# 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 # Author: Juerg Haefliger # Author: Joshua Harlow # # 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 . 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.info("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" % (ds_names) raise DataSourceNotFoundException(msg) # return a list of classes that have the same depends as 'depends' # iterate through cfg_list, loading "DataSourceCollections" modules # and calling their "get_datasource_list". # return an ordered list of classes that match def list_sources(cfg_list, depends, pkg_list): src_list = [] LOG.info(("Looking for for data source in: %s," " via packages %s that matches dependencies %s"), cfg_list, pkg_list, depends) for ds_coll in cfg_list: ds_name = str(ds_coll) if not ds_name.startswith(DS_PREFIX): ds_name = '%s%s' % (DS_PREFIX, ds_name) for pkg in pkg_list: pkg_name = [] if pkg: pkg_name.append(str(pkg)) pkg_name.append(ds_name) try: mod = importer.import_module(".".join(pkg_name)) except RuntimeError: continue lister = getattr(mod, "get_datasource_list", None) if not lister: continue cls_matches = lister(depends) if not cls_matches: continue src_list.extend(cls_matches) LOG.debug(("Found a match" " in %s with matches %s"), mod, cls_matches) break return src_list # depends is a list of dependencies (DEP_FILESYSTEM) # dslist is a list of 2 item lists # dslist = [ # ( class, ( depends-that-this-class-needs ) ) # } # it returns a list of 'class' that matched these deps exactly # it is a helper function for DataSourceCollections def list_from_depends(depends, dslist): ret_list = [] depset = set(depends) for (cls, deps) in dslist: if depset == set(deps): ret_list.append(cls) return ret_list