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phab/src/applications/repository/daemon/commitdiscovery/mercurial/PhabricatorRepositoryMercurialCommitDiscoveryDaemon.php
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PhabricatorRepositoryMercurialCommitDiscoveryDaemon.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
final class PhabricatorRepositoryMercurialCommitDiscoveryDaemon
extends PhabricatorRepositoryCommitDiscoveryDaemon {
protected function discoverCommits() {
$repository = $this->getRepository();
$vcs = $repository->getVersionControlSystem();
if ($vcs != PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL) {
throw new Exception("Repository is not a Mercurial repository.");
}
$repository_phid = $repository->getPHID();
list($stdout) = $repository->execxLocalCommand('branches');
$branches = ArcanistMercurialParser::parseMercurialBranches($stdout);
$got_something = false;
foreach ($branches as $name => $branch) {
$commit = $branch['rev'];
$commit = $this->getFullHash($commit);
if ($this->isKnownCommit($commit)) {
continue;
} else {
$this->discoverCommit($commit);
$got_something = true;
}
}
return $got_something;
}
private function getFullHash($commit) {
// NOTE: Mercurial shortens hashes to 12 characters by default. This
// implies collisions with as few as a few million commits. The
// documentation sensibly advises "Do not use short-form IDs for
// long-lived representations". It then continues "You can use the
// --debug option to display the full changeset ID". What?! Yes, this
// is in fact the only way to turn on full hashes, and the hg source
// code is littered with "hexfn = ui.debugflag and hex or short" and
// similar. There is no more-selective flag or config option.
//
// Unfortunately, "hg --debug" turns on tons of other extra output,
// including full commit messages in "hg log" and "hg parents" (which
// ignore --style); this renders them unparseable. So we have to use
// "hg id" to convert short hashes into full hashes. See:
//
// <http://mercurial.selenic.com/wiki/ChangeSetID>
//
// Of course, this means that if there are collisions we will break here
// (the short commit identifier won't be unambiguous) but maybe Mercurial
// will have a --full-hashes flag or something by then and we can fix it
// properly. Until we run into that, this allows us to store data in the
// right format so when we eventually encounter this we won't have to
// reparse every Mercurial repository.
$repository = $this->getRepository();
list($stdout) = $repository->execxLocalCommand(
'id --debug -i --rev %s',
$commit);
return trim($stdout);
}
private function discoverCommit($commit) {
$discover = array();
$insert = array();
$repository = $this->getRepository();
$discover[] = $commit;
$insert[] = $commit;
$seen_parent = array();
// For all the new commits at the branch heads, walk backward until we find
// only commits we've aleady seen.
while (true) {
$target = array_pop($discover);
list($stdout) = $repository->execxLocalCommand(
'parents --style default --rev %s',
$target);
$parents = ArcanistMercurialParser::parseMercurialLog($stdout);
if ($parents) {
foreach ($parents as $parent) {
$parent_commit = $parent['rev'];
$parent_commit = $this->getFullHash($parent_commit);
if (isset($seen_parent[$parent_commit])) {
continue;
}
$seen_parent[$parent_commit] = true;
if (!$this->isKnownCommit($parent_commit)) {
$discover[] = $parent_commit;
$insert[] = $parent_commit;
}
}
}
if (empty($discover)) {
break;
}
$this->stillWorking();
}
while (true) {
$target = array_pop($insert);
list($stdout) = $repository->execxLocalCommand(
'log --rev %s --template %s',
$target,
'{date|rfc822date}');
$epoch = strtotime($stdout);
$this->recordCommit($target, $epoch);
if (empty($insert)) {
break;
}
}
}
}
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