Summary: Ref T13434. Move some git-engine-specific handling of "arc land" arguments into the Git engine. This prepares to handle Perforce workflows.
Test Plan: Will "arc land" this change.
Maniphest Tasks: T13434
Differential Revision: https://secure.phabricator.com/D20867
Summary:
Ref T13428. Historically, "implode()" accepts arguments in either order. PHP 7.4+ warns about glue not being first.
Add a lint check when the second parameter is a static scalar, implying it is the glue parameter.
Test Plan: Ran unit tests. See next change.
Maniphest Tasks: T13428
Differential Revision: https://secure.phabricator.com/D20857
Summary:
Fixes T10321. Some reasonable but less-common workflows involve running `arc land` from a detached HEAD state.
When users do this, we currently try to delete the raw hash as though it were a branch during cleanup. Instead, detect if the thing we're thinking about deleting is a branch or not, and just leave it alone if it isn't.
Test Plan:
- Ran `git checkout <some hash>`, then `arc land --revision <some revision>`.
- Before, everything worked but cleanup tried to `git branch -D <some hash>`.
- After, everything worked and cleanup skipped branch deletion.
Maniphest Tasks: T10321
Differential Revision: https://secure.phabricator.com/D20786
Summary:
The current code assumes git-svn is always working from a remote called
`trunk`, but if the repository is initialized without the `-T` option it
will instead be called `git-svn`, and if `--prefix` is used (which is
set by default to `origin/` in Git 2+) the remote name will have the
specified prefix as well.
Instead, look at the `fetch` target refspec set in the git-svn config.
Fixes T13293.
Test Plan:
`arc land` without errors (or manually creating a `trunk` branch) from a
checkout made with Git 2.18.0 (verified this manually on a non-`-T`
checkout as well).
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T13293
Differential Revision: https://secure.phabricator.com/D19681
Summary:
Fixes T6854. The current format for `lint-test` files is somewhat inflexible and does not allow us to make assertions regarding the code or name of the linter messages (of class `ArcanistLintMessage`) that are raised. Specifically, the `${severity}:${line}:${char}` format is hardcoded in `ArcanistLinterTestCase`. In this diff, I extend the this format to achieve the following goals:
- Allow for the lint message code and name to be specified. Specifically, the full format is `${severity}:${line}:${char}:${code}:${name}`.
- Make all fields optional. `error:3:` will match any and all errors occuring on line 3.
- Provide more useful output when assertions fail. Specifically, output //all// lint messages that are missing and/or surplus. Previously, only the first lint message was output.
Test Plan: `arc unit`
Reviewers: #blessed_reviewers, epriestley, chad
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6854
Differential Revision: https://secure.phabricator.com/D11176
Summary:
I am writing a proxy linter that can be used to wrap any `ArcanistExternalLinter` and execute all commands within a Docker container (see [[https://github.com/freelancer/flarc/blob/master/src/lint/linter/ArcanistDockerContainerLinterProxy.php |`ArcanistDockerContainerLinterProxy`]] from [[https://github.com/freelancer/flarc | `flarc`]]). In order for `ArcanistDockerContainerLinterProxy` to behave like the `ArcanistExternalLinter` that is being proxied, `final` needs to be removed from some methods.
I figured this was reasonable to submit upstream as a similar change ({D19630}) was previously accepted.
Test Plan: N/A
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D19730
Summary:
I am writing a proxy linter that can be used to wrap any `ArcanistExternalLinter` and execute all commands within a Docker container (see [[https://github.com/freelancer/flarc/blob/master/src/lint/linter/ArcanistDockerContainerLinterProxy.php |`ArcanistDockerContainerLinterProxy`]] from [[https://github.com/freelancer/flarc | `flarc`]]). In order for `ArcanistDockerContainerLinterProxy` to behave like the `ArcanistExternalLinter` that is being proxied, `final` needs to be removed from some methods.
I figured this was reasonable to submit upstream as a similar change ({D19630}) was previously accepted.
