def extract_metadata(metadata, params):
"""Examine the maas.meta file for any required metadata.
:param metadata: contents of the maas.meta file
:param params: A dict of path components for the image
(architecture, subarchitecture, kflavor, release and label).
:return: a dict of name/value metadata pairs. Currently, only
"subarches" is extracted.
"""
mapping = BootImageMapping.load_json(metadata)
subarch = params["subarchitecture"]
split_subarch = subarch.split('-')
if len(split_subarch) > 2:
kflavor = split_subarch[2]
else:
kflavor = 'generic'
image = ImageSpec(
os=params["osystem"],
arch=params["architecture"],
subarch=subarch,
kflavor=kflavor,
release=params["release"],
label=params["label"],
)
try:
# On upgrade from 1.5 to 1.6, the subarches does not exist in the
# maas.meta file . Without this catch boot images will fail to
# report until the boot images are imported again.
subarches = mapping.mapping[image]['subarches']
except KeyError:
return {}
return dict(supported_subarches=subarches)
def test_load_json_result_of_old_data_uses_ubuntu_as_os(self):
test_meta_file_content = make_maas_meta_without_os()
mapping = BootImageMapping.load_json(test_meta_file_content)
os = {image.os for image, _ in mapping.items()}.pop()
self.assertEqual("ubuntu", os)
def test_load_json_returns_empty_mapping_for_invalid_json(self):
bad_json = ""
mapping = BootImageMapping.load_json(bad_json)
self.assertEqual({}, mapping.mapping)
def test_load_json_result_matches_dump_of_own_data(self):
# Loading the test data and dumping it again should result in
# identical test data.
mapping = BootImageMapping.load_json(make_maas_meta())
dumped = mapping.dump_json()
self.assertEqual(make_maas_meta(), dumped)
