improve timezone detection

src/ISystem.php

@@ -55,6 +55,13 @@ interface ISystem {
 	 */
 	public function getStdBufPath();
 
+	/**
+	 * Get the full path to the `date` binary of false if the binary is not available
+	 *
+	 * @return string|bool
+	 */
+	public function getDatePath();
+
 	/**
 	 * Whether or not the smbclient php extension is enabled
 	 *

src/System.php

@@ -45,6 +45,10 @@ class System implements ISystem {
 		return $this->getBinaryPath('stdbuf');
 	}
 
+	public function getDatePath() {
+		return $this->getBinaryPath('date');
+	}
+
 	public function libSmbclientAvailable() {
 		return function_exists('smbclient_state_new');
 	}

src/TimeZoneProvider.php

@@ -27,6 +27,7 @@ class TimeZoneProvider implements ITimeZoneProvider {
 
 	public function get($host) {
 		if (!isset($this->timeZones[$host])) {
+			$timeZone = null;
 			$net = $this->system->getNetPath();
 			// for local domain names we can assume same timezone
 			if ($net && $host && strpos($host, '.') !== false) {
@@ -36,13 +37,17 @@ class TimeZoneProvider implements ITimeZoneProvider {
 					escapeshellarg($host)
 				);
 				$timeZone = exec($command);
-				if (!$timeZone) {
+			}
+
+			if (!$timeZone) {
+				$date = $this->system->getDatePath();
+				if ($date) {
+					$timeZone = exec($date . " +%z");
+				} else {
 					$timeZone = date_default_timezone_get();
 				}
-				$this->timeZones[$host] = $timeZone;
-			} else { // fallback to server timezone
-				$this->timeZones[$host] = date_default_timezone_get();
 			}
+			$this->timeZones[$host] = $timeZone;
 		}
 		return $this->timeZones[$host];
 	}

tests/TimeZoneProviderTest.php

@@ -0,0 +1,79 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Icewind\SMB\Test;
+
+use Icewind\SMB\ISystem;
+use Icewind\SMB\TimeZoneProvider;
+
+class TimeZoneProviderTest extends TestCase {
+	/** @var ISystem|\PHPUnit_Framework_MockObject_MockObject */
+	private $system;
+	/** @var TimeZoneProvider */
+	private $provider;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->system = $this->createMock(ISystem::class);
+		$this->provider = new TimeZoneProvider($this->system);
+	}
+
+	private function getDummyCommand($output) {
+		return "echo '$output' || false";
+	}
+
+	public function testFQDN() {
+		$this->system->method('getNetPath')
+			->willReturn($this->getDummyCommand("+800"));
+		$this->system->method('getDatePath')
+			->willReturn($this->getDummyCommand("+700"));
+
+		$this->assertEquals('+800', $this->provider->get('foo.bar.com'));
+	}
+
+	public function testLocal() {
+		$this->system->method('getNetPath')
+			->willReturn($this->getDummyCommand("+800"));
+		$this->system->method('getDatePath')
+			->willReturn($this->getDummyCommand("+700"));
+
+		$this->assertEquals('+700', $this->provider->get('foobar'));
+	}
+
+	public function testFQDNNoNet() {
+		$this->system->method('getNetPath')
+			->willReturn(false);
+		$this->system->method('getDatePath')
+			->willReturn($this->getDummyCommand("+700"));
+
+		$this->assertEquals('+700', $this->provider->get('foo.bar.com'));
+	}
+
+	public function testNoNetNoDate() {
+		$this->system->method('getNetPath')
+			->willReturn(false);
+		$this->system->method('getDatePath')
+			->willReturn(false);
+
+		$this->assertEquals(date_default_timezone_get(), $this->provider->get('foo.bar.com'));
+	}
+}