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AlmanacKeys.php
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			<?php

			final class AlmanacKeys extends Phobject {

			public static function getKeyPath($key_name) {
			$root = dirname(phutil_get_library_root('phabricator'));
			$keys = $root.'/conf/keys/';

			return $keys.ltrim($key_name, '/');
			}

			public static function getDeviceID() {
			// While running unit tests, ignore any configured device identity.
			try {
			PhabricatorTestCase::assertExecutingUnitTests();
			return null;
			} catch (Exception $ex) {
			// Continue normally.
			}

			$device_id_path = self::getKeyPath('device.id');

			if (Filesystem::pathExists($device_id_path)) {
			return trim(Filesystem::readFile($device_id_path));
			}

			return null;
			}

			public static function getLiveDevice() {
			$device_id = self::getDeviceID();
			if (!$device_id) {
			return null;
			}

			$cache = PhabricatorCaches::getRequestCache();
			$cache_key = 'almanac.device.self';

			$device = $cache->getKey($cache_key);
			if (!$device) {
			$viewer = PhabricatorUser::getOmnipotentUser();
			$device = id(new AlmanacDeviceQuery())
			->setViewer($viewer)
			->withNames(array($device_id))
			->executeOne();
			if (!$device) {
			throw new Exception(
			pht(
			'This host has device ID "%s", but there is no corresponding '.
			'device record in Almanac.',
			$device_id));
			}
			$cache->setKey($cache_key, $device);
			}

			return $device;
			}

			public static function getClusterSSHUser() {
			$username = PhabricatorEnv::getEnvConfig('diffusion.ssh-user');
			if (strlen($username)) {
			return $username;
			}

			return null;
			}

			}