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#!/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
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