106 lines
4.1 KiB
Diff
106 lines
4.1 KiB
Diff
From 871c8e40d1c7bb1bace48ce19ea1b956f7065458 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 584514c..2ea6744 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 d9533dd..173a259 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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