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[Launchpad Bug Tracker <1555305@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package squashfs-tools -
1:4.3-3ubuntu2.17.04.1

---------------
squashfs-tools (1:4.3-3ubuntu2.17.04.1) zesty; urgency=medium

  * debian/patches/0007-unsquashfs-preserve-symlink-times.patch: Preserve
    atime and mtime of symlink inodes in unsquashfs rather than using the
    current time (LP: #1555305)

 -- Tyler Hicks <tyhicks@xxxxxxxxxxxxx>  Mon, 11 Dec 2017 21:02:54 +0000

** Changed in: squashfs-tools (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

** Changed in: squashfs-tools (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1555305

Title:
  resquashfs test fails if snap has symlinks

Status in click-reviewers-tools package in Ubuntu:
  Invalid
Status in squashfs-tools package in Ubuntu:
  Fix Released
Status in squashfs-tools source package in Trusty:
  Fix Released
Status in squashfs-tools source package in Xenial:
  Fix Released
Status in squashfs-tools source package in Zesty:
  Fix Released
Status in squashfs-tools source package in Artful:
  Fix Released
Status in squashfs-tools source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * The unsquashfs utility does not preserve atime and mtime timestamps
     of symlink inodes when unpacking squashfs images.

   * This makes it impossible to use a combination of unsquashfs and
     mksquashfs to sanity check snaps uploaded to the snap store since
     the resulting snap will not match the original snap due to symlink
     times being set to the current time when unsquashfs was executed.

  [Test Case]

   * Extract the test image:
     $ unsquashfs -d lp1555305 lp1555305.squashfs

   * Check the timestamp of the "link" file
     $ ls -al lp1555305/link

   * Incorrect output (timestamp will be current time):
     lrwxrwxrwx  1 tyhicks tyhicks    4 Dec 11 22:05 link -> file

   * Expected output:
     lrwxrwxrwx 1 tyhicks tyhicks 4 Aug 25  1991 /tmp/lp1555305/link -> file

  [Regression Potential]

   * The regression potential is small as long as there is no software
     out there that depends on the behavior of setting symlink timestamps
     to the current time. I highly doubt that there is anything out there
     that relies on that behavior but there's always a chance.

  [Original Descipription]

  Create the files:
  $ mkdir test
  $ cd test
  $ touch foo
  $ ln -s foo bar
  $ mkdir meta
  $ cat >meta/snap.yaml <<EOM
  name: test
  version: 1.0
  architectures: [all]
  EOM

  Create the initial snap
  $ cd ..
  $ snapcraft snap ./test
  ...
  Snapped test_1.0_all.snap

  Unsquash the snap:
  $ unsquashfs -d unsquashed test_1.0_all.snap
  Parallel unsquashfs: Using 4 processors
  3 inodes (2 blocks) to write

  [=======================================================================|]
  2/2 100%

  created 2 files
  created 2 directories
  created 1 symlinks
  created 0 devices
  created 0 fifos

  Resquash the snap (the sleep is to make sure the time changes on the symlink):
  $ unsquashfs -fstime ./test_1.0_all.snap
  1457551603
  $ mksquashfs ./unsquashed ./test_1.0_all.snap.repacked -fstime 1457551603 -noappend -comp xz -all-root -no-xattrs
  ...

  Compare:
  $ sha512sum test_1.0_all.snap
  40a15430503783541b362942491ee614b16941676d6c3edd86005af7b6b0782374e41c0c006dccb3a164d2c0270ace66639fcdee5ece3571db1c7544d59030e3  test_1.0_all.snap

  $ sha512sum test_1.0_all.snap.repack
  d8b9626337b8f09288f6aab675041dba639523437dd1d8f11b3f883cfa73ea434f2be06f5cd9cdec4ac9bdf2a40f8b484dc516ec851870c81be133cbdebf35a4  test_1.0_all.snap.repack

  Removing the symlink makes the check work.

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