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Detect LFS by looking for tracks in ".gitattributes" instead of using "ls-tree"

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Summary:
See PHI1718. See also <https://discourse.phabricator-community.org/t/arc-diff-fails-due-to-git-cmd-fails/3680/>.

Currently, `arc diff` detects Git LFS with `git ls-files -z -- ':(attr:filter=lfs)'` magic. This is an accurate test, but does not work on older Git.

Try a simpler, dumber test and see if that will work. If this also has issues, we can try this stuff:

  - do version detection;
  - pipe the whole tree to `git check-attr`;
  - try a command like `git lfs ls-files` instead, which is probably a wrapper on one of these other commands.

Test Plan:
  - In a non-LFS repository, ran "arc diff" and saw the repository detect as non-LFS.
  - In an LFS repository, ran "arc diff" and saw the repository detect as LFS.

Differential Revision: https://secure.phabricator.com/D21190
This commit is contained in:
epriestley 2020-04-29 16:13:04 -07:00
parent 6ec09b2f48
commit ade9b51a1f
2 changed files with 29 additions and 2 deletions
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28
src/repository/api/ArcanistGitAPI.php
View file

@ -1678,4 +1678,32 @@ final class ArcanistGitAPI extends ArcanistRepositoryAPI {
return 'HEAD';
}
public function isGitLFSWorkingCopy() {
// NOTE: This test previously used the command:
//
// $ git ls-files -z -- ':(attr:filter=lfs)'
//
// However, this does not work on old versions of Git (see PHI1718) and
// it potentially does a lot of unnecessary work when run in a large tree.
//
// Instead, just check if ".gitattributes" exists and looks like it sets
// up an "lfs" filter for any pattern. This isn't completely accurate:
//
// - LFS can be configured with a global ".gitattributes" file, although
// this is unusual and discouraged by the official LFS documentation.
// - LFS may be configured only for files that don't actually exist in
// the repository.
//
// These cases are presumably very rare.
$attributes_path = $this->getPath('.gitattributes');
if (!Filesystem::pathExists($attributes_path)) {
return false;
}
$attributes_data = Filesystem::readFile($attributes_path);
return (bool)preg_match('(\bfilter\s*=\s*lfs\b)', $attributes_data);
}
}

3
src/workflow/ArcanistDiffWorkflow.php
View file

@ -2900,8 +2900,7 @@ EOTEXT
'uri' => $staging_uri,
);
list($stdout) = $api->execxLocal('ls-files -z -- %s', ':(attr:filter=lfs)');
$is_lfs = strpos($stdout, "\0") !== false;
$is_lfs = $api->isGitLFSWorkingCopy();
// If the base commit is a real commit, we're going to push it. We don't
// use this, but pushing it to a ref reduces the amount of redundant work