DiffusionMercurialCommitParentsQuery.php
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	<?php

	final class DiffusionMercurialCommitParentsQuery
	extends DiffusionCommitParentsQuery {

	protected function executeQuery() {
	$drequest = $this->getRequest();
	$repository = $drequest->getRepository();

	list($stdout) = $repository->execxLocalCommand(
	'log --debug --limit 1 --template={parents} --rev %s',
	$drequest->getStableCommitName());
	$stdout = PhabricatorRepository::filterMercurialDebugOutput($stdout);

	$hashes = preg_split('/\s+/', trim($stdout));
	foreach ($hashes as $key => $value) {
	// Mercurial parents look like "23:ad9f769d6f786fad9f76d9a" -- we want
	// to strip out the local rev part.
	list($local, $global) = explode(':', $value);
	$hashes[$key] = $global;

	// With --debug we get 40-character hashes but also get the "000000..."
	// hash for missing parents; ignore it.
	if (preg_match('/^0+$/', $global)) {
	unset($hashes[$key]);
	}
	}

	return self::loadCommitsByIdentifiers($hashes, $drequest);
	}
	}