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# vi: ts=4 expandtab
#
# Copyright (C) 2013 Yahoo! Inc.
# Copyright (C) 2014 Canonical, Ltd
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Dustin Kirkland <kirkland@ubuntu.com>
# Author: Scott Moser <scott.moser@canonical.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
import os
from six import StringIO
from cloudinit.settings import PER_INSTANCE
from cloudinit import log as logging
from cloudinit import util
frequency = PER_INSTANCE
LOG = logging.getLogger(__name__)
def _decode(data, encoding=None):
if not data:
return ''
if not encoding or encoding.lower() in ['raw']:
return data
elif encoding.lower() in ['base64', 'b64']:
# Try to give us a native string in both Python 2 and 3, and remember
# that b64decode() returns bytes in Python 3.
decoded = base64.b64decode(data)
try:
return decoded.decode('utf-8')
except UnicodeDecodeError:
return decoded
elif encoding.lower() in ['gzip', 'gz']:
return util.decomp_gzip(data, quiet=False)
else:
raise IOError("Unknown random_seed encoding: %s" % (encoding))
def handle_random_seed_command(command, required, env=None):
if not command and required:
raise ValueError("no command found but required=true")
elif not command:
LOG.debug("no command provided")
return
cmd = command[0]
if not util.which(cmd):
if required:
raise ValueError("command '%s' not found but required=true", cmd)
else:
LOG.debug("command '%s' not found for seed_command", cmd)
return
util.subp(command, env=env, capture=False)
def handle(name, cfg, cloud, log, _args):
mycfg = cfg.get('random_seed', {})
seed_path = mycfg.get('file', '/dev/urandom')
seed_data = mycfg.get('data', '')
seed_buf = StringIO()
if seed_data:
seed_buf.write(_decode(seed_data, encoding=mycfg.get('encoding')))
# 'random_seed' is set up by Azure datasource, and comes already in
# openstack meta_data.json
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 entropy to %s", name,
len(seed_data), seed_path)
util.append_file(seed_path, seed_data)
command = mycfg.get('command', ['pollinate', '-q'])
req = mycfg.get('command_required', False)
try:
env = os.environ.copy()
env['RANDOM_SEED_FILE'] = seed_path
handle_random_seed_command(command=command, required=req, env=env)
except ValueError as e:
log.warn("handling random command [%s] failed: %s", command, e)
raise e
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