DrydockCommandInterface.php
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	<?php

	abstract class DrydockCommandInterface extends DrydockInterface {

	private $workingDirectory;

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

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

	final public function getInterfaceType() {
	return 'command';
	}

	final public function exec($command) {
	$argv = func_get_args();
	$exec = call_user_func_array(
	array($this, 'getExecFuture'),
	$argv);
	return $exec->resolve();
	}

	final public function execx($command) {
	$argv = func_get_args();
	$exec = call_user_func_array(
	array($this, 'getExecFuture'),
	$argv);
	return $exec->resolvex();
	}

	abstract public function getExecFuture($command);

	protected function applyWorkingDirectoryToArgv(array $argv) {
	if ($this->getWorkingDirectory() !== null) {
	$cmd = $argv[0];
	$cmd = "(cd %s; {$cmd})";
	$argv = array_merge(
	array($cmd),
	array($this->getWorkingDirectory()),
	array_slice($argv, 1));
	}

	return $argv;
	}

	}