ArcanistBaseWorkflow.php
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ArcanistBaseWorkflow.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.
	*/

	/**
	* Implements a runnable command, like "arc diff" or "arc help".
	*
	* = Managing Conduit =
	*
	* Workflows have the builtin ability to open a Conduit connection to a
	* Phabricator installation, so methods can be invoked over the API. Workflows
	* may either not need this (e.g., "help"), or may need a Conduit but not
	* authentication (e.g., calling only public APIs), or may need a Conduit and
	* authentication (e.g., "arc diff").
	*
	* To specify that you need an //unauthenticated// conduit, override
	* @{method:requiresConduit} to return ##true##. To specify that you need an
	* //authenticated// conduit, override @{method:requiresAuthentication} to
	* return ##true##. You can also manually invoke @{method:establishConduit}
	* and/or @{method:authenticateConduit} later in a workflow to upgrade it.
	* Once a conduit is open, you can access the client by calling
	* @{method:getConduit}, which allows you to invoke methods. You can get
	* verified information about the user identity by calling @{method:getUserPHID}
	* or @{method:getUserName} after authentication occurs.
	*
	* @task conduit Conduit
	* @group workflow
	*/
	class ArcanistBaseWorkflow {

	private $conduit;
	private $conduitURI;
	private $conduitCredentials;
	private $conduitAuthenticated;

	private $userPHID;
	private $userName;
	private $repositoryAPI;
	private $workingCopy;
	private $arguments;
	private $command;

	private $arcanistConfiguration;
	private $parentWorkflow;
	private $workingDirectory;

	private $changeCache = array();

	public function __construct() {

	}


	/* -( Conduit )------------------------------------------------------------ */


	/**
	* Set the URI which the workflow will open a conduit connection to when
	* @{method:establishConduit} is called. Arcanist makes an effort to set
	* this by default for all workflows (by reading ##.arcconfig## and/or the
	* value of ##--conduit-uri##) even if they don't need Conduit, so a workflow
	* can generally upgrade into a conduit workflow later by just calling
	* @{method:establishConduit}.
	*
	* You generally should not need to call this method unless you are
	* specifically overriding the default URI. It is normally sufficient to
	* just invoke @{method:establishConduit}.
	*
	* NOTE: You can not call this after a conduit has been established.
	*
	* @param string The URI to open a conduit to when @{method:establishConduit}
	* is called.
	* @return this
	* @task conduit
	*/
	final public function setConduitURI($conduit_uri) {
	if ($this->conduit) {
	throw new Exception(
	"You can not change the Conduit URI after a conduit is already open.");
	}
	$this->conduitURI = $conduit_uri;
	return $this;
	}


	/**
	* Open a conduit channel to the server which was previously configured by
	* calling @{method:setConduitURI}. Arcanist will do this automatically if
	* the workflow returns ##true## from @{method:requiresConduit}, or you can
	* later upgrade a workflow and build a conduit by invoking it manually.
	*
	* You must establish a conduit before you can make conduit calls.
	*
	* NOTE: You must call @{method:setConduitURI} before you can call this
	* method.
	*
	* @return this
	* @task conduit
	*/
	final public function establishConduit() {
	if ($this->conduit) {
	return $this;
	}

	if (!$this->conduitURI) {
	throw new Exception(
	"You must specify a Conduit URI with setConduitURI() before you can ".
	"establish a conduit.");
	}

	$this->conduit = new ConduitClient($this->conduitURI);

	return $this;
	}


	/**
	* Set credentials which will be used to authenticate against Conduit. These
	* credentials can then be used to establish an authenticated connection to
	* conduit by calling @{method:authenticateConduit}. Arcanist sets some
	* defaults for all workflows regardless of whether or not they return true
	* from @{method:requireAuthentication}, based on the ##~/.arcrc## and
	* ##.arcconf## files if they are present. Thus, you can generally upgrade a
	* workflow which does not require authentication into an authenticated
	* workflow by later invoking @{method:requireAuthentication}. You should not
	* normally need to call this method unless you are specifically overriding
	* the defaults.
	*
	* NOTE: You can not call this method after calling
	* @{method:authenticateConduit}.
	*
	* @param dict A credential dictionary, see @{method:authenticateConduit}.
	* @return this
	* @task conduit
	*/
	final public function setConduitCredentials(array $credentials) {
	if ($this->conduitAuthenticated) {
	throw new Exception(
	"You may not set new credentials after authenticating conduit.");
	}

