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name : DataSourceNoCloud.py # Copyright (C) 2009-2010 Canonical Ltd. # Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P. # Copyright (C) 2012 Yahoo! Inc. # # Author: Scott Moser <scott.moser@canonical.com> # Author: Juerg Hafliger <juerg.haefliger@hp.com> # Author: Joshua Harlow <harlowja@yahoo-inc.com> # # This file is part of cloud-init. See LICENSE file for license information. import errno import os from cloudinit import dmi from cloudinit import log as logging from cloudinit import sources, util from cloudinit.net import eni LOG = logging.getLogger(__name__) class DataSourceNoCloud(sources.DataSource): dsname = "NoCloud" def __init__(self, sys_cfg, distro, paths): sources.DataSource.__init__(self, sys_cfg, distro, paths) self.seed = None self.seed_dirs = [ os.path.join(paths.seed_dir, "nocloud"), os.path.join(paths.seed_dir, "nocloud-net"), ] self.seed_dir = None self.supported_seed_starts = ("/", "file://") def __str__(self): root = sources.DataSource.__str__(self) return "%s [seed=%s][dsmode=%s]" % (root, self.seed, self.dsmode) def _get_devices(self, label): fslist = util.find_devs_with("TYPE=vfat") fslist.extend(util.find_devs_with("TYPE=iso9660")) label_list = util.find_devs_with("LABEL=%s" % label.upper()) label_list.extend(util.find_devs_with("LABEL=%s" % label.lower())) label_list.extend(util.find_devs_with("LABEL_FATBOOT=%s" % label)) devlist = list(set(fslist) & set(label_list)) devlist.sort(reverse=True) return devlist def _get_data(self): defaults = { "instance-id": "nocloud", "dsmode": self.dsmode, } found = [] mydata = { "meta-data": {}, "user-data": "", "vendor-data": "", "network-config": None, } try: # Parse the system serial label from dmi. If not empty, try parsing # like the commandline md = {} serial = dmi.read_dmi_data("system-serial-number") if serial and load_cmdline_data(md, serial): found.append("dmi") mydata = _merge_new_seed(mydata, {"meta-data": md}) except Exception: util.logexc(LOG, "Unable to parse dmi data") return False try: # Parse the kernel command line, getting data passed in md = {} if load_cmdline_data(md): found.append("cmdline") mydata = _merge_new_seed(mydata, {"meta-data": md}) except Exception: util.logexc(LOG, "Unable to parse command line data") return False # Check to see if the seed dir has data. pp2d_kwargs = { "required": ["user-data", "meta-data"], "optional": ["vendor-data", "network-config"], } for path in self.seed_dirs: try: seeded = util.pathprefix2dict(path, **pp2d_kwargs) found.append(path) LOG.debug("Using seeded data from %s", path) mydata = _merge_new_seed(mydata, seeded) break except ValueError: pass # If the datasource config had a 'seedfrom' entry, then that takes # precedence over a 'seedfrom' that was found in a filesystem # but not over external media if self.ds_cfg.get("seedfrom"): found.append("ds_config_seedfrom") mydata["meta-data"]["seedfrom"] = self.ds_cfg["seedfrom"] # fields appropriately named can also just come from the datasource # config (ie, 'user-data', 'meta-data', 'vendor-data' there) if "user-data" in self.ds_cfg and "meta-data" in self.ds_cfg: mydata = _merge_new_seed(mydata, self.ds_cfg) found.append("ds_config") def _pp2d_callback(mp, data): return util.pathprefix2dict(mp, **data) label = self.ds_cfg.get("fs_label", "cidata") if label is not None: for dev in self._get_devices(label): try: LOG.debug("Attempting to use data from %s", dev) try: seeded = util.mount_cb( dev, _pp2d_callback, pp2d_kwargs ) except ValueError: LOG.warning( "device %s with label=%s not a valid seed.", dev, label, ) continue mydata = _merge_new_seed(mydata, seeded) LOG.debug("Using data from %s", dev) found.append(dev) break except OSError as e: if e.errno != errno.ENOENT: raise except util.MountFailedError: util.logexc( LOG, "Failed to mount %s when looking for data", dev ) # There was no indication on kernel cmdline or data # in the seeddir suggesting this handler should be used. if len(found) == 0: return False # The special argument "seedfrom" indicates we should # attempt to seed the userdata / metadata from its value # its primarily value is in allowing the user to type less # on the command line, ie: ds=nocloud;s=http://bit.ly/abcdefg/ if "seedfrom" in mydata["meta-data"]: seedfrom = mydata["meta-data"]["seedfrom"] seedfound = False for proto in self.supported_seed_starts: if seedfrom.startswith(proto): seedfound = proto break if not seedfound: LOG.debug("Seed from %s not supported by %s", seedfrom, self) return False # check and replace instances of known dmi.