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Update and slightly refactor compression handling. 

This adds a --compress= option along with xz support for 2.6.38 and above.
master
Victor Lowther 2011-03-19 10:48:19 -05:00 committed by Harald Hoyer
parent e5e5c8952d
commit 5e6c3b035d
2 changed files with 48 additions and 11 deletions
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34
dracut
View File

@ -96,6 +96,13 @@ Creates initial ramdisk images for preloading modules
--lzma Compress the generated initramfs using lzma.
Make sure your kernel has lzma support compiled in,
otherwise you will not be able to boot.
--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.
--compress [COMPRESSION] Compress the generated initramfs with the
passed compression program. Make sure your kernel
knows how to decompress the generated initramfs,
otherwise you will not be able to boot.
--no-compress Do not compress the generated initramfs. This will
override any other compression options.
--list-modules List all available dracut modules.
@ -195,6 +202,9 @@ while (($# > 0)); do
-c|--conf) read_arg conffile "$@" || shift;;
--confdir) read_arg confdir "$@" || shift;;
-L|--stdlog) read_arg stdloglvl_l "$@" || shift;;
-I|--install) read_arg install_items "$@" || shift;;
--fwdir) read_arg fw_dir_l "$@" || shift;;
--compress) read_arg compress "$@" || shift;;
-f|--force) force=yes;;
--kernel-only) kernel_only="yes"; no_kernel="no";;
--no-kernel) kernel_only="no"; no_kernel="yes";;
@ -212,14 +222,11 @@ while (($# > 0)); do
--fstab) use_fstab_l="yes" ;;
-h|--help) usage; exit 1 ;;
-i|--include) push include_src "$2"; push include_target "$3"; shift 2;;
--bzip2) [[ $compress != cat ]] && compress="bzip2 -9";;
--lzma) [[ $compress != cat ]] && compress="lzma -9";;
--xz) [[ $compress != cat ]] && compress="xz --check=crc32";;
--no-compress) compress="cat";;
--gzip) if [[ $compress != cat ]]; then
type pigz > /dev/null 2>&1 && compress="pigz -9" || \
compress="gzip -9"
fi;;
--bzip2) compress="bzip2";;
--lzma) compress="lzma";;
--xz) compress="xz";;
--no-compress) _no_compress="cat";;
--gzip) compress="gzip";;
--list-modules)
do_list="yes";
;;
@ -241,6 +248,17 @@ if ! [[ $kernel ]] || [[ $kernel = "unset" ]]; then
fi
[[ $outfile ]] || outfile="/boot/initramfs-$kernel.img"

case $compress in
bzip2) compress="bzip -9";;
lzma) compress="lzma -9";;
xz) compress="xz --check=crc32 --lzma2=dict=1MiB";;
gzip) type pigz > /dev/null 2>&1 && compress="pigz -9" || \
compress="gzip -9";;
esac
if [[ $_no_compress = "cat" ]]; then
compress="cat"
fi

PATH=/sbin:/bin:/usr/sbin:/usr/bin
export PATH


25
dracut.8.xml
View File

@ -353,7 +353,7 @@ TARGET directory in the final initramfs. If SOURCE is a file, it will be install
</term>
<listitem>
<para>Compress the generated initramfs using gzip.
This will be done by default, unless another compression option or --no-compress is passed.</para>
This will be done by default, unless another compression option or --no-compress is passed. Equivalent to "--compress=gzip -9"</para>
</listitem>
</varlistentry>
<varlistentry>
@ -363,7 +363,7 @@ TARGET directory in the final initramfs. If SOURCE is a file, it will be install
<listitem>
<para>Compress the generated initramfs using bzip2.
<warning>
<para>Make sure your kernel has bzip2 decompression support compiled in, otherwise you will not be able to boot.</para>
<para>Make sure your kernel has bzip2 decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=bzip2"</para>
</warning></para>
</listitem>
</varlistentry>
@ -374,10 +374,29 @@ TARGET directory in the final initramfs. If SOURCE is a file, it will be install
<listitem>
<para>Compress the generated initramfs using lzma.
<warning>
<para>Make sure your kernel has lzma decompression support compiled in, otherwise you will not be able to boot.</para>
<para>Make sure your kernel has lzma decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=lzma -9"</para>
</warning></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--xz</option>
</term>
<listitem>
<para>Compress the generated initramfs using xz.
<warning>
<para>Make sure your kernel has xz decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=xz --check=crc32 --lzma2=dict=1MiB"</para>
</warning></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--compress&nbsp;<replaceable>&lt;compressor&gt;</replaceable></option>
</term>
<listitem>
<para>Compress the generated initramfs using the passed compression program. If you pass it just the name of a compression program, it will call that program with known-working arguments. If you pass a quoted string with arguments, it will be called with exactly those arguments. Depending on what you pass, this may result in an initramfs that the kernel cannot decompress.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--no-compress</option>