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.
diff -Nru initramfs-tools-0.133ubuntu6/unmkinitramfs
initramfs-tools-0.133ubuntu8/unmkinitramfs
--- initramfs-tools-0.133ubuntu6/unmkinitramfs 2019-06-07 19:22:58.000000000
+0000
+++ initramfs-tools-0.133ubuntu8/unmkinitramfs 2019-06-09 23:21:17.000000000
+0000
@@ -33,8 +33,8 @@
gzip -c -d "$archive"
elif xzcat -t "$archive" >/dev/null 2>&1 ; then
xzcat "$archive"
- elif lz4cat -t "$archive" >/dev/null 2>&1 ; then
- lz4cat "$archive"
+ elif lz4cat -t <"$archive" >/dev/null 2>&1 ; then
+ lz4cat <"$archive"
elif bzip2 -t "$archive" >/dev/null 2>&1 ; then
bzip2 -c -d "$archive"
elif lzop -t "$archive" >/dev/null 2>&1 ; then
