Ensure command exists before trying to run

crontabd/main.go

@@ -103,13 +103,29 @@ func loadCronJobs() error {
 		cronExpr := strings.Join(fields[0:5], " ")
 		cmdStr := strings.Join(fields[5:], " ")
 
+		cmdStr, err = filepath.Abs(cmdStr)
+		if err != nil {
+			logger.Error("Failed to find command: %s", cmdStr)
+			continue
+		}
+		cmdStr = filepath.Clean(cmdStr)
+
+		file, err := os.OpenFile(cmdStr, os.O_RDONLY, 0644)
+		if err != nil {
+			logger.Error("Failed to find command: %s", cmdStr)
+			continue
+		}
+		file.Close()
+
+		logger.Info("Adding cron job: %s -> %s", cronExpr, cmdStr)
+
 		job := CronJob{
 			Cron:    cronExpr,
 			Command: cmdStr,
 		}
 
 		// Add the job to cron
-		_, err := cronRunner.AddFunc(job.Cron, createJobFunc(job))
+		_, err = cronRunner.AddFunc(job.Cron, createJobFunc(job))
 		if err != nil {
 			logger.Error("Failed to add cron job %+v: %v", job, err)
 			continue
@@ -124,6 +140,7 @@ func loadCronJobs() error {
 
 func createJobFunc(job CronJob) func() {
 	return func() {
+		logger.Info("Executing command: %s", job.Command)
 		cmd := exec.Command(job.Command)
 		output, err := cmd.CombinedOutput()
 		if err != nil {