# Copyright (C) 2013 Canonical Ltd. # # Author: Scott Moser # # This file is part of cloud-init. See LICENSE file for license information. import base64 import contextlib import crypt from functools import partial import os import os.path import re from time import time from xml.dom import minidom import xml.etree.ElementTree as ET from cloudinit import log as logging from cloudinit import net from cloudinit.event import EventType from cloudinit.net import device_driver from cloudinit.net.dhcp import EphemeralDHCPv4 from cloudinit import sources from cloudinit.sources.helpers import netlink from cloudinit import subp from cloudinit.url_helper import UrlError, readurl, retry_on_url_exc from cloudinit import util from cloudinit.reporting import events from cloudinit.sources.helpers.azure import ( azure_ds_reporter, azure_ds_telemetry_reporter, get_metadata_from_fabric, get_boot_telemetry, get_system_info, report_diagnostic_event, EphemeralDHCPv4WithReporting, is_byte_swapped, dhcp_log_cb, push_log_to_kvp) LOG = logging.getLogger(__name__) DS_NAME = 'Azure' DEFAULT_METADATA = {"instance-id": "iid-AZURE-NODE"} AGENT_START = ['service', 'walinuxagent', 'start'] AGENT_START_BUILTIN = "__builtin__" BOUNCE_COMMAND_IFUP = [ 'sh', '-xc', "i=$interface; x=0; ifdown $i || x=$?; ifup $i || x=$?; exit $x" ] BOUNCE_COMMAND_FREEBSD = [ 'sh', '-xc', ("i=$interface; x=0; ifconfig down $i || x=$?; " "ifconfig up $i || x=$?; exit $x") ] # azure systems will always have a resource disk, and 66-azure-ephemeral.rules # ensures that it gets linked to this path. RESOURCE_DISK_PATH = '/dev/disk/cloud/azure_resource' DEFAULT_PRIMARY_NIC = 'eth0' LEASE_FILE = '/var/lib/dhcp/dhclient.eth0.leases' DEFAULT_FS = 'ext4' # DMI chassis-asset-tag is set static for all azure instances AZURE_CHASSIS_ASSET_TAG = '7783-7084-3265-9085-8269-3286-77' REPROVISION_MARKER_FILE = "/var/lib/cloud/data/poll_imds" REPORTED_READY_MARKER_FILE = "/var/lib/cloud/data/reported_ready" AGENT_SEED_DIR = '/var/lib/waagent' # In the event where the IMDS primary server is not # available, it takes 1s to fallback to the secondary one IMDS_TIMEOUT_IN_SECONDS = 2 IMDS_URL = "http://169.254.169.254/metadata/" PLATFORM_ENTROPY_SOURCE = "/sys/firmware/acpi/tables/OEM0" # List of static scripts and network config artifacts created by # stock ubuntu suported images. UBUNTU_EXTENDED_NETWORK_SCRIPTS = [ '/etc/netplan/90-hotplug-azure.yaml', '/usr/local/sbin/ephemeral_eth.sh', '/etc/udev/rules.d/10-net-device-added.rules', '/run/network/interfaces.ephemeral.d', ] def find_storvscid_from_sysctl_pnpinfo(sysctl_out, deviceid): # extract the 'X' from dev.storvsc.X. if deviceid matches """ dev.storvsc.1.%pnpinfo: classid=32412632-86cb-44a2-9b5c-50d1417354f5 deviceid=00000000-0001-8899-0000-000000000000 """ for line in sysctl_out.splitlines(): if re.search(r"pnpinfo", line): fields = line.split() if len(fields) >= 3: columns = fields[2].split('=') if (len(columns) >= 2 and columns[0] == "deviceid" and columns[1].startswith(deviceid)): comps = fields[0].split('.') return comps[2] return None def find_busdev_from_disk(camcontrol_out, disk_drv): # find the scbusX from 'camcontrol devlist -b' output # if disk_drv matches the specified disk driver, i.e. blkvsc1 """ scbus0 on ata0 bus 0 scbus1 on ata1 bus 0 scbus2 on blkvsc0 bus 0 scbus3 on blkvsc1 bus 0 scbus4 on storvsc2 bus 0 scbus5 on storvsc3 bus 0 scbus-1 on xpt0 bus 0 """ for line in camcontrol_out.splitlines(): if re.search(disk_drv, line): items = line.split() return items[0] return None def find_dev_from_busdev(camcontrol_out, busdev): # find the daX from 'camcontrol devlist' output # if busdev matches the specified value, i.e. 