I have the following job in /etc/init/collector:

start on runlevel [2345]
stop on runlevel [!2345]

expect daemon

exec /usr/bin/twistd -y /path/to/my/tac/file

When I start the job with sudo service collector start, it hangs. If I ctrl-c and run initctl list, I see this:

collector start/killed, process 616

I can't see an instance of the twistd daemon in ps, and the HTTP server it's supposed to be providing does not exist.

I even tried this without 'expect daemon' and with a simple call to a one-line bash script using a script stanza, and it still doesn't work. I think I'm doing something very wrong. What could it be?