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initramfs: read CONFIG_RD_ variables for initramfs compression

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When expert configuration option(CONFIG_EXPERT) is enabled, menuconfig
offers a choice of compression algorithm to compress initial ramfs image;
This choice is stored into CONFIG_RD_* variables.  But usr/Makefile uses
earlier INITRAMFS_COMPRESSION_* macros to build initial ramfs file.  Since
none of them is defined, resulting 'initramfs_data.cpio' file remains
un-compressed.

This patch updates the Makefile to use CONFIG_RD_* variables and adds
support for LZ4 compression algorithm.  Also updates the
'gen_initramfs_list.sh' script to check whether a selected compression
command is accessible or not.  And fall-back to default gzip(1)
compression when it is not.

Signed-off-by: P J P <prasad@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
P J P 2013-11-12 15:10:22 -08:00 • committed by Linus Torvalds
parent ba24762bd5
commit 9ba4bcb645
2 changed files with 32 additions and 15 deletions
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24
scripts/gen_initramfs_list.sh
View file

@ -240,12 +240,24 @@ case "$arg" in
output_file="$1"
cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
output=${cpio_list}
echo "$output_file" | grep -q "\.gz$" && compr="gzip -n -9 -f"
echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
echo "$output_file" | grep -q "\.xz$" && \
compr="xz --check=crc32 --lzma2=dict=1MiB"
echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f"
echo "$output_file" | grep -q "\.gz$" \
&& [ -x "`which gzip 2> /dev/null`" ] \
&& compr="gzip -n -9 -f"
echo "$output_file" | grep -q "\.bz2$" \
&& [ -x "`which bzip2 2> /dev/null`" ] \
&& compr="bzip2 -9 -f"
echo "$output_file" | grep -q "\.lzma$" \
&& [ -x "`which lzma 2> /dev/null`" ] \
&& compr="lzma -9 -f"
echo "$output_file" | grep -q "\.xz$" \
&& [ -x "`which xz 2> /dev/null`" ] \
&& compr="xz --check=crc32 --lzma2=dict=1MiB"
echo "$output_file" | grep -q "\.lzo$" \
&& [ -x "`which lzop 2> /dev/null`" ] \
&& compr="lzop -9 -f"
echo "$output_file" | grep -q "\.lz4$" \
&& [ -x "`which lz4 2> /dev/null`" ] \
&& compr="lz4 -9 -f"
echo "$output_file" | grep -q "\.cpio$" && compr="cat"
shift
;;