setup-disk.in 21.7 KB
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#!/bin/sh

PREFIX=
. "$PREFIX/lib/libalpine.sh"

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MBR=${MBR:-"/usr/share/syslinux/mbr.bin"}
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ROOTFS=${ROOTFS:-ext4}
BOOTFS=${BOOTFS:-ext4}
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in_list() {
	local i="$1"
	shift
	while [ $# -gt 0 ]; do
		[ "$i" = "$1" ] && return 0
		shift
	done
	return 1
}

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all_in_list() {
	local needle="$1"
	local i
	[ -z "$needle" ] && return 1
	shift
	for i in $needle; do
		in_list "$i" $@ || return 1
	done
	return 0
}

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# wrapper to only show given device
_blkid() {
	blkid | grep "^$1:"
}

# if given device have an UUID display it, otherwise return the device
uuid_or_device() {
	local i=
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	case "$1" in
		/dev/md*) echo "$1" && return 0;;
	esac
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	for i in $(_blkid "$1"); do
		case "$i" in
			UUID=*) eval $i;;
		esac
	done
	if [ -n "$UUID" ]; then
		echo "UUID=$UUID"
	else
		echo "$1"
	fi
}

# generate an fstab from a given mountpoint. Convert to UUID if possible
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enumerate_fstab() {
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	local mnt="$1"
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	local fs_spec= fs_file= fs_vfstype= fs_mntops= fs_freq= fs_passno=
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	[ -z "$mnt" ] && return
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	local escaped_mnt=$(echo $mnt | sed 's:/:\\/:g')
	awk "\$2 ~ /^$escaped_mnt/ {print \$0}" /proc/mounts | \
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		sed "s:$mnt:/:g; s: :\t:g" | sed 's:/\+:/:g' | \
		while read fs_spec fs_file fs_vfstype fs_mntops fs_freq fs_passno; do
			echo -e "$(uuid_or_device $fs_spec)\t${fs_file}\t${fs_vfstype}\t${fs_mntops} ${fs_freq} ${fs_passno}"
		done
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}

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is_vmware() {
	grep -q VMware /proc/scsi/scsi 2>/dev/null \
		|| grep -q VMware /proc/ide/hd*/model 2>/dev/null
}

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is_xen() {
	[ -d /proc/xen ]
}

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# return true (0) if given device is lvm
is_lvm() {
	lvs "$1" >/dev/null 2>&1
}

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# Find the disk device from given partition
disk_from_part() {
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	# we need convert cciss/c0d0* cciss!c0d0*...
	local i= part=$(echo ${1#/dev/} | sed 's:/:!:g')
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	for i in /sys/block/*/$part; do
		i=${i%/*}
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		# ...and back from cciss!c0d0 to cciss/c0d0
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		if [ -b "/dev/${i##*/}" ]; then
			echo "/dev/${i##*/}" | sed 's:!:/:g'
			return 0
		fi
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	done
	return 1
}

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unpack_apkovl() {
	local ovl="$1"
	local dest="$2"
	local suffix=${ovl##*.}
	local i
	ovlfiles=/tmp/ovlfiles
	if [ "$suffix" = "gz" ]; then
		if ! tar -C "$dest" --numeric-owner -zxvf "$ovl" > $ovlfiles; then
			echo -n "Continue anyway? [Y/n]: "
			read i
			case "$i" in
				n*|N*) return 1;;
			esac
		fi
		return 0 
	fi

	apk add -q openssl

	if ! openssl list-cipher-commands | grep "^$suffix$" > /dev/null; then
		errstr="Cipher $suffix is not supported"
		return 1
	fi
	local count=0
	# beep
	echo -e "\007"
	while [ $count -lt 3 ]; do
		openssl enc -d -$suffix -in "$ovl" | tar --numeric-owner \
			-C "$dest" -zxv >$ovlfiles 2>/dev/null && return 0
		count=$(( $count + 1 ))
	done
	ovlfiles=
	return 1
}

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# find filesystem of given mounted dir
find_mount_fs() {
	local mount_point="$1"
	awk "\$2 == \"$mount_point\" {print \$3}" /proc/mounts | tail -n 1
}

