[PATCH v4 4/5] iotests/108: skip if fuse is unusable

[Eric Farman <farman@linux.ibm.com>]

It is possible that the ability to fusermount is restricted
to privileged users. Rather than waiting for this test to
perform a mount and subsequently fail, perform a dummy mount
early on and skip the tests if fuse is not usable.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
---
 tests/qemu-iotests/108 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tests/qemu-iotests/108 b/tests/qemu-iotests/108
index bf808b35125..fc3f7322678 100755
--- a/tests/qemu-iotests/108
+++ b/tests/qemu-iotests/108
@@ -73,6 +73,26 @@ else
         _notrun 'Passwordless sudo for losetup or FUSE support required, but' \
                 'neither is available'
     fi
+
+    # Test to see if fuse is usable or not (permissions, etc.)
+    export_mp="$TEST_DIR/fuse-export"
+    touch "$export_mp"
+
+    response=$($QSD \
+        --blockdev null-co,node-name=export-node \
+        --export fuse,id=fuse-export,node-name=export-node,mountpoint="$export_mp",allow-other=off \
+        --daemonize \
+        --pidfile "$TEST_DIR/qsd.pid" 2>&1)
+    _notrun_on_fuse_error "$response"
+
+    if [ -f "$TEST_DIR/qsd.pid" ]; then
+        qsd_pid=$(cat "$TEST_DIR/qsd.pid")
+        kill -KILL "$qsd_pid"
+        # Wait for process to exit (cannot `wait` because the QSD is daemonized)
+        while [ -f "$TEST_DIR/qsd.pid" ]; do
+            true
+        done
+    fi
 fi
 
 echo
-- 
2.53.0