[Bug 1820898] Re: grub in xenial fails to read pc-linux 4.15 kernel snap

[Mathieu Trudel-Lapierre]

Verification-done on xenial:

ubuntu at profound-donkey:~$ snap download pc-kernel --channel 18
Fetching snap "pc-kernel"
Fetching assertions for "pc-kernel"
Install the snap with:
   snap ack pc-kernel_192.assert
   snap install pc-kernel_192.snap
ubuntu at profound-donkey:~$ grub-fstest pc-kernel_192.snap crc /vmlinuz
441609b6
ubuntu at profound-donkey:~$ dpkg -l grub\* | grep ii
ii  grub-common           2.02~beta2-36ubuntu3.21         amd64        GRand Unified Bootloader (common files)
ii  grub-efi-amd64        2.02~beta2-36ubuntu3.21         amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 version)
ii  grub-efi-amd64-bin    2.02~beta2-36ubuntu3.21         amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 binaries)
ii  grub-efi-amd64-signed 1.66.21+2.02~beta2-36ubuntu3.21 amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 version, signed)
ii  grub2-common          2.02~beta2-36ubuntu3.21         amd64        GRand Unified Bootloader (common files for version 2)

grub behaves as expected given the grub-fstest test case provided.

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1820898

Title:
  grub in xenial fails to read pc-linux 4.15 kernel snap

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed

Bug description:
  The grub version in xenial fails to read the pc-kernel 4.15 kernel
  snap.

  [Test Case] To reproduce (thanks to Colin for the grub-fstest hint):

  $ snap download pc-kernel --channel 18
  $ grub-fstest pc-kernel_192.snap crc /vmlinuz

  This fails with the xenial grub with:
  grub-fstest: error: read error at offset 8096256: invalid xz chunk.

  but it should work (it works correctly with the grub2 from bionic and
  later).

  Colin pointed to
  https://git.savannah.gnu.org/cgit/grub.git/commit/?id=951306c5094d2bfb46d5baedfde84a2015c4a3fa
  which may fix the issue.

  [Regression Potential] The fix is in GRUB's squash4 module, so only
  workloads that involve reading squashfses could be affected.

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