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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** Changed in: cups (Ubuntu)
       Status: New => Invalid

** Changed in: cups (Ubuntu Quantal)
       Status: Won't Fix => Invalid

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https://bugs.launchpad.net/bugs/1058356

Title:
  cups fails to install when kernel does not provide block_suspend
  capability

Status in cups package in Ubuntu:
  Invalid
Status in upstart package in Ubuntu:
  Fix Released
Status in cups source package in Quantal:
  Invalid
Status in upstart source package in Quantal:
  Fix Released

Bug description:
  [Impact]

  * Some users upgrading from 12.04 LTS to 12.10 have encountered upgrade
    errors because apparmor_parser fails to load new policy on an old kernel.
    Specifically, the block_suspend capability is new in the 12.10 kernel and
    does not exist in the 12.04 LTS kernel.

  * On upgrade, the cups upstart job calls /lib/init/apparmor-profile-load
    from upstart, which in turn calls apparmor_parser. apparmor_parser can
    exit with error on upgrades causing the upstart job to fail.

  [Test Case]

  * Regular upgrades using do-release-upgrade or update-manager don't seem to
    be affected, so it is best to:

  * Obtain the apparmor profile from the 12.10 cups package[1], copy it to
    /etc/apparmor.d/usr.sbin.cupsd and then perform 'sudo stop cups ; sudo
    start cups'.

  * If the bug is not fixed, you will see 'start: Job failed to start'. If it
    is fixed, you will see 'cups start/running, process ####'.

  [1]http://bazaar.launchpad.net/~ubuntu-
  branches/ubuntu/quantal/cups/quantal /view/head:/debian/local
  /apparmor-profile

  [Regression Potential]

  * The regression potential is extremely low. The only change is adding '||
    exit 0' to a shell script.

  [Other Info]

  * This has been discussed with the security team, the release team and
    foundations and we all agree this is the best fix at this time.

  * On upgrades, upstart is unpacked very early (much earlier than cups), so
    the new /lib/init/apparmor-profile-load should be in place before the
    upstart job is used

  * apparmor_parser failure will not remove the old profile when it faces this
    error condition, so the program will not go unconfined

  On our Jenkins builds we're getting a failure to install the cups
  package.  This seems to be because the apparmor profile looks for
  suspend capability but the virtualized builders do not have it.  Here
  seems to be the relevant log:

  AppArmor parser error for /etc/apparmor.d/usr.sbin.cupsd in /etc/apparmor.d/usr.sbin.cupsd at line 24: Invalid capability block_suspend.
  start: Job failed to start
  invoke-rc.d: initscript cups, action "start" failed.
  dpkg: error processing cups (--configure):
   subprocess installed post-installation script returned error exit status 1
  Errors were encountered while processing:
   cups
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  Full log: https://jenkins.qa.ubuntu.com/job/indicator-session-
  ci/label=quantal/16/console

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