cdfbdc65b6
The DataSources that are loaded are now controlled entirely via configuration file of 'datasource_list', like: datasource_list: [ "NoCloud", "OVF", "Ec2" ] Each item in that list is a "DataSourceCollection". for each item in the list, cloudinit will attempt to load: cloudinit.DataSource<item> and, failing that, DataSource<item> The module is required to have a method named 'get_datasource_list' in it that takes a single list of "dependencies" and returns a list of python classes inside the collection that can run needing only those dependencies. The dependencies are defines in DataSource.py. Currently: DEP_FILESYSTEM = "FILESYSTEM" DEP_NETWORK = "NETWORK" When 'get_datasource_list' is called for the DataSourceOVF module with [DEP_FILESYSTEM], then DataSourceOVF returns a single item list with a reference to the 'DataSourceOVF' class. When 'get_datasource_list' is called for the DataSourceOVF module with [DEP_FILESYSTEM, DEP_NETWORK], it will return a single item list with a reference to 'DataSourceOVFNet'. cloudinit will then instanciate the class and call its 'get_data' method. if the get_data method returns 'True', then it selects this class as the selected Datasource.
144 lines
4.6 KiB
Python
144 lines
4.6 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2009-2010 Canonical Ltd.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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DEP_FILESYSTEM = "FILESYSTEM"
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DEP_NETWORK = "NETWORK"
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import UserDataHandler as ud
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class DataSource:
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userdata = None
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metadata = None
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userdata_raw = None
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log = None
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def __init__(self, log=None):
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if not log:
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import logging
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log = logging.log
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self.log = log
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def get_userdata(self):
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if self.userdata == None:
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self.userdata = ud.preprocess_userdata(self.userdata_raw)
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return self.userdata
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def get_userdata_raw(self):
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return(self.userdata_raw)
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# the data sources' config_obj is a cloud-config formated
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# object that came to it from ways other than cloud-config
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# because cloud-config content would be handled elsewhere
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def get_config_obj(self):
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return({ })
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def get_public_ssh_keys(self):
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keys = []
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if not self.metadata.has_key('public-keys'): return([])
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for keyname, klist in self.metadata['public-keys'].items():
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# lp:506332 uec metadata service responds with
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# data that makes boto populate a string for 'klist' rather
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# than a list.
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if isinstance(klist,str):
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klist = [ klist ]
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for pkey in klist:
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# there is an empty string at the end of the keylist, trim it
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if pkey:
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keys.append(pkey)
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return(keys)
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def device_name_to_device(self, name):
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# translate a 'name' to a device
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# the primary function at this point is on ec2
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# to consult metadata service, that has
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# ephemeral0: sdb
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# and return 'sdb' for input 'ephemeral0'
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return(None)
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def get_locale(self):
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return('en_US.UTF-8')
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def get_local_mirror(self):
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return('http://archive.ubuntu.com/ubuntu/')
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def get_instance_id(self):
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if 'instance-id' not in self.metadata:
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return "ubuntuhost"
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return(self.metadata['instance-id'])
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def get_hostname(self):
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if not 'local-hostname' in self.metadata:
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return None
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toks = self.metadata['local-hostname'].split('.')
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# if there is an ipv4 address in 'local-hostname', then
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# make up a hostname (LP: #475354)
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if len(toks) == 4:
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try:
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r = filter(lambda x: int(x) < 256 and x > 0, toks)
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if len(r) == 4:
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return("ip-%s" % '-'.join(r))
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except: pass
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return toks[0]
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# return a list of classes that have the same depends as 'depends'
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# iterate through cfg_list, loading "DataSourceCollections" modules
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# and calling their "get_datasource_list".
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# return an ordered list of classes that match
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#
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# - modules must be named "DataSource<item>", where 'item' is an entry
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# in cfg_list
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# - if pkglist is given, it will iterate try loading from that package
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# ie, pkglist=[ "foo", "" ]
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# will first try to load foo.DataSource<item>
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# then DataSource<item>
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def list_sources(cfg_list, depends, pkglist=[]):
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retlist = []
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for ds_coll in cfg_list:
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for pkg in pkglist:
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if pkg: pkg="%s." % pkg
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try:
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mod = __import__("%sDataSource%s" % (pkg, ds_coll))
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if pkg:
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mod = getattr(mod, "DataSource%s" % ds_coll)
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lister = getattr(mod, "get_datasource_list")
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retlist.extend(lister(depends))
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break
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except:
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raise
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return(retlist)
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# depends is a list of dependencies (DEP_FILESYSTEM)
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# dslist is a list of 2 item lists
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# dslist = [
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# ( class, ( depends-that-this-class-needs ) )
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# }
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# it returns a list of 'class' that matched these deps exactly
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# it is a helper function for DataSourceCollections
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def list_from_depends(depends, dslist):
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retlist = [ ]
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depset = set(depends)
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for elem in dslist:
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(cls, deps) = elem
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if depset == set(deps):
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retlist.append(cls)
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return(retlist)
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