<dmi_keys> such as # chassis-serial-number or baseboard-product-name seedfrom = dmi.sub_dmi_vars(seedfrom) # This could throw errors, but the user told us to do it # so if errors are raised, let them raise (md_seed, ud, vd) = util.read_seeded(seedfrom, timeout=None) LOG.debug("Using seeded cache data from %s", seedfrom) # Values in the command line override those from the seed mydata["meta-data"] = util.mergemanydict( [mydata["meta-data"], md_seed] ) mydata["user-data"] = ud mydata["vendor-data"] = vd found.append(seedfrom) # Now that we have exhausted any other places merge in the defaults mydata["meta-data"] = util.mergemanydict( [mydata["meta-data"], defaults] ) self.dsmode = self._determine_dsmode( [mydata["meta-data"].get("dsmode")] ) if self.dsmode == sources.DSMODE_DISABLED: LOG.debug( "%s: not claiming datasource, dsmode=%s", self, self.dsmode ) return False self.seed = ",".join(found) self.metadata = mydata["meta-data"] self.userdata_raw = mydata["user-data"] self.vendordata_raw = mydata["vendor-data"] self._network_config = mydata["network-config"] self._network_eni = mydata["meta-data"].get("network-interfaces") return True @property def platform_type(self): # Handle upgrade path of pickled ds if not hasattr(self, "_platform_type"): self._platform_type = None if not self._platform_type: self._platform_type = "lxd" if util.is_lxd() else "nocloud" return self._platform_type def _get_cloud_name(self): """Return unknown when 'cloud-name' key is absent from metadata.""" return sources.METADATA_UNKNOWN def _get_subplatform(self): """Return the subplatform metadata source details.""" if self.seed.startswith("/dev"): subplatform_type = "config-disk" else: subplatform_type = "seed-dir" return "%s (%s)" % (subplatform_type, self.seed) def check_instance_id(self, sys_cfg): # quickly (local check only) if self.instance_id is still valid # we check kernel command line or files. current = self.get_instance_id() if not current: return None # LP: #1568150 need getattr in the case that an old class object # has been loaded from a pickled file and now executing new source. dirs = getattr(self, "seed_dirs", [self.seed_dir]) quick_id = _quick_read_instance_id(dirs=dirs) if not quick_id: return None return quick_id == current @property def network_config(self): if self._network_config is None: if self._network_eni is not None: self._network_config = eni.convert_eni_data(self._network_eni) return self._network_config def _quick_read_instance_id(dirs=None): if dirs is None: dirs = [] iid_key = "instance-id" fill = {} if load_cmdline_data(fill) and iid_key in fill: return fill[iid_key] for d in dirs: if d is None: continue try: data = util.pathprefix2dict(d, required=["meta-data"]) md = util.load_yaml(data["meta-data"]) if md and iid_key in md: return md[iid_key] except ValueError: pass return None def load_cmdline_data(fill, cmdline=None): pairs = [ ("ds=nocloud", sources.DSMODE_LOCAL), ("ds=nocloud-net", sources.DSMODE_NETWORK), ] for idstr, dsmode in pairs: if parse_cmdline_data(idstr, fill, cmdline): # if dsmode was explicitly in the command line, then # prefer it to the dsmode based on the command line id if "dsmode" not in fill: fill["dsmode"] = dsmode return True return False # Returns true or false indicating if cmdline indicated # that this module should be used. Updates dictionary 'fill' # with data that was found. # Example cmdline: # root=LABEL=uec-rootfs ro ds=nocloud def parse_cmdline_data(ds_id, fill, cmdline=None): if cmdline is None: cmdline = util.get_cmdline() cmdline = " %s " % cmdline if not (" %s " % ds_id in cmdline or " %s;" % ds_id in cmdline): return False argline = "" # cmdline can contain: # ds=nocloud[;key=val;key=val] for tok in cmdline.split(): if tok.startswith(ds_id): argline = tok.split("=", 1) # argline array is now 'nocloud' followed optionally by # a ';' and then key=value pairs also terminated with ';' tmp = argline[1].split(";") if len(tmp) > 1: kvpairs = tmp[1:] else: kvpairs = () # short2long mapping to save cmdline typing s2l = {"h": "local-hostname", "i": "instance-id", "s": "seedfrom"} for item in kvpairs: if item == "": continue try: (k, v) = item.split("=", 1) except Exception: k = item v = None if k in s2l: k = s2l[k] fill[k] = v return True def _merge_new_seed(cur, seeded): ret = cur.copy() newmd = seeded.get("meta-data", {}) if not isinstance(seeded["meta-data"], dict): newmd = util.load_yaml(seeded["meta-data"]) ret["meta-data"] = util.mergemanydict([cur["meta-data"], newmd]) if seeded.get("network-config"): ret["network-config"] = util.load_yaml(seeded.get("network-config")) if "user-data" in seeded: ret["user-data"] = seeded["user-data"] if "vendor-data" in seeded: ret["vendor-data"] = seeded["vendor-data"] return ret class DataSourceNoCloudNet(DataSourceNoCloud): def __init__(self, sys_cfg, distro, paths): DataSourceNoCloud.__init__(self, sys_cfg, distro, paths) self.supported_seed_starts = ("http://", "https://") # Used to match classes to dependencies datasources = [ (DataSourceNoCloud, (sources.DEP_FILESYSTEM,)), (DataSourceNoCloudNet, (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) # vi: ts=4 expandtab