~landscape/charms/precise/storage/multiple-units

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device_path = common_util._get_from_relation(

"block-storage", "block-device-path")

# Get the device path from block-device-path-map if it exists, since

# that works when multiple storage units exist. Older version of the

# block-storage-broker charm doesn't set it, though.

device_path_map = common_util._get_from_relation(

"block-storage", "block-device-path-map")

if device_path_map is not None:

device_path_map = json.loads(device_path_map)

hookenv.log(