Index: head/usr.sbin/bsdinstall/scripts/script
===================================================================
--- head/usr.sbin/bsdinstall/scripts/script
+++ head/usr.sbin/bsdinstall/scripts/script
@@ -42,6 +42,11 @@
 # DISTRIBUTIONS
 # BSDINSTALL_DISTDIR
 
+#
+# Default name of the ZFS boot-pool
+#
+: ${ZFSBOOT_POOL_NAME:=zroot}
+
 ############################################################ GLOBALS
 
 #
@@ -53,8 +58,6 @@
 
 error()
 {
-	[ -f "$PATH_FSTAB" ] && bsdinstall umount
-	
 	local file
 	f_getvar "$VAR_DEBUG_FILE#+" file
 	if [ "$file" ]; then
@@ -63,6 +66,13 @@
 		# No need to restore title, pining for the fjords
 	fi
 
+	[ -f "$PATH_FSTAB" ] || exit
+	if [ "$ZFSBOOT_DISKS" ]; then
+		zpool export $ZFSBOOT_POOL_NAME
+	else
+		bsdinstall umount
+	fi
+
 	exit 1
 }
 
@@ -99,8 +109,8 @@
 	bsdinstall zfsboot
 else
 	bsdinstall scriptedpart "$PARTITIONS"
+	bsdinstall mount
 fi
-bsdinstall mount
 
 # Unpack distributions
 bsdinstall checksum
@@ -125,7 +135,11 @@
 fi
 
 bsdinstall entropy
-bsdinstall umount
+if [ "$ZFSBOOT_DISKS" ]; then
+	zpool export $ZFSBOOT_POOL_NAME
+else
+	bsdinstall umount
+fi
 
 f_dprintf "Installation Completed at %s" "$( date )"