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-rw-r--r--cloudinit/util.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/cloudinit/util.py b/cloudinit/util.py
index 9976400f..338fb971 100644
--- a/cloudinit/util.py
+++ b/cloudinit/util.py
@@ -1587,6 +1587,10 @@ def mount_cb(device, callback, data=None, rw=False, mtype=None, sync=True):
mtypes = list(mtype)
elif mtype is None:
mtypes = None
+ else:
+ raise TypeError(
+ 'Unsupported type provided for mtype parameter: {_type}'.format(
+ _type=type(mtype)))
# clean up 'mtype' input a bit based on platform.
platsys = platform.system().lower()