utils: add mkdir error report in mount_mkdir

Add exception checks to the os.mkdir operation and log the error
found. The previous implementation was too optimistic and only
handled mount related errors.

src/utils/fs.py

@@ -36,7 +36,11 @@ def mount_mkdir(source, target):
     Return True if mount is sucessful or if target is already a mountpoint.
     """
     if not os.path.exists(target):
-        os.mkdir(target)
+        try:
+            os.mkdir(target)
+        except OSError as e:
+            logging.error(f'mkdir operation failed. Reported {e}')
+            return False
 
     if not os.path.ismount(target):
         return mount(source, target)