From 123feea1fab225478046db43454b10453df95b51 Mon Sep 17 00:00:00 2001 From: P J P Date: Fri, 11 Oct 2013 19:26:51 +0530 Subject: [PATCH] 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 $INITRD_COMPRESS. Signed-off-by: P J P [Edited-by: Harald Hoyer: add documentation about lzo and lz4] --- dracut.8.asc | 16 ++++++++++++++++ dracut.sh | 13 +++++++++++++ 2 files changed, 29 insertions(+) diff --git a/dracut.8.asc b/dracut.8.asc index 584514c..2ea6744 100644 --- a/dracut.8.asc +++ b/dracut.8.asc @@ -365,6 +365,22 @@ Make sure your kernel has xz decompression support compiled in, otherwise you will not be able to boot. Equivalent to "lzma --compress=xz --check=crc32 --lzma2=dict=1MiB" ==== +**--lzo**:: + Compress the generated initramfs using lzop. +[WARNING] +==== +Make sure your kernel has lzo decompression support compiled in, otherwise you +will not be able to boot. +==== + +**--lz4**:: + Compress the generated initramfs using lz4. +[WARNING] +==== +Make sure your kernel has lz4 decompression support compiled in, otherwise you +will not be able to boot. +==== + **--compress** __:: Compress the generated initramfs using the passed compression program. If you pass it just the name of a compression program, it will call that diff --git a/dracut.sh b/dracut.sh index d9533dd..173a259 100755 --- a/dracut.sh +++ b/dracut.sh @@ -165,6 +165,12 @@ Creates initial ramdisk images for preloading modules --xz Compress the generated initramfs using xz. Make sure that your kernel has xz support compiled in, otherwise you will not be able to boot. + --lzo Compress the generated initramfs using lzop. + Make sure that your kernel has lzo support compiled + in, otherwise you will not be able to boot. + --lz4 Compress the generated initramfs using lz4. + Make sure that your kernel has lz4 support compiled + in, otherwise you will not be able to boot. --compress [COMPRESSION] Compress the generated initramfs with the passed compression program. Make sure your kernel knows how to decompress the generated initramfs, @@ -342,6 +348,8 @@ TEMP=$(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"