'scbus2' """ at scbus1 target 0 lun 0 (cd0,pass0) at scbus2 target 0 lun 0 (da0,pass1) at scbus3 target 1 lun 0 (da1,pass2) """ for line in camcontrol_out.splitlines(): if re.search(busdev, line): items = line.split('(') if len(items) == 2: dev_pass = items[1].split(',') return dev_pass[0] return None def execute_or_debug(cmd, fail_ret=None): try: return subp.subp(cmd)[0] except subp.ProcessExecutionError: LOG.debug("Failed to execute: %s", ' '.join(cmd)) return fail_ret def get_dev_storvsc_sysctl(): return execute_or_debug(["sysctl", "dev.storvsc"], fail_ret="") def get_camcontrol_dev_bus(): return execute_or_debug(['camcontrol', 'devlist', '-b']) def get_camcontrol_dev(): return execute_or_debug(['camcontrol', 'devlist']) def get_resource_disk_on_freebsd(port_id): g0 = "00000000" if port_id > 1: g0 = "00000001" port_id = port_id - 2 g1 = "000" + str(port_id) g0g1 = "{0}-{1}".format(g0, g1) # search 'X' from # 'dev.storvsc.X.%pnpinfo: # classid=32412632-86cb-44a2-9b5c-50d1417354f5 # deviceid=00000000-0001-8899-0000-000000000000' sysctl_out = get_dev_storvsc_sysctl() storvscid = find_storvscid_from_sysctl_pnpinfo(sysctl_out, g0g1) if not storvscid: LOG.debug("Fail to find storvsc id from sysctl") return None camcontrol_b_out = get_camcontrol_dev_bus() camcontrol_out = get_camcontrol_dev() # try to find /dev/XX from 'blkvsc' device blkvsc = "blkvsc{0}".format(storvscid) scbusx = find_busdev_from_disk(camcontrol_b_out, blkvsc) if scbusx: devname = find_dev_from_busdev(camcontrol_out, scbusx) if devname is None: LOG.debug("Fail to find /dev/daX") return None return devname # try to find /dev/XX from 'storvsc' device storvsc = "storvsc{0}".format(storvscid) scbusx = find_busdev_from_disk(camcontrol_b_out, storvsc) if scbusx: devname = find_dev_from_busdev(camcontrol_out, scbusx) if devname is None: LOG.debug("Fail to find /dev/daX") return None return devname return None # update the FreeBSD specific information if util.is_FreeBSD(): DEFAULT_PRIMARY_NIC = 'hn0' LEASE_FILE = '/var/db/dhclient.leases.hn0' DEFAULT_FS = 'freebsd-ufs' res_disk = get_resource_disk_on_freebsd(1) if res_disk is not None: LOG.debug("resource disk is not None") RESOURCE_DISK_PATH = "/dev/" + res_disk else: LOG.debug("resource disk is None") # TODO Find where platform entropy data is surfaced PLATFORM_ENTROPY_SOURCE = None BUILTIN_DS_CONFIG = { 'agent_command': AGENT_START_BUILTIN, 'data_dir': AGENT_SEED_DIR, 'set_hostname': True, 'hostname_bounce': { 'interface': DEFAULT_PRIMARY_NIC, 'policy': True, 'command': 'builtin', 'hostname_command': 'hostname', }, 'disk_aliases': {'ephemeral0': RESOURCE_DISK_PATH}, 'dhclient_lease_file': LEASE_FILE, 'apply_network_config': True, # Use IMDS published network configuration } # RELEASE_BLOCKER: Xenial and earlier apply_network_config default is False BUILTIN_CLOUD_CONFIG = { 'disk_setup': { 'ephemeral0': {'table_type': 'gpt', 'layout': [100], 'overwrite': True}, }, 'fs_setup': [{'filesystem': DEFAULT_FS, 'device': 'ephemeral0.1'}], } DS_CFG_PATH = ['datasource', DS_NAME] DS_CFG_KEY_PRESERVE_NTFS = 'never_destroy_ntfs' DEF_EPHEMERAL_LABEL = 'Temporary Storage' # The redacted password fails to meet password complexity requirements # so we can safely use this to mask/redact the password in the ovf-env.xml DEF_PASSWD_REDACTION = 'REDACTED' def get_hostname(hostname_command='hostname'): if not isinstance(hostname_command, (list, tuple)): hostname_command = (hostname_command,) return subp.subp(hostname_command, capture=True)[0].strip() def set_hostname(hostname, hostname_command='hostname'): subp.subp([hostname_command, hostname]) @azure_ds_telemetry_reporter @contextlib.contextmanager def temporary_hostname(temp_hostname, cfg, hostname_command='hostname'): """ Set a temporary hostname, restoring the previous hostname on exit. Will have the value of the previous hostname when used as a context manager, or None if the hostname was not changed. """ policy = cfg['hostname_bounce']['policy'] previous_hostname = get_hostname(hostname_command) if (not util.is_true(cfg.get('set_hostname')) or util.is_false(policy) or (previous_hostname == temp_hostname and policy != 'force')): yield None return try: set_hostname(temp_hostname, hostname_command) except Exception as e: msg = 'Failed setting temporary hostname: %s' % e report_diagnostic_event(msg) LOG.warning(msg) yield None return try: yield previous_hostname finally: set_hostname(previous_hostname, hostname_command) class DataSourceAzure(sources.DataSource): dsname = 'Azure' _negotiated = False _metadata_imds = sources.UNSET def __init__(self, sys_cfg, distro, paths): sources.DataSource.__init__(self, sys_cfg, distro, paths) self.seed_dir = os.path.join(paths.seed_dir, 'azure') self.cfg = {} self.seed = None self.ds_cfg = util.mergemanydict([ util.get_cfg_by_path(sys_cfg, DS_CFG_PATH, {}), BUILTIN_DS_CONFIG]) self.dhclient_lease_file = self.ds_cfg.get('dhclient_lease_file') self._network_config = None # Regenerate network config new_instance boot and every boot self.update_events['network'].add(EventType.BOOT) self._ephemeral_dhcp_ctx = None def __str__(self): root = sources.DataSource.__str__(self) return "%s [seed=%s]" % (root, self.seed) @azure_ds_telemetry_reporter def bounce_network_with_azure_hostname(self): # When using cloud-init to provision, we have to set the hostname from # the metadata and "bounce" the network to force DDNS to update via # dhclient azure_hostname = self.metadata.get('local-hostname') LOG.debug("Hostname in metadata is %s", azure_hostname) hostname_command = self.ds_cfg['hostname_bounce']['hostname_command'] with temporary_hostname(azure_hostname, self.ds_cfg, hostname_command=hostname_command) \ as previous_hn: if (previous_hn is not None and util.is_true(self.ds_cfg.get('set_hostname'))): cfg = self.ds_cfg['hostname_bounce'] # "Bouncing" the network try: return perform_hostname_bounce(hostname=azure_hostname, cfg=cfg, prev_hostname=previous_hn) except Exception as e: LOG.warning("Failed publishing hostname: %s", e) util.logexc(LOG, "handling set_hostname failed") return False @azure_ds_telemetry_reporter def get_metadata_from_agent(self): temp_hostname = self.metadata.get('local-hostname') agent_cmd = self.ds_cfg['agent_command'] LOG.debug("Getting metadata via agent. hostname=%s cmd=%s", temp_hostname, agent_cmd) self.bounce_network_with_azure_hostname() try: invoke_agent(agent_cmd) except subp.ProcessExecutionError: # claim the datasource even if the command failed util.logexc(LOG, "agent command '%s' failed.", self.ds_cfg['agent_command']) ddir = self.ds_cfg['data_dir'] fp_files = [] key_value = None for pk in self.cfg.get('_pubkeys', []): if pk.get('value', None): key_value = pk['value'] LOG.debug("SSH authentication: using value from fabric") else: bname = str(pk['fingerprint'] + ".crt") fp_files += [os.path.join(ddir, bname)] LOG.debug("SSH authentication: " "using fingerprint from fabric") with events.ReportEventStack( name="waiting-for-ssh-public-key", description="wait