Test Plan: N/A
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D20514
Summary: The recently-added, build-plan-behavior-aware check here does all of its own prompting, so we should skip the other prompting if it doesn't throw.
Test Plan: Will `arc land` something sketchy sooner or later.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D20494
Summary:
See PHI1238. This "," in the regex can only make the lint binding fail if there is no "," in the version output string. In modern versions of Pylint, there is (apparently) no comma in the version string. Remove it.
See also <https://discourse.phabricator-community.org/t/arcanistpylintlinter-version-regex-issue/2688>
Test Plan:
```
$ pip install pylint
Traceback (most recent call last):
File "/Users/epriestley/Library/Python/2.7/bin/pip", line 6, in <module>
from pip._internal import main
ImportError: No module named pip._internal
```
¯\_(ツ)_/¯
Reviewers: amckinley, joshuaspence
Reviewed By: joshuaspence
Differential Revision: https://secure.phabricator.com/D20505
Summary:
Since I'm in here for PHI1083:
- Add some "--" so we get correct behavior when you have a file named "master", a branch named "README.txt", etc.
- Stop using "%C" unnecessarily.
- Fix some untranslatable strings.
Test Plan: Ran `arc patch` a couple of times, ran the variations of `git` commands to catch anything weird with "--" handling.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D20254
Summary:
See PHI1083. Previously, see PHI648 and D19475.
When you apply a submodule patch in Git, it leaves you with a working copy that has the "submodule pointer" dirtied but the actual submodule untouched:
```
$ git status
On branch ...
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
modified: philter
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
modified: philter (new commits)
```
So, if you're applying `D123` and `submodule/` was previously pointed at commit "A" but `D123` updates it to point at commit "B", you get this after `git apply ...`:
- Git index says "submodule/ = B".
- On disk, "submodule/ = A".
Now, if you `git add --all` or `git commit --all`, git picks up the "change" on disk as an intended modification of the submodule. This puts the submodule back to "A" and overwrites/undoes the "pointer" update that's trying to make it point to "B".
To avoid this, update submodules after applying the patch.
Also, every time we modify the working copy, just update submodules.
Test Plan:
- Add a submodule in branch "B1", pointed at commit "A".
- Branch to create branch "B2". Update the submodule to point at commit "B". Commit this and `arc diff` it.
- Go back to "B1". Use `arc patch D...` to apply the revision you just created.
- Before change:
- "arc patch" applies the submodule change, so "pointer = B", "disk = A".
- "arc patch" runs "git commit --all", which looks at disk and sets "pointer = A".
- This isn't a change, so we fail with an empty commit.
- After change:
- "arc patch" applies the submodule change, so "pointer = B", "disk = A".
- "arc patch" updates submodules, so "pointer = B", "disk = B".
- "arc patch" runs "git commit --all", which now has a change, and commits "submodule = B".
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D20253
Summary:
Ref T13258. This makes "arc land" respect the new "Warn When Landing" behavior.
This will only work if you have very up-to-date APIs. Just fall back to the older code if the new API calls fail.
Test Plan: Ran `arc land` on a revision with builds in various states and with the different "Warn When Landing" behaviors. Saw appropriate warnings.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13258
Differential Revision: https://secure.phabricator.com/D20236
Summary:
See PHI1104. The older "differential.querydiffs" method includes the entire raw diff text for all the diffs associated with a revision in its response, but we: only care about the most recent diff; and don't care about the text at all.
For reasonably large changes with several updates, this can be significantly slow.
We can get this same information more efficiently from the modern "differential.diff.search", since D19386 (April 2018). The only trick is that we need a "revisionPHID", which we don't have on hand.
For now, just fetch the revision PHID. In the future, we can likely make adjustments so that we have the revision PHID already by the time we get here.
This may slow down the normal case very slightly (since we now do two calls instead of one), but it speeds up the bad cases dramatically.
Test Plan:
Ran `arc diff` to update a change in a local repository. `var_dump()`'d the old and new algorithm results, saw the same outcome.
