Properly daemonize the mail_room process
The old invocation only worked by accident because we have a '&' somewhere in the init script for expediency. When ran from a terminal, the mail_room daemon process ended up in the session of the terminal. This commit adds a small wrapper that tries to do the textbook daemonization steps (double fork, setsid etc.) while also taking care that the pidfile is written before the 'start' process exits.
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@ -0,0 +1,33 @@
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#!/usr/bin/env ruby
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# daemon_with_pidfile
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#
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# Daemonize, write a pidfile, and exec the remainder of the command line.
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def main(pidfile, cmd)
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if middle_pid = Process.fork
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# outer process
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# Do not exit the outer process before the middle process finishes
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Process.waitpid(middle_pid)
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exit $?.exitstatus
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end
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if final_pid = Process.fork
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# middle process
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open(pidfile, 'w') { |f| f.puts final_pid }
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exit
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end
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# Standard daemon things: become session leader, ignore SIGHUP, close stdin.
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Signal.trap("HUP", "IGNORE")
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Process.setsid
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IO.new(0).close
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exec(*cmd)
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end
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if ARGV.count < 2
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abort "Usage: #$0 pidfile command [args...]"
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end
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pidfile = ARGV.shift
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main(pidfile, ARGV)
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@ -19,9 +19,7 @@ get_mail_room_pid()
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start()
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{
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bundle exec mail_room -q -c $mail_room_config >> $mail_room_logfile 2>&1 &
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PID=$!
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echo $PID > $mail_room_pidfile
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bin/daemon_with_pidfile $mail_room_pidfile bundle exec mail_room -q -c $mail_room_config >> $mail_room_logfile 2>&1
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}
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stop()
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