Exit container_cleanup.sh early if there's nothing to do; also don't autorestart it

Author: matyasselmeci

00-cleanup.conf

@@ -4,3 +4,5 @@ priority=-1
 stdout_logfile=/dev/stdout
 stdout_logfile_maxbytes=0
 redirect_stderr=true
+autorestart=false
+startsecs=0

container_cleanup.sh

@@ -1,5 +1,9 @@
 #!/bin/bash
 
+if [[ -z $(shopt -s nullglob && echo /etc/osg/image-cleanup.d/*.sh) ]]; then
+    exit 0
+fi
+
 # Allow child images to add cleanup customizations
 source_cleanup () {
     for x in /etc/osg/image-cleanup.d/*.sh; do source "$x"; done