Used `arc diff --trace` on an update to a change to verify that `differential.diff.search` is called but `differential.querydiffs` is not.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D20221
Summary:
Ref T13161. See D20181. This allows the intraline highlighter to accept new ">" and "<" spans and apply a different style for them.
The input pattern is `list<segment>`. Each segment is `pair<wild kind, int byte_length>`, i.e. wrap the next `byte_length` bytes in a span of kind `kind`.
Before this change, the possible kinds of segements are `0` (no intraline diff, do not highlight) or `1` (intraline diff, highlight in bright color).
D20181 adds `<` (depth decreased) and `>` (depth increased). These are like `1`, but add a different class so the UI can handle them differently.
Test Plan: See D20181.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13161
Differential Revision: https://secure.phabricator.com/D20182
Summary:
Ref T13249. See PHI810. We currently warn you when //all// reviewers are away, but not when only some reviewers are away.
This makes some amount of sense under the "anyone can accept anything" rules we sort of recommend, but a lot of installs realistically have tons of owner/package rules now.
Instead, if any reviewers are away, show the user exactly who is away and until when, then make sure they don't want to make any adjustments.
(We can do a better job of this after the toolsets change when we can use the new APIs, but this is an easy fix for now.)
Test Plan: Created a revision with multiple reviewers, either some or all of whom were away. Got appropriate output and prompt behavior.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13249
Differential Revision: https://secure.phabricator.com/D20172
Summary: Ref T13249. We currently allow `if (function_exists('X')) { X(); }` but not `if (defined('X')) { X; }`. Allow the latter.
Test Plan: See D20145, which linted clean with this patch in place.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13249
Differential Revision: https://secure.phabricator.com/D20146
Summary: See 30 prior patches. This is a fatal in PHP7, let's just hunt these down.
Test Plan: Ran unit tests. See next diff for results.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D19931
Summary:
See PHI904. Ref T13210. Ref T13209. Currently, we have an `hg cat` construction which attempts to pass a literal `%p` to Mercurial. This fails because you can't pass `%` through `%s` outside of `wilds`.
It also uses `%C` to pass a list of file paths. This is broadly unsafe and can cause command execution if you modify a file named, e.g., `; rm -rf xyz` or similar. I think it would be difficult to turn this into an attack but it's fairly bad. This dates from D5144 in 2013.
Test Plan: With this patch, created D19757 which has valid binary data (see F5962134).
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13210, T13209
Differential Revision: https://secure.phabricator.com/D19758
Summary:
Ref T13098. See PHI858. If you write this at the end of a message in `arc diff`:
```
Subscribers:
#projectname
# NEW DIFFERENTIAL REVISION
# Describe the changes in this new revision.
# ...
```
...we'll currently eat the `#projectname` as an instructional comment, even if it is followed by an empty line.
Instead, stop eating stuff once we hit the first empty line. (We escape empty lines in comments already.)
After T13098 I'll maybe adjust this to use a more explicit instruction escape, like `##`, since there's no reason we're bound to `#`.
Test Plan: Added a unit test and made it pass.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13098
Differential Revision: https://secure.phabricator.com/D19639
Summary: I'm not sure if the upstream will be interested in this change, but we are writing a linter which works by running an external command on the entire repository. This can't be done with `ArcanistExternalLinter` at the moment, which meant that we ended up copy-pasting most of `ArcanistFutureLinter`. This would be a lot easier if we could override `willLintPaths` and `didLintPaths`, but these methods are currently marked as `final`. An alternative solution would be some sort of `ArcanistLinter::transformPath` method.
Test Plan: N/A
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: faulconbridge, Korvin
Differential Revision: https://secure.phabricator.com/D19630
Summary:
Ref T13187. See PHI838. If two hunks are separated by 7 lines of context, we can render them as either:
```lang=diff
+ Hunk A
Context 1
Context 2
Context 3
Context 4
Context 5
Context 6
Context 7
+ Hunk B
```
...or:
```lang=diff
+ Hunk A
Context 1
Context 2
Context 3
@@ +1,2 -3,4 @@
Context 5
Context 6
Context 7
+ Hunk B
```
Since we get the same number of output lines either way and the first one is more human-readable, we picked that one.
