fix(Mailer): Fix sendmail binary fallback

Signed-off-by: Josh <josh.t.richards@gmail.com>

apps/settings/lib/Settings/Admin/Mail.php

@@ -6,6 +6,7 @@
 namespace OCA\Settings\Settings\Admin;
 
 use OCP\AppFramework\Http\TemplateResponse;
+use OCP\IBinaryFinder;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\Settings\IDelegatedSettings;
@@ -30,9 +31,11 @@ class Mail implements IDelegatedSettings {
 	 * @return TemplateResponse
 	 */
 	public function getForm() {
+		$finder = \OCP\Server::get(IBinaryFinder::class);
+
 		$parameters = [
 			// Mail
-			'sendmail_is_available' => (bool) \OC_Helper::findBinaryPath('sendmail'),
+			'sendmail_is_available' => $finder->findBinaryPath('sendmail') !== false,
 			'mail_domain' => $this->config->getSystemValue('mail_domain', ''),
 			'mail_from_address' => $this->config->getSystemValue('mail_from_address', ''),
 			'mail_smtpmode' => $this->config->getSystemValue('mail_smtpmode', ''),

apps/settings/tests/Settings/Admin/MailTest.php

@@ -7,17 +7,17 @@ namespace OCA\Settings\Tests\Settings\Admin;
 
 use OCA\Settings\Settings\Admin\Mail;
 use OCP\AppFramework\Http\TemplateResponse;
+use OCP\IBinaryFinder;
 use OCP\IConfig;
 use OCP\IL10N;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class MailTest extends TestCase {
-	/** @var Mail */
-	private $admin;
-	/** @var IConfig */
-	private $config;
-	/** @var IL10N */
-	private $l10n;
+
+	private Mail $admin;
+	private IConfig&MockObject $config;
+	private IL10N&MockObject $l10n;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -30,7 +30,22 @@ class MailTest extends TestCase {
 		);
 	}
 
-	public function testGetForm() {
+	public static function dataGetForm(): array {
+		return [
+			[true],
+			[false],
+		];
+	}
+
+	/** @dataProvider dataGetForm */
+	public function testGetForm(bool $sendmail) {
+		$finder = $this->createMock(IBinaryFinder::class);
+		$finder->expects(self::once())
+			->method('findBinaryPath')
+			->with('sendmail')
+			->willReturn($sendmail ? '/usr/bin/sendmail': false);
+		$this->overwriteService(IBinaryFinder::class, $finder);
+
 		$this->config
 			->expects($this->any())
 			->method('getSystemValue')
@@ -51,7 +66,7 @@ class MailTest extends TestCase {
 			'settings',
 			'settings/admin/additional-mail',
 			[
-				'sendmail_is_available' => (bool) \OC_Helper::findBinaryPath('sendmail'),
+				'sendmail_is_available' => $sendmail,
 				'mail_domain' => 'mx.nextcloud.com',
 				'mail_from_address' => 'no-reply@nextcloud.com',
 				'mail_smtpmode' => 'smtp',

lib/private/Mail/Mailer.php

@@ -334,8 +334,10 @@ class Mailer implements IMailer {
 				break;
 			default:
 				$sendmail = \OCP\Server::get(IBinaryFinder::class)->findBinaryPath('sendmail');
-				if ($sendmail === null) {
+				if ($sendmail === false) {
+					// fallback (though not sure what good it'll do)
 					$sendmail = '/usr/sbin/sendmail';
+					$this->logger->debug('sendmail binary search failed, using fallback ' . $sendmail, ['app' => 'core']);
 				}
 				$binaryPath = $sendmail;
 				break;
@@ -346,6 +348,7 @@ class Mailer implements IMailer {
 			default => ' -bs',
 		};
 
+		$this->logger->debug('Using sendmail binary: ' . $binaryPath, ['app' => 'core']);
 		return new SendmailTransport($binaryPath . $binaryParam, null, $this->logger);
 	}
 }

tests/lib/Mail/MailerTest.php

@@ -12,6 +12,7 @@ use OC\Mail\Mailer;
 use OC\Mail\Message;
 use OCP\Defaults;
 use OCP\EventDispatcher\IEventDispatcher;
+use OCP\IBinaryFinder;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IURLGenerator;
@@ -86,7 +87,7 @@ class MailerTest extends TestCase {
 				['mail_sendmailmode', 'smtp', $sendmailMode],
 			]);
 
-		$path = \OC_Helper::findBinaryPath('sendmail');
+		$path = \OCP\Server::get(IBinaryFinder::class)->findBinaryPath('sendmail');
 		if ($path === false) {
 			$path = '/usr/sbin/sendmail';
 		}