[Bug 1478684] Re: 'overlay' union-type is not supported

[Mathew Hodson]

*** This bug is a duplicate of bug 1398569 ***
    https://bugs.launchpad.net/bugs/1398569

** This bug has been marked a duplicate of bug 1398569
   schroot overlay v2 support

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https://bugs.launchpad.net/bugs/1478684

Title:
  'overlay' union-type is not supported

Status in schroot package in Ubuntu:
  New

Bug description:
  EDIT: I saw this bug report which actually says this is fixed
  https://bugs.launchpad.net/ubuntu/+source/schroot/+bug/1398569
  but I don't see where the change is supposed to be.
  I also saw it's already reported on the debian bug system:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785136
  and git
  https://github.com/codelibre-net/schroot/issues/1
  It's not very clear which repository is supposed to be the main one, I guess the debian one.

  The kernel changed the name of overlayfs to overlay (see
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ef94b1864d1ed5be54376404bb23d22ed0481feb
  ) and added the workdir option to the mount options.

  The overlay union-type should be added to the allowed list, the
  10mount script should be updated to add the workdir option for the
  overlay union-type, with I suppose a variable
  CHROOT_UNION_WORKDIR_DIRECTORY and the corresponding schroot
  configuration option.

  Additional info:

  Error when running schroot:
  schroot --option=union-type=overlay
  E: /etc/schroot/chroot.d/click-ubuntu-sdk-15.04-armhf: line 12 [click-ubuntu-sdk-15.04-armhf] union-type: Unknown filesystem union type ‘overlay’

  Functions with the check:

  lib/schroot/chroot/facet/fsunion.cc-143- void
  lib/schroot/chroot/facet/fsunion.cc-144- fsunion::set_union_type (const std::string& type)
  lib/schroot/chroot/facet/fsunion.cc-145- {
  lib/schroot/chroot/facet/fsunion.cc-146- if (type == "aufs" ||
  lib/schroot/chroot/facet/fsunion.cc:147: type == "overlayfs" ||
  lib/schroot/chroot/facet/fsunion.cc-148- type == "unionfs" ||
  lib/schroot/chroot/facet/fsunion.cc-149- type == "none")
  lib/schroot/chroot/facet/fsunion.cc-150- this->union_type = type;
  lib/schroot/chroot/facet/fsunion.cc-151- else
  lib/schroot/chroot/facet/fsunion.cc-152- throw error(type, FSUNION_TYPE_UNKNOWN);

  In the 10mount script:
  overlayfs)
                   CHROOT_UNION_MOUNT_OPTIONS="lowerdir=${CHROOT_UNION_UNDERLAY_DIRECTORY},upperdir=${CHROOT_UNION_OVERLAY_DIRECTORY}"

  Steps to reproduce:

  Try to run a schroot with option union-type=overlay:
  schroot --option=union-type=overlay

  I found this issue on Archlinux, and I guess it will eventually apply
  to Ubuntu when the kernel is updated.

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