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