# find device for given mounted dir
find_mount_dev() {
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	local mnt="$1"
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	awk "\$2 == \"$mnt\" { print \$1 }" /proc/mounts | tail -n 1
}

supported_boot_fs() {
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	local supported="ext2 ext3 ext4 btrfs"
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	local fs=
	for fs in $supported; do
		[ "$fs" = "$1" ] && return 0
	done
	echo "$1 is not supported. Only supported are: $supported" >&2
	return 1
}

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find_volume_group() {
	local lv=${1##*/}
	lvs --noheadings "$1" | awk "\$1 == \"$lv\" {print \$2}"
}

find_pvs_in_vg() {
	local vg="$1"
	pvs --noheadings | awk "\$2 == \"$vg\" {print \$1}"
}

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install_mounted_root() {
	local mnt="$1" mnt_boot="$1" boot_fs= root_fs=
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	local initfs_features="ata base ide scsi usb virtio"
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	local pvs= dev= rootdev= bootdev= raidopt= root= modules=
	local kernel_opts="quiet"
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	rootdev=$(find_mount_dev "$mnt")
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	if [ -z "$rootdev" ]; then
		echo "$mnt does not seem to be a mount point" >&2
		return 1
	fi
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	root_fs=$(find_mount_fs "$mnt")
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	initfs_features="$initfs_features $root_fs"

	if is_lvm "$rootdev"; then
		initfs_features="$initfs_features lvm"
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		local vg=$(find_volume_group "$rootdev")
		pvs=$(find_pvs_in_vg $vg)
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	fi

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	bootdev=$(find_mount_dev "$mnt"/boot)
	if [ -z "$bootdev" ]; then
		bootdev=$rootdev
	else
		mnt_boot="$mnt"/boot
		bootdev=$(find_mount_dev "$mnt_boot")
	fi
	boot_fs=$(find_mount_fs "$mnt_boot")
	supported_boot_fs "$boot_fs" || return 1

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	if [ -e "/sys/block/${bootdev#/dev/}/md" ]; then
		raidopt="--raid"
	fi
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	for dev in $rootdev $pvs; do
		[ -e "/sys/block/${dev#/dev/}/md" ] || continue

		local md=${dev#/dev/}
		initfs_features="$(echo $initfs_features | sed 's/raid//') raid"
		local level=$(cat /sys/block/$md/md/level)
		case "$level" in
			raid1) raidmod="$raidmod,$level";;
			raid[456]) raidmod="$raidmod,raid456";;
		esac
	done
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	if [ -n "$VERBOSE" ]; then
		echo "Root device:     $rootdev"
		echo "Root filesystem: $root_fs"
		echo "Boot device:     $bootdev"
		echo "Boot filesystem: $boot_fs"
	fi
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	if [ -z "$APKOVL" ]; then
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		ovlfiles=/tmp/ovlfiles
		lbu package - | tar -C "$mnt" -zxv > "$ovlfiles"
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	else
		echo "Restoring backup from $APKOVL to $rootdev..."
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		unpack_apkovl "$APKOVL" "$mnt" || return 1
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	fi
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	# generate mkinitfs.conf
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	mkdir -p "$mnt"/etc/mkinitfs/files.d
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	echo "features=\"$initfs_features\"" > "$mnt"/etc/mkinitfs/mkinitfs.conf
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	if [ -n "$raidmod" ]; then
		echo "/sbin/mdadm" > "$mnt"/etc/mkinitfs/files.d/raid
		echo "/etc/mdadm.conf" >> "$mnt"/etc/mkinitfs/files.d/raid
	fi
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	# generate update-extlinux.conf
	root=$(uuid_or_device $rootdev)
	if is_vmware; then
		kernel_opts="pax_nouderef $kernel_opts"
	fi
	if is_xen; then
		kernel_opts="xen $kernel_opts"
	fi
	modules="sd-mod,usb-storage,${root_fs}${raidmod}"
	sed -e "s:^root=.*:root=$root:" \
		-e "s:^default_kernel_opts=.*:default_kernel_opts=\"$kernel_opts\":" \
		-e "s:^modules=.*:modules=$modules:" \
		/etc/update-extlinux.conf > "$mnt"/etc/update-extlinux.conf


