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[Bug 1721279] Re: Improve teardown_mountpoint to recursively find all submounts and unmount them

 

This bug was fixed in the package livecd-rootfs - 2.408.21

---------------
livecd-rootfs (2.408.21) xenial; urgency=medium

  [ Balint Reczey ]
  * Use kvm kernel only on amd64.
  * Make non-x86 minimized images consistent with x86 by not explicitly
    installing the server task.
  * Clean up dangling /boot/initrd.img symlink left behind on minimized
    builds.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Fri, 20 Oct 2017
23:10:29 -0700

** Changed in: livecd-rootfs (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1721279

Title:
  Improve teardown_mountpoint to recursively find all submounts and
  unmount them

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Released

Bug description:
  [SRU Justification]

  The teardown_mountpoint function was back-ported to Xenial recently but
  the hard coded list of mounts to unmount makes using it problematic when
  different features require different set of mounts.
  This change set improves teardown_mountpoint to recursively find all submounts and unmount them, instead of working from a hard-coded list.  This makes the code resilient against other submounts being added later, including downstream.

  [Test case]

  Autopkgtest excercises this code-path but to be on the safe side all
  cloud images need to be test-built, too.

  [Regression potential]

  This change may break building images or the host system by unmounting
  host's mounts.

  [Other Info]

   * This is an improvement of LP: #1716992
   * The fix also removes sleep / udevadm settle calls which seem to be obsolete

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