[Bug 731632] Re: mlocate cron job doesn't respect its lockfile

[Launchpad Bug Tracker]

** Branch linked: lp:~ubuntu-branches/ubuntu/saucy/mlocate/saucy-
proposed

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https://bugs.launchpad.net/bugs/731632

Title:
  mlocate cron job doesn't respect its lockfile

Status in “mlocate” package in Ubuntu:
  New
Status in “mlocate” package in Debian:
  Fix Released

Bug description:
  Binary package hint: mlocate

  The mlocate cron job (/etc/cron.daily/mlocate) doesn't always respect
  its lockfile.  The cron job always removes the lockfile, even if it
  aborts because the lockfile already exists.  The result is that every
  other concurrent invocation of /etc/cron.daily/mlocate will run
  updatedb.

  The bug is pretty obvious.  From /etc/cron.daily/mlocate:

  -----
  trap "rm -f $LOCKFILE" EXIT

  if [ -e "$LOCKFILE" ]; then
      echo >&2 "Warning: $LOCKFILE present, not running updatedb."
      exit 1
  else
      touch "$LOCKFILE"
  fi
  -----

  The trap to remove the lockfile is turned on before checking for the
  existence of the lockfile.  So even if the lockfile exists, we rm it
  on exit.  Moving the trap inside the else block should fix it.

  
  # lsb_release -rd         
  Description:    Ubuntu 10.04 LTS
  Release:        10.04

  # apt-cache policy mlocate
  mlocate:
    Installed: 0.22.2-1ubuntu1
    Candidate: 0.22.2-1ubuntu1

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