	$this->conduitCredentials = $credentials;
	return $this;
	}


	/**
	* Open and authenticate a conduit connection to a Phabricator server using
	* provided credentials. Normally, Arcanist does this for you automatically
	* when you return true from @{method:requiresAuthentication}, but you can
	* also upgrade an existing workflow to one with an authenticated conduit
	* by invoking this method manually.
	*
	* You must authenticate the conduit before you can make authenticated conduit
	* calls (almost all calls require authentication).
	*
	* This method uses credentials provided via @{method:setConduitCredentials}
	* to authenticate to the server:
	*
	* - ##user## (required) The username to authenticate with.
	* - ##certificate## (required) The Conduit certificate to use.
	* - ##description## (optional) Description of the invoking command.
	*
	* Successful authentication allows you to call @{method:getUserPHID} and
	* @{method:getUserName}, as well as use the client you access with
	* @{method:getConduit} to make authenticated calls.
	*
	* NOTE: You must call @{method:setConduitURI} and
	* @{method:setConduitCredentials} before you invoke this method.
	*
	* @return this
	* @task conduit
	*/
	final public function authenticateConduit() {
	if ($this->conduitAuthenticated) {
	return $this;
	}

	$this->establishConduit();

	$credentials = $this->conduitCredentials;
	if (!$credentials) {
	throw new Exception(
	"Set conduit credentials with setConduitCredentials() before ".
	"authenticating conduit!");
	}

	if (empty($credentials['user']) \|\| empty($credentials['certificate'])) {
	throw new Exception(
	"Credentials must include a 'user' and a 'certificate'.");
	}

	$description = idx($credentials, 'description', '');
	$user = $credentials['user'];
	$certificate = $credentials['certificate'];

	try {
	$connection = $this->getConduit()->callMethodSynchronous(
	'conduit.connect',
	array(
	'client' => 'arc',
	'clientVersion' => 3,
	'clientDescription' => php_uname('n').':'.$description,
	'user' => $user,
	'certificate' => $certificate,
	'host' => $this->conduitURI,
	));
	} catch (ConduitClientException $ex) {
	if ($ex->getErrorCode() == 'ERR-NO-CERTIFICATE' \|\|
	$ex->getErrorCode() == 'ERR-INVALID-USER') {
	$conduit_uri = $this->conduitURI;
	$message =
	"\n".
	phutil_console_format(
	"YOU NEED TO __INSTALL A CERTIFICATE__ TO LOGIN TO PHABRICATOR").
	"\n\n".
	phutil_console_format(
	" To do this, run: arc install-certificate").
	"\n\n".
	"The server '{$conduit_uri}' rejected your request:".
	"\n".
	$ex->getMessage();
	throw new ArcanistUsageException($message);
	} else {
	throw $ex;
	}
	}

	$this->userName = $user;
	$this->userPHID = $connection['userPHID'];

	$this->conduitAuthenticated = true;

	return $this;
	}


	/**
	* Override this to return true if your workflow requires a conduit channel.
	* Arc will build the channel for you before your workflow executes. This
	* implies that you only need an unauthenticated channel; if you need
	* authentication, override @{method:requiresAuthentication}.
	*
	* @return bool True if arc should build a conduit channel before running
	* the workflow.
	* @task conduit
	*/
	public function requiresConduit() {
	return false;
	}


	/**
	* Override this to return true if your workflow requires an authenticated
	* conduit channel. This implies that it requires a conduit. Arc will build
	* and authenticate the channel for you before the workflow executes.
	*
	* @return bool True if arc should build an authenticated conduit channel
	* before running the workflow.
	* @task conduit
	*/
	public function requiresAuthentication() {
	return false;
	}


	/**
	* Returns the PHID for the user once they've authenticated via Conduit.
	*
	* @return phid Authenticated user PHID.
	* @task conduit
	*/
	final public function getUserPHID() {
	if (!$this->userPHID) {
	$workflow = get_class($this);
	throw new Exception(
	"This workflow ('{$workflow}') requires authentication, override ".
	"requiresAuthentication() to return true.");
	}
	return $this->userPHID;
	}

	/**
	* Deprecated. See @{method:getUserPHID}.
	*
	* @deprecated
	*/
	final public function getUserGUID() {
	phutil_deprecated(
	'ArcanistBaseWorkflow::getUserGUID',
	'This method has been renamed to getUserPHID().');
	return $this->getUserPHID();
	}

	/**
	* Return the username for the user once they've authenticated via Conduit.
	*
	* @return string Authenticated username.
	* @task conduit
	*/
	final public function getUserName() {
	return $this->userName;
	}


