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Edit File: DataSourceIBMCloud.py
# This file is part of cloud-init. See LICENSE file for license information. r"""Datasource for IBMCloud. IBMCloud is also know as SoftLayer or BlueMix. IBMCloud hypervisor is xen (2018-03-10). There are 2 different api exposed launch methods. * template: This is the legacy method of launching instances. When booting from an image template, the system boots first into a "provisioning" mode. There, host <-> guest mechanisms are utilized to execute code in the guest and configure it. The configuration includes configuring the system network and possibly installing packages and other software stack. After the provisioning is finished, the system reboots. * os_code: Essentially "launch by OS Code" (Operating System Code). This is a more modern approach. There is no specific "provisioning" boot. Instead, cloud-init does all the customization. With or without user-data provided, an OpenStack ConfigDrive like disk is attached. Only disks with label 'config-2' and UUID '9796-932E' are considered. This is to avoid this datasource claiming ConfigDrive. This does mean that 1 in 8^16 (~4 billion) Xen ConfigDrive systems will be incorrectly identified as IBMCloud. The combination of these 2 launch methods and with or without user-data creates 6 boot scenarios. A. os_code with user-data B. os_code without user-data Cloud-init is fully operational in this mode. There is a block device attached with label 'config-2'. As it differs from OpenStack's config-2, we have to differentiate. We do so by requiring the UUID on the filesystem to be "9796-932E". This disk will have the following files. Specifically note, there is no versioned path to the meta-data, only 'latest': openstack/latest/meta_data.json openstack/latest/network_data.json openstack/latest/user_data [optional] openstack/latest/vendor_data.json vendor_data.json as of 2018-04 looks like this: {"cloud-init":"#!/bin/bash\necho 'root:$6$<snip>' | chpasswd -e"} The only difference between A and B in this mode is the presence of user_data on the config disk. C. template, provisioning boot with user-data D. template, provisioning boot without user-data. With ds-identify cloud-init is fully disabled in this mode. Without ds-identify, cloud-init None datasource will be used. This is currently identified by the presence of /root/provisioningConfiguration.cfg . That file is placed into the system before it is booted. The difference between C and D is the presence of the METADATA disk as described in E below. There is no METADATA disk attached unless user-data is provided. E. template, post-provisioning boot with user-data. Cloud-init is fully operational in this mode. This is identified by a block device with filesystem label "METADATA". The looks similar to a version-1 OpenStack config drive. It will have the following files: openstack/latest/user_data openstack/latest/meta_data.json openstack/content/interfaces meta.js meta.js contains something similar to user_data. cloud-init ignores it. cloud-init ignores the 'interfaces' style file here. In this mode, cloud-init has networking code disabled. It relies on the provisioning boot to have configured networking. F. template, post-provisioning boot without user-data. With ds-identify, cloud-init will be fully disabled. Without ds-identify, cloud-init None datasource will be used. There is no information available to identify this scenario. The user will be able to SSH in as as root with their public keys that have been installed into /root/ssh/.authorized_keys during the provisioning stage. TODO: * is uuid (/sys/hypervisor/uuid) stable for life of an instance? it seems it is not the same as data's uuid in the os_code case but is in the template case. """ import base64 import json import logging import os from typing import Any, Callable, Dict, Optional, Tuple from cloudinit import atomic_helper, sources, subp, util from cloudinit.sources.helpers import openstack LOG = logging.getLogger(__name__) IBM_CONFIG_UUID = "9796-932E" class Platforms: TEMPLATE_LIVE_METADATA = "Template/Live/Metadata" TEMPLATE_PROVISIONING_METADATA = "Template/Provisioning/Metadata" TEMPLATE_PROVISIONING_NODATA = "Template/Provisioning/No-Metadata" OS_CODE = "OS-Code/Live" PROVISIONING = ( Platforms.TEMPLATE_PROVISIONING_METADATA, Platforms.TEMPLATE_PROVISIONING_NODATA, ) class DataSourceIBMCloud(sources.DataSource): dsname = "IBMCloud" system_uuid = None def __init__(self, sys_cfg, distro, paths): super(DataSourceIBMCloud, self).