write to the given
struct repository in the latter case).

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:57:41 -07:00
dorgon.chang 54662d5958 git-p4: fix failed submit by skip non-text data files
If the submit contain binary files, it will throw exception and stop submit when try to append diff line description.

This commit will skip non-text data files when exception UnicodeDecodeError thrown.

The skip will not affect actual submit files in the resulting cl,
the diff line description will only appear in submit template,
so you can review what changed before actully submit to p4.

I don't know if add any message here will be helpful for users,
so I choose to just skip binary content, since it already append filename previously.

Signed-off-by: dorgon.chang <dorgonman@hotmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:49:30 -07:00
Ævar Arnfjörð Bjarmason d65aea37d9 show-branch tests: add missing tests
Add missing tests for --remotes, --list and --merge-base. These are
not exhaustive, but better than the nothing we have now.

There were some tests for this command added in f76412ed6d ([PATCH]
Add 'git show-branch'., 2005-08-21) has never been properly tested,
namely for the --all option in t6432-merge-recursive-space-options.sh,
and some of --merge-base and --independent in t6010-merge-base.sh.

This fixes a few more blind spots, but there's still a lot of behavior
that's not tested for.

These new tests show the odd (and possibly unintentional) behavior of
--merge-base with one argument, and how its output is the same as "git
merge-base" with N bases in this particular case. See the test added
in f621a8454d (git-merge-base/git-show-branch --merge-base:
Documentation and test, 2009-08-05) for a case where the two aren't
the same.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:33:06 -07:00
Ævar Arnfjörð Bjarmason 4465690cd8 show-branch: don't <COLOR></RESET> for space characters
Change the colored output introduced in ab07ba2a24 (show-branch: color
the commit status signs, 2009-04-22) to not color and reset each
individual space character we use for padding. The intent is to color
just the "!", "+" etc. characters.

This makes the output easier to test, so let's do that now. The test
would be much more verbose without a color/reset for each space
character. Since the coloring cycles through colors we previously had
a "rainbow of space characters".

In theory this breaks things for anyone who's relying on the exact
colored output of show-branch, in practice I'd think anyone parsing it
isn't actively turning on the colored output.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:33:06 -07:00
Ævar Arnfjörð Bjarmason 2f61b3eef3 mktag tests: test fast-export
Pass the bad tags we've created in the mktag tests through
fast-export, it will die on the bad object or ref, let's make sure
that happens.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:30:41 -07:00
Ævar Arnfjörð Bjarmason b48015b340 mktag tests: test for-each-ref
Add a "for-each-ref" for all the mktag tests. This test would have
caught the segfault which was fixed in c685450880 (ref-filter: fix
NULL check for parse object failure, 2021-04-01). Let's make sure we
test that code more exhaustively.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:30:41 -07:00
Ævar Arnfjörð Bjarmason eddc1f556c mktag tests: test update-ref and reachable fsck
Extend the mktag tests to pass the created bad tag through update-ref
and fsck.

The reason for passing it through update-ref is to guard against it
having a segfault as for-each-ref did before c685450880 (ref-filter:
fix NULL check for parse object failure, 2021-04-01).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:30:41 -07:00
Ævar Arnfjörð Bjarmason 47c0cb1a5d mktag tests: test hash-object --literally and unreachable fsck
Extend the mktag tests to pass the tag we've created through both
hash-object --literally and fsck.

This checks that fsck itself will not complain about certain invalid
content if a reachable tip isn't involved. Due to how fsck works and
walks the graph the failure will be different if the object is
reachable, so we might succeed before we've created the ref.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 09:30:41 -07:00
Elijah Newren 2bff554b23 merge-ort: add prefetching for content merges
Commit 7fbbcb21b1 ("diff: batch fetching of missing blobs", 2019-04-05)
introduced batching of fetching missing blobs, so that the diff
machinery would have one fetch subprocess grab N blobs instead of N
processes each grabbing 1.

However, the diff machinery is not the only thing in a merge that needs
to work on blobs.  The 3-way content merges need them as well.  Rather
than download all the blobs 1 at a time, prefetch all the blobs needed
for regular content merges.

