if s6-svstat myserver; then client_binary else send_email_to_admin faux_client_binary fi
Please don't do this. - As Steve would be able to tell you if he had read the documentation page for s6-svstat (https://skarnet.org/software/s6/s6-svstat.html), "s6-svstat myserver"'s exit code does not mirror whether myserver is running or not. If myserver is a live service directory, s6-svstat will print a line to stdout summarizing the status of the service, then exit 0. Zero, even if the service is down, so client_binary will fail. s6-svstat will only exit nonzero if an error occurs or if no supervisor is running on myserver, which is not what this script aims to test. - It is good to notify the admin when something on the system is not working correctly. Doing it automatically from a script, however, is not a good idea. Spamming the admin's mailbox via automated messages is an great way to get yourself ignored at best (which defeats the purpose of reporting bugs) or banned at worst. - If you're using s6, as I said earlier, you're supposed to be able to assume that myserver is running, and you don't have to write such wrappers, even ones that would work. -- Laurent
