tests: add X-mount.subdir test

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/tests/ts/mount/subtree b/tests/ts/mount/subtree
new file mode 100755 (executable)
index 0000000..d525fa5
--- /dev/null
+++ b/tests/ts/mount/subtree
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+#
+# Copyright (C) 2022 Karel Zak <kzak@redhat.com>
+#
+# This file is part of util-linux.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+TS_TOPDIR="${0%/*}/../.."
+TS_DESC="X-mount.subdir"
+
+. $TS_TOPDIR/functions.sh
+ts_init "$*"
+
+ts_check_test_command "$TS_CMD_MOUNT"
+ts_skip_nonroot
+
+ts_device_init
+DEVICE=$TS_LODEV
+
+mkfs.ext2 $DEVICE &> /dev/null || ts_die "Cannot make ext2 on $DEVICE"
+ts_udevadm_settle "$DEVICE"
+
+# use the same mountpoiunt for all subtests
+MOUNTPOINT="$TS_MOUNTPOINT"
+[ -d "$MOUNTPOINT" ] || mkdir -p $MOUNTPOINT
+
+
+# create subdirectory on the filesystem
+ts_init_subtest "init"
+$TS_CMD_MOUNT $DEVICE $MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
+ts_is_mounted $DEVICE || ts_log "Cannot find $DEVICE in /proc/mounts"
+mkdir -p $MOUNTPOINT/submnt
+touch $MOUNTPOINT/submnt/file
+$TS_CMD_UMOUNT $MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
+ts_finalize_subtest
+
+
+ts_init_subtest "subdir"
+$TS_CMD_MOUNT -o X-mount.subdir=submnt $DEVICE $MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
+ts_is_mounted $DEVICE || ts_log "Cannot find $DEVICE in /proc/mounts"
+if [ ! -f "$MOUNTPOINT/file" ]; then
+       echo "$MOUNTPOINT/file not found" >> $TS_OUTPUT 
+fi
+$TS_CMD_UMOUNT $MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
+ts_finalize_subtest
+
+
+ts_finalize