[Bug 1932542] Re: Add support for zstd

[Łukasz Zemczak]

Hello Dimitri, or anyone else affected,

Accepted initramfs-tools into focal-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/initramfs-
tools/0.136ubuntu6.6 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: initramfs-tools (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1932542

Title:
  Add support for zstd

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * initramfs-tools in impish has changed default initrd compression to
  zstd. To allow compressing and uncompressing such initrds on Focal LTS
  release we should backport zstd support in the mkinitramfs &
  unmkinitramffs tooling. For example ubuntu-cdimage uses unmkinitramfs
  tool to unpack and inspect impish initrds on a focal host.

   * Cherrypicking the feature from 0.138 release, which is also present
  in Hirsute and Impish.

  [Test Plan]

   * Create initrd with zstd $ mkinitramfs -c zstd -o zstd-initrd.img

   * Uncompress it with $ unmkinitramfs ./zstd-initrd.img zstd-initrd-
  unpacked

  [Where problems could occur]

   * This adds support for zstd compressed initrd in both mkinitramfs
  and unmkinitramfs. However our GA kernels do not support zstd
  compressed initrds. And depends on zstd package is not added either.
  Meaning one still has to install zstd to gain the unpack support.
  Changing initramfs.conf to zstd may result in unbootable instance when
  used with GA kernel.

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