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

[Dimitri John Ledkov]

** Bug watch added: Debian Bug tracker #930366
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930366

** Also affects: initramfs-tools (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930366
   Importance: Unknown
       Status: Unknown

** Description changed:

+ [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
- 
- 
- And
- 
- $ lsinitramfs /boot/initrd.img
- kernel
- kernel/x86
- kernel/x86/microcode
- kernel/x86/microcode/.enuineIntel.align.0123456789abc
- kernel/x86/microcode/GenuineIntel.bin
- cpio: premature end of archive

** Changed in: initramfs-tools (Ubuntu Cosmic)
       Status: Confirmed => In Progress

** Changed in: initramfs-tools (Ubuntu Disco)
       Status: Confirmed => In Progress

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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 Bionic:
  Invalid
Status in initramfs-tools source package in Cosmic:
  In Progress
Status in initramfs-tools source package in Disco:
  In Progress
Status in initramfs-tools package in Debian:
  Unknown

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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