[Bug 1741563] [NEW] initramfs compression changed in bionic for shipped kernel

[Robert C Jennings]

Public bug reported:

The shipped initrd doesn't match the compression that you'd get if you
update the initrd on bionic:

# A clean bionic cloud-image
$ file /boot/initrd.img-4.13.0-17-generic
/boot/initrd.img-4.13.0-17-generic: LZMA compressed data, streamed

# Update the initramfs (notice the deprecation warnings too)
$ sudo update-initramfs -k all -u
update-initramfs: Generating /boot/initrd.img-4.13.0-17-generic
WARNING: Setting CRYPTSETUP in /etc/initramfs-tools/initramfs.conf is deprecated and will stop working in the future. Use /etc/cryptsetup-initramfs/conf-hook instead.

# Now initramfs is gzip compressed when packaged initramfs was LZMA
$ file /boot/initrd.img-4.13.0-17-generic
/boot/initrd.img-4.13.0-17-generic: gzip compressed data, last modified: Fri Jan 5 20:54:07 2018, from Unix

$ apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.125ubuntu13
  Candidate: 0.125ubuntu13
  Version table:
 *** 0.125ubuntu13 500
        500 http://us-west-2.ec2.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1741563

Title:
  initramfs compression changed in bionic for shipped kernel

Status in initramfs-tools package in Ubuntu:
  Incomplete

Bug description:
  The shipped initrd doesn't match the compression that you'd get if you
  update the initrd on bionic:

  # A clean bionic cloud-image
  $ file /boot/initrd.img-4.13.0-17-generic
  /boot/initrd.img-4.13.0-17-generic: LZMA compressed data, streamed

  # Update the initramfs (notice the deprecation warnings too)
  $ sudo update-initramfs -k all -u
  update-initramfs: Generating /boot/initrd.img-4.13.0-17-generic
  WARNING: Setting CRYPTSETUP in /etc/initramfs-tools/initramfs.conf is deprecated and will stop working in the future. Use /etc/cryptsetup-initramfs/conf-hook instead.

  # Now initramfs is gzip compressed when packaged initramfs was LZMA
  $ file /boot/initrd.img-4.13.0-17-generic
  /boot/initrd.img-4.13.0-17-generic: gzip compressed data, last modified: Fri Jan 5 20:54:07 2018, from Unix

  $ apt-cache policy initramfs-tools
  initramfs-tools:
    Installed: 0.125ubuntu13
    Candidate: 0.125ubuntu13
    Version table:
   *** 0.125ubuntu13 500
          500 http://us-west-2.ec2.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

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