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PhabricatorRepositorySvnCommitDiscoveryDaemon.php
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Fri, Aug 16, 10:48

PhabricatorRepositorySvnCommitDiscoveryDaemon.php
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<?php
/*
* Copyright 2011 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.
*/
class PhabricatorRepositorySvnCommitDiscoveryDaemon
extends PhabricatorRepositoryCommitDiscoveryDaemon {
protected function discoverCommits() {
$repository = $this->getRepository();
$vcs = $repository->getVersionControlSystem();
if ($vcs != PhabricatorRepositoryType::REPOSITORY_TYPE_SVN) {
throw new Exception("Repository is not a svn repository.");
}
$uri = $this->getBaseSVNLogURI();
list($xml) = execx(
'svn log --xml --non-interactive --quiet --limit 1 %s@HEAD',
$uri);
$results = $this->parseSVNLogXML($xml);
$commit = key($results);
$epoch = reset($results);
if ($this->isKnownCommit($commit)) {
return false;
}
$this->discoverCommit($commit, $epoch);
return true;
}
private function discoverCommit($commit, $epoch) {
$uri = $this->getBaseSVNLogURI();
$discover = array(
$commit => $epoch,
);
$upper_bound = $commit;
$limit = 1;
while ($upper_bound > 1 && !$this->isKnownCommit($upper_bound)) {
// Find all the unknown commits on this path. Note that we permit
// importing an SVN subdirectory rather than the entire repository, so
// commits may be nonsequential.
list($err, $xml, $stderr) = exec_manual(
'svn log --xml --non-interactive --quiet --limit %d %s@%d',
$limit,
$uri,
$upper_bound - 1);
if ($err) {
if (preg_match('/(path|File) not found/', $stderr)) {
// We've gone all the way back through history and this path was not
// affected by earlier commits.
break;
} else {
throw new Exception("svn log error #{$err}: {$stderr}");
}
}
$discover += $this->parseSVNLogXML($xml);
$upper_bound = min(array_keys($discover));
// Discover 2, 4, 8, ... 256 logs at a time. This allows us to initially
// import large repositories fairly quickly, while pulling only as much
// data as we need in the common case (when we've already imported the
// repository and are just grabbing one commit at a time).
$limit = min($limit * 2, 256);
}
// NOTE: We do writes only after discovering all the commits so that we're
// never left in a state where we've missed commits -- if the discovery
// script terminates it can always resume and restore the import to a good
// state. This is also why we sort the discovered commits so we can do
// writes forward from the smallest one.
ksort($discover);
foreach ($discover as $commit => $epoch) {
$this->recordCommit($commit, $epoch);
}
}
private function parseSVNLogXML($xml) {
$xml = phutil_utf8ize($xml);
$result = array();
$log = new SimpleXMLElement($xml);
foreach ($log->logentry as $entry) {
$commit = (int)$entry['revision'];
$epoch = (int)strtotime((string)$entry->date[0]);
$result[$commit] = $epoch;
}
return $result;
}
private function getBaseSVNLogURI() {
$repository = $this->getRepository();
$uri = $repository->getDetail('remote-uri');
$subpath = $repository->getDetail('svn-subpath');
return $uri.$subpath;
}
}

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