[Bug 2035120] [NEW] cryptsetup autopkgtest fails with zstd compressed kernel modules

[Andrea Righi]

Public bug reported:

[Impact]

cryptsetup is using a custom script to create an initramfs and include
kernel modules, however it is encoding *.ko and now that we have zstd
compressed modules in the kernel it fails to include the proper modules
in the initramfs (since the modules are now called *.ko.zst).

[Test case]

Run cryptsetup autopkgtest.

[Fix]

Workaround this issue by unpacking all modules in a temporary extract
directory, so that debian/tests/utils/mkinitramfs can support either
compressed and uncompressed modules.

[Regression potential]

This change fixes the autopkgtest test case, it doesn't touch cryptsetup
at all, so the only regressions that we can experience are in the
autopkgtest.

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: cryptsetup (Ubuntu Mantic)
     Importance: Undecided
         Status: New

** Also affects: cryptsetup (Ubuntu Mantic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2035120

Title:
  cryptsetup autopkgtest fails with zstd compressed kernel modules

Status in cryptsetup package in Ubuntu:
  New
Status in cryptsetup source package in Mantic:
  New

Bug description:
  [Impact]

  cryptsetup is using a custom script to create an initramfs and include
  kernel modules, however it is encoding *.ko and now that we have zstd
  compressed modules in the kernel it fails to include the proper
  modules in the initramfs (since the modules are now called *.ko.zst).

  [Test case]

  Run cryptsetup autopkgtest.

  [Fix]

  Workaround this issue by unpacking all modules in a temporary extract
  directory, so that debian/tests/utils/mkinitramfs can support either
  compressed and uncompressed modules.

  [Regression potential]

  This change fixes the autopkgtest test case, it doesn't touch
  cryptsetup at all, so the only regressions that we can experience are
  in the autopkgtest.

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