split cache_path and uploads_path

Signed-off-by: Lorenzo Tanganelli <lorenzo.tanganelli@hotmail.it>

config/config.sample.php

@@ -1897,6 +1897,13 @@
  */
 'updatedirectory' => '',
 
+/**
+ * Override where Nextcloud stores uploaded user files while uploading (chunks). Useful in situations
+ * where the default `<user_id>/uploads` is on network disk like NFS.
+ * Defaults to the value of '' if unset.
+ */
+'uploads_path' => '',
+
 /**
  * Blacklist a specific file or files and disallow the upload of files
  * with this name. ``.htaccess`` is blocked by default.

lib/private/Files/Mount/CacheMountProvider.php

@@ -53,19 +53,25 @@ public function __construct(IConfig $config) {
 	 */
 	public function getMountsForUser(IUser $user, IStorageFactory $loader) {
 		$cacheBaseDir = $this->config->getSystemValueString('cache_path', '');
+        $mounts = [];
 		if ($cacheBaseDir !== '') {
 			$cacheDir = rtrim($cacheBaseDir, '/') . '/' . $user->getUID();
 			if (!file_exists($cacheDir)) {
 				mkdir($cacheDir, 0770, true);
 				mkdir($cacheDir . '/uploads', 0770, true);
 			}
-
-			return [
-				new MountPoint('\OC\Files\Storage\Local', '/' . $user->getUID() . '/cache', ['datadir' => $cacheDir], $loader, null, null, self::class),
-				new MountPoint('\OC\Files\Storage\Local', '/' . $user->getUID() . '/uploads', ['datadir' => $cacheDir . '/uploads'], $loader, null, null, self::class)
-			];
-		} else {
-			return [];
+            $mounts[] = new MountPoint('\OC\Files\Storage\Local', '/' . $user->getUID() . '/cache', ['datadir' => $cacheDir], $loader, null, null, self::class);
 		}
+
+        $uploadsPath = $this->config->getSystemValueString('uploads_path', '');
+        if ($uploadsPath !== '') {
+            $uploadsDir = rtrim($uploadsPath, '/') . '/' . $user->getUID();
+            if (!file_exists($uploadsDir)) {
+                mkdir($uploadsDir, 0770, true);
+            }
+            $mounts[] = new MountPoint('\OC\Files\Storage\Local', '/' . $user->getUID() . '/uploads', ['datadir' => uploadsDir . '/uploads'], $loader, null, null, self::class);
+        }
+
+        return $mounts;
 	}
 }