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# vi: ts=4 expandtab
#
# Copyright (C) 2013 Canonical Ltd.
#
# 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 xml.dom import minidom
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import util
LOG = logging.getLogger(__name__)
DS_NAME = 'Azure'
DEFAULT_METADATA = {"instance-id": "iid-AZURE-NODE"}
AGENT_START = ['service', 'walinuxagent', 'start']
DEFAULT_DS_CONFIG = {'datasource': {DS_NAME: {'agent_command': AGENT_START}}}
class DataSourceAzureNet(sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.seed_dir = os.path.join(paths.seed_dir, 'azure')
self.cfg = {}
self.seed = None
def __str__(self):
root = sources.DataSource.__str__(self)
return "%s [seed=%s]" % (root, self.seed)
def get_data(self):
candidates = [self.seed_dir]
candidates.extend(list_possible_azure_ds_devs())
found = None
for cdev in candidates:
try:
if cdev.startswith("/dev/"):
ret = util.mount_cb(cdev, load_azure_ds_dir)
else:
ret = load_azure_ds_dir(cdev)
except NonAzureDataSource:
pass
except BrokenAzureDataSource as exc:
raise exc
except util.MountFailedError:
LOG.warn("%s was not mountable" % cdev)
(md, self.userdata_raw, cfg) = ret
self.seed = cdev
self.metadata = util.mergemanydict([md, DEFAULT_METADATA])
self.cfg = util.mergemanydict([cfg, DEFAULT_DS_CONFIG])
found = cdev
LOG.debug("found datasource in %s", cdev)
break
if not found:
return False
path = ['datasource', DS_NAME, 'agent_command']
cmd = None
for cfg in (self.cfg, self.sys_cfg):
cmd = util.get_cfg_by_path(cfg, keyp=path)
if cmd is not None:
break
invoke_agent(cmd)
def get_config_obj(self):
return self.cfg
def invoke_agent(cmd):
if cmd:
LOG.debug("invoking agent: %s" % cmd)
util.subp(cmd, shell=(not isinstance(cmd, list)))
else:
LOG.debug("not invoking agent")
def find_child(node, filter_func):
ret = []
if not node.hasChildNodes():
return ret
for child in node.childNodes:
if filter_func(child):
ret.append(child)
return ret
def read_azure_ovf(contents):
dom = minidom.parseString(contents)
results = find_child(dom.documentElement,
lambda n: n.localName == "ProvisioningSection")
if len(results) == 0:
raise NonAzureDataSource("No ProvisioningSection")
if len(results) > 1:
raise BrokenAzureDataSource("found '%d' ProvisioningSection items" %
len(results))
provSection = results[0]
lpcs_nodes = find_child(provSection,
lambda n: n.localName == "LinuxProvisioningConfigurationSet")
if len(results) == 0:
raise NonAzureDataSource("No LinuxProvisioningConfigurationSet")
if len(results) > 1:
raise BrokenAzureDataSource("found '%d' %ss" %
("LinuxProvisioningConfigurationSet",
len(results)))
lpcs = lpcs_nodes[0]
if not lpcs.hasChildNodes():
raise BrokenAzureDataSource("no child nodes of configuration set")
md_props = 'seedfrom'
md = {'azure_data': {}}
cfg = {}
ud = ""
for child in lpcs.childNodes:
if child.nodeType == dom.TEXT_NODE or not child.localName:
continue
name = child.localName.lower()
simple = False
if (len(child.childNodes) == 1 and
child.childNodes[0].nodeType == dom.TEXT_NODE):
simple = True
value = child.childNodes[0].wholeText
if name == "userdata":
ud = base64.b64decode(''.join(value.split()))
elif name == "username":
cfg['system_info'] = {'default_user': {'name': value}}
elif name == "hostname":
md['local-hostname'] = value
elif name == "dscfg":
cfg['datasource'] = {DS_NAME: util.load_yaml(value, default={})}
elif simple:
if name in md_props:
md[name] = value
else:
md['azure_data'][name] = value
return (md, ud, cfg)
def list_possible_azure_ds_devs():
# return a sorted list of devices that might have a azure datasource
devlist = []
for fstype in ("iso9660", "udf"):
devlist.extend(util.find_devs_with("TYPE=%s" % fstype))
devlist.sort(reverse=True)
return devlist
def load_azure_ds_dir(source_dir):
ovf_file = os.path.join(source_dir, "ovf-env.xml")
if not os.path.isfile(ovf_file):
raise NonAzureDataSource("No ovf-env file found")
with open(ovf_file, "r") as fp:
contents = fp.read()
return read_azure_ovf(contents)
class BrokenAzureDataSource(Exception):
pass
class NonAzureDataSource(Exception):
pass
# Used to match classes to dependencies
datasources = [
(DataSourceAzureNet, (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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