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From 123feea1fab225478046db43454b10453df95b51 Mon Sep 17 00:00:00 2001 |
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From: P J P <ppandit@redhat.com> |
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Date: Fri, 11 Oct 2013 19:26:51 +0530 |
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Subject: [PATCH] Add lzo, lz4 compression and read INITRD_COMPRESS |
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This patch adds support for lzop(1) & lz4(1) compression |
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algorithms to compress iniramfs image file. Both are supported |
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by the Linux kernel. |
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Linux kernel exports user's choice of initramfs compression |
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algorithm as a shell environment variable: INITRD_COMPRESS. |
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This patch adds support to read this variable and duly compress |
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the initramfs image file. |
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Environment variable INITRD_COMPRESS has less precedence than the |
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command line options --gzip, etc. Ie. command line options could |
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override the compression algorithm defined by $INITRD_COMPRESS. |
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Signed-off-by: P J P <ppandit@redhat.com> |
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[Edited-by: Harald Hoyer: add documentation about lzo and lz4] |
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--- |
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dracut.8.asc | 16 ++++++++++++++++ |
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dracut.sh | 13 +++++++++++++ |
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2 files changed, 29 insertions(+) |
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diff --git a/dracut.8.asc b/dracut.8.asc |
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index 584514c0..2ea67447 100644 |
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--- a/dracut.8.asc |
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+++ b/dracut.8.asc |
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@@ -365,6 +365,22 @@ Make sure your kernel has xz decompression support compiled in, otherwise you |
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will not be able to boot. Equivalent to "lzma --compress=xz --check=crc32 --lzma2=dict=1MiB" |
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==== |
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+**--lzo**:: |
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+ Compress the generated initramfs using lzop. |
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+[WARNING] |
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+==== |
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+Make sure your kernel has lzo decompression support compiled in, otherwise you |
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+will not be able to boot. |
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+==== |
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+ |
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+**--lz4**:: |
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+ Compress the generated initramfs using lz4. |
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+[WARNING] |
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+==== |
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+Make sure your kernel has lz4 decompression support compiled in, otherwise you |
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+will not be able to boot. |
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+==== |
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+ |
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**--compress** _<compressor>_:: |
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Compress the generated initramfs using the passed compression program. If |
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you pass it just the name of a compression program, it will call that |
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diff --git a/dracut.sh b/dracut.sh |
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index d9533dd0..173a259a 100755 |
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--- a/dracut.sh |
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+++ b/dracut.sh |
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@@ -165,6 +165,12 @@ Creates initial ramdisk images for preloading modules |
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--xz Compress the generated initramfs using xz. |
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Make sure that your kernel has xz support compiled |
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in, otherwise you will not be able to boot. |
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+ --lzo Compress the generated initramfs using lzop. |
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+ Make sure that your kernel has lzo support compiled |
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+ in, otherwise you will not be able to boot. |
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+ --lz4 Compress the generated initramfs using lz4. |
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+ Make sure that your kernel has lz4 support compiled |
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+ in, otherwise you will not be able to boot. |
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--compress [COMPRESSION] Compress the generated initramfs with the |
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passed compression program. Make sure your kernel |
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knows how to decompress the generated initramfs, |
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@@ -342,6 +348,8 @@ TEMP=$(unset POSIXLY_CORRECT; getopt \ |
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--long bzip2 \ |
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--long lzma \ |
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--long xz \ |
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+ --long lzo \ |
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+ --long lz4 \ |
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--long no-compress \ |
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--long gzip \ |
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--long list-modules \ |
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@@ -430,6 +438,8 @@ while :; do |
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--bzip2) compress_l="bzip2";; |
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--lzma) compress_l="lzma";; |
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--xz) compress_l="xz";; |
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+ --lzo) compress_l="lzo";; |
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+ --lz4) compress_l="lz4";; |
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--no-compress) _no_compress_l="cat";; |
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--gzip) compress_l="gzip";; |
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--list-modules) do_list="yes";; |
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@@ -673,6 +683,7 @@ stdloglvl=$((stdloglvl + verbosity_mod_l)) |
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[[ $fw_dir ]] || fw_dir="/lib/firmware/updates /lib/firmware" |
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[[ $tmpdir_l ]] && tmpdir="$tmpdir_l" |
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[[ $tmpdir ]] || tmpdir=/var/tmp |
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+[[ $INITRD_COMPRESS ]] && compress=$INITRD_COMPRESS |
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[[ $compress_l ]] && compress=$compress_l |
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[[ $show_modules_l ]] && show_modules=$show_modules_l |
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[[ $nofscks_l ]] && nofscks="yes" |
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@@ -689,6 +700,8 @@ case $compress in |
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lzma) compress="lzma -9";; |
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xz) compress="xz --check=crc32 --lzma2=dict=1MiB";; |
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gzip) compress="gzip -9"; command -v pigz > /dev/null 2>&1 && compress="pigz -9";; |
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+ lzo) compress="lzop -9";; |
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+ lz4) compress="lz4 -9";; |
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esac |
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if [[ $_no_compress_l = "cat" ]]; then |
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compress="cat"
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