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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 pkg_resources
from pkg_resources import parse_version as pver
import boto.utils as boto_utils
# Versions of boto >= 2.6.0 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.
BOTO_LAZY = False
try:
_boto_lib = pkg_resources.get_distribution('boto')
if _boto_lib.parsed_version > pver("2.5.2"): # pylint: disable=E1103
BOTO_LAZY = True
except pkg_resources.DistributionNotFound:
pass
def _unlazy_dict(mp):
if not isinstance(mp, (dict)):
return mp
if not BOTO_LAZY:
return mp
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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