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Add lzo, lz4 compression and read INITRD_COMPRESS 

This patch adds support for lzop(1) & lz4(1) compression
algorithms to compress iniramfs image file. Both are supported
by the Linux kernel.

Linux kernel exports user's choice of initramfs compression
algorithm as a shell environment variable: INITRD_COMPRESS.
This patch adds support to read this variable and duly compress
the initramfs image file.

Environment variable INITRD_COMPRESS has less precedence than the
command line options --gzip, etc. Ie. command line options could
override the compression algorithm defined by $INITRD_COMPRESS.

Signed-off-by: P J P <ppandit@redhat.com>

[Edited-by: Harald Hoyer: add documentation about lzo and lz4]
master
P J P 2013-10-11 19:26:51 +05:30 committed by Harald Hoyer
parent 1aedbb7886
commit 871c8e40d1
2 changed files with 29 additions and 0 deletions
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16
dracut.8.asc
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@ -365,6 +365,22 @@ Make sure your kernel has xz decompression support compiled in, otherwise you
will not be able to boot. Equivalent to "lzma --compress=xz --check=crc32 --lzma2=dict=1MiB"
====

**--lzo**::
Compress the generated initramfs using lzop.
[WARNING]
====
Make sure your kernel has lzo decompression support compiled in, otherwise you
will not be able to boot.
====

**--lz4**::
Compress the generated initramfs using lz4.
[WARNING]
====
Make sure your kernel has lz4 decompression support compiled in, otherwise you
will not be able to boot.
====

**--compress** _<compressor>_::
Compress the generated initramfs using the passed compression program. If
you pass it just the name of a compression program, it will call that

13
dracut.sh
View File

@ -165,6 +165,12 @@ Creates initial ramdisk images for preloading modules
--xz Compress the generated initramfs using xz.
Make sure that your kernel has xz support compiled
in, otherwise you will not be able to boot.
--lzo Compress the generated initramfs using lzop.
Make sure that your kernel has lzo support compiled
in, otherwise you will not be able to boot.
--lz4 Compress the generated initramfs using lz4.
Make sure that your kernel has lz4 support compiled
in, otherwise you will not be able to boot.
--compress [COMPRESSION] Compress the generated initramfs with the
passed compression program. Make sure your kernel
knows how to decompress the generated initramfs,
@ -342,6 +348,8 @@ TEMP=$(unset POSIXLY_CORRECT; getopt \
--long bzip2 \
--long lzma \
--long xz \
--long lzo \
--long lz4 \
--long no-compress \
--long gzip \
--long list-modules \
@ -430,6 +438,8 @@ while :; do
--bzip2) compress_l="bzip2";;
--lzma) compress_l="lzma";;
--xz) compress_l="xz";;
--lzo) compress_l="lzo";;
--lz4) compress_l="lz4";;
--no-compress) _no_compress_l="cat";;
--gzip) compress_l="gzip";;
--list-modules) do_list="yes";;
@ -673,6 +683,7 @@ stdloglvl=$((stdloglvl + verbosity_mod_l))
[[ $fw_dir ]] || fw_dir="/lib/firmware/updates /lib/firmware"
[[ $tmpdir_l ]] && tmpdir="$tmpdir_l"
[[ $tmpdir ]] || tmpdir=/var/tmp
[[ $INITRD_COMPRESS ]] && compress=$INITRD_COMPRESS
[[ $compress_l ]] && compress=$compress_l
[[ $show_modules_l ]] && show_modules=$show_modules_l
[[ $nofscks_l ]] && nofscks="yes"
@ -689,6 +700,8 @@ case $compress in
lzma) compress="lzma -9";;
xz) compress="xz --check=crc32 --lzma2=dict=1MiB";;
gzip) compress="gzip -9"; command -v pigz > /dev/null 2>&1 && compress="pigz -9";;
lzo) compress="lzop -9";;
lz4) compress="lz4 -9";;
esac
if [[ $_no_compress_l = "cat" ]]; then
compress="cat"