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# vi: ts=4 expandtab
#
# Author: Vaidas Jablonskis <jablonskis@gmail.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/>.
from base64 import b64decode
from cloudinit import log as logging
from cloudinit import util
from cloudinit import sources
from cloudinit import url_helper
LOG = logging.getLogger(__name__)
BUILTIN_DS_CONFIG = {
'metadata_url': 'http://metadata.google.internal./computeMetadata/v1/'
}
REQUIRED_FIELDS = ('instance-id', 'availability-zone', 'local-hostname')
class DataSourceGCE(sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.metadata = dict()
self.ds_cfg = util.mergemanydict([
util.get_cfg_by_path(sys_cfg, ["datasource", "GCE"], {}),
BUILTIN_DS_CONFIG])
self.metadata_address = self.ds_cfg['metadata_url']
# GCE takes sshKeys attribute in the format of '<user>:<public_key>'
# so we have to trim each key to remove the username part
def _trim_key(self, public_key):
try:
index = public_key.index(':')
if index > 0:
return public_key[(index + 1):]
except:
return public_key
def get_data(self):
# GCE metadata server requires a custom header since v1
headers = {'X-Google-Metadata-Request': True}
# url_map: (our-key, path, required)
url_map = [
('instance-id', 'instance/id', True),
('availability-zone', 'instance/zone', True),
('local-hostname', 'instance/hostname', True),
('public-keys', 'project/attributes/sshKeys', False),
('user-data', 'instance/attributes/user-data', False),
('user-data-encoding', 'instance/attributes/user-data-encoding', False),
]
# if we cannot resolve the metadata server, then no point in trying
if not util.is_resolvable_url(self.metadata_address):
LOG.debug("%s is not resolvable", self.metadata_address)
return False
# iterate over url_map keys to get metadata items
found = False
for (mkey, path, required) in url_map:
try:
resp = url_helper.readurl(url=self.metadata_address + path,
headers=headers)
if resp.code == 200:
found = True
self.metadata[mkey] = resp.contents
else:
if required:
msg = "required url %s returned code %s. not GCE"
if not found:
LOG.debug(msg, path, resp.code)
else:
LOG.warn(msg, path, resp.code)
return False
else:
self.metadata[mkey] = None
except url_helper.UrlError as e:
if required:
msg = "required url %s raised exception %s. not GCE"
if not found:
LOG.debug(msg, path, e)
else:
LOG.warn(msg, path, e)
return False
msg = "Failed to get %s metadata item: %s."
LOG.debug(msg, path, e)
self.metadata[mkey] = None
if self.metadata['public-keys']:
lines = self.metadata['public-keys'].splitlines()
self.metadata['public-keys'] = [self._trim_key(k) for k in lines]
encoding = self.metadata.get('user-data-encoding')
if encoding:
if encoding == 'base64':
self.metadata['user-data'] = b64decode(self.metadata['user-data'])
else:
LOG.warn('unknown user-data-encoding: %s, ignoring', encoding)
return found
@property
def launch_index(self):
# GCE does not provide lauch_index property
return None
def get_instance_id(self):
return self.metadata['instance-id']
def get_public_ssh_keys(self):
return self.metadata['public-keys']
def get_hostname(self, fqdn=False, _resolve_ip=False):
return self.metadata['local-hostname']
def get_userdata_raw(self):
return self.metadata['user-data']
@property
def availability_zone(self):
return self.metadata['availability-zone']
# Used to match classes to dependencies
datasources = [
(DataSourceGCE, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)),
]
# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return sources.list_from_depends(depends, datasources)
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