#!/bin/sh

set -e

. /lib/partman/lib/base.sh

ORIG_IFS="$IFS"

is_inactive_md() {
	local number
	number=$(echo "$1" | sed -n -e 's,/dev/md/\?,,p')
	if [ "$number" ] && ! grep -q "^md$number : active" /proc/mdstat; then
		return 0
	fi
	return 1
}

part_of_mdraid () {
	local holder
	local dev=${1#/dev/}
	for holder in /sys/block/$dev/holders/*; do
		local mddev=${holder##*/}
		case "$mddev" in
			md[0-9]|md[0-9][0-9]|md[0-9][0-9][0-9])
				return 0
				;;
		esac
	done
	return 1
}

part_of_sataraid () {
	local raiddev
	for raiddev in $(dmraid -r -c); do
		if [ "$(readlink -f $raiddev)" = $1 ]; then
			return 0
		fi
	done
	return 1
}

part_of_multipath() {
	local mpdev
	type multipath >/dev/null 2>&1 || return 1

	if is_multipath_part $1; then
		return 0
	fi
	# The block devices that make up the multipath:
	# Output looks like "(decoration-symbols) 4:0:0:1 sdc 8:32 ..."
	# (decoration-symbols are not matched; they may change again, and the spaces differ for last device)
	# (there is 1 or more spaces between fields if any disk has 4 letters; e.g., sdaa)
	for mpdev in $(multipath -l | \
		       grep -o '\([#0-9]\+:\)\{3\}[#0-9]\+ \+[hs]d[a-z]\+ \+[0-9]\+:[0-9]\+' | \
		       sed 's/  / /' | \
		       cut -f2 -d' '); do
		if [ "$(readlink -f /dev/$mpdev)" = $1 ]; then
			return 0
		fi
	done
	return 1
}

if [ ! -f /var/run/parted_server.pid ]; then
	mkdir -p /var/run
	db_get partman/alignment
	PARTMAN_ALIGNMENT="$RET" parted_server
	RET=$?
	if [ $RET != 0 ]; then
		# TODO: How do we signal we couldn't start parted_server properly?
		exit $RET
	fi

	rm -rf /var/lib/partman/old_devices
	if [ -d $DEVICES ]; then
		mv $DEVICES /var/lib/partman/old_devices
	fi
	mkdir $DEVICES || true

	IFS="$NL"
	for partdev in $(parted_devices |
		sed 's,^/dev/\(ide\|scsi\|[hs]d\|md/\?[0-9]\+\),!/dev/\1,' |
		sort |
		sed 's,^!,,' ); do

		IFS="$TAB"
		set -- $partdev
		IFS="$ORIG_IFS"

		device=$1
		size=$2
		model=$3
		label=$4

		# Skip mtd (not supported by parted) and mmcblk odities
		case "${device#/dev/}" in
			mtd* | mmcblk?rpmb | mmcblk?boot? )
				continue
				;;
		esac

		# Skip MD devices which are not active
		if [ -e /proc/mdstat ]; then
			if is_inactive_md $device; then
				continue
			fi
		fi

		# Skip devices that are part of a mdraid device
		if part_of_mdraid $device; then
			continue
		fi

		# Skip devices that are part of a dmraid device
		if type dmraid >/dev/null 2>&1 && \
		   dmraid -r -c >/dev/null 2>&1; then
			if part_of_sataraid $device && \
			   [ -f /var/lib/disk-detect/activate_dmraid ]; then
				continue
			fi
		fi

		# Skip devices that are part of a multipathed device
		if part_of_multipath $device; then
			continue
		fi

		dirname=$(echo $device | sed 's:/:=:g')
		dev=$DEVICES/$dirname
		if [ -d /var/lib/partman/old_devices/$dirname ]; then
			mv /var/lib/partman/old_devices/$dirname $dev
		else
			mkdir $dev || continue
		fi
		printf "%s" "$device" >$dev/device
		printf "%s" "$size" >$dev/size
		printf "%s" "$model" >$dev/model
		printf "%s" "$label" >$dev/label

