tests: Ensure that mountpoints are unmounted before exiting

When all tests complete successfully, filesystems mounted by grub-fs-tester
will be unmounted before exiting. However, on certain test failures the
tester will exit with a failure code and not unmount previously mounted
filesystems. Now keep track of mounts and umounts and run an exit handler
on exit or process interruption that will umount all mounts that haven't
already been unmounted.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

tests/util/grub-fs-tester.in

@@ -14,6 +14,16 @@ tempdir=`mktemp -d "${TMPDIR:-/tmp}/${0##*/}.$(date '+%Y%m%d%H%M%S%N').${fs}.XXX
 # FSLABEL. This is especially needed for the conversion to Joliet UCS-2.
 XORRISOFS_CHARSET="-input-charset UTF-8 -output-charset UTF-8"
 
+MOUNTS=
+cleanup() {
+    for i in $MOUNTS; do
+	umount "$i" || :
+    done
+}
+trap cleanup EXIT INT
+# This is for bash, dash and ash do not recognize ERR
+trap cleanup ERR || :
+
 # This wrapper is to ease insertion of valgrind or time statistics
 run_it () {
     LC_ALL=C "$GRUBFSTEST" "$@"
@@ -935,6 +945,7 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 			done
 			exit 99;
 		    fi
+		    MOUNTS="$MOUNTS $MNTPOINTRW"
 		    ;;
 	    esac
 	    case x"$fs" in
@@ -1059,11 +1070,13 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 		x"bfs")
 		    sleep 1
 		    fusermount -u "$MNTPOINTRW"
+		    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRW||g;")"
 		    ;;
 		xlvm*)
 		    sleep 1
 		    for try in $(range 0 20 1); do
 			if umount "$MNTPOINTRW" ; then
+			    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRW||g;")"
 			    break;
 			fi
 			sleep 1;
@@ -1076,6 +1089,7 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 		    sleep 1
 		    for try in $(range 0 20 1); do
 			if umount "$MNTPOINTRW" ; then
+			    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRW||g;")"
 			    break;
 			fi
 			sleep 1;
@@ -1088,6 +1102,7 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 		    sleep 1
 		    for try in $(range 0 20 1); do
 			if umount "$MNTPOINTRW" ; then
+			    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRW||g;")"
 			    break;
 			fi
 			sleep 1;
@@ -1117,13 +1132,19 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 		xlvm*)
 		    vgchange -a y grub_test
 		    sleep 1
-		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro ;;
+		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro
+		    MOUNTS="$MOUNTS $MNTPOINTRO"
+		    ;;
 		xmdraid*)
 		    mdadm --assemble /dev/md/"${fs}_$NDEVICES" $LODEVICES
 		    sleep 1
-		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro ;;
+		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro
+		    MOUNTS="$MOUNTS $MNTPOINTRO"
+		    ;;
 		*)
-		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro ;;
+		    mount -t "$MOUNTFS" "${MOUNTDEVICE}" "$MNTPOINTRO" -o ${MOUNTOPTS}${SELINUXOPTS}ro
+		    MOUNTS="$MOUNTS $MNTPOINTRO"
+		    ;;
 	    esac
 
 	    run_grubfstest ls -- -la
@@ -1548,6 +1569,8 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE" "$MAXLOGSECSIZE" 1); do
 		    sleep 1
 		    umount "$MNTPOINTRO"  || true
 		    umount "$MNTPOINTRW" || true
+		    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRO||g;")"
+		    MOUNTS="$(echo ${MOUNTS} | sed "s|$MNTPOINTRW||g;")"
 	    esac
 	    sleep 1
 	    case x"$fs" in