However, `diff -u` does the second one. Since human-readability is probably less important than compatibility, change the behavior to be more similar to `diff -u`.
Test Plan: Added unit tests for the edge cases with default parameters (6 context lines, 7 context lines) and made them pass.
Reviewers: amckinley
Maniphest Tasks: T13187
Differential Revision: https://secure.phabricator.com/D19603
Summary:
See https://discourse.phabricator-community.org/t/arc-not-supporting-git-2-17-1/.
When treating it a large file binary, we try to get the "old" and "new" content using `git ls-tree` and `cat-file`.
If the file is new or deleted, there is no old file, so we try to work with filename `null`.
Under git < 2.17.1, that gets treated as `git ls-tree -- .`, which falls in the next condition under "no such path".
In git 2.18, etc, this is an error.
Explicitly bail out if there is no filename.
Test Plan: Add a new, large (>4Mb) file, arc diff.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D19513
Summary: See PHI718. Modern Mercurial with the "evolve" extension enabled may emit this field.
Test Plan: As D19262.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D19498
Summary:
Ref T13151. See PHI648. With `arc patch --nobranch`, we update submodules a little too early.
I //believe// it is safe to just update them a little later, after the intermediate branch management logic runs.
Test Plan: Ran `arc patch --nobranch`, saw submodule update run later. Not 100% sure this doesn't cause weird issues, but I can't anticipate any.
Reviewers: amckinley, jmeador
Reviewed By: jmeador
Maniphest Tasks: T13151
Differential Revision: https://secure.phabricator.com/D19475
Summary:
The Configuration Manager is supported by ArcanistUnitTestEngine but not support by the ArcanistConfigurationDrivenUnitTestEngine.
Added the configuration manager as one of the initially set properties of an ArcUnitTestEngine created by the ArcanistConfigurationDrivenTestEngine
Test Plan: Ran arc unit against a project without the change, verified the Configuration was none. Added this change and ran again and verified it was set
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D19465
Summary:
Ref T13137. See PHI592. When you have a diff with 600MB of videos, we want to bail out of diff generation early (as soon as we realize what we're dealing with), not build an 800MB text diff in memory and then throw it away.
Support bailout //during// diff generation once we realize we're in over our heads.
This is approximate, but since the limit is fairly large (512KB by default) it isn't too important to be precise.
Test Plan: Rigged some callers to set various byte limits, generated diffs including diffs with large binaries. Got an appropriate diff or exeception depending on how low the limit was.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13137
Differential Revision: https://secure.phabricator.com/D19444
Summary: Fixes T1246. See PHI637. See T13137. Computers have gotten a bit faster so we can probably bump this up a little and see if it causes problems. This is `O(N^2)` so the this should be less than twice as expensive in the worst case.
Test Plan:
Created a diff affecting characters on a very long line separated by more than 80 but fewer than 100 characters, got a good intraline diff out of it:
{F5605162}
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T1246
Differential Revision: https://secure.phabricator.com/D19442
Summary:
Ref T13130. I wasn't able make this much better, but it looks like this is about ~20% faster on my system.
This kind of thing is somewhat difficult to micro-optimize because XHProf tends to over-estimate the cost of function calls. In XHProf, this looks much much faster than the old version (~100% faster) but the actual cost of `bin/conduit call --method differential.getrawdiff` hasn't improved that much. Still, it seems consistently faster across multiple runs.
Test Plan:
- Pulled binary diffs over Conduit with `bin/conduit call --method differential.getrawdiff`.
- Verified that they are byte-for-byte identical with the pre-change diffs, and look like they're ~20% faster.
- Profiled the differences and saw a far more dramatic improvement, but I believe XHProf is exaggerating the effect of this change because it tends to overestimate function call cost.