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	# generate the fstab
	if [ -f "$mnt"/etc/fstab ]; then
		mv "$mnt"/etc/fstab "$mnt"/etc/fstab.old
	fi
	enumerate_fstab "$mnt" >> "$mnt"/etc/fstab
	cat >>"$mnt"/etc/fstab <<EOF
/dev/cdrom	/media/cdrom	iso9660	noauto,ro 0 0
/dev/fd0	/media/floppy	vfat	noauto	0 0
/dev/usbdisk	/media/usb	vfat	noauto	0 0
EOF

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	# remove the installed db in case its there so we force re-install
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	rm -f "$mnt"/var/lib/apk/installed "$mnt"/lib/apk/db/installed
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	echo "Installing system on $rootdev:"
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	# apk reads config from target root so we need to copy the config
	mkdir -p "$mnt"/etc/apk/keys/
	cp /etc/apk/keys/* "$mnt"/etc/apk/keys/

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	local apkflags="--initdb --quiet --progress --update-cache --clean-protected"
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	local pkgs=$(cat "$mnt"/etc/apk/world "$mnt"/var/lib/apk/world 2>/dev/null)
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	pkgs="$pkgs acct linux-$KERNEL_FLAVOR alpine-base"
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	local repos=$(sed -e 's/\#.*//' /etc/apk/repositories)
	local repoflags=
	for i in $repos; do
		repoflags="$repoflags --repository $i"
	done
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	apk add --root "$mnt" $apkflags --overlay-from-stdin \
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		$repoflags $pkgs <$ovlfiles>/dev/null || return 1
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	echo ""
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	is_xen || extlinux $raidopt --install "$mnt"/boot
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}

unmount_partitions() {
	local mnt="$1"
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	# unmount the partitions
	umount $(awk '{print $2}' /proc/mounts | grep ^"$mnt" | sort -r)
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}
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# figure out decent default swap size in mega bytes
find_swap_size() {
	local memtotal_kb=$(awk '$1 == "MemTotal:" {print $2}' /proc/meminfo)
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	# use 2 * avaiable ram or no more than 1/3 of smallest disk space
	local size=$(( $memtotal_kb * 2 / 1024 ))
	local disk= disksize=
	for disk in $@; do
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		local sysfsdev=$(echo ${disk#/dev/} | sed 's:/:!:g')
		local sysfspath=/sys/block/$sysfsdev/size
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		# disksize = x * 512 / (1024 * 1024) = x / 2048
		# maxsize = $disksize / 4 = x / (2048 * 4) = x / 8192
		maxsize=$(awk '{ printf "%i", $0 / 8192 }' $sysfspath )
		if [ $size -gt $maxsize ]; then
			size=$maxsize
		fi
	done
	if [ $size -gt 4096 ]; then
		# dont ever use more than 4G
		size=4096
	elif [ $size -lt 64 ]; then
		# dont bother create swap smaller than 64MB
		size=0
	fi
	echo $size
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}

has_mounted_part() {
	local p
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	local sysfsdev=$(echo ${1#/dev/} | sed 's:/:!:g')
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	# parse /proc/mounts for mounted devices
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	for p in $(awk '$1 ~ /^\/dev\// {gsub("/dev/", "", $1); gsub("/", "!", $1); print $1}' \
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			/proc/mounts); do
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		[ "$p" = "$sysfsdev" ] && return 0
		[ -e /sys/block/$sysfsdev/$p ] && return 0
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	done
	return 1
}

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has_holders() {
	local i
	# check if device is used by any md devices
	for i in $1/holders/* $1/*/holders/*; do
		[ -e "$i" ] && return 0
	done
	return 1
}

is_available_disk() {
	local dev=$1
	local b=$(echo $p | sed 's:/:!:g')

	# check if its a "root" block device and not a partition
	[ -e /sys/block/$b ] || return 1
	
	# check so it does not have mounted partitions
	has_mounted_part $dev && return 1

	# check so its not part of an md setup
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	if has_holders /sys/block/$b; then
		[ -n "$USE_RAID" ] && echo "Warning: $dev is part of a running raid" >&2
		return 1
	fi
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	# check so its not an md device
	[ -e /sys/block/$b/md ] && return 1

	return 0
}

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find_disks() {
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	local p=
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	for p in $(awk '$1 ~ /[0-9]+/ {print $4}' /proc/partitions); do
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		is_available_disk $p && echo -n " $p"
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	done
}