This does not cover all possible paths in merge-ort that might need to
download blobs.  Others include:
  - The blob_unchanged() calls to avoid modify/delete conflicts (when
    blob renormalization results in an "unchanged" file)
  - Preliminary content merges needed for rename/add and
    rename/rename(2to1) style conflicts.  (Both of these types of
    conflicts can result in nested conflict markers from the need to do
    two levels of content merging; the first happens before our new
    prefetch_for_content_merges() function.)

The first of these wouldn't be an extreme amount of work to support, and
even the second could be theoretically supported in batching, but all of
these cases seem unusual to me, and this is a minor performance
optimization anyway; in the worst case we only get some of the fetches
batched and have a few additional one-off fetches.  So for now, just
handle the regular 3-way content merges in our prefetching.

For the testcase from the previous commit, the number of downloaded
objects remains at 63, but this drops the number of fetches needed from
32 down to 20, a sizeable reduction.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 07:58:25 -07:00
Elijah Newren 1aedd03afb diffcore-rename: use a different prefetch for basename comparisons
merge-ort was designed to minimize the amount of data needed and used,
and several changes were made to diffcore-rename to take advantage of
extra metadata to enable this data minimization (particularly the
relevant_sources variable for skipping "irrelevant" renames).  This
effort obviously succeeded in drastically reducing computation times,
but should also theoretically allow partial clones to download much less
information.  Previously, though, the "prefetch" command used in
diffcore-rename had never been modified and downloaded many blobs that
were unnecessary for merge-ort.  This commit corrects that.

When doing basename comparisons, we want to fetch only the objects that
will be used for basename comparisons.  If after basename fetching this
leaves us with no more relevant sources (or no more destinations), then
we won't need to do the full inexact rename detection and can skip
downloading additional source and destination files.  Even if we have to
do that later full inexact rename detection, irrelevant sources are
culled after basename matching and before the full inexact rename
detection, so we can still avoid downloading the blobs for irrelevant
sources.  Rename prefetch() to inexact_prefetch(), and introduce a
new basename_prefetch() to take advantage of this.

If we modify the testcase from commit 557ac0350d ("merge-ort: begin
performance work; instrument with trace2_region_* calls", 2021-01-23)
to pass
    --sparse --filter=blob:none
to the clone command, and use the new trace2 "fetch_count" output from
a few commits ago to track both the number of fetch subcommands invoked
and the number of objects fetched across all those fetches, then for
the mega-renames testcase we observe the following:

BEFORE this commit, rebasing 35 patches:
    strategy     # of fetches    total # of objects fetched
    ---------    ------------    --------------------------
    recursive    62              11423
    ort          30              11391

AFTER this commit, rebasing the same 35 patches:
    ort          32                 63

This means that the new code only needs to download less than 2 blobs
per patch being rebased.  That is especially interesting given that the
repository at the start only had approximately half a dozen TOTAL blobs
downloaded to start with (because the default sparse-checkout of just
the toplevel directory was in use).

So, for this particular linux kernel testcase that involved ~26,000
renames on the upstream side (drivers/ -> pilots/) across which 35
patches were being rebased, this change reduces the number of blobs that
need to be downloaded by a factor of ~180.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 07:58:25 -07:00
Elijah Newren d331dd3b0c diffcore-rename: allow different missing_object_cb functions
estimate_similarity() was setting up a diff_populate_filespec_options
every time it was called, requiring the caller of estimate_similarity()
to pass in some data needed to set up this option.  Currently the needed
data consisted of a single variable (skip_unmodified), but we want to
also have the different estimate_similarity() callsites start using
different missing_object_cb functions as well.  Rather than also passing
that data in, just have the caller pass in the whole
diff_populate_filespec_options, and reduce the number of times we need to
set it up.

