I'm trying to use the 'daemons' gem to daemonize the ruote engine for a
single workflow. However I seem to be doing something fundamentally wrong.
My code in it's simplest form:
wfid = ruote.launch(workflow)
puts wfid
Daemons.daemonize
r = ruote.wait_for(wfid, :timeout => 10800)
I get the workflow ID but then the workflow doesn't run. I used noisy
output and it just doesn't output anything. I added some debug 'puts' after
the Daemons.daemonize and ruote.wait_for calls and the code get's to the
first but not the second output, so it hangs somewhere in ruote.wait_for.
I also tried Process.daemon in ruby 2.0 as well as a simple
exit if fork
Process.setsid
exit if fork
... redirect outputs to /dev/null, etc. ...
But they all yield the same result. The process outputs the workflow ID,
daemonizes and is running in the process list, but it is not doing
anything. By that I mean that the first participant in the workflow is
supposed to write some data to a redis server and even before that it puts
some text to stdout which should show up in the daemon log file, but it
never does.
Interestingly if I call Daemons.daemonize({ontop: true}) which will make it
stay on top and not fork or detach from the terminal, than it works and the
workflow executes.
I also tried daemonizing the Process before launching the workflow but that
didn't work either. Meaning the workflow launches and the wfid is written
to the daemon log, but after that the first participant in the workflow
isn't doing anything just like before.
Any suggestions what I might be doing wrong or what I could try to better
debug the problem?
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