[Bug 1058356] Re: fails to install when kernel does not provide block_suspend capability

[Jamie Strandboge]

Downgrading the priority for now. I still believe we should fix this in
an SRU because this is the 3rd bug we've seen on this, so people are
hitting it.

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

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

Status in “upstart” package in Ubuntu:
  Fix Committed
Status in “upstart” source package in Quantal:
  Fix Committed

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.

  [TESTCASE]
   * 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 when cups is restarted

  Previous report:
  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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