	/**
	* Get the established @{class@libphutil:ConduitClient} in order to make
	* Conduit method calls. Before the client is available it must be connected,
	* either implicitly by making @{method:requireConduit} or
	* @{method:requireAuthentication} return true, or explicitly by calling
	* @{method:establishConduit} or @{method:authenticateConduit}.
	*
	* @return @{class@libphutil:ConduitClient} Live conduit client.
	* @task conduit
	*/
	final public function getConduit() {
	if (!$this->conduit) {
	$workflow = get_class($this);
	throw new Exception(
	"This workflow ('{$workflow}') requires a Conduit, override ".
	"requiresConduit() to return true.");
	}
	return $this->conduit;
	}


	public function setArcanistConfiguration($arcanist_configuration) {
	$this->arcanistConfiguration = $arcanist_configuration;
	return $this;
	}

	public function getArcanistConfiguration() {
	return $this->arcanistConfiguration;
	}

	public function getCommandHelp() {
	return get_class($this).": Undocumented";
	}

	public function requiresWorkingCopy() {
	return false;
	}


	public function requiresRepositoryAPI() {
	return false;
	}

	public function setCommand($command) {
	$this->command = $command;
	return $this;
	}

	public function getCommand() {
	return $this->command;
	}

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

	public function setWorkingDirectory($working_directory) {
	$this->workingDirectory = $working_directory;
	return $this;
	}

	public function getWorkingDirectory() {
	return $this->workingDirectory;
	}

	private function setParentWorkflow($parent_workflow) {
	$this->parentWorkflow = $parent_workflow;
	return $this;
	}

	protected function getParentWorkflow() {
	return $this->parentWorkflow;
	}

	public function buildChildWorkflow($command, array $argv) {
	$arc_config = $this->getArcanistConfiguration();
	$workflow = $arc_config->buildWorkflow($command);
	$workflow->setParentWorkflow($this);
	$workflow->setCommand($command);

	if ($this->repositoryAPI) {
	$workflow->setRepositoryAPI($this->repositoryAPI);
	}

	if ($this->userPHID) {
	$workflow->userPHID = $this->getUserPHID();
	$workflow->userName = $this->getUserName();
	}

	if ($this->conduit) {
	$workflow->conduit = $this->conduit;
	}

	if ($this->workingCopy) {
	$workflow->setWorkingCopy($this->workingCopy);
	}

	$workflow->setArcanistConfiguration($arc_config);

	$workflow->parseArguments(array_values($argv));

	return $workflow;
	}

	public function getArgument($key, $default = null) {
	$args = $this->arguments;
	if (!array_key_exists($key, $args)) {
	return $default;
	}
	return $args[$key];
	}

	final public function getCompleteArgumentSpecification() {
	$spec = $this->getArguments();
	$arc_config = $this->getArcanistConfiguration();
	$command = $this->getCommand();
	$spec += $arc_config->getCustomArgumentsForCommand($command);
	return $spec;
	}

	public function parseArguments(array $args) {

	$spec = $this->getCompleteArgumentSpecification();

	$dict = array();

	$more_key = null;
	if (!empty($spec['*'])) {
	$more_key = $spec['*'];
	unset($spec['*']);
	$dict[$more_key] = array();
	}

	$short_to_long_map = array();
	foreach ($spec as $long => $options) {
	if (!empty($options['short'])) {
	$short_to_long_map[$options['short']] = $long;
	}
	}

	$more = array();
	for ($ii = 0; $ii < count($args); $ii++) {
	$arg = $args[$ii];
	$arg_name = null;
	$arg_key = null;
	if ($arg == '--') {
	$more = array_merge(
	$more,
	array_slice($args, $ii + 1));
	break;
	} else if (!strncmp($arg, '--', 2)) {
	$arg_key = substr($arg, 2);
	if (!array_key_exists($arg_key, $spec)) {
	throw new ArcanistUsageException(
	"Unknown argument '{$arg_key}'. Try 'arc help'.");
	}
	} else if (!strncmp($arg, '-', 1)) {
	$arg_key = substr($arg, 1);
	if (empty($short_to_long_map[$arg_key])) {
	throw new ArcanistUsageException(
	"Unknown argument '{$arg_key}'. Try 'arc help'.");
	}
	$arg_key = $short_to_long_map[$arg_key];
	} else {
	$more[] = $arg;
	continue;
	}

