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mkinitfs: add xz compression support

--- a/mkinitfs.in

+++ b/mkinitfs.in

@@ -12,6 +12,8 @@

 startdir=$PWD

+initfscomp=gzip

+

 feature_files() {

 	local dir="$1"

 	local suffix="$2"

@@ -147,16 +149,26 @@

 	fi

 	rm -f $outfile

 	umask 0022

-	(cd "$tmpdir" && find . | sort | cpio --quiet -o -H newc | gzip -9) > $outfile

+	(cd "$tmpdir" && find . | sort | cpio --quiet -o -H newc | $comp) > $outfile

 }

+cmd_exists() {

+	local cmd="$1"

+	if ! command -v "$cmd" >/dev/null 2>&1; then

+		echo "Command \"$cmd\" is not available."

+		exit 1

+	fi

+}

+

 usage() {

 	cat <<EOF

 usage: mkinitfs [-hkKLln] [-b basedir] [-c configfile] [-F features] [-f fstab]

-		[-i initfile ] [-o outfile] [-P featuresdir] [-t tempdir] [kernelversion]"

+		[-C initramfs compression] [-i initfile] [-o outfile]

+		[-P featuresdir] [-t tempdir] [kernelversion]

 options:

 	-b  prefix files and kernel modules with basedir

 	-c  use configfile instead of $config

+	-C  initramfs compression (gzip|xz defaults to $initfscomp)

 	-f  use fstab instead of $fstab

 	-F  use specified features

 	-h  print this help

@@ -178,10 +190,11 @@

 # main

 features_dirs=${features_dir:-"${basedir%/:-}/${sysconfdir#/}/features.d"}

-while getopts "b:c:f:F:hi:kKLlno:P:qt:" opt; do

+while getopts "b:c:C:f:F:hi:kKLlno:P:qt:" opt; do

 	case "$opt" in

 		b) basedir="$OPTARG";;

 		c) config="$OPTARG";;

+		C) initfscomp="$OPTARG";;

 		F) myfeatures="$OPTARG";;

 		f) fstab="$OPTARG";;

 		h) usage;;

@@ -256,6 +269,12 @@

 if [ -z "$list_sources" ] && [ -z "$quiet" ]; then

 	echo "==> initramfs: creating $outfile"

 fi

+

+case "$initfscomp" in

+	gzip) comp="gzip -9" ;;

+	xz) cmd_exists xz; comp="xz -C crc32 -T 0" ;;

+	*) echo "Initramfs compression \"$initfscomp\" not supported!"; exit 1 ;;

+esac

 initfs_base \

 	&& initfs_kmods \