make sure that we don't try to access an already deleted files, fixes some file source not found warnings

3 files changed, 50 insertions, 16 deletions

diff --git a/apps/files_versions/appinfo/app.php b/apps/files_versions/appinfo/app.php
index 5b1e464ba6c..8f2071dd7b6 100644
--- a/apps/files_versions/appinfo/app.php
+++ b/apps/files_versions/appinfo/app.php
@@ -12,6 +12,7 @@ OCP\Util::addStyle('files_versions', 'versions');
 OCP\Util::connectHook('OC_Filesystem', 'write', "OCA\Files_Versions\Hooks", "write_hook");
 // Listen to delete and rename signals
 OCP\Util::connectHook('OC_Filesystem', 'post_delete', "OCA\Files_Versions\Hooks", "remove_hook");
+OCP\Util::connectHook('OC_Filesystem', 'delete', "OCA\Files_Versions\Hooks", "pre_remove_hook");
 OCP\Util::connectHook('OC_Filesystem', 'rename', "OCA\Files_Versions\Hooks", "rename_hook");
 //Listen to delete user signal
 OCP\Util::connectHook('OC_User', 'pre_deleteUser', "OCA\Files_Versions\Hooks", "deleteUser_hook");
diff --git a/apps/files_versions/lib/hooks.php b/apps/files_versions/lib/hooks.php
index 81ee3c8b3c6..5d3882cc3e3 100644
--- a/apps/files_versions/lib/hooks.php
+++ b/apps/files_versions/lib/hooks.php
@@ -46,6 +46,17 @@ class Hooks {
 	}
 
 	/**
+	 * @brief mark file as "deleted" so that we can clean up the versions if the file is gone
+	 * @param array $params
+	 */
+	public static function pre_remove_hook($params) {
+		$path = $params[\OC\Files\Filesystem::signal_param_path];
+			if($path<>'') {
+				Storage::markDeletedFile($path);
+			}
+	}
+
+	/**
 	 * @brief rename/move versions of renamed/moved files
 	 * @param array with oldpath and newpath
 	 *
@@ -53,7 +64,7 @@ class Hooks {
 	 * of the stored versions along the actual file
 	 */
 	public static function rename_hook($params) {
-		
+
 		if (\OCP\App::isEnabled('files_versions')) {
 			$oldpath = $params['oldpath'];
 			$newpath = $params['newpath'];
@@ -71,7 +82,7 @@ class Hooks {
 	 * to remove the used space for versions stored in the database
 	 */
 	public static function deleteUser_hook($params) {
-		
+
 		if (\OCP\App::isEnabled('files_versions')) {
 			$uid = $params['uid'];
 			Storage::deleteUser($uid);
diff --git a/apps/files_versions/lib/versions.php b/apps/files_versions/lib/versions.php
index 3ad73284ef2..65ed33fe2a0 100644
--- a/apps/files_versions/lib/versions.php
+++ b/apps/files_versions/lib/versions.php
@@ -21,6 +21,9 @@ class Storage {
 	const DEFAULTMAXSIZE=50; // unit: percentage; 50% of available disk space/quota
 	const VERSIONS_ROOT = 'files_versions/';
 
+	// files for which we can remove the versions after the delete operation was successful
+	private static $deletedFiles = array();
+
 	private static $max_versions_per_interval = array(
 		//first 10sec, one version every 2sec
 		1 => array('intervalEndsAfter' => 10,      'step' => 2),
@@ -142,25 +145,44 @@ class Storage {
 
 
 	/**
+	 * @brief mark file as deleted so that we can remove the versions if the file is gone
+	 * @param string $path
+	 */
+	public static function markDeletedFile($path) {
+		list($uid, $filename) = self::getUidAndFilename($path);
+		self::$deletedFiles[$path] = array(
+			'uid' => $uid,
+			'filename' => $filename);
+	}
+
+	/**
 	 * Delete versions of a file
 	 */
-	public static function delete($filename) {
-		list($uid, $filename) = self::getUidAndFilename($filename);
-		$versions_fileview = new \OC\Files\View('/'.$uid .'/files_versions');
+	public static function delete($path) {
 
-		$abs_path = $versions_fileview->getLocalFile($filename.'.v');
-		if( ($versions = self::getVersions($uid, $filename)) ) {
-			$versionsSize = self::getVersionsSize($uid);
-			if ( $versionsSize === false || $versionsSize < 0 ) {
-				$versionsSize = self::calculateSize($uid);
-			}
-			foreach ($versions as $v) {
-				unlink($abs_path . $v['version']);
-				\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $abs_path . $v['version']));
-				$versionsSize -= $v['size'];
+		$deletedFile = self::$deletedFiles[$path];
+		$uid = $deletedFile['uid'];
+		$filename = $deletedFile['filename'];
+
+		if (!\OC\Files\Filesystem::file_exists($path)) {
+
+			$versions_fileview = new \OC\Files\View('/' . $uid . '/files_versions');
+
+			$abs_path = $versions_fileview->getLocalFile($filename . '.v');
+			if (($versions = self::getVersions($uid, $filename))) {
+				$versionsSize = self::getVersionsSize($uid);
+				if ($versionsSize === false || $versionsSize < 0) {
+					$versionsSize = self::calculateSize($uid);
+				}
+				foreach ($versions as $v) {
+					unlink($abs_path . $v['version']);
+					\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $abs_path . $v['version']));
+					$versionsSize -= $v['size'];
+				}
+				self::setVersionsSize($uid, $versionsSize);
 			}
-			self::setVersionsSize($uid, $versionsSize);
 		}
+		unset(self::$deletedFiles[$path]);
 	}
 
 	/**