- Ran unit tests (from D19407), got byte-for-byte identical output under both 32bit and 64bit mode.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13130
Differential Revision: https://secure.phabricator.com/D19408
Summary:
Ref T13130. I want to take a crack at improving performance here, but two possible approaches (inlining the actual encoding; using integers if they're big enough) aren't easy to test right now.
Restructure the tests so they can support these kinds of refactoring.
The "32bit" and "64bit" modes currently do the same thing, but I expect to introduce introduce separate encoding pathways in a future change, if the profiler says it actually helps.
(I'll hold this and everything that comes after it until I make meaningful performance improvements.)
Test Plan: Ran `arc unit`, got passes on tests.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13130
Differential Revision: https://secure.phabricator.com/D19407
Summary:
Filenames are last in `git status --porcelain=2` lines; they
are not escaped in any way, despite the fields being
whitespace-delimited. `explode` thus happily chops apart filenames
with spaces in them, causing later git operations to operate only on
the filename up to the first space.
Split the lines into the right number of elements -- in all cases,
this is one more than the index we're using, since filenames come last.
Test Plan:
Altering a file with a space in its path, and running `arc diff -a`.
Added tests.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D19389
Summary: Ref T13110. We now degrade very large changes and I'm not convinced any user ever entered "n" at this prompt.
Test Plan: Ran `arc diff` to create this very revision.
Maniphest Tasks: T13110
Differential Revision: https://secure.phabricator.com/D19299
Summary: See PHI527. Ref T13116. The `--revision` flag currently fails if the argument is in the form `D123` instead of `123`. Normalize monogram arguments.
Test Plan: Ran `arc patch --revision Dxxx`, `arc patch --revision xxx`, `arc patch --revision xxx --diff yyy`, `arc patch`; got good behavior on the good ones and sensible error messages on the other ones.
Maniphest Tasks: T13116
Differential Revision: https://secure.phabricator.com/D19292
Summary:
STDERR output with `%`s in it could cause:
```
ERROR 2: fprintf(): Too few arguments at [/usr/local/arcanist/src/workflow/ArcanistFeatureWorkflow.php:170]
```
Test Plan: Untested.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D19261
Summary:
In Go 1.10 the output for tests was changed to have also a "(cached)" mode in
addition to the normal timing info printed. This is on by default. This adds
support for parsing these lines instead of erroring out on the regex.
Test Plan: Have a unit test included, and will continue to poke at it locally.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D19161
Summary: Fixes T8236. I played around with a lot of variations of this but in the end it felt like the simple version was best.
Test Plan: Ran `arc weld a.txt b.txt`, observed very robust fusion of materials.
Maniphest Tasks: T8236
Differential Revision: https://secure.phabricator.com/D19081
Summary:
Fixes T13061. Both `arc lint` and `arc unit` accept an `--everything` flag, but the documentation isn't quite clear about what these flags do.
They act as though every //tracked// file in the repository (`git ls-files`, `hg manifest`, or `svn list -R`) is included in the argument list.
They do not lint/test ignored files (and I think almost all users would be very surprised if they did).
They also don't lint/test untracked files (files you have not yet used `git add`, `svn add`, or `hg add` on). This is slightly more contentious but we have good reasons for doing it (e.g., `git ls-files` often outperforms `find .` by a large margin) and I believe users very rarely use `--everything` in a situation where they have untracked files. The only real exception I can come up with is linter configuration/development, as in PHI343, and it seems okay to have a slightly surprising behvaior here.
Make the documentation more clear about what is in scope.
We could also rename these to `--nearly-everything` or whatever, but I think the name is probably clear enough given current information about how confusing this is (specifically: only rarely, in unusual cases).
Test Plan:
- Grepped for documentation about these flags.
- Ran `arc help lint`, `arc help unit`, `arc unit --everything x`, `arc lint --everything x` and read all the new messages.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13061
Differential Revision: https://secure.phabricator.com/D18989
Summary:
Fixes T8768. See PHI294. See that task for more details.
