[Bug 1832108] Re: unmkinitramfs fails with lz4 compressed initrds

[Dimitri John Ledkov]

uncompressed:

7330304 bytes read in 311 ms (22.5 MiB/s)
reboot time 39.39s
2019-07-04T16:54:38.050180+0000 localhost kernel: Unpacking initramfs...
2019-07-04T16:54:38.050253+0000 localhost kernel: Freeing initrd memory: 7200K

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https://bugs.launchpad.net/bugs/1832108

Title:
  unmkinitramfs fails with lz4 compressed initrds

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Cosmic:
  In Progress
Status in initramfs-tools source package in Disco:
  Fix Released
Status in initramfs-tools package in Debian:
  New

Bug description:
  [Impact]

   * Cannot unpack initrds compressed with lz4 due to changes in lz4

  [Test Case]

  $ sudo apt install initramfs-tools lz4 file
  $ mkinitramfs -c lz4 -o foo.img
  $ lsinitramfs foo.img
  cpio: premature end of archive

  [Regression Potential]

   * New lz4cat is more strict w.r.t. enforcing file name extensions,
  thus the fix is to feed a stream to lz4cat instead of asking it to
  open a file. The performance impact should be similar between both
  methods of reading file contents during ls/unmk-initramfs time.

  [Other Info]

  Original bug report:

  unmkinitramfs fails with lz4 compressed initrds

  Note:
  $ lz4cat -t unmkinitramfs_Cz6Yl9
  File extension doesn't match expected LZ4_EXTENSION (.lz4); will not process file: unmkinitramfs_Cz6Yl9

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