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scripts/image: use maximum lzo and zstd compression level for images

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For LZO, this saves about 40kb on img.gz size.

For GZIP, this saves about 4kb on img.gz size.

For ZSTD, this saves about 500kb on img.gz size.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
This commit is contained in:
Ian Leonard 2018-08-16 01:32:46 +00:00
parent 61a08eac1e
commit aecf28220e
1 changed files with 8 additions and 1 deletions
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9
scripts/image
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@ -231,9 +231,16 @@ rm -rf $TARGET_IMG/$IMAGE_NAME.kernel
cp -PR $BUILD/linux-$(kernel_version)/arch/$TARGET_KERNEL_ARCH/boot/$KERNEL_TARGET $TARGET_IMG/$IMAGE_NAME.kernel
chmod 0644 $TARGET_IMG/$IMAGE_NAME.kernel
# use strongest available compression level for images
if [ "$SQUASHFS_COMPRESSION" = "lzo" -o "${SQUASHFS_COMPRESSION:-gzip}" = "gzip" ]; then
SQUASHFS_COMPRESSION_OPTION="-Xcompression-level 9"
elif [ "$SQUASHFS_COMPRESSION" = "zstd" ]; then
SQUASHFS_COMPRESSION_OPTION="-Xcompression-level 22"
fi
# create squashfs file, default to gzip if no compression configured
echo "rm -rf \"$TARGET_IMG/$IMAGE_NAME.system\"" >> $FAKEROOT_SCRIPT
echo "$TOOLCHAIN/bin/mksquashfs \"$BUILD/image/system\" \"$TARGET_IMG/$IMAGE_NAME.system\" -noappend -comp ${SQUASHFS_COMPRESSION:-gzip}" >> $FAKEROOT_SCRIPT
echo "$TOOLCHAIN/bin/mksquashfs \"$BUILD/image/system\" \"$TARGET_IMG/$IMAGE_NAME.system\" -noappend -comp ${SQUASHFS_COMPRESSION:-gzip} ${SQUASHFS_COMPRESSION_OPTION}" >> $FAKEROOT_SCRIPT
# run fakeroot
$TOOLCHAIN/bin/fakeroot -- $FAKEROOT_SCRIPT