__init__(sys_cfg, distro, paths) self.source = None self._network_config = None self.network_json = None self.platform = None def __str__(self): root = super(DataSourceIBMCloud, self).__str__() mstr = "%s [%s %s]" % (root, self.platform, self.source) return mstr def _get_data(self): results = read_md() if results is None: return False self.source = results["source"] self.platform = results["platform"] self.metadata = results["metadata"] self.userdata_raw = results.get("userdata") self.network_json = results.get("networkdata") vd = results.get("vendordata") self.system_uuid = results["system-uuid"] try: self.vendordata_raw = sources.convert_vendordata(vd) except ValueError as e: LOG.warning("Invalid content in vendor-data: %s", e) self.vendordata_raw = None return True def _get_subplatform(self): """Return the subplatform metadata source details.""" return "%s (%s)" % (self.platform, self.source) def check_instance_id(self, sys_cfg): """quickly (local check only) if self.instance_id is still valid in Template mode, the system uuid (/sys/hypervisor/uuid) is the same as found in the METADATA disk. But that is not true in OS_CODE mode. So we read the system_uuid and keep that for later compare.""" if self.system_uuid is None: return False return self.system_uuid == _read_system_uuid() @property def network_config(self): if self.platform != Platforms.OS_CODE: # If deployed from template, an agent in the provisioning # environment handles networking configuration. Not cloud-init. return {"config": "disabled", "version": 1} if self._network_config is None: if self.network_json not in (sources.UNSET, None): LOG.debug("network config provided via network_json") self._network_config = openstack.convert_net_json( self.network_json, known_macs=None ) else: LOG.debug("no network configuration available.") return self._network_config def _read_system_uuid() -> Optional[str]: """ Read the system uuid. :return: the system uuid or None if not available. """ uuid_path = "/sys/hypervisor/uuid" if not os.path.isfile(uuid_path): return None return util.load_text_file(uuid_path).strip().lower() def _is_xen(): """ Return boolean indicating if this is a xen hypervisor. :return: True if this is a xen hypervisor, False otherwise. """ return os.path.exists("/proc/xen") def _is_ibm_provisioning( prov_cfg="/root/provisioningConfiguration.cfg", inst_log="/root/swinstall.log", boot_ref="/proc/1/environ", ) -> bool: """Return boolean indicating if this boot is ibm provisioning boot.""" if os.path.exists(prov_cfg): msg = "config '%s' exists." % prov_cfg result = True if os.path.exists(inst_log): if os.path.exists(boot_ref): result = ( os.stat(inst_log).st_mtime > os.stat(boot_ref).st_mtime ) msg += " log '%s' from %s boot." % ( inst_log, "current" if result else "previous", ) else: msg += " log '%s' existed, but no reference file '%s'." % ( inst_log, boot_ref, ) result = False else: msg += " log '%s' did not exist." % inst_log else: result, msg = (False, "config '%s' did not exist." % prov_cfg) LOG.debug("ibm_provisioning=%s: %s", result, msg) return result def get_ibm_platform() -> Tuple[Optional[str], Optional[str]]: """Return a tuple (Platform, path) If this is Not IBM cloud, then the return value is (None, None). An instance in provisioning mode is considered running on IBM cloud.""" label_mdata = "METADATA" label_cfg2 = "CONFIG-2" not_found = (None, None) if not _is_xen(): return not_found # fslabels contains only the first entry with a given label. fslabels: Dict[str, Dict] = {} try: devs = util.blkid() except subp.ProcessExecutionError as e: LOG.warning("Failed to run blkid: %s", e) return (None, None) for dev in sorted(devs.keys()): data = devs[dev] label = data.get("LABEL", "").upper() uuid = data.get("UUID", "").upper() if label not in (label_mdata, label_cfg2): continue if label in fslabels: LOG.warning( "Duplicate fslabel '%s'. existing=%s current=%s", label, fslabels[label], data, ) continue