I've started working on an online and CLI app that can be used to check 3rd party mirrors. So far so good, but there's a way to go yet.
I'm thinking of putting the code under tools because it is usable via CLI as well. Hope that's OK. We can then add a CGI wrapper to allow it to be used from Whimsy. I think initially it should be restricted to members and officers. The idea is to be able generate text suitable for pasting into a JIRA issue (e.g. for errors). It could even generate the required data for updating the mirror list one day. But eventually it should be usable by mirror admins to pre-check their mirrors. That may need some authentication - e.g. mailing address callback - to prevent misuse. S.