		# Set the sataraid flag for dmraid arrays.
		if type dmraid >/dev/null 2>&1 && \
		   dmraid -s -c >/dev/null 2>&1; then
			if dmraid -sa -c | grep -q $(basename $device); then
				>$dev/sataraid
			fi
		fi

		cd $dev
		open_dialog OPEN "$(cat $dev/device)"
		read_line response
		close_dialog
		if [ "$response" = failed ]; then
			cd /
			rm -rf $dev
		fi
	done

	db_get partman/filter_mounted
	if [ "$RET" = true ]; then
		# Get a list of active mounts in a more convenient format.
		mounts=
		while read dev mp rest; do
			[ -e "$dev" ] || continue
			mappeddev="$(mapdevfs "$dev")" || true
			if [ "$mappeddev" ]; then
				dev="$mappeddev"
			fi
			mounts="${mounts:+$mounts$NL}$dev $mp"
		done < /proc/mounts
		# For each disk, check for any active mounts on it. If the
		# only thing mounted is the installation medium and it uses
		# more or less the whole disk, then silently exclude that
		# disk; if the installation medium is mounted but doesn't
		# use the whole disk, issue a warning that partitioning may
		# be difficult; if anything else is mounted, offer to
		# unmount it.
		disks_unmount=
		parts_unmount=
		part_warn=
		for dev in $DEVICES/*; do
			[ -d "$dev" ] || continue
			cd $dev
			free=0
			parts=
			instparts=
			seen_unmounted=
			open_dialog PARTITIONS
			while { read_line num id size type fs path name; [ "$id" ]; }; do
				if [ "$fs" = free ]; then
					free="$(($free + $size))"
					continue
				fi
				mappedpath="$(mapdevfs "$path")" || true
				if [ "$mappedpath" ]; then
					path="$mappedpath"
				fi
				mp=
				IFS="$NL"
				for line in $mounts; do
					restore_ifs
					if [ "$path" = "${line%% *}" ]; then
						mp="${line#* }"
						break
					fi
					IFS="$NL"
				done
				restore_ifs
				if [ "$mp" = /cdrom ]; then
					instparts="${instparts:+$instparts }$path"
				elif [ "$mp" ]; then
					parts="${parts:+$parts }$path"
				else
					seen_unmounted=1
				fi
			done
			close_dialog
			if [ "$instparts" ]; then
				if [ -z "$seen_unmounted" ] && \
				   longint_le "$free" 16777216; then
					# The installation medium uses more
					# or less the whole disk.
					open_dialog CLOSE
					close_dialog
					cd /
					rm -rf "$dev"
				else
					# There's an installation medium
					# here, but it doesn't use the whole
					# disk.
					part_warn="$instparts"
					>installation_medium
				fi
			elif [ "$parts" ]; then
				# Something other than an installation
				# medium is mounted.
				disks_unmount="${disks_unmount:+$disks_unmount }$(cat device)"
				parts_unmount="${parts_unmount:+$parts_unmount }$parts"
			fi
		done
		if [ "$disks_unmount" ]; then
			db_subst partman/unmount_active DISKS "$(echo "$disks_unmount" | sed 's/ /, /g')"
			db_fset partman/unmount_active seen false
			db_input critical partman/unmount_active || true
			db_go || exit 10
			db_get partman/unmount_active || RET=
			if [ "$RET" = true ]; then
				umount $parts_unmount || true
			fi
		fi
		if [ "$part_warn" ]; then
			db_subst partman/installation_medium_mounted PARTITION "$part_warn"
			db_fset partman/installation_medium_mounted seen false
			db_capb align
			db_input high partman/installation_medium_mounted || true
			db_go || true
			db_capb backup align
		fi
	fi

	rm -rf /var/lib/partman/old_devices
fi