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stop_all_raid() {
	local rd
	for rd in /dev/md*; do
		[ -b $rd ] && mdadm --stop $rd
	done
}

# install needed programs
init_progs() {
	local raidpkg=
	[ -n "$USE_RAID" ] && raidpkg="mdadm"
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	apk add -q sfdisk e2fsprogs lvm2 $raidpkg syslinux $@
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}

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show_disk_info() {
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	local disk= vendor= model= d= size=
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	for disk in $@; do
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		local dev=${disk#/dev/}
		d=$(echo $dev | sed 's:/:!:g')
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		vendor=$(cat /sys/block/$d/device/vendor 2>/dev/null)
		model=$(cat /sys/block/$d/device/model 2>/dev/null)
		size=$(awk '{gb = ($1 * 512)/1000000000; printf "%.1f GB\n", gb}' /sys/block/$d/size 2>/dev/null)
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		echo "  $dev	($size $vendor $model)"
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	done
}
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confirm_erase() {
	local answer=
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	echo "WARNING: The following disk(s) will be erased:"
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	show_disk_info $@
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	echo -n "WARNING: Erase the above disk(s) and continue? [y/N]: "
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	read answer
	case "$answer" in
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		y*|Y*) return 0;;
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	esac
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	return 1
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}

# setup disk dev in $1 for LVM usage.
# usage: setup_partitions <diskdev> size1,type1 [size2,type2 ...] 
setup_partitions() {
	local diskdev="$1"
	shift

	echo "Initializing partitions on $diskdev..."
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	# new disks does not have an DOS signature in sector 0
	# this makes sfdisk complain. We can workaround this by letting
	# fdisk create that DOS signature, by just do a "w", a write.
	# http://bugs.alpinelinux.org/issues/show/145
	echo "w" | fdisk $diskdev >/dev/null

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	# fix the MBR while here so extlinux can boot
	cat "$MBR" > $diskdev

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	local start=0
	local line=
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	# create new partitions
	(
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		for line in "$@"; do
			echo "$start,$line"
			start=
		done
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	) | sfdisk -q -L -uM $diskdev >>/tmp/sfdisk.out || return 1

	# create device nodes if not exist
	mdev -s
}

# find the bootable partition on given disk
find_boot_partition() {
	sfdisk -d $1 | awk '/bootable/ {print $1}'
}

# find the partition(s) for LVM
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# this is not marked as bootable and is type 8e
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find_lvm_partition() {
	local type=8e
	sfdisk -d $1 | grep -v bootable | awk "/Id=$type/ {print \$1}"
}

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# set up boot device. We only use raid1 for boot devices if any raid
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setup_boot_dev() {
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	local disk= bootdev=
	local part=$(for disk in $@; do find_boot_partition $disk; done)
	set -- $part
	bootdev=$1
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	[ -z "$bootdev" ] && return 1
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	echo "Creating file systems..."
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	if [ -n "$USE_RAID" ]; then
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		local missing=
		local num=$#
		if [ $# -eq 1 ]; then
			missing="missing"
			num=2
		fi
		mdadm --create /dev/md0 --level=1 --raid-devices=$num \
			--metadata=0.90 --quiet --run $@ $missing || return 1
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		bootdev=/dev/md0
	fi
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	mkfs.$BOOTFS -q $bootdev
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	BOOT_DEV="$bootdev"
}

# $1 = index
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# $2 = partition type
# $3... = disk devices
find_nth_non_boot_parts() {
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	local idx=$1
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	local id=$2
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	local disk=
	shift
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	shift
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	for disk in $@; do
		sfdisk -d $disk | grep -v bootable \
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			| awk "/Id=$id/ { i++; if (i==$idx) print \$1 }"
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	done
}

setup_non_boot_raid_dev() {
	local md_dev=$1
	local idx=${md_dev#/dev/md}
	shift
	local level=1
	local numdevs=$#
	local missing=
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	local raid_parts=$(find_nth_non_boot_parts $idx "fd" $@)
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	set -- $raid_parts
	# how many disks do we have?
	case $# in
		0) echo "No Raid partitions found" >&2; return 1;;
		1) level=1; missing="missing"; num=2;;
		2) level=1; missing=  ; num=2;;
		*) level=5; missing=  ; num=$#;;
	esac
	mdadm --create /dev/md$idx --level=$level --raid-devices=$num \
		--quiet --run $@ $missing || return 1
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}