As a side note, this also drops the number of calls to
has_promisor_remote() dramatically.  If L is the number of basename
paths to compare, M is the number of inexact sources, and N is the
number of inexact destinations, then the number of calls to
has_promisor_remote() drops from L+M*N down to at most 2 -- one for each
of the sites that calls estimate_similarity().  has_promisor_remote() is
a very fast function so this almost certainly has no measurable
performance impact, but it seems cleaner to avoid calling that function
so many times.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 07:58:25 -07:00
Elijah Newren c75c423952 t6421: add tests checking for excessive object downloads during merge
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-28 07:58:25 -07:00
Felipe Contreras a7d18a1109 pull: trivial whitespace style fix
Two spaces unaligned to anything is not part of the coding-style. A
single tab is.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-19 16:36:17 +09:00
Felipe Contreras a751e0296f pull: trivial cleanup
There's no need to store ran_ff. Now it's obvious from the conditionals.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-19 16:36:17 +09:00
Felipe Contreras 340062243a pull: cleanup autostash check
Currently "git pull --rebase" takes a shortcut in the case a
fast-forward merge is possible; run_merge() is called with --ff-only.

However, "git merge" didn't have an --autostash option, so, when "git
pull --rebase --autostash" was called *and* the fast-forward merge
shortcut was taken, then the pull failed.

This was fixed in commit f15e7cf5cc (pull: ff --rebase --autostash
works in dirty repo, 2017-06-01) by simply skipping the fast-forward
merge shortcut.

Later on "git merge" learned the --autostash option [a03b55530a
(merge: teach --autostash option, 2020-04-07)], and so did "git pull"
[d9f15d37f1 (pull: pass --autostash to merge, 2020-04-07)].

Therefore it's not necessary to skip the fast-forward merge shortcut
anymore when called with --rebase --autostash.

Let's always take the fast-forward merge shortcut by essentially
reverting f15e7cf5cc.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-19 16:36:16 +09:00
Fabian Wermelinger cea232194d completion: bash: fix late declaration of __git_cmd_idx
A recent update to contrib/completion/git-completion.bash causes bash to fail
auto complete custom commands that are wrapped with __git_func_wrap. Declaring
__git_cmd_idx=0 inside __git_func_wrap resolves the issue.

Signed-off-by: Fabian Wermelinger <fabianw@mavt.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-19 15:30:35 +09:00
Jeff King 7c0afdf23c t: use portable wrapper for readlink(1)
Not all systems have a readlink program available for use by the shell.
This causes t3210 to fail on at least AIX. Let's provide a perl
one-liner to do the same thing, and use it there.

I also updated calls in t9802. Nobody reported failure there, but it's
the same issue. Presumably nobody actually tests with p4 on AIX in the
first place (if it is even available there).

I left the use of readlink in the "--valgrind" setup in test-lib.sh, as
valgrind isn't available on exotic platforms anyway (and I didn't want
to increase dependencies between test-lib.sh and test-lib-functions.sh).

There's one other curious case. Commit d2addc3b96 (t7800: readlink may
not be available, 2016-05-31) fixed a similar case. We can't use our
wrapper function there, though, as it's inside a sub-script triggered by
Git. It uses a slightly different technique ("ls" piped to "sed"). I
chose not to use that here as it gives confusing "ls -l" output if the
file is unexpectedly not a symlink (which is OK for its limited use, but
potentially confusing for general use within the test suite). The perl
version emits the empty string.

Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-19 15:26:05 +09:00
Jiang Xin 12d6991cf4 test: refactor to use "get_abbrev_oid" to get abbrev oid
Add new function "get_abbrev_oid" to get abbrev object ID.  This
function has a default value which helps to prepare a nonempty replace
pattern for sed command.  An empty replace pattern may cause sed fail
to allocate memory.

Refactor function "make_user_friendly_and_stable_output" to use
"get_abbrev_oid" to get abbrev object ID.

Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-17 14:12:24 +09:00
Jiang Xin 3c06a58339 test: refactor to use "test_commit" to create commits
Refactor function "create_commits_in" to use "test_commit" to create
commit.

Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-17 14:12:22 +09:00
Jiang Xin 2bafb3d702 test: compare raw output, not mangle tabs and spaces
Before comparing with the expect file, we used to call function
"make_user_friendly_and_stable_output" to filter out trailing spaces in
output.  Ævar recommends using pattern "s/Z$//" to prepare expect file,
and then compare it with raw output.

