Merge pull request #62279 from nextcloud/backport/61830/stable34

[stable34] fix(jobs): resolve portability issues with background job cleanup

Author: AndyScherzinger

core/BackgroundJobs/CleanupBackgroundJobsJob.php

@@ -47,11 +47,9 @@ private function reapCrashedJobs(): void {
 			if ($job->serverId !== $currentServerId) {
 				continue;
 			}
-			$output = [];
-			$result = 0;
-			exec('ps -p ' . escapeshellarg((string)$job->pid) . ' -o cmd', $output, $result);
-			if (count($output) === 1 && current($output) === 'CMD' && $result === 1) {
-				// Process doesn't exists anymore
+			$processExists = posix_kill($job->pid, 0) || posix_get_last_error() === 1 /* EPERM */;
+			if (!$processExists) {
+				// Process doesn't exist anymore
 				$maxDuration = (new DateTimeImmutable())->diff($job->startedAt);
 				$maxDuration
 					= ($maxDuration->days * 24 * 60 * 60 * 1000)

lib/private/BackgroundJob/JobRuns.php

@@ -63,7 +63,6 @@ public function finished(int|string $runId, int $duration, int $memoryPeakUsage,
 
 	public function deleteBefore(int $timestamp): int {
 		$beforeSnowflake = $this->snowflakeGenerator->minForTimeId($timestamp);
-		$beforeSnowflake = '91480652934574081';
 		$qb = $this->connection->getQueryBuilder();
 		$result = $qb
 			->delete(self::TABLE)