# setup device for lvm, create raid array if needed
setup_lvm_volume_group() {
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	local vgname="$1"
	shift
	local lvmdev=
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	if [ -n "$USE_RAID" ]; then
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		setup_non_boot_raid_dev /dev/md1 $@ || return 1
		lvmdev=/dev/md1
	else	
		lvmdev=$(find_lvm_partition $1)
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	fi

	# be quiet on success
	local errmsg=$(dd if=/dev/zero of=$lvmdev bs=1k count=1 2>&1) \
		|| echo "$errmsg"
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	pvcreate --quiet $lvmdev \
		&& vgcreate --quiet $vgname $lvmdev >/dev/null
}

# set up swap on given device(s)
setup_swap_dev() {
	local swap_dev=
	sed -i -e '/swap/d' /etc/fstab
	for swap_dev in "$@"; do
		mkswap $swap_dev >/dev/null
		echo -e "$swap_dev\tswap\t\tswap\tdefaults 0 0" >> /etc/fstab
	done
	swapon -a
	rc-update --quiet add swap boot
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}

# setup and enable swap on given volumegroup if needed
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setup_lvm_swap() {
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	local vgname="$1"
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	local swapname=lv_swap
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	if [ -z "$SWAP_SIZE" ] || [ "$SWAP_SIZE" -eq 0 ]; then
		return
	fi
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	lvcreate --quiet -n $swapname -L ${SWAP_SIZE}MB $vgname
	setup_swap_dev /dev/$vgname/$swapname
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}

# if /var is mounted, move out data and umount it
reset_var() {
	[ -z "$(find_mount_dev /var)" ] && return 0
	mkdir /.var
	mv /var/* /.var/ 2>/dev/null
	umount /var && 	rm -rf /var && mv /.var /var && rm -rf /var/lost+found
}

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# set up /var on given device
setup_var() {
	local var_dev="$1"
	local varfs=ext4
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	echo "Creating file systems..."
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	mkfs.$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
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	setup_mdadm_conf
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}

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setup_mdadm_conf() {
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	local mods= mod=
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	if [ -n "$USE_RAID" ]; then
		mdadm --detail --scan > /etc/mdadm.conf
		rc-update --quiet add mdadm-raid boot
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		mods=$(awk '/^raid/ {print $1}' /proc/modules)
		for mod in $mods; do
			if ! grep -q "^$mod" /etc/modules; then
				echo $mod >> /etc/modules
			fi
		done
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	fi
}

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data_only_disk_install_lvm() {
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	local diskdev=
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	local vgname=vg0
	local var_dev=/dev/$vgname/lv_var
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	local lvm_part_type="8e"
	local raid_part_type="fd"
	local part_type=$lvm_part_type
	local size=
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	init_progs || return 1
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	confirm_erase $@ || return 1
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	if [ "$USE_RAID" ]; then
		part_type=$raid_part_type
		stop_all_raid
	fi
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	for diskdev in "$@"; do
		setup_partitions $diskdev "$size,$part_type" || return 1
	done
	
	setup_lvm_volume_group $vgname $@ || return 1
	setup_lvm_swap $vgname
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	lvcreate --quiet -n ${var_dev##*/} -l 100%FREE $vgname
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	setup_mdadm_conf
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	rc-update add lvm boot
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	setup_var $var_dev
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}

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data_only_disk_install() {
	local diskdev=
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	local var_dev=
	local var_part_type="83"
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	local swap_part_type=82
	local size=
	local swap_dev= var_dev=

	init_progs || return 1
	confirm_erase $@ || return 1

	if [ "$USE_RAID" ]; then
		var_part_type="fd"
		swap_part_type="fd"
		stop_all_raid
	fi

	for diskdev in "$@"; do
		setup_partitions $diskdev \
			"$SWAP_SIZE,$swap_part_type" \
			"$size,$var_part_type" || return 1
	done

	if [ "$USE_RAID" ]; then
		[ $SWAP_SIZE -gt 0 ] && setup_non_boot_raid_dev /dev/md1 $@
		setup_non_boot_raid_dev /dev/md2 $@ || return 1
		swap_dev=/dev/md1
		var_dev=/dev/md2
	else
		swap_dev=$(find_nth_non_boot_parts 1 82 $@)
		var_dev=$(find_nth_non_boot_parts 1 83 $@)
	fi
	[ $SWAP_SIZE -gt 0 ] && setup_swap_dev $swap_dev
	setup_var $var_dev
}

