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

[Dimitri John Ledkov]

Testing on cm3

switch to partitions #0, OK
mmc0(part 0) is current device
LOADBOOTENV
** Unable to read file uEnv.txt **
Running uenvcmd ...
ENVCMD
6644040 bytes read in 282 ms (22.5 MiB/s) (this is kernel)
2852487 bytes read in 123 ms (22.1 MiB/s) (this is initrd)
FAT: Misaligned buffer address (023b8687)
42049 bytes read in 14 ms (2.9 MiB/s)

2019-07-04T15:35:05.998027+0000 localhost kernel: Unpacking initramfs...
2019-07-04T15:35:05.998089+0000 localhost kernel: Freeing initrd memory: 2828K

(not sure if above is true gzip decompression speed of initramfs or not)

Watching telnet, from reboot until "Press enter to configure" took
41.84s (42.25s 41.50s).

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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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