pfSense

#!/bin/sh

############################################

#

# Change fstab to use ufsid and geom labels to avoid relying on device numbers directly.

#

############################################

# : cat /etc/fstab

# # Device                Mountpoint      FStype  Options         Dump    Pass#

# /dev/ad0s1a             /               ufs     rw              1       1

# /dev/ad0s1b             none            swap    sw              0       0

string_length() {

	unset LEN

	LEN=`echo -n ${1} | /usr/bin/wc -m | awk '{print $1}'`

}

get_ufsid() {

	# $1 = device

	# : /sbin/dumpfs /dev/ad0s1a | /usr/bin/head -n 2 | /usr/bin/tail -n 1 | /usr/bin/cut -f2 -d'[' | /usr/bin/cut -f1 -d ']' | /usr/bin/sed -e 's/[[:blank:]]//g'

	# 51928c99a471c440

	unset UFSID

	ID_PARTS=`/sbin/dumpfs /dev/${1} | /usr/bin/head -n 2 | /usr/bin/tail -n 1 | /usr/bin/cut -f2 -d'[' | /usr/bin/cut -f1 -d ']'`

	# " 51110eb0 f288b35d " (note it has more spaces than we need/want)

	ID_PART1=`echo ${ID_PARTS} | awk '{print $1;}'`

	# "51110eb0"

	ID_PART2=`echo ${ID_PARTS} | awk '{print $2;}'`

	# "f288b35d"

	if [ "${ID_PART1}" = "" ] || [ "${ID_PART2}" = "" ]; then

		echo "Invalid ufsid on ${1} (${ID_PARTS}), cannot continue"

		exit.

	fi

	# Safety check to avoid http://www.freebsd.org/cgi/query-pr.cgi?pr=156908

	string_length ${ID_PART1}

	if [ ${LEN} -ne 8 ]; then

		ID_PART1=`printf "%08s" "${ID_PART1}"`

	fi

	string_length ${ID_PART2}

	if [ ${LEN} -ne 8 ]; then

		ID_PART2=`printf "%08s" "${ID_PART2}"`

	fi

	UFSID=${ID_PART1}${ID_PART2}

}

find_fs_device(){

	unset DEV

	DEV=`/usr/bin/grep -e "[[:blank:]]${1}[[:blank:]]" ${FSTAB} | awk '{print $1;}'`

	DEV=${DEV##/dev/}

}

FSTAB=/etc/fstab

NEED_CHANGES=false

cp ${FSTAB} ${FSTAB}.tmp

ALL_FILESYSTEMS=`/bin/cat /etc/fstab | /usr/bin/awk '/ufs/ && !(/dev\/mirror\// || /dev\/ufsid\// || /dev\/label\// || /dev\/geom\//) {print $2;}'`

for FS in ${ALL_FILESYSTEMS}

do

	find_fs_device ${FS}

	if [ "${DEV}" != "" ]; then

		get_ufsid ${DEV}

		string_length ${UFSID}

		if [ ${LEN} -ne 16 ]; then

			echo "Invalid UFS ID for FS ${FS} ($UFSID), skipping"

		else

			/usr/bin/sed -i'' -e "s/${DEV}/ufsid\/${UFSID}/g" ${FSTAB}.tmp

			NEED_CHANGES=true

		fi

	else

		echo "Unable to find device for ${FS}"

		return -1

	fi

	echo "FS: ${FS} on device ${DEV} with ufsid ${UFSID}"

done

ALL_SWAPFS=`/bin/cat /etc/fstab | /usr/bin/awk '/swap/ && !(/dev\/mirror\// || /dev\/ufsid\// || /dev\/label\// || /dev\/geom\//) {print $1;}'`

SWAPNUM=0

for SFS in ${ALL_SWAPFS}

do

	DEV=${SFS##/dev/}

	if [ "${DEV}" != "" ]; then

		SWAPDEV=${DEV}

		echo "FS: Swap slice ${SWAPNUM} on device ${SWAPDEV}"

		if [ "${SWAPDEV}" != "" ]; then

			/usr/bin/sed -i'' -e "s/${SWAPDEV}/label\/swap${SWAPNUM}/g" ${FSTAB}.tmp

			NEED_CHANGES=true

		fi

		SWAPNUM=`expr ${SWAPNUM} + 1`

	fi

done

if [ "${NEED_CHANGES}" = "false" ]; then

	echo Nothing to do, all filesystems and swap already use some form of device-independent labels

	exit

fi

echo "===================="

echo "Current fstab:"

cat ${FSTAB}

echo "===================="

echo "New fstab:"

cat ${FSTAB}.tmp

if [ "${1}" = "commit" ]; then

	COMMIT=y

else

	echo "Commit changes? (y/n):"

	read COMMIT

fi

# Commit changes

if [ "${COMMIT}" = "y" ] || [ "${COMMIT}" = "Y" ]; then

	echo "Disabling swap to apply label"

	/sbin/swapoff /dev/${SWAPDEV}

	echo "Applying label to swap parition"

	SWAPNUM=0

	for SFS in ${ALL_SWAPFS}

	do

		find_fs_device ${SFS}

		if [ "${DEV}" != "" ]; then

			SWAPDEV=${DEV}

			if [ "${SWAPDEV}" != "" ]; then

				/sbin/glabel label swap${SWAPNUM} /dev/${SWAPDEV}

			fi

			SWAPNUM=`expr ${SWAPNUM} + 1`

		fi

	done

	echo "Activating new fstab"

	/bin/mv -f ${FSTAB} ${FSTAB}.old

	/bin/mv -f ${FSTAB}.tmp ${FSTAB}

	echo "Re-enabling swap"

	/sbin/swapon -a 2>/dev/null >/dev/null

fi