ArcanistUpgradeWorkflow.php
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	<?php

	final class ArcanistUpgradeWorkflow
	extends ArcanistArcWorkflow {

	public function getWorkflowName() {
	return 'upgrade';
	}

	public function getWorkflowInformation() {
	$help = pht(<<<EOTEXT
	Upgrade Arcanist to the latest version.
	EOTEXT
	);

	return $this->newWorkflowInformation()
	->setSynopsis(pht('Upgrade Arcanist to the latest version.'))
	->addExample(pht('upgrade'))
	->setHelp($help);
	}

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

	public function runWorkflow() {
	$log = $this->getLogEngine();

	$roots = array(
	'arcanist' => dirname(phutil_get_library_root('arcanist')),
	);

	$supported_branches = array(
	'master',
	'stable',
	);
	$supported_branches = array_fuse($supported_branches);

	foreach ($roots as $library => $root) {
	$log->writeStatus(
	pht('PREPARING'),
	pht(
	'Preparing to upgrade "%s"...',
	$library));

	$working_copy = ArcanistWorkingCopy::newFromWorkingDirectory($root);

	$repository_api = $working_copy->getRepositoryAPI();
	$is_git = ($repository_api instanceof ArcanistGitAPI);

	if (!$is_git) {
	throw new PhutilArgumentUsageException(
	pht(
	'The "arc upgrade" workflow uses "git pull" to upgrade '.
	'Arcanist, but the "arcanist/" directory (in "%s") is not a Git '.
	'working copy. You must leave "arcanist/" as a Git '.
	'working copy to use "arc upgrade".',
	$root));
	}

	// NOTE: Don't use requireCleanWorkingCopy() here because it tries to
	// amend changes and generally move the workflow forward. We just want to
	// abort if there are local changes and make the user sort things out.
	$uncommitted = $repository_api->getUncommittedStatus();
	if ($uncommitted) {
	$message = pht(
	'You have uncommitted changes in the working copy ("%s") for this '.
	'library ("%s"):',
	$root,
	$library);

	$list = id(new PhutilConsoleList())
	->setWrap(false)
	->addItems(array_keys($uncommitted));

	id(new PhutilConsoleBlock())
	->addParagraph($message)
	->addList($list)
	->addParagraph(
	pht(
	'Discard these changes before running "arc upgrade".'))
	->draw();

	throw new PhutilArgumentUsageException(
	pht('"arc upgrade" can only upgrade clean working copies.'));
	}

	$branch_name = $repository_api->getBranchName();
	if (!isset($supported_branches[$branch_name])) {
	throw new PhutilArgumentUsageException(
	pht(
	'Library "%s" (in "%s") is on branch "%s", but this branch is '.
	'not supported for automatic upgrades. Supported branches are: '.
	'%s.',
	$library,
	$root,
	$branch_name,
	implode(', ', array_keys($supported_branches))));
	}

	$log->writeStatus(
	pht('UPGRADING'),
	pht(
	'Upgrading "%s" (on branch "%s").',
	$library,
	$branch_name));

	$command = csprintf(
	'git pull --rebase origin -- %R',
	$branch_name);

	$future = (new PhutilExecPassthru($command))
	->setCWD($root);

	try {
	$this->newCommand($future)
	->execute();
	} catch (Exception $ex) {
	// If we failed, try to go back to the old state, then throw the
	// original exception.
	exec_manual('git rebase --abort');
	throw $ex;
	}
	}

	$log->writeSuccess(
	pht('UPGRADED'),
	pht('Your copy of Arcanist is now up to date.'));

	return 0;
	}

	}

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