fix(snowflakes): FileSequence generator must always use the same dir

lib/private/Snowflake/FileSequence.php

@@ -15,6 +15,8 @@
 class FileSequence implements ISequence {
 	/** Number of files to use */
 	private const NB_FILES = 20;
+	/** Lock file directory **/
+	public const LOCK_FILE_DIRECTORY = 'sfi_file_sequence';
 	/** Lock filename format **/
 	private const LOCK_FILE_FORMAT = 'seq-%03d.lock';
 	/** Delete sequences after SEQUENCE_TTL seconds **/
@@ -25,7 +27,25 @@ class FileSequence implements ISequence {
 	public function __construct(
 		ITempManager $tempManager,
 	) {
-		$this->workDir = $tempManager->getTemporaryFolder('.snowflakes');
+		$this->workDir = $tempManager->getTempBaseDir() . '/' . self::LOCK_FILE_DIRECTORY;
+		$this->ensureWorkdirExists();
+	}
+
+	private function ensureWorkdirExists(): void {
+		if (is_dir($this->workDir)) {
+			return;
+		}
+
+		if (@mkdir($this->workDir, 0700)) {
+			return;
+		}
+
+		// Maybe the directory was created in the meantime
+		if (is_dir($this->workDir)) {
+			return;
+		}
+
+		throw new \Exception('Fail to create file sequence directory');
 	}
 
 	#[Override]

tests/lib/Snowflake/FileSequenceTest.php

@@ -20,16 +20,16 @@ class FileSequenceTest extends ISequenceBase {
 
 	public function setUp():void {
 		$tempManager = $this->createMock(ITempManager::class);
-		$this->path = uniqid(sys_get_temp_dir() . '/php_test_seq_', true);
-		mkdir($this->path);
-		$tempManager->method('getTemporaryFolder')->willReturn($this->path);
+		$this->path = sys_get_temp_dir();
+		$tempManager->method('getTempBaseDir')->willReturn($this->path);
 		$this->sequence = new FileSequence($tempManager);
 	}
 
 	public function tearDown():void {
-		foreach (glob($this->path . '/*') as $file) {
+		$lockDirectory = $this->path . '/' . FileSequence::LOCK_FILE_DIRECTORY;
+		foreach (glob($lockDirectory . '/*') as $file) {
 			unlink($file);
 		}
-		rmdir($this->path);
+		rmdir($lockDirectory);
 	}
 }