60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import boto.utils as boto_utils
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# Versions of boto >= 2.6.0 (and possibly 2.5.2)
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# try to lazily load the metadata backing, which
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# doesn't work so well in cloud-init especially
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# since the metadata is serialized and actions are
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# performed where the metadata server may be blocked
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# (thus the datasource will start failing) resulting
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# in url exceptions when fields that do exist (or
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# would have existed) do not exist due to the blocking
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# that occurred.
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def _unlazy_dict(mp):
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if not isinstance(mp, (dict)):
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return mp
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# Walk over the keys/values which
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# forces boto to unlazy itself and
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# has no effect on dictionaries that
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# already have there items.
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for (_k, v) in mp.items():
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_unlazy_dict(v)
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return mp
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def get_instance_userdata(api_version, metadata_address):
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# Note: boto.utils.get_instance_metadata returns '' for empty string
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# so the change from non-true to '' is not specifically necessary, but
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# this way cloud-init will get consistent behavior even if boto changed
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# in the future to return a None on "no user-data provided".
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ud = boto_utils.get_instance_userdata(api_version, None, metadata_address)
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if not ud:
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ud = ''
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return ud
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def get_instance_metadata(api_version, metadata_address):
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metadata = boto_utils.get_instance_metadata(api_version, metadata_address)
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if not isinstance(metadata, (dict)):
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metadata = {}
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return _unlazy_dict(metadata)
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