[Bug 1936871] Re: review-tools unsquashfs test fails on focal for a snap built on xenial

[Alex Murray]

@roadmr - are we still seeing instances of this in the store dashboard?

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https://bugs.launchpad.net/bugs/1936871

Title:
  review-tools unsquashfs test fails on focal for a snap built on xenial

Status in review-tools:
  New
Status in squashfs-tools package in Ubuntu:
  New
Status in squashfs-tools source package in Trusty:
  New
Status in squashfs-tools source package in Xenial:
  New
Status in squashfs-tools source package in Bionic:
  New

Bug description:
  We got a report of a snap that's failing the unsquashfs test.

  See https://forum.snapcraft.io/t/building-wekan-snap-failed/25400.

  I've traced this to some yet-unidentified difference between Ubuntu
  18.04 and 20.04 and maybe their version of unsquashfs/squashfs. I
  installed review-tools on an 18.04 and 20.04 system with the required
  dependencies; running snap-review on a revision of the above snap
  passes on 18.04, and fails as seen in the forum thread with 20.04.

  The timing of when the snap author reports their builds started
  failing, matches the time frame of the snap store servers being
  updated from Ubuntu 18.04 to 20.04 (this happened on 2021-07-05 around
  16:30 UTC).

  So far this is the only snap we've had reports about.

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