[PATCH] test: fix mountpoint device check in libmount/loop

[Ruediger Meier <sweet_f_a@gmx.de>]

From: Ruediger Meier <ruediger.meier@ga-group.nl>

This test could fail if the build directory is somehow exoticly
mounted (shared bind mounts, symlinks).

CC: Stanislav Brabec <sbrabec@suse.cz>
Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
---
 tests/ts/libmount/loop | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/tests/ts/libmount/loop b/tests/ts/libmount/loop
index 452732f..893d902 100755
--- a/tests/ts/libmount/loop
+++ b/tests/ts/libmount/loop
@@ -23,12 +23,24 @@ TS_DESC="losetup-loop"
 ts_init "$*"
 
 ts_check_test_command "$TS_CMD_MOUNT"
+ts_check_test_command "$TS_CMD_FINDMNT"
 ts_check_test_command "$TS_CMD_LOSETUP"
 
 ts_skip_nonroot
 ts_check_losetup
 ts_check_prog "mkfs.ext3"
 
+function verify_mount_dev {
+	local dev=$1
+	local mp=$2
+	local dev_mounted=$($TS_CMD_FINDMNT -no SOURCE "$mp")
+
+	if test "$dev" != "$dev_mounted" ; then
+		echo "Mounted incorrect device: have '$dev_mounted', want '$dev'" >&2
+		return 1
+	fi
+}
+
 #
 # file-* tests: Backing file is a regular file
 #
@@ -61,10 +73,7 @@ ts_init_subtest "dev-loop"
 [ -d "$TS_MOUNTPOINT" ] || mkdir -p $TS_MOUNTPOINT
 LODEV=$( $TS_CMD_LOSETUP --find --nooverlap --show $BACKFILE 2>> $TS_OUTPUT )
 $TS_CMD_MOUNT $LODEV "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
-MOUNTED_LODEV="$( $TS_CMD_MOUNT | grep "$TS_MOUNTPOINT" | while read LODEV REST ; do echo $LODEV ; done )"
-if test "$MOUNTED_LODEV" != "$LODEV" ; then
-    echo "Mounted incorrect device mounts: $MOUNTED_LODEV, wants: $LODEV" >> $TS_OUTPUT
-fi
+verify_mount_dev "$LODEV" "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 $TS_CMD_UMOUNT "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 $TS_CMD_LOSETUP --detach $LODEV >> $TS_OUTPUT 2>&1
 udevadm settle
@@ -75,10 +84,7 @@ ts_init_subtest "o-loop-val"
 [ -d "$TS_MOUNTPOINT" ] || mkdir -p $TS_MOUNTPOINT
 LODEV=$( $TS_CMD_LOSETUP --find 2>> $TS_OUTPUT )
 $TS_CMD_MOUNT -oloop=$LODEV "$BACKFILE" "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
-MOUNTED_LODEV="$( cat /proc/self/mounts |  grep "$TS_MOUNTPOINT" | while read LODEV REST ; do echo $LODEV ; done )"
-if test "$MOUNTED_LODEV" != "$LODEV" ; then
-    echo "Mounted incorrect device mounts: $MOUNTED_LODEV, wants: $LODEV" >> $TS_OUTPUT
-fi
+verify_mount_dev "$LODEV" "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 $TS_CMD_UMOUNT "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 udevadm settle
 ts_log "Success"
@@ -88,10 +94,7 @@ ts_init_subtest "reuse"
 [ -d "$TS_MOUNTPOINT" ] || mkdir -p $TS_MOUNTPOINT
 LODEV=$( $TS_CMD_LOSETUP --find --nooverlap --show "$BACKFILE" 2>> $TS_OUTPUT )
 $TS_CMD_MOUNT "$BACKFILE" "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
-MOUNTED_LODEV="$( cat /proc/self/mounts |  grep "$TS_MOUNTPOINT" | while read LODEV REST ; do echo $LODEV ; done )"
-if test "$MOUNTED_LODEV" != "$LODEV" ; then
-    echo "Mounted incorrect device mounts: $MOUNTED_LODEV, wants: $LODEV" >> $TS_OUTPUT
-fi
+verify_mount_dev "$LODEV" "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 $TS_CMD_UMOUNT "$TS_MOUNTPOINT" >> $TS_OUTPUT 2>&1
 $TS_CMD_LOSETUP --detach $LODEV >> $TS_OUTPUT 2>&1
 udevadm settle
-- 
1.8.5.6