feat: make search path for BinaryFinder customizable.

This feature is important for nextcloud running on
distributions like NixOS, where all the standard
search paths do not exist.

This fixes issue nextcloud#43922

Signed-off-by: Reno Reckling <e-github@wthack.de>

config/config.sample.php

@@ -1962,7 +1962,7 @@
 /**
  * Blacklist characters from being used in filenames. This is useful if you
  * have a filesystem or OS which does not support certain characters like windows.
- * 
+ *
  * The '/' and '\' characters are always forbidden.
  *
  * Example for windows systems: ``array('?', '<', '>', ':', '*', '|', '"', chr(0), "\n", "\r")``
@@ -2431,4 +2431,20 @@
  * Defaults to ``true``
  */
 'enable_non-accessible_features' => true,
+
+/**
+ * Directories where nextcloud looks for binaries.
+ * This is used to find external binaries like libreoffice, sendmail, ffmpeg and more.
+ *
+ * Defaults to ``['/usr/local/sbin','/usr/local/bin','/usr/sbin','/usr/bin','/sbin','/bin','/opt/bin']``
+ */
+'binary_search_paths' => [
+	'/usr/local/sbin',
+	'/usr/local/bin',
+	'/usr/sbin',
+	'/usr/bin',
+	'/sbin',
+	'/bin',
+	'/opt/bin',
+],
 ];

lib/private/BinaryFinder.php

@@ -3,6 +3,7 @@
 declare(strict_types = 1);
 /**
  * @copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ * @copyright 2024 Reno Reckling <e-github@wthack.de>
  * @license GNU AGPL version 3 or any later version
  *
  * This program is free software: you can redistribute it and/or modify
@@ -25,15 +26,28 @@
 use OCP\IBinaryFinder;
 use OCP\ICache;
 use OCP\ICacheFactory;
+use OCP\IConfig;
 use Symfony\Component\Process\ExecutableFinder;
 
 /**
  * Service that find the binary path for a program
  */
 class BinaryFinder implements IBinaryFinder {
+	const DEFAULT_BINARY_SEARCH_PATHS = [
+		'/usr/local/sbin',
+		'/usr/local/bin',
+		'/usr/sbin',
+		'/usr/bin',
+		'/sbin',
+		'/bin',
+		'/opt/bin',
+	];
 	private ICache $cache;
 
-	public function __construct(ICacheFactory $cacheFactory) {
+	public function __construct(
+		ICacheFactory   $cacheFactory,
+		private IConfig $config
+	) {
 		$this->cache = $cacheFactory->createLocal('findBinaryPath');
 	}
 
@@ -51,15 +65,10 @@ public function findBinaryPath(string $program) {
 		if (\OCP\Util::isFunctionEnabled('exec')) {
 			$exeSniffer = new ExecutableFinder();
 			// Returns null if nothing is found
-			$result = $exeSniffer->find($program, null, [
-				'/usr/local/sbin',
-				'/usr/local/bin',
-				'/usr/sbin',
-				'/usr/bin',
-				'/sbin',
-				'/bin',
-				'/opt/bin',
-			]);
+			$result = $exeSniffer->find(
+				$program,
+				null,
+				$this->config->getSystemValue('binary_search_paths', self::DEFAULT_BINARY_SEARCH_PATHS));
 			if ($result === null) {
 				$result = false;
 			}