Since we have fixed the issue of occasionally missing the clear-to-eol
suffix when displaying sideband #2 messages, it is safe and stable to
test against raw output.

Suggested-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-17 14:12:21 +09:00
Jiang Xin 5210225f25 sideband: don't lose clear-to-eol at packet boundary
When "demultiplex_sideband()" sees a nonempty message ending with CR or
LF on the sideband #2, it adds "suffix" string to clear to the end of
the current line, which helps when relaying a progress display whose
records are terminated with CRs.  But if it sees a single LF, no
clear-to-end suffix should be appended, because this single LF is used
to end the progress display by moving to the next line, and the final
progress display above should be preserved.

However, the code forgot that depending on the length of the payload
line, such a CR may fall exactly at the packet boundary and the
number of bytes before the CR from the beginning of the packet could
be zero.  In such a case, the message that was terminated by the CR
were leftover in the "scratch" buffer in the previous call to the
function and we still need to clear to the end of the current line.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-17 14:11:36 +09:00
Jiang Xin eb87c6f559 t6020: fix incompatible parameter expansion
Ævar reported that the function `make_user_friendly_and_stable_output()`
failed on a i386 box (gcc45) in the gcc farm boxes with error:

    sed: couldn't re-allocate memory

It turns out that older versions of bash (4.3) or dash (0.5.7) cannot
evaluate expression like `${A%${A#???????}}` used to get the leading 7
characters of variable A.

Replace the incompatible parameter expansion so that t6020 works on
older version of bash or dash.

Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-17 14:09:43 +09:00
Julian Verdurmen c4e317814f userdiff: add support for C# record types
Records are added in C# 9

Code example :

    public record Person(string FirstName, string LastName);

For more information, see:
* https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9

Signed-off-by: Julian Verdurmen <julian.verdurmen@outlook.com>
Reviewed-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 17:06:20 +09:00
Elijah Newren 78cfdd0cf5 promisor-remote: output trace2 statistics for number of objects fetched
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 16:17:13 +09:00
Derrick Stolee 46a237f42f *: fix typos
These typos were found while searching the codebase for gendered
pronouns. In the case of t9300-fast-import.sh, remove a confusing
comment that is unnecessary to the understanding of the test.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 11:26:20 +09:00
Felipe Contreras 0e20b229ee comments: avoid using the gender of our users
We generally avoid specifying the gender of our users in order to be
more inclusive, but sometimes a few slip by due to habit.

Since by doing a little bit of rewording we can avoid this irrelevant
detail, let's do so.

Inspired-by: Derrick Stolee <dstolee@microsoft.com>
Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 11:25:11 +09:00
Felipe Contreras 69b3367f6c doc: avoid using the gender of other people
Using gendered pronouns for an anonymous person applies a gender where
none is known and further excludes readers who do not use gendered
pronouns. Avoid such examples in the documentation by using "they" or
passive voice to avoid the need for a pronoun.

Inspired-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 11:25:09 +09:00
Ævar Arnfjörð Bjarmason 9eb542f2ee gc tests: add a test for the "pre-auto-gc" hook
Add a missing test for the behavior of the pre-auto-gc hook added in
0b85d92661 (Documentation/hooks: add pre-auto-gc hook, 2008-04-02).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 10:25:12 +09:00
Ævar Arnfjörð Bjarmason aac578492d pre-commit hook tests: don't leave "actual" nonexisting on failure
Start by creating an "actual" file in a core.hooksPath test that has
the hook echoing to the "actual" file.

We later test_cmp that file to see what hooks were run. If we fail to
run our hook(s) we'll have an empty list of hooks for the test_cmp
instead of a nonexisting file. For the logic of this test that makes more sense.

See 867ad08a26 (hooks: allow customizing where the hook directory is,
2016-05-04) for the commit that added these tests.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-16 10:24:39 +09:00
Alex Henrie 9853830787 graph: improve grammar of "invalid color" error message
Without the "d", it sounds like a command, not an error, and is liable
to be translated incorrectly.

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-06-15 12:54:26 +09:00