2718.us blog » nohup http://2718.us/blog Miscellaneous Technological Geekery Tue, 18 May 2010 02:42:55 +0000 en hourly 1 http://wordpress.org/?v=3.0.4 More Hackery with Slug Asterisk http://2718.us/blog/2008/08/18/more-hackery-with-slug-asterisk/ http://2718.us/blog/2008/08/18/more-hackery-with-slug-asterisk/#comments Mon, 18 Aug 2008 05:29:32 +0000 2718.us http://2718.us/blog/?p=95 I wanted to make my slug running Asterisk do wakeup calls, since I currently pay $11/month for a daily wakeup call service and they’ll only try up to 4 times.  As my starting point, I was using this dialplan from the-asterisk-book.com:

  1. [hotel-intern]
  2. exten => _*77*XXXXXXXXXXXX,1,Answer()
  3. exten => _*77*XXXXXXXXXXXX,n,Set(year=${EXTEN:4:4})
  4. exten => _*77*XXXXXXXXXXXX,n,Set(month=${EXTEN:8:2})
  5. exten => _*77*XXXXXXXXXXXX,n,Set(day=${EXTEN:10:2})
  6. exten => _*77*XXXXXXXXXXXX,n,Set(hours=${EXTEN:12:2})
  7. exten => _*77*XXXXXXXXXXXX,n,Set(minutes=${EXTEN:14:2})
  8. exten => _*77*XXXXXXXXXXXX,n,NoOp(Wake-up call scheduled for ${CALLERID(num)} at ${hours}:${minutes} on ${day}.${month}.${year}.)
  9. exten => _*77*XXXXXXXXXXXX,n,System(echo -e "Channel: SIP/${CALLERID(num)}\\nContext: wake-up\\nExtension: 23" > /tmp/${UNIQUEID}.call)
  10. exten => _*77*XXXXXXXXXXXX,n,System(touch -t ${year}${month}${day}${hours}${minutes} /tmp/${UNIQUEID}.call)
  11. exten => _*77*XXXXXXXXXXXX,n,System(mv /tmp/${UNIQUEID}.call /var/spool/asterisk/outgoing/)
  12. exten => _*77*XXXXXXXXXXXX,n,Playback(rqsted-wakeup-for)
  13. exten => _*77*XXXXXXXXXXXX,n,SayNumber(${hours})
  14. exten => _*77*XXXXXXXXXXXX,n,SayNumber(${minutes})
  15. exten => _*77*XXXXXXXXXXXX,n,Hangup()
  16.  
  17. [wake-up]
  18. exten => 23,1,Answer()
  19. exten => 23,n,Wait(1)
  20. exten => 23,n,Playback(this-is-yr-wakeup-call)
  21. exten => 23,n,Wait(1)
  22. exten => 23,n,Hangup()

The problem is that my slug is unslung, running busybox for most basic *nix tools and busybox’s touch command doesn’t support the -t option, so I can’t set the modification time on the file to properly queue it.  My half-assed workaround is a shell script (because I couldn’t get the System() command to run the whole string, try as I might) that nohups a background shell process that sleeps for the difference in seconds between now and the wakeup time, then creates the call file.  Not great for far-future scheduling or for large numbers of calls and it won’t survive a reboot, but it’s a start.

#!/bin/sh
  1.  
  2. nohup sh -c "sleep $((`/bin/date –date="$1" +"%s"` – `/bin/date +"%s"`)) ; echo -e 'Channel: $2\\nContext: wake-up\\nExtension: 23' > /tmp/$3.call ; mv /tmp/$3.call /opt/var/spool/asterisk/outgoing/" >/dev/null &

My Asterisk diaplan macro passes the target time/date string as the first argument, the target channel as the second, and the ${UNIQUEID} as the third.  One further wrinkle:  busybox 1.3.1, which was what came with the unslung firmware I used, doesn’t have nohup, so it won’t work; busybox 1.10.3 is what ipkg installed into /opt/ and has nohup, but the date command in 1.10.3 didn’t seem to support –date (at all, or maybe just not properly), so nohup is a reference to the 1.10.3 busybox in /opt/bin while /bin/date is a reference to the original 1.3.1 busybox.  Stupid, but it works.

(Oh, and as I told the last person I saw wearing a t-shirt that said “If it’s stupid, but it works, then it isn’t stupid,” there’s definitely such a thing as works-but-stupid–this script hackery is such a thing.  The better solution, space permitting, is probably just to install the coreutils package so as to have proper non-busybox touch and date)

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