minor

acme-downloader.sh

 #!/bin/bash
 #
 # exit 0: the certificate still looks good and it won't be replaced
-# exit 1: a new certificate was installed and we need to reload our service
-# exit 2: uh, oh something went wrong
+# exit 64: a new certificate was installed and we need to reload our service
+# anything else: something went wrong
 #
 # the certificate will be checked, if it is valid, if the key matches
 # and if it contains at least the cert-name