Git, Mercurial, `diff`, and `patch` have conspired to make things weird. To correctly handle files with spaces in the way everything else does and expects, we need to emit semantic trailing whitespace literals.
Test Plan:
- Created a file with spaces in it in a Mercurial repositroy, committed it, diffed it into a revision.
- Used `arc patch` to apply the change to a clean copy of the repository.
- Before patch: Mercurial incorrectly creates a file named `X`, not a file named `X Y.txt`.
- After patch: `arc patch` commit is identical to genuine commit.
- Also added test coverage. The other general behaviors here are fairly well covered already.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T8768
Differential Revision: https://secure.phabricator.com/D18869
Summary:
Currently, `arc` on `git` uses the following commands to examine the
state of the working tree and history; example times for a no-op diff in a
165k-file working tree are also shown:
```
1) git diff --no-ext-diff --no-textconv --submodule=short --raw 'fb062d4ecce5d9c1786b7bfc8a0dedf6b11fdd96' --
= 1,722,514 us
2a) git diff --no-ext-diff --no-textconv --submodule=short --raw 'HEAD' --
= 1,715,507 us
2b) git ls-files --others --exclude-standard
= 2,359,202 us
3) git diff-files --name-only
= 1,333,274 us
```
Steps (2a) and (2b) are run concurrently; this results in a total elapsed
wallclock time of approximately 5.4 seconds. This is inefficient -- all four of
the above steps must both load the index and examine the working copy, which may
be slow operations when large repositories are used. Additionally, none of the
effort of those stat calls on the working tree, or load time of the index, is
shared across the processes.
Step (1) is called from `getCommitRangeStatus`, which was split out in D4095; it
is currently never called on its own, only ever from `getWorkingCopyStatus`,
where it it combined with `getUncommittedStatus`. The current behavior of the
method is to return the set of changes //either// in local commits //or//
uncommitted in the working tree, which duplicates work that
`getUncommittedStatus` is intended to do. Changing the behavior of this method
(in Git, and other VCSes) to only examine _committed_ status seems both inline
with the name of the method and the original description of it in D4095 -- and
also serves to make it much faster, as it is an operation that need not inspect
the working tree at all.
Steps (2a), (2b), and (3) attempt to gather the state of the working copy, and
as such are all I/O bound but must examine nearly identical data. For git
2.11.0 and higher, we can instead rely on the machine-parseable `git status
--porcelain=2` format, which provides the information from all of these commands
at once. It also allows additional performance improvements, as `git status`
has been the focus of several optimizations in the latest versions of git (the
untracked cache and fsmonitor services, for instance), which are not available
in the lower-level `diff`, `ls-files`, and `diff-files` commands.
This has the added benefit of fixing a bug noticed in T9455, in that uncommitted
or unstaged changes in modules can now be detected, regardless of if they also
have changed their base commit. It further resolves a bug where `.gitmodules`
appeared to have unstaged changes, when in reality the unstaged changes were in
submodules elsewhere in the tree.
For backwards compatibility with versions of git < 2.11.0, the old code is left
in place. It is possible that the simpler output from v1 of `git status
--porcelain` would also suffice for some of the above benefits, but the payoff
of parsing yet another format is deemed insufficient; users wishing improved
performance should simply upgrade `git`.
Alltogether, these result in the following, for a no-op diff in a
165k-working-file tree:
```
1) git diff --no-ext-diff --no-textconv --submodule=short --raw 'fb062d4ecce5d9c1786b7bfc8a0dedf6b11fdd96' HEAD --
= 9,227 us
2) git status --porcelain=2 -z
= 739,964 us
```
...for a total of 749ms, an improvement of 4.7s.
Depends on D18841.
Test Plan: Existing tests.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D18842
Summary:
This adds tests that detail the current behavior of `arc` in
the presence of `git` submodules.
Test Plan: No behavior change; wrote the tests such that they pass.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D18841
