in src/repository/api/ArcanistGitAPI.php [209:396]
protected function buildBaseCommit($symbolic_commit) {
if ($symbolic_commit !== null) {
if ($symbolic_commit == self::GIT_MAGIC_ROOT_COMMIT) {
$this->setBaseCommitExplanation(
pht('you explicitly specified the empty tree.'));
return $symbolic_commit;
}
list($err, $merge_base) = $this->execManualLocal(
'merge-base %s %s',
$symbolic_commit,
$this->getHeadCommit());
if ($err) {
throw new ArcanistUsageException(
pht(
"Unable to find any git commit named '%s' in this repository.",
$symbolic_commit));
}
if ($this->symbolicHeadCommit === null) {
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of the explicitly specified base commit ".
"'%s' and HEAD.",
$symbolic_commit));
} else {
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of the explicitly specified base commit ".
"'%s' and the explicitly specified head commit '%s'.",
$symbolic_commit,
$this->symbolicHeadCommit));
}
return trim($merge_base);
}
// Detect zero-commit or one-commit repositories. There is only one
// relative-commit value that makes any sense in these repositories: the
// empty tree.
list($err) = $this->execManualLocal('rev-parse --verify HEAD^');
if ($err) {
list($err) = $this->execManualLocal('rev-parse --verify HEAD');
if ($err) {
$this->repositoryHasNoCommits = true;
}
if ($this->repositoryHasNoCommits) {
$this->setBaseCommitExplanation(pht('the repository has no commits.'));
} else {
$this->setBaseCommitExplanation(
pht('the repository has only one commit.'));
}
return self::GIT_MAGIC_ROOT_COMMIT;
}
if ($this->getBaseCommitArgumentRules() ||
$this->getConfigurationManager()->getConfigFromAnySource('base')) {
$base = $this->resolveBaseCommit();
if (!$base) {
throw new ArcanistUsageException(
pht(
"None of the rules in your 'base' configuration matched a valid ".
"commit. Adjust rules or specify which commit you want to use ".
"explicitly."));
}
return $base;
}
$do_write = false;
$default_relative = null;
$working_copy = $this->getWorkingCopyIdentity();
if ($working_copy) {
$default_relative = $working_copy->getProjectConfig(
'git.default-relative-commit');
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of '%s' and HEAD, as specified in '%s' in ".
"'%s'. This setting overrides other settings.",
$default_relative,
'git.default-relative-commit',
'.arcconfig'));
}
// UBER CODE
if ($this->readScratchFile('uses-arc-flow') === 'true') {
$default_relative = null;
}
// UBER CODE END
if (!$default_relative) {
list($err, $upstream) = $this->execManualLocal(
'rev-parse --abbrev-ref --symbolic-full-name %s',
'@{upstream}');
if (!$err) {
$default_relative = trim($upstream);
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of '%s' (the Git upstream ".
"of the current branch) HEAD.",
$default_relative));
}
}
if (!$default_relative) {
$default_relative = $this->readScratchFile('default-relative-commit');
$default_relative = trim($default_relative);
if ($default_relative) {
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of '%s' and HEAD, as specified in '%s'.",
$default_relative,
'.git/arc/default-relative-commit'));
}
}
if (!$default_relative) {
// TODO: Remove the history lesson soon.
echo phutil_console_format(
"<bg:green>** %s **</bg>\n\n",
pht('Select a Default Commit Range'));
echo phutil_console_wrap(
pht(
"You're running a command which operates on a range of revisions ".
"(usually, from some revision to HEAD) but have not specified the ".
"revision that should determine the start of the range.\n\n".
"Previously, arc assumed you meant '%s' when you did not specify ".
"a start revision, but this behavior does not make much sense in ".
"most workflows outside of Facebook's historic %s workflow.\n\n".
"arc no longer assumes '%s'. You must specify a relative commit ".
"explicitly when you invoke a command (e.g., `%s`, not just `%s`) ".
"or select a default for this working copy.\n\nIn most cases, the ".
"best default is '%s'. You can also select '%s' to preserve the ".
"old behavior, or some other remote or branch. But you almost ".
"certainly want to select 'origin/master'.\n\n".
"(Technically: the merge-base of the selected revision and HEAD is ".
"used to determine the start of the commit range.)",
'HEAD^',
'git-svn',
'HEAD^',
'arc diff HEAD^',
'arc diff',
'origin/master',
'HEAD^'));
$prompt = pht('What default do you want to use? [origin/master]');
$default = phutil_console_prompt($prompt);
if (!strlen(trim($default))) {
$default = 'origin/master';
}
$default_relative = $default;
$do_write = true;
}
list($object_type) = $this->execxLocal(
'cat-file -t %s',
$default_relative);
if (trim($object_type) !== 'commit') {
throw new Exception(
pht(
"Relative commit '%s' is not the name of a commit!",
$default_relative));
}
if ($do_write) {
// Don't perform this write until we've verified that the object is a
// valid commit name.
$this->writeScratchFile('default-relative-commit', $default_relative);
$this->setBaseCommitExplanation(
pht(
"it is the merge-base of '%s' and HEAD, as you just specified.",
$default_relative));
}
list($merge_base) = $this->execxLocal(
'merge-base %s HEAD',
$default_relative);
return trim($merge_base);
}