File: 3020-swap

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live-boot 1:20160511~bpo8+1
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#!/bin/sh

#set -e

Swap ()
{
	for _PARAMETER in ${LIVE_BOOT_CMDLINE}
	do
		case "${_PARAMETER}" in
			live-boot.swap=*|swap=*)
				LIVE_SWAP="true"
				LIVE_SWAP_DEVICES="${_PARAMETER#*swap=}"
				;;

			live-boot.swap|swap)
				LIVE_SWAP="true"
				;;
		esac
	done

	case "${LIVE_SWAP}" in
		true)
			;;

		*)
			return 0
			;;
	esac

	LIVE_SWAP_DEVICES="${LIVE_SWAP_DEVICES:-/dev/sd* /dev/vd*}"

	for _DEVICE in $(echo ${LIVE_SWAP_DEVICES} | sed -e 's|,| |g')
	do
		if [ ! -b "${_DEVICE}" ]
		then
			continue
		fi

		blkid -o udev -p ${_DEVICE%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue

		_MAGIC="$(/bin/dd if=${_DEVICE} bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null)" || continue

		case "${_MAGIC}" in
			SWAPSPACE2|SWAP-SPACE)
				_SWAP_DEVICES="${_SWAP_DEVICES} ${_DEVICE}"
				;;
		esac
	done

	# Remove all auto swap entries
	if grep -qs "swap swap" /root/etc/fstab
	then
		grep -v "swap swap" /root/etc/fstab > /root/etc/fstab.tmp
		mv /root/etc/fstab.tmp /root/etc/fstab
	fi

	# Add new swap entries
	for _DEVICE in ${_SWAP_DEVICES}
	do
		echo "${_DEVICE} swap swap defaults 0 0" >> /root/etc/fstab
	done
}