	$options = $spec[$arg_key];
	if (empty($options['param'])) {
	$dict[$arg_key] = true;
	} else {
	if ($ii == count($args) - 1) {
	throw new ArcanistUsageException(
	"Option '{$arg}' requires a parameter.");
	}
	$dict[$arg_key] = $args[$ii + 1];
	$ii++;
	}
	}

	if ($more) {
	if ($more_key) {
	$dict[$more_key] = $more;
	} else {
	$example = reset($more);
	throw new ArcanistUsageException(
	"Unrecognized argument '{$example}'. Try 'arc help'.");
	}
	}

	foreach ($dict as $key => $value) {
	if (empty($spec[$key]['conflicts'])) {
	continue;
	}
	foreach ($spec[$key]['conflicts'] as $conflict => $more) {
	if (isset($dict[$conflict])) {
	if ($more) {
	$more = ': '.$more;
	} else {
	$more = '.';
	}
	// TODO: We'll always display these as long-form, when the user might
	// have typed them as short form.
	throw new ArcanistUsageException(
	"Arguments '--{$key}' and '--{$conflict}' are mutually exclusive".
	$more);
	}
	}
	}

	$this->arguments = $dict;

	$this->didParseArguments();

	return $this;
	}

	protected function didParseArguments() {
	// Override this to customize workflow argument behavior.
	}

	public function getWorkingCopy() {
	if (!$this->workingCopy) {
	$workflow = get_class($this);
	throw new Exception(
	"This workflow ('{$workflow}') requires a working copy, override ".
	"requiresWorkingCopy() to return true.");
	}
	return $this->workingCopy;
	}

	public function setWorkingCopy(
	ArcanistWorkingCopyIdentity $working_copy) {
	$this->workingCopy = $working_copy;
	return $this;
	}

	public function setRepositoryAPI($api) {
	$this->repositoryAPI = $api;
	return $this;
	}

	public function getRepositoryAPI() {
	if (!$this->repositoryAPI) {
	$workflow = get_class($this);
	throw new Exception(
	"This workflow ('{$workflow}') requires a Repository API, override ".
	"requiresRepositoryAPI() to return true.");
	}
	return $this->repositoryAPI;
	}

	protected function shouldRequireCleanUntrackedFiles() {
	return empty($this->arguments['allow-untracked']);
	}

	public function requireCleanWorkingCopy() {
	$api = $this->getRepositoryAPI();

	$working_copy_desc = phutil_console_format(
	" Working copy: __%s__\n\n",
	$api->getPath());

	$untracked = $api->getUntrackedChanges();
	if ($this->shouldRequireCleanUntrackedFiles()) {
	if (!empty($untracked)) {
	echo "You have untracked files in this working copy.\n\n".
	$working_copy_desc.
	" Untracked files in working copy:\n".
	" ".implode("\n ", $untracked)."\n\n";

	if ($api instanceof ArcanistGitAPI) {
	echo phutil_console_wrap(
	"Since you don't have '.gitignore' rules for these files and have ".
	"not listed them in '.git/info/exclude', you may have forgotten ".
	"to 'git add' them to your commit.");
	} else if ($api instanceof ArcanistSubversionAPI) {
	echo phutil_console_wrap(
	"Since you don't have 'svn:ignore' rules for these files, you may ".
	"have forgotten to 'svn add' them.");
	} else if ($api instanceof ArcanistMercurialAPI) {
	echo phutil_console_wrap(
	"Since you don't have '.hgignore' rules for these files, you ".
	"may have forgotten to 'hg add' them to your commit.");
	}

	$prompt = "Do you want to continue without adding these files?";
	if (!phutil_console_confirm($prompt, $default_no = false)) {
	throw new ArcanistUserAbortException();
	}
	}
	}

	$incomplete = $api->getIncompleteChanges();
	if ($incomplete) {
	throw new ArcanistUsageException(
	"You have incompletely checked out directories in this working copy. ".
	"Fix them before proceeding.\n\n".
	$working_copy_desc.
	" Incomplete directories in working copy:\n".
	" ".implode("\n ", $incomplete)."\n\n".
	"You can fix these paths by running 'svn update' on them.");
	}

	$conflicts = $api->getMergeConflicts();
	if ($conflicts) {
	throw new ArcanistUsageException(
	"You have merge conflicts in this working copy. Resolve merge ".
	"conflicts before proceeding.\n\n".
	$working_copy_desc.
	" Conflicts in working copy:\n".
	" ".implode("\n ", $conflicts)."\n");
	}

