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	diff --git a/src/workflow/ArcanistUpgradeWorkflow.php b/src/workflow/ArcanistUpgradeWorkflow.php
	index d2ced0e1..a981557e 100644
	--- a/src/workflow/ArcanistUpgradeWorkflow.php
	+++ b/src/workflow/ArcanistUpgradeWorkflow.php
	@@ -1,93 +1,98 @@
	<?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.
	*/

	/**
	* Upgrade arcanist itself.
	*
	* @group workflow
	*/
	final class ArcanistUpgradeWorkflow extends ArcanistBaseWorkflow {

	public function getCommandSynopses() {
	return phutil_console_format(<<<EOTEXT
	upgrade
	EOTEXT
	);
	}

	public function getCommandHelp() {
	return phutil_console_format(<<<EOTEXT
	Supports: cli
	Upgrade arcanist and libphutil to the latest versions.
	EOTEXT
	);
	}

	public function getArguments() {
	return array();
	}

	public function run() {
	$roots = array();
	$roots['libphutil'] = dirname(phutil_get_library_root('phutil'));
	$roots['arcanist'] = dirname(phutil_get_library_root('arcanist'));

	foreach ($roots as $lib => $root) {
	echo "Upgrading {$lib}...\n";

	if (!Filesystem::pathExists($root.'/.git')) {
	throw new ArcanistUsageException(
	"{$lib} must be in its git working copy to be automatically ".
	"upgraded. This copy of {$lib} (in '{$root}') is not in a git ".
	"working copy.");
	}

	$working_copy = ArcanistWorkingCopyIdentity::newFromPath($root);

	$repository_api = ArcanistRepositoryAPI::newAPIFromWorkingCopyIdentity(
	$working_copy);
	+
	+ // Force the range to HEAD^..HEAD, which is meaningless but keeps us
	+ // from triggering "base" rules or other commit range resolution rules
	+ // that might prompt the user when we pull the working copy status.
	+ $repository_api->setRelativeCommit('HEAD^');
	$this->setRepositoryAPI($repository_api);

	// Require no local changes.
	$this->requireCleanWorkingCopy();

	// Require the library be on master.
	$branch_name = $repository_api->getBranchName();
	if ($branch_name != 'master') {
	throw new ArcanistUsageException(
	"{$lib} must be on branch 'master' to be automatically upgraded. ".
	"This copy of {$lib} (in '{$root}') is on branch '{$branch_name}'.");
	}

	chdir($root);
	try {
	phutil_passthru('git pull --rebase');
	} catch (Exception $ex) {
	phutil_passthru('git rebase --abort');
	throw $ex;
	}
	}

	echo phutil_console_wrap(
	phutil_console_format(
	"Updated! Your copy of arc is now up to date.\n"));

	return 0;
	}

	}

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