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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# 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 abc
from cloudinit import importer
from cloudinit import log as logging
from cloudinit import user_data as ud
from cloudinit import util
DEP_FILESYSTEM = "FILESYSTEM"
DEP_NETWORK = "NETWORK"
DS_PREFIX = 'DataSource'
LOG = logging.getLogger(__name__)
class DataSourceNotFoundException(Exception):
pass
class DataSource(object):
__metaclass__ = abc.ABCMeta
def __init__(self, sys_cfg, distro, paths, ud_proc=None):
self.sys_cfg = sys_cfg
self.distro = distro
self.paths = paths
self.userdata = None
self.metadata = None
self.userdata_raw = None
name = util.obj_name(self)
if name.startswith(DS_PREFIX):
name = name[len(DS_PREFIX):]
self.ds_cfg = util.get_cfg_by_path(self.sys_cfg,
("datasource", name), {})
if not ud_proc:
self.ud_proc = ud.UserDataProcessor(self.paths)
else:
self.ud_proc = ud_proc
def get_userdata(self):
if self.userdata is None:
raw_data = self.get_userdata_raw()
self.userdata = self.ud_proc.process(raw_data)
return self.userdata
def get_userdata_raw(self):
return self.userdata_raw
# the data sources' config_obj is a cloud-config formated
# object that came to it from ways other than cloud-config
# because cloud-config content would be handled elsewhere
def get_config_obj(self):
return {}
def get_public_ssh_keys(self):
keys = []
if not self.metadata or 'public-keys' not in self.metadata:
return keys
if isinstance(self.metadata['public-keys'], (basestring, str)):
return str(self.metadata['public-keys']).splitlines()
if isinstance(self.metadata['public-keys'], (list, set)):
return list(self.metadata['public-keys'])
if isinstance(self.metadata['public-keys'], (dict)):
for (_keyname, klist) in self.metadata['public-keys'].iteritems():
# lp:506332 uec metadata service responds with
# data that makes boto populate a string for 'klist' rather
# than a list.
if isinstance(klist, (str, basestring)):
klist = [klist]
if isinstance(klist, (list, set)):
for pkey in klist:
# There is an empty string at
# the end of the keylist, trim it
if pkey:
keys.append(pkey)
return keys
def device_name_to_device(self, _name):
# translate a 'name' to a device
# the primary function at this point is on ec2
# to consult metadata service, that has
# ephemeral0: sdb
# and return 'sdb' for input 'ephemeral0'
return None
def get_locale(self):
return 'en_US.UTF-8'
def get_local_mirror(self):
# ??
return None
def get_instance_id(self):
if not self.metadata or 'instance-id' not in self.metadata:
# Return a magic not really instance id string
return "iid-datasource"
return str(self.metadata['instance-id'])
def get_hostname(self, fqdn=False):
defdomain = "localdomain"
defhost = "localhost"
domain = defdomain
if not self.metadata or not 'local-hostname' in self.metadata:
# this is somewhat questionable really.
# the cloud datasource was asked for a hostname
# and didn't have one. raising error might be more appropriate
# but instead, basically look up the existing hostname
toks = []
hostname = util.get_hostname()
fqdn = util.get_fqdn_from_hosts(hostname)
if fqdn and fqdn.find(".") > 0:
toks = str(fqdn).split(".")
elif hostname:
toks = [hostname, defdomain]
else:
toks = [defhost, defdomain]
else:
# if there is an ipv4 address in 'local-hostname', then
# make up a hostname (LP: #475354) in format ip-xx.xx.xx.xx
lhost = self.metadata['local-hostname']
if util.is_ipv4(lhost):
toks = "ip-%s" % lhost.replace(".", "-")
else:
toks = lhost.split(".")
if len(toks) > 1:
hostname = toks[0]
domain = '.'.join(toks[1:])
else:
hostname = toks[0]
if fqdn:
return "%s.%s" % (hostname, domain)
else:
return hostname
def find_source(sys_cfg, distro, paths, ds_deps, cfg_list, pkg_list):
ds_list = list_sources(cfg_list, ds_deps, pkg_list)
ds_names = [util.obj_name(f) for f in ds_list]
LOG.debug("Searching for data source in: %s", ds_names)
for cls in ds_list:
try:
LOG.debug("Seeing if we can get any data from %s", cls)
s = cls(sys_cfg, distro, paths)
if s.get_data():
return (s, util.obj_name(cls))
except Exception:
util.logexc(LOG, "Getting data from %s failed", cls)
msg = ("Did not find any data source,"
" searched classes: (%s)") % (", ".join(ds_names))
raise DataSourceNotFoundException(msg)
# Return a list of classes that have the same depends as 'depends'
# iterate through cfg_list, loading "DataSource*" modules
# and calling their "get_datasource_list".
# Return an ordered list of classes that match (if any)
def list_sources(cfg_list, depends, pkg_list):
src_list = []
LOG.debug(("Looking for for data source in: %s,"
" via packages %s that matches dependencies %s"),
cfg_list, pkg_list, depends)
for ds_name in cfg_list:
if not ds_name.startswith(DS_PREFIX):
ds_name = '%s%s' % (DS_PREFIX, ds_name)
m_locs = importer.find_module(ds_name,
pkg_list,
['get_datasource_list'])
for m_loc in m_locs:
mod = importer.import_module(m_loc)
lister = getattr(mod, "get_datasource_list")
matches = lister(depends)
if matches:
src_list.extend(matches)
break
return src_list
# 'depends' is a list of dependencies (DEP_FILESYSTEM)
# ds_list is a list of 2 item lists
# ds_list = [
# ( class, ( depends-that-this-class-needs ) )
# }
# It returns a list of 'class' that matched these deps exactly
# It mainly is a helper function for DataSourceCollections
def list_from_depends(depends, ds_list):
ret_list = []
depset = set(depends)
for (cls, deps) in ds_list:
if depset == set(deps):
ret_list.append(cls)
return ret_list
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