	$unstaged = $api->getUnstagedChanges();
	if ($unstaged) {
	throw new ArcanistUsageException(
	"You have unstaged changes in this working copy. Stage and commit (or ".
	"revert) them before proceeding.\n\n".
	$working_copy_desc.
	" Unstaged changes in working copy:\n".
	" ".implode("\n ", $unstaged)."\n");
	}

	$uncommitted = $api->getUncommittedChanges();
	if ($uncommitted) {
	throw new ArcanistUsageException(
	"You have uncommitted changes in this branch. Commit (or revert) them ".
	"before proceeding.\n\n".
	$working_copy_desc.
	" Uncommitted changes in working copy\n".
	" ".implode("\n ", $uncommitted)."\n");
	}
	}

	protected function chooseRevision(
	array $revision_data,
	$revision_id,
	$prompt = null) {

	$revisions = array();
	foreach ($revision_data as $data) {
	$ref = ArcanistDifferentialRevisionRef::newFromDictionary($data);
	$revisions[$ref->getID()] = $ref;
	}

	if ($revision_id) {
	$revision_id = $this->normalizeRevisionID($revision_id);
	if (empty($revisions[$revision_id])) {
	throw new ArcanistChooseInvalidRevisionException();
	}
	return $revisions[$revision_id];
	}

	if (!count($revisions)) {
	throw new ArcanistChooseNoRevisionsException();
	}

	$repository_api = $this->getRepositoryAPI();

	$candidates = array();
	$cur_path = $repository_api->getPath();
	foreach ($revisions as $revision) {
	$source_path = $revision->getSourcePath();
	if ($source_path == $cur_path) {
	$candidates[] = $revision;
	}
	}

	if (count($candidates) == 1) {
	$candidate = reset($candidates);
	$revision_id = $candidate->getID();
	}

	if ($revision_id) {
	return $revisions[$revision_id];
	}

	$revision_indexes = array_keys($revisions);

	echo "\n";
	$ii = 1;
	foreach ($revisions as $revision) {
	echo ' ['.$ii++.'] D'.$revision->getID().' '.$revision->getName()."\n";
	}

	while (true) {
	$id = phutil_console_prompt($prompt);
	$id = trim(strtoupper($id), 'D');
	if (isset($revisions[$id])) {
	return $revisions[$id];
	}
	if (isset($revision_indexes[$id - 1])) {
	return $revisions[$revision_indexes[$id - 1]];
	}
	}
	}

	protected function loadDiffBundleFromConduit(
	ConduitClient $conduit,
	$diff_id) {

	return $this->loadBundleFromConduit(
	$conduit,
	array(
	'diff_id' => $diff_id,
	));
	}

	protected function loadRevisionBundleFromConduit(
	ConduitClient $conduit,
	$revision_id) {

	return $this->loadBundleFromConduit(
	$conduit,
	array(
	'revision_id' => $revision_id,
	));
	}

	private function loadBundleFromConduit(
	ConduitClient $conduit,
	$params) {

	$future = $conduit->callMethod('differential.getdiff', $params);
	$diff = $future->resolve();

	$changes = array();
	foreach ($diff['changes'] as $changedict) {
	$changes[] = ArcanistDiffChange::newFromDictionary($changedict);
	}
	$bundle = ArcanistBundle::newFromChanges($changes);
	$bundle->setConduit($conduit);
	$bundle->setProjectID($diff['projectName']);
	return $bundle;
	}

	/**
	* Return a list of lines changed by the current diff, or ##null## if the
	* change list is meaningless (for example, because the path is a directory
	* or binary file).
	*
	* @param string Path within the repository.
	* @param string Change selection mode (see ArcanistDiffHunk).
	* @return list\|null List of changed line numbers, or null to indicate that
	* the path is not a line-oriented text file.
	*/
	protected function getChangedLines($path, $mode) {
	$repository_api = $this->getRepositoryAPI();
	$full_path = $repository_api->getPath($path);
	if (is_dir($full_path)) {
	return null;
	}

	$change = $this->getChange($path);

	if ($change->getFileType() !== ArcanistDiffChangeType::FILE_TEXT) {
	return null;
	}

