1 files changed, 113 insertions, 0 deletions
diff --git a/usr/local/sbin/ufslabels.sh b/usr/local/sbin/ufslabels.sh
new file mode 100644
index 0000000..4ced54f
--- /dev/null
+++ b/usr/local/sbin/ufslabels.sh
@@ -0,0 +1,113 @@
+#!/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
+cp ${FSTAB} ${FSTAB}.tmp
+
+ALL_FILESYSTEMS=`/bin/cat /etc/fstab | /usr/bin/grep ufs | /usr/bin/awk '{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
+		fi
+	else
+		echo "Unable to find device for ${FS}"
+		return -1
+	fi
+	echo "FS: ${FS} on device ${DEV} with ufsid ${UFSID}"
+done
+
+find_fs_device swap
+SWAPDEV=${DEV}
+echo "FS: Swap on device ${SWAPDEV}"
+
+if [ "${SWAPDEV}" != "" ]; then
+	/usr/bin/sed -i'' -e "s/${SWAPDEV}/label\/swap/g" ${FSTAB}.tmp
+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"
+	/sbin/glabel label swap /dev/${SWAPDEV}
+
+	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