setup-disk: add -m option for sepcifying install mode

So we dont need to ask.

Also fix help message.

setup-disk.in

@@ -645,9 +645,25 @@ reset_var() {
 	umount /var && 	rm -rf /var && mv /.var /var && rm -rf /var/lost+found
 }
 
+# set up /var on given device
+setup_var() {
+	local var_dev="$1"
+	local varfs=ext4
+	mkfs.$varfs -q $var_dev >/dev/null || return 1
+	sed -i -e '/[[:space:]]\/var[[:space:]]/d' /etc/fstab
+	echo -e "${var_dev}\t/var\t\t${varfs}\tdefaults 1 2" >> /etc/fstab
+
+	mv /var /.var
+	mkdir /var
+	mount /var
+	mv /.var/* /var/
+	rmdir /.var
+
+	/etc/init.d/syslog --quiet restart
+}
+
 data_only_disk_install() {
 	local diskdev=
-	local varfs=ext4
 	local vgname=vg0
 	local var_dev=/dev/$vgname/lv_var
 	local lvm_part_type="8e"
@@ -668,41 +684,14 @@ data_only_disk_install() {
 	done
 	
 	setup_lvm_volume_group $vgname $@ || return 1
-
 	setup_lvm_swap $vgname
-
 	lvcreate --quiet -n ${var_dev##*/} -l 100%FREE $vgname
-	mkfs.$varfs -q $var_dev >/dev/null || return 1
-	sed -i -e '/[[:space:]]\/var[[:space:]]/d' /etc/fstab
-	echo -e "${var_dev}\t/var\t\t${varfs}\tdefaults 1 2" >> /etc/fstab
-
-	mv /var /.var
-	mkdir /var
-	mount /var
-	mv /.var/* /var/
-	rmdir /.var
+	setup_var $var_dev
 
 	if [ -n "$USE_RAID" ]; then
 		mdadm --detail --scan > /etc/mdadm.conf
 		rc-update --quiet add mdadm-raid boot
 	fi
-	/etc/init.d/syslog --quiet restart
-}
-
-usage() {
-	cat <<__EOF__
-usage: setup-disk [-hr] [-k kernelflavor] [-o apkovl] [MOUNTPOINT]
-
-Install alpine on harddisk.
-
-options:
- -h  Show this help
- -o  Restore system from given apkovl file
- -k  Use kernelflavor instead of $KERNEL_FLAVOR
- -r  Enable software raid1 with single disk
-
-__EOF__
-	exit 1
 }
 
 diskselect_help() {
@@ -745,16 +734,45 @@ ask_disk() {
 	done
 }
 
+usage() {
+	cat <<__EOF__
+usage: setup-disk [-hqr] [-k kernelflavor] [-m MODE] [-o apkovl] [-s SWAPSIZE]
+		  [MOUNTPOINT | DISKDEV...]
+
+Install alpine on harddisk.
+
+If MOUNTPOINT is specified, then do a traditional disk install with MOUNTPOINT
+as root.
+
+If DISKDEV is specified, then use the specified disk(s) without asking. If
+multiple disks are specified then set them up in a RAID array. If there are
+mode than 2 disks, then use raid level 5 instead of raid level 1.
+
+options:
+ -h  Show this help
+ -m  Use disk for MODE without asking, where MODE is either 'data' or 'root'
+ -o  Restore system from given apkovl file
+ -k  Use kernelflavor instead of $KERNEL_FLAVOR
+ -q  Exit quietly if no disks are found
+ -r  Enable software raid1 with single disk
+ -s  Use SWAPSIZE MB instead of $SWAP_SIZE MB for swap (Use 0 to disable swap)
+ -v  Be more verbose about what is happening
+__EOF__
+	exit 1
+}
+
 KERNEL_FLAVOR=grsec
 case "$(uname -r)" in
 	*-vs[0-9]*) KERNEL_FLAVOR=vserver;;
 	*-pae) KERNEL_FLAVOR=pae;;
 esac
 
+DISK_MODE=
 SWAP_SIZE=$(find_swap_size)
 # Parse args
-while getopts "hk:Lo:qrs:v" opt; do
+while getopts "hk:Lm:o:qrs:v" opt; do
 	case $opt in
+		m) DISK_MODE="$OPTARG";;
 		k) KERNEL_FLAVOR="$OPTARG";;
 		L) USE_LVM=1;;
 		o) APKOVL="$OPTARG";;
@@ -810,8 +828,7 @@ else
 	fi
 fi
 
-diskmode=
-if [ -n "$diskdevs" ]; then
+if [ -n "$diskdevs" ] && [ -z "$DISK_MODE" ]; then
 	answer=
 	while true; do
 		echo "The following disks are selected:"
@@ -823,7 +840,7 @@ if [ -n "$diskdevs" ]; then
 		root|data) break;;
 		esac
 	done
-	diskmode="$answer"
+	DISK_MODE="$answer"
 fi
 
 set -- $diskdevs
@@ -834,8 +851,9 @@ fi
 dmesg -n1
 
 # native disk install
-case "$diskmode" in
+case "$DISK_MODE" in
 root) native_disk_install $diskdevs;;
 data) data_only_disk_install $diskdevs;;
+*) echo "Not a valid install mode: $DISK_MODE" >&2; exit 1;;
 esac