	$lines = $change->getChangedLines($mode);
	return array_keys($lines);
	}

	private function getChange($path) {
	$repository_api = $this->getRepositoryAPI();

	if ($repository_api instanceof ArcanistSubversionAPI) {
	// NOTE: In SVN, we don't currently support a "get all local changes"
	// operation, so special case it.
	if (empty($this->changeCache[$path])) {
	$diff = $repository_api->getRawDiffText($path);
	$parser = new ArcanistDiffParser();
	$changes = $parser->parseDiff($diff);
	if (count($changes) != 1) {
	throw new Exception("Expected exactly one change.");
	}
	$this->changeCache[$path] = reset($changes);
	}
	} else if ($repository_api->supportsRelativeLocalCommits()) {
	if (empty($this->changeCache)) {
	$changes = $repository_api->getAllLocalChanges();
	foreach ($changes as $change) {
	$this->changeCache[$change->getCurrentPath()] = $change;
	}
	}
	} else {
	throw new Exception("Missing VCS support.");
	}

	if (empty($this->changeCache[$path])) {
	if ($repository_api instanceof ArcanistGitAPI) {
	// This can legitimately occur under git if you make a change, "git
	// commit" it, and then revert the change in the working copy and run
	// "arc lint".
	$change = new ArcanistDiffChange();
	$change->setCurrentPath($path);
	return $change;
	} else {
	throw new Exception(
	"Trying to get change for unchanged path '{$path}'!");
	}
	}

	return $this->changeCache[$path];
	}

	final public function willRunWorkflow() {
	$spec = $this->getCompleteArgumentSpecification();
	foreach ($this->arguments as $arg => $value) {
	if (empty($spec[$arg])) {
	continue;
	}
	$options = $spec[$arg];
	if (!empty($options['supports'])) {
	$system_name = $this->getRepositoryAPI()->getSourceControlSystemName();
	if (!in_array($system_name, $options['supports'])) {
	$extended_info = null;
	if (!empty($options['nosupport'][$system_name])) {
	$extended_info = ' '.$options['nosupport'][$system_name];
	}
	throw new ArcanistUsageException(
	"Option '--{$arg}' is not supported under {$system_name}.".
	$extended_info);
	}
	}
	}
	}

	protected function normalizeRevisionID($revision_id) {
	return ltrim(strtoupper($revision_id), 'D');
	}

	protected function shouldShellComplete() {
	return true;
	}

	protected function getShellCompletions(array $argv) {
	return array();
	}

	protected function getSupportedRevisionControlSystems() {
	return array('any');
	}

	protected function getPassthruArgumentsAsMap($command) {
	$map = array();
	foreach ($this->getCompleteArgumentSpecification() as $key => $spec) {
	if (!empty($spec['passthru'][$command])) {
	if (isset($this->arguments[$key])) {
	$map[$key] = $this->arguments[$key];
	}
	}
	}
	return $map;
	}

	protected function getPassthruArgumentsAsArgv($command) {
	$spec = $this->getCompleteArgumentSpecification();
	$map = $this->getPassthruArgumentsAsMap($command);
	$argv = array();
	foreach ($map as $key => $value) {
	$argv[] = '--'.$key;
	if (!empty($spec[$key]['param'])) {
	$argv[] = $value;
	}
	}
	return $argv;
	}

	public static function getUserConfigurationFileLocation() {
	return getenv('HOME').'/.arcrc';
	}

	public static function readUserConfigurationFile() {
	$user_config = array();
	$user_config_path = self::getUserConfigurationFileLocation();
	if (Filesystem::pathExists($user_config_path)) {
	$mode = fileperms($user_config_path);
	if (!$mode) {
	throw new Exception("Unable to get perms of '{$user_config_path}'!");
	}
	if ($mode & 0177) {
	// Mode should allow only owner access.
	$prompt = "File permissions on your ~/.arcrc are too open. ".
	"Fix them by chmod'ing to 600?";
	if (!phutil_console_confirm($prompt, $default_no = false)) {
	throw new ArcanistUsageException("Set ~/.arcrc to file mode 600.");
	}
	execx('chmod 600 %s', $user_config_path);
	}

	$user_config_data = Filesystem::readFile($user_config_path);
	$user_config = json_decode($user_config_data, true);
	if (!is_array($user_config)) {
	throw new ArcanistUsageException(
	"Your '~/.arcrc' file is not a valid JSON file.");
	}
	}
	return $user_config;
	}

	/**
	* Write a message to stderr so that '--json' flags or stdout which is meant
	* to be piped somewhere aren't disrupted.
	*
	* @param string Message to write to stderr.
	* @return void
	*/
	protected function writeStatusMessage($msg) {
	file_put_contents('php://stderr', $msg);
	}

	protected function isHistoryImmutable() {
	$working_copy = $this->getWorkingCopy();
	return ($working_copy->getConfig('immutable_history') === true);
	}

	}

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