DifferentialGetWorkingCopy.php
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	<?php

	/**
	* Can't find a good place for this, so I'm putting it in the most notably
	* wrong place.
	*/
	final class DifferentialGetWorkingCopy {

	/**
	* Creates and/or cleans a workspace for the requested repo.
	*
	* return ArcanistGitAPI
	*/
	public static function getCleanGitWorkspace(
	PhabricatorRepository $repo) {

	$origin_path = $repo->getLocalPath();

	$path = rtrim($origin_path, '/');
	$path = $path.'__workspace';

	if (!Filesystem::pathExists($path)) {
	$repo->execxLocalCommand(
	'clone -- file://%s %s',
	$origin_path,
	$path);

	if (!$repo->isHosted()) {
	id(new ArcanistGitAPI($path))->execxLocal(
	'remote set-url origin %s',
	$repo->getRemoteURI());
	}
	}

	$workspace = new ArcanistGitAPI($path);
	$workspace->execxLocal('clean -f -d');
	$workspace->execxLocal('checkout master');
	$workspace->execxLocal('fetch');
	$workspace->execxLocal('reset --hard origin/master');
	$workspace->reloadWorkingCopy();

	return $workspace;
	}

	/**
	* Creates and/or cleans a workspace for the requested repo.
	*
	* return ArcanistMercurialAPI
	*/
	public static function getCleanMercurialWorkspace(
	PhabricatorRepository $repo) {

	$origin_path = $repo->getLocalPath();

	$path = rtrim($origin_path, '/');
	$path = $path.'__workspace';

	if (!Filesystem::pathExists($path)) {
	$repo->execxLocalCommand(
	'clone -- file://%s %s',
	$origin_path,
	$path);
	}

	$workspace = new ArcanistMercurialAPI($path);
	$workspace->execxLocal('pull');
	$workspace->execxLocal('update --clean default');
	$workspace->reloadWorkingCopy();

	return $workspace;
	}

	}