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# setup 
setup_root() {
	local root_dev="$1" boot_dev="$2"
	mkfs.$ROOTFS -q "$root_dev"
	mkdir -p /mnt
	mount -t $ROOTFS $root_dev /mnt || return 1
	if [ -n "$boot_dev" ]; then
		mkdir -p /mnt/boot
		mount -t $BOOTFS $boot_dev /mnt/boot || return 1
	fi

	setup_mdadm_conf
	install_mounted_root /mnt || return 1
	unmount_partitions /mnt
	swapoff -a

	echo ""
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	echo "Installation is complete. Please reboot."
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}

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native_disk_install_lvm() {
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	local diskdev= vgname=vg0
	local lvm_part_type="8e"
	local raid_part_type="fd"
	local boot_part_type="83"
	local boot_size=${BOOT_SIZE:-100}
	local lvm_size=
	local root_dev=/dev/$vgname/lv_root

	init_progs syslinux || return 1
	confirm_erase $@ || return 1
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	if [ -n "$USE_RAID" ]; then
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		boot_part_type="fd"
		lvm_part_type="fd"
		stop_all_raid
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	fi
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	for diskdev in "$@"; do
		setup_partitions $diskdev \
			"$boot_size,$boot_part_type,*" \
			"$lvm_size,$lvm_part_type" || return 1
	done

	# will find BOOT_DEV for us
	setup_boot_dev $@

	setup_lvm_volume_group $vgname $@ || return 1
	setup_lvm_swap $vgname
	lvcreate --quiet -n ${root_dev##*/} -l 100%FREE $vgname
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	rc-update add lvm boot
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	setup_root $root_dev $BOOT_DEV
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}

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native_disk_install() {
	local root_part_type="83" swap_part_type="82" boot_part_type="83"
	local boot_size=${BOOT_SIZE:-100}
	local swap_size=${SWAP_SIZE}
	local root_size=
	local root_dev= boot_dev= swap_dev=

	init_progs syslinux || return 1
	confirm_erase $@ || return 1

	if [ -n "$USE_RAID" ]; then
		boot_part_type="fd"
		root_part_type="fd"
		swap_part_type="fd"
		stop_all_raid
	fi
	for diskdev in "$@"; do
		setup_partitions $diskdev \
			"$boot_size,$boot_part_type,*" \
			"$swap_size,$swap_part_type" \
			"$root_size,$root_part_type" \
			|| return 1
	done

	# will find BOOT_DEV for us
	setup_boot_dev $@
	
	if [ "$USE_RAID" ]; then
		[ $SWAP_SIZE -gt 0 ] && setup_non_boot_raid_dev /dev/md1 $@
		setup_non_boot_raid_dev /dev/md2 $@ || return 1
		swap_dev=/dev/md1
		root_dev=/dev/md2
	else
		swap_dev=$(find_nth_non_boot_parts 1 82 $@)
		root_dev=$(find_nth_non_boot_parts 1 83 $@)
	fi
	[ $SWAP_SIZE -gt 0 ] && setup_swap_dev $swap_dev
	setup_root $root_dev $BOOT_DEV
}

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diskselect_help() {
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	cat <<__EOF__

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The disk you select can be used for a traditional disk install or for a
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data-only install.

The disk will be erased.

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Enter 'none' if you want to run diskless.
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__EOF__
}

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diskmode_help() {
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	cat <<__EOF__

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You can select between 'sys' or 'data'.
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sys:
  This mode is a traditional disk install. The following partitions will be
  created on the disk: /boot, / (filesystem root) and swap.
    
