I see your point Simon, and I agree thats what I expect too. I think a
case can be made that sometimes "failing safe" means doing something
non-intuitive, though in doing something like that, there has to be a
good reason.

There is no pre-restart stanza, and upon looking at upstart's code, it
simply changes the "goal" state of the job to STOP, then to START, so
this makes sense, though it could be added, it would not be a simple,
natural hook like the pre-stop and pre-start.

About the only way I can think of to retain the expected behavior of
always stopping (which I think is important) and avoid silently
disappearing (even falsely returning 0 on initctl restart) is to simply
warn via the console, when stopping with a broken config, and then fail
in pre-start with the -t check.

Unfortunately, there is some resistance to using 'output console', which
is currently the only way for upstart jobs to communicate with the user
other than daemon.log, which is pretty far removed from a sysadmin in
crisis mode trying to fix their ssh service.

I'm having some trouble even getting restart to work if there are any
pre-stop scripts, so I will continue to look into this.

-- 
service ssh restart does not test the configuration file
https://bugs.launchpad.net/bugs/624361
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