[Bug 1929370] [NEW] Backport support for the -lln command-line option to unsquashfs for 18.04

[Alex Murray]

Public bug reported:

The snap store review-tools is changing to compare snaps based on their
numeric uid/gids rather than user/group names (see
https://code.launchpad.net/~alexmurray/review-tools/+git/review-
tools/+merge/403103 for more details).

Currently the snap store dashboard, where the review-tools are run, is
running Ubuntu 18.04 - which is based on squashfs-tools 4.3 - however
support for the -lln command-line option was only added in the 4.4
release. This change https://github.com/plougher/squashfs-
tools/commit/a78a589a55a8524ef31ba06ea7c752b8aa8b3604 is relatively
simple and can be backported to squashfs-tools in 18.04 with minimal
effort.

** Affects: squashfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: squashfs-tools (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Alex Murray (alexmurray)
         Status: New

** Also affects: squashfs-tools (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: squashfs-tools (Ubuntu Bionic)
     Assignee: (unassigned) => Alex Murray (alexmurray)

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https://bugs.launchpad.net/bugs/1929370

Title:
  Backport support for the -lln command-line option to unsquashfs for
  18.04

Status in squashfs-tools package in Ubuntu:
  New
Status in squashfs-tools source package in Bionic:
  New

Bug description:
  The snap store review-tools is changing to compare snaps based on
  their numeric uid/gids rather than user/group names (see
  https://code.launchpad.net/~alexmurray/review-tools/+git/review-
  tools/+merge/403103 for more details).

  Currently the snap store dashboard, where the review-tools are run, is
  running Ubuntu 18.04 - which is based on squashfs-tools 4.3 - however
  support for the -lln command-line option was only added in the 4.4
  release. This change https://github.com/plougher/squashfs-
  tools/commit/a78a589a55a8524ef31ba06ea7c752b8aa8b3604 is relatively
  simple and can be backported to squashfs-tools in 18.04 with minimal
  effort.

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