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# vi: ts=4 expandtab
#
# Copyright (C) 2013 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 base64
from StringIO import StringIO
import jsonschema
from jsonschema import exceptions as js_exc
from cloudinit import exceptions as exc
from cloudinit.settings import PER_INSTANCE
from cloudinit import util
frequency = PER_INSTANCE
schema = {
'type': 'object',
'properties': {
"random_seed": {
"type": "object",
"oneOf": [
{"$ref": "#/definitions/random_seed"},
],
},
},
"required": ["random_seed"],
"additionalProperties": True,
"definitions": {
'random_seed': {
'type': 'object',
"properties" : {
'data': {
'type': "string",
},
'file': {
'type': 'string',
},
'encoding': {
"enum": ["base64", 'gzip', 'b64', 'gz', ''],
},
},
"additionalProperties": True,
},
},
}
def validate(cfg):
"""Method that can be used to ask if the given configuration will be
accepted as valid by this module, without having to actually activate this
module."""
try:
jsonschema.validate(cfg, schema)
except js_exc.ValidationError as e:
raise exc.FormatValidationError("Invalid configuration: %s" % str(e))
def _decode(data, encoding=None):
if not encoding:
return data
if not data:
return ''
if encoding.lower() in ['base64', 'b64']:
return base64.b64decode(data)
elif encoding.lower() in ['gzip', 'gz']:
return util.decomp_gzip(data, quiet=False)
else:
raise IOError("Unknown random_seed encoding: %s" % (encoding))
def handle(name, cfg, cloud, log, _args):
if not cfg or "random_seed" not in cfg:
log.debug(("Skipping module named %s, "
"no 'random_seed' configuration found"), name)
return
validate(cfg)
my_cfg = cfg['random_seed']
seed_path = my_cfg.get('file', '/dev/urandom')
seed_buf = StringIO()
seed_buf.write(_decode(my_cfg.get('data', ''),
encoding=my_cfg.get('encoding')))
metadata = cloud.datasource.metadata
if metadata and 'random_seed' in metadata:
seed_buf.write(metadata['random_seed'])
seed_data = seed_buf.getvalue()
if len(seed_data):
log.debug("%s: adding %s bytes of random seed entrophy to %s", name,
len(seed_data), seed_path)
util.append_file(seed_path, seed_data)
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