fix(snowflakes): create file lock files into lock directory

Signed-off-by: Benjamin Gaussorgues <[email protected]>

Author: Altahrim

lib/private/Snowflake/FileSequence.php

@@ -27,12 +27,15 @@ class FileSequence implements ISequence {
 	public function __construct(
 		ITempManager $tempManager,
 	) {
-		$this->workDir = $tempManager->getTempBaseDir() . '/' . self::LOCK_FILE_DIRECTORY;
+		$this->workDir = $tempManager->getTempBaseDir() . '/' . self::LOCK_FILE_DIRECTORY . '/';
 		$this->ensureWorkdirExists();
 	}
 
 	private function ensureWorkdirExists(): void {
 		if (is_dir($this->workDir)) {
+			if (!is_writable($this->workDir)) {
+				throw new \Exception('File sequence directory exists but is not writable');
+			}
 			return;
 		}