  This mode may be used for development boxes, desktops, virtual servers, etc.
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data:
  This mode uses your disk(s) for data storage, not for the operating system.
  The system itself will run from tmpfs (RAM).
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  Use this mode if you only want to use the disk(s) for a mailspool, databases,
  logs, etc.
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__EOF__
}

# ask for a root or data disk
# returns answer in global variable $answer
ask_disk() {
	local prompt="$1"
	local help_func="$2"
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	local i=
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	shift 2
	answer=
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	local default_disk=${DEFAULT_DISK:-$1}
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	while ! all_in_list "$answer" $@ "none" "abort"; do
		echo "Available disks are:"
		show_disk_info "$@"
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		echon "$prompt [$default_disk] "
		default_read answer $default_disk
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		case "$answer" in
			'abort') exit 0;;
			'none') return 0;;
			'?') $help_func;;
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			*) for i in $answer; do
				if ! [ -b "/dev/$i" ]; then
					echo "/dev/$i is not a block device" >&2
					answer=
				   fi
			done;;
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		esac
	done
}

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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
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 -L  Use LVM to manage partitions
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 -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
}

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KERNEL_FLAVOR=grsec
case "$(uname -r)" in
	*-vs[0-9]*) KERNEL_FLAVOR=vserver;;
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	*-pae) KERNEL_FLAVOR=pae;;
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esac

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DISK_MODE=
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USE_LVM=
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# Parse args
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while getopts "hk:Lm:o:qrs:v" opt; do
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	case $opt in
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		m) DISK_MODE="$OPTARG";;
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		k) KERNEL_FLAVOR="$OPTARG";;
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		L) USE_LVM="_lvm";;
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		o) APKOVL="$OPTARG";;
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		q) QUIET=1;;
		r) USE_RAID=1;;
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		s) SWAP_SIZE="$OPTARG";;
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		v) VERBOSE=1;;
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		*) usage;;
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	esac
done
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shift $(( $OPTIND - 1))
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if [ -d "$1" ]; then
	# install to given mounted root
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	apk add -q syslinux
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	install_mounted_root "${1%/}"
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	exit $?
fi

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reset_var
swapoff -a

# stop all volume groups in use
vgchange --ignorelockingfailure -a n >/dev/null 2>&1

if [ -n "$USE_RAID" ]; then
	stop_all_raid
fi

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disks=$(find_disks)
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diskdevs=
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# no disks so lets exit quietly.
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if [ -z "$disks" ]; then
	[ -z "$QUIET" ] && echo "No disks found." >&2
	exit 0
fi
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if [ $# -gt 0 ]; then
	# check that they are 
	for i in "$@"; do
		j=$(readlink -f "$i" | sed 's:^/dev/::; s:/:!:g')
		if ! [ -e "/sys/block/$j/device" ]; then
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			echo "$i is not a suitable for partitioning"
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			exit 1
		fi
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		diskdevs="$diskdevs /dev/$j"
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	done
else
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	ask_disk "Which disk(s) would you like to use? (or '?' for help or 'none')" \
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		diskselect_help $disks
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	if [ "$answer" != none ]; then
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		for i in $answer; do
			diskdevs="$diskdevs /dev/$i"
		done
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	else
		DISK_MODE="none"
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	fi
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fi
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if [ -n "$diskdevs" ] && [ -z "$DISK_MODE" ]; then
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	answer=
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	disk_is_or_disks_are="disk is"
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	it_them="it"
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	set -- $diskdevs
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	if [ $# -gt 1 ]; then
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		disk_is_or_disks_are="disks are"
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		it_them="them"
	fi
		
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	while true; do
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		echo "The following $disk_is_or_disks_are selected:"
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		show_disk_info $diskdevs
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		echon "How would you like to use $it_them? ('sys', 'data' or '?' for help) [?] "
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		default_read answer '?'
		case "$answer" in
		'?') diskmode_help;;
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		sys|data) break;;
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		esac
	done
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	DISK_MODE="$answer"
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fi
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if [ -z "$SWAP_SIZE" ]; then
	SWAP_SIZE=$(find_swap_size $diskdevs)
fi

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set -- $diskdevs
if [ $# -gt 1 ]; then
	USE_RAID=1
fi
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dmesg -n1

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# native disk install
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case "$DISK_MODE" in
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sys) native_disk_install$USE_LVM $diskdevs;;
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data) data_only_disk_install$USE_LVM $diskdevs;;
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none) exit 0;;
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*) echo "Not a valid install mode: $DISK_MODE" >&2; exit 1;;
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esac
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echo "$DISK_MODE" > /tmp/alpine-install-diskmode.out