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[Bug 1652117] Re: sbuild-launchpad-chroot doesn't detect current overlayfs

 

** No longer affects: sbuild-launchpad-chroot (Ubuntu Xenial)

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https://bugs.launchpad.net/bugs/1652117

Title:
  sbuild-launchpad-chroot doesn't detect current overlayfs

Status in sbuild-launchpad-chroot package in Ubuntu:
  Triaged
Status in sbuild-launchpad-chroot source package in Yakkety:
  Triaged
Status in sbuild-launchpad-chroot source package in Zesty:
  Triaged

Bug description:
  With the switch from out of tree overlayfs to in-tree overlay, sbuild-
  launchpad-chroot must be updated to properly detect both of those,
  otherwise users end up with a "directory" type chroot that doesn't use
  unioning and so looses a few of the useful features provided by this
  tool.

  # Rationale
  New kernel doesn't have a "overlayfs" module, it's now called "overlay".
  Both names should be used in the detection code.

  # Test case
   - Before upgrade
     - sbuild-launchpad-chroot create -n test -s xenial -a amd64
     - Check that /etc/schroot/chroot.d/test doesn't contain "union-type"
     - sbuild-launchpad-chroot remove -n test
   - After upgrade
     - sbuild-launchpad-chroot create -n test -s xenial -a amd64
     - Check that /etc/schroot/chroot.d/test contains "union-type"
     - sbuild-launchpad-chroot remove -n test

  # Regression potential
  Not much, this won't affect anyone who has existing chroots, it only affects new chroots and re-introduces the behavior that people have been expecting up until the time where the overlayfs driver was removed from the kernel.

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