Bug#930366: initramfs-tools: unmkinitramfs fails to unpack lz4 compressed initrd

From	Dimitri John Ledkov <xnox@ubuntu.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#930366: initramfs-tools: unmkinitramfs fails to unpack lz4 compressed initrd
Date	2019-06-11 16:20 +0200
Message-ID	<y7PMZ-3e4-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Package: initramfs-tools
Version: 0.133
Severity: normal
Tags: patch

Dear Maintainer,

unmkinitramfs fails to unpack lz4 compressed initrd, ie.:

$ sudo apt install initramfs-tools lz4 file
$ mkinitramfs -c lz4 -o foo.img
$ unmkinitramfs foo.img bar
cpio: premature end of archive
$ echo $?
2

I think this is because lz4cat is strict with file extensions:

$ file foo.img 
foo.img: LZ4 compressed data (v0.1-v0.9)
$ lz4cat -t foo.img 
File extension doesn't match expected LZ4_EXTENSION (.lz4); will not process file: foo.img

I propose the attached patch to change 'lz4cat -t $archive'
invocations to become 'lz4cat -t <$archive' instead. As lz4cat does
not / cannot enforce extension checking on streams.

Regards,

Dimitri.

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Bug#930366: initramfs-tools: unmkinitramfs fails to unpack lz4 compressed initrd Dimitri John Ledkov <xnox@ubuntu.com> - 2019-06-11 16:20 +0200
  Bug#930366: marked as done (initramfs-tools: unmkinitramfs fails  to unpack lz4 compressed initrd) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-07-28 03:00 +0200
  Bug#930366: marked as done (initramfs-tools: unmkinitramfs fails  to unpack lz4 compressed initrd) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-08-23 10:10 +0200

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