if label == label_cfg2 and uuid != IBM_CONFIG_UUID: LOG.debug( "Skipping %s with LABEL=%s due to uuid != %s: %s", dev, label, uuid, data, ) continue fslabels[label] = data metadata_path = fslabels.get(label_mdata, {}).get("DEVNAME") cfg2_path = fslabels.get(label_cfg2, {}).get("DEVNAME") if cfg2_path: return (Platforms.OS_CODE, cfg2_path) elif metadata_path: if _is_ibm_provisioning(): return (Platforms.TEMPLATE_PROVISIONING_METADATA, metadata_path) else: return (Platforms.TEMPLATE_LIVE_METADATA, metadata_path) elif _is_ibm_provisioning(): return (Platforms.TEMPLATE_PROVISIONING_NODATA, None) return not_found def read_md() -> Optional[Dict[str, Any]]: """Read data from IBM Cloud. :return: None if not running on IBM Cloud. dictionary with guaranteed fields: metadata, version and optional fields: userdata, vendordata, networkdata. Also includes the system uuid from /sys/hypervisor/uuid.""" platform, path = get_ibm_platform() if platform is None: LOG.debug("This is not an IBMCloud platform.") return None elif platform in PROVISIONING or path is None: LOG.debug("Cloud-init is disabled during provisioning: %s.", platform) return None ret = { "platform": platform, "source": path, "system-uuid": _read_system_uuid(), } try: if os.path.isdir(path): results = metadata_from_dir(path) else: results = util.mount_cb(path, metadata_from_dir) except sources.BrokenMetadata as e: raise RuntimeError( "Failed reading IBM config disk (platform=%s path=%s): %s" % (platform, path, e) ) from e ret.update(results) return ret def metadata_from_dir(source_dir: str) -> Dict[str, Any]: """Walk source_dir extracting standardized metadata. Certain metadata keys are renamed to present a standardized set of metadata keys. This function has a lot in common with ConfigDriveReader.read_v2 but there are a number of inconsistencies, such as key renames and only presenting a 'latest' version, which make it an unlikely candidate to share code. :return: Dict containing translated metadata, userdata, vendordata, networkdata as present. """ def opath(fname: str) -> str: return os.path.join("openstack", "latest", fname) def load_json_bytes(blob: bytes) -> Dict[str, Any]: """ Load JSON from a byte string. This technically could return a list or a str, but we are only assuming a dict here. :param blob: The byte string to load JSON from. :return: The loaded JSON object. """ return json.loads(blob.decode("utf-8")) def load_file(path: str, translator: Callable[[bytes], Any]) -> Any: try: raw = util.load_binary_file(path) return translator(raw) except IOError as e: LOG.debug("Failed reading path '%s': %s", path, e) return None except Exception as e: raise sources.BrokenMetadata(f"Failed decoding {path}: {e}") files = [ # tuples of (results_name, path, translator) ("metadata_raw", opath("meta_data.json"), load_json_bytes), ("userdata", opath("user_data"), lambda x: x), ("vendordata", opath("vendor_data.json"), load_json_bytes), ("networkdata", opath("network_data.json"), load_json_bytes), ] results: Dict[str, Any] = {} for name, path, transl in files: fpath = os.path.join(source_dir, path) results[name] = load_file(fpath, transl) if results["metadata_raw"] is None: raise sources.BrokenMetadata( f"{source_dir} missing required file 'meta_data.json'", ) results["metadata"] = {} md_raw = results["metadata_raw"] md = results["metadata"] if "random_seed" in md_raw: try: md["random_seed"] = base64.b64decode(md_raw["random_seed"]) except (ValueError, TypeError) as e: raise sources.BrokenMetadata( f"Badly formatted metadata random_seed entry: {e}" ) renames = ( ("public_keys", "public-keys"), ("hostname", "local-hostname"), ("uuid", "instance-id"), ) for old_key, new_key in renames: if old_key in md_raw: md[new_key] = md_raw[old_key] return results # Used to match classes to dependencies datasources = [ (DataSourceIBMCloud, (sources.DEP_FILESYSTEM,)), ] # Return a list of data sources that match this set of dependencies def get_datasource_list(depends): return sources.list_from_depends(depends, datasources) if __name__ == "__main__": import argparse parser = argparse.ArgumentParser(description="Query IBM Cloud Metadata") args = parser.parse_args() data = read_md() print(atomic_helper.json_dumps(data))