[Bug 1000246] Re: upstart loses track of process ID when /etc/default/ entry contains backticks

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: upstart (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1000246

Title:
  upstart loses track of process ID when /etc/default/ entry contains
  backticks

Status in “upstart” package in Ubuntu:
  Confirmed

Bug description:
  Initially noticed with our autofs5 configuration, which uses `uname `
  to set some architecture specific options for a software distribution
  mount.

  If /etc/default/testapp contains an entry like:
  OPTION=`uname -m`

  Then upstart gets the wrong PID for the daemon.  This means we can't
  stop/restart the service, and shutting down the machine is impossible
  without resetting the power - upstart hangs looking for the wrong
  process ID.

  # status testapp
  testapp start/running, process 854
  # ps -ef | grep testapp
  root       855     1  0 15:04 ?        00:00:00 /root/testapp

  Take the backticks out of /etc/default/testapp and things work as
  expected.

  # cat testapp.c 
  #include <sys/types.h>

  int main(void) {
  	pid_t pid = fork();
  	if ( pid == 0 ) { 
  		while(1) {
  			sleep(10);
  		}
  	} else { 
  		return(0);
  	}
  }

  # cat /etc/default/testapp 
  OPTION=`uname -m`
  # cat /etc/init/testapp.conf 
  description "Test Application"
  author      "foo at bar.com"

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

  expect fork # have also tried 'expect daemon'
  respawn

  script
      if [ -f /etc/default/testapp ] ; then
          . /etc/default/testapp
      fi
      exec /root/testapp
  end script


  lsb_release -rd
  Description:	Ubuntu 12.04 LTS
  Release:	12.04

  # apt-cache policy upstart
  upstart:
    Installed: 1.5-0ubuntu5
    Candidate: 1.5-0ubuntu7
    Version table:
       1.5-0ubuntu7 0
          500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
   *** 1.5-0ubuntu5 0
          500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

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