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PhabricatorFilesManagementEnginesWorkflow.php
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			<?php

			final class PhabricatorFilesManagementEnginesWorkflow
			extends PhabricatorFilesManagementWorkflow {

			protected function didConstruct() {
			$this
			->setName('engines')
			->setSynopsis(pht('List available storage engines.'))
			->setArguments(array());
			}

			public function execute(PhutilArgumentParser $args) {
			$console = PhutilConsole::getConsole();

			$engines = PhabricatorFile::buildAllEngines();
			if (!$engines) {
			throw new Exception(pht('No storage engines are available.'));
			}

			foreach ($engines as $engine) {
			$console->writeOut(
			"%s\n",
			$engine->getEngineIdentifier());
			}

			return 0;
			}

			}