for agents to retrieve SSH keys", parent=azure_ds_reporter): # wait very long for public SSH keys to arrive # https://bugs.launchpad.net/cloud-init/+bug/1717611 missing = util.log_time(logfunc=LOG.debug, msg="waiting for SSH public key files", func=util.wait_for_files, args=(fp_files, 900)) if len(missing): LOG.warning("Did not find files, but going on: %s", missing) metadata = {} metadata['public-keys'] = key_value or pubkeys_from_crt_files(fp_files) return metadata 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) @azure_ds_telemetry_reporter def crawl_metadata(self): """Walk all instance metadata sources returning a dict on success. @return: A dictionary of any metadata content for this instance. @raise: InvalidMetaDataException when the expected metadata service is unavailable, broken or disabled. """ crawled_data = {} # azure removes/ejects the cdrom containing the ovf-env.xml # file on reboot. So, in order to successfully reboot we # need to look in the datadir and consider that valid ddir = self.ds_cfg['data_dir'] candidates = [self.seed_dir] if os.path.isfile(REPROVISION_MARKER_FILE): candidates.insert(0, "IMDS") candidates.extend(list_possible_azure_ds_devs()) if ddir: candidates.append(ddir) found = None reprovision = False for cdev in candidates: try: if cdev == "IMDS": ret = None reprovision = True elif cdev.startswith("/dev/"): if util.is_FreeBSD(): ret = util.mount_cb(cdev, load_azure_ds_dir, mtype="udf") else: ret = util.mount_cb(cdev, load_azure_ds_dir) else: ret = load_azure_ds_dir(cdev) except NonAzureDataSource: report_diagnostic_event( "Did not find Azure data source in %s" % cdev) continue except BrokenAzureDataSource as exc: msg = 'BrokenAzureDataSource: %s' % exc report_diagnostic_event(msg) raise sources.InvalidMetaDataException(msg) except util.MountFailedError: msg = '%s was not mountable' % cdev report_diagnostic_event(msg) LOG.warning(msg) continue perform_reprovision = reprovision or self._should_reprovision(ret) if perform_reprovision: if util.is_FreeBSD(): msg = "Free BSD is not supported for PPS VMs" LOG.error(msg) report_diagnostic_event(msg) raise sources.InvalidMetaDataException(msg) ret = self._reprovision() imds_md = get_metadata_from_imds( self.fallback_interface, retries=10) (md, userdata_raw, cfg, files) = ret self.seed = cdev crawled_data.update({ 'cfg': cfg, 'files': files, 'metadata': util.mergemanydict( [md, {'imds': imds_md}]), 'userdata_raw': userdata_raw}) found = cdev LOG.debug("found datasource in %s", cdev) break if not found: msg = 'No Azure metadata found' report_diagnostic_event(msg) raise sources.InvalidMetaDataException(msg) if found == ddir: LOG.debug("using files cached in %s", ddir) seed = _get_random_seed() if seed: crawled_data['metadata']['random_seed'] = seed crawled_data['metadata']['instance-id'] = self._iid() if perform_reprovision: LOG.info("Reporting ready to Azure after getting ReprovisionData") use_cached_ephemeral = (net.is_up(self.fallback_interface) and getattr(self, '_ephemeral_dhcp_ctx', None)) if use_cached_ephemeral: self._report_ready(lease=self._ephemeral_dhcp_ctx.lease) self._ephemeral_dhcp_ctx.clean_network() # Teardown ephemeral else: try: with EphemeralDHCPv4WithReporting( azure_ds_reporter) as lease: self._report_ready(lease=lease) except Exception as e: report_diagnostic_event( "exception while reporting ready: %s" % e) raise return crawled_data def _is_platform_viable(self): """Check platform environment to report if this datasource may run.""" return _is_platform_viable(self.seed_dir) def clear_cached_attrs(self, attr_defaults=()): """Reset any cached class attributes to defaults.""" super(DataSourceAzure, self).clear_cached_attrs(attr_defaults) self._metadata_imds = sources.UNSET @azure_ds_telemetry_reporter def _get_data(self): """Crawl and process datasource metadata caching metadata as attrs. @return: True on success, False on error, invalid or disabled datasource. """ if not self._is_platform_viable(): return False try: get_boot_telemetry() except Exception as e: LOG.warning("Failed to get boot telemetry: %s", e) try: get_system_info() except Exception as e: LOG.warning("Failed to get system information: %s", e) try: crawled_data = util.log_time( logfunc=LOG.debug, msg='Crawl of metadata service', func=self.crawl_metadata ) except sources.InvalidMetaDataException as e: LOG.warning('Could not crawl Azure metadata: %s', e) return False if (self.distro and self.distro.name == 'ubuntu' and self.ds_cfg.get('apply_network_config')): maybe_remove_ubuntu_network_config_scripts() # Process crawled data and augment with various config defaults self.cfg = util.mergemanydict( [crawled_data['cfg'], BUILTIN_CLOUD_CONFIG]) self._metadata_imds = crawled_data['metadata']['imds'] self.metadata = util.mergemanydict( [crawled_data['metadata'], DEFAULT_METADATA]) self.userdata_raw = crawled_data['userdata_raw'] user_ds_cfg = util.get_cfg_by_path(self.cfg, DS_CFG_PATH, {}) self.ds_cfg = util.mergemanydict([user_ds_cfg, self.ds_cfg]) # walinux agent writes files world readable, but expects # the directory to be protected. write_files( self.ds_cfg['data_dir'], crawled_data['files'], dirmode=0o700) return True def device_name_to_device(self, name): return self.ds_cfg['disk_aliases'].get(name) @azure_ds_telemetry_reporter def get_public_ssh_keys(self): """ Try to get the ssh keys from IMDS first, and if that fails (i.e. IMDS is unavailable) then fallback to getting the ssh keys from OVF. The benefit to getting keys from IMDS is a large performance advantage, so this is a strong preference. But we must keep OVF as a second option for environments that don't have IMDS. """ LOG.debug('Retrieving public SSH keys') ssh_keys = [] try: ssh_keys = [ public_key['keyData'] for public_key in self.metadata['imds']['compute']['publicKeys'] ] LOG.debug('Retrieved SSH keys from IMDS') except KeyError: log_msg = 'Unable to get keys from IMDS, falling back to OVF' LOG.debug(log_msg) report_diagnostic_event(log_msg) try: ssh_keys = self.metadata['public-keys'] LOG.debug('Retrieved keys from OVF') except KeyError: log_msg = 'No keys available from OVF' LOG.debug(log_msg) report_diagnostic_event(log_msg) return ssh_keys def get_config_obj(self): return self.cfg def check_instance_id(self, sys_cfg): # quickly (local check only) if self.instance_id is still valid return sources.instance_id_matches_system_uuid(self.get_instance_id()) def _iid(self, previous=None): prev_iid_path = os.path.join( self.paths.get_cpath('data'), 'instance-id') iid = util.read_dmi_data('system-uuid') if os.path.exists(prev_iid_path): previous = util.load_file(prev_iid_path).strip() if is_byte_swapped(previous, iid): return previous return iid @azure_ds_telemetry_reporter def setup(self, is_new_instance): if self._negotiated is False: LOG.debug("negotiating for %s (new_instance=%s)", self.get_instance_id(), is_new_instance) fabric_data = self._negotiate() LOG.debug("negotiating returned %s", fabric_data) if fabric_data: self.metadata.update(fabric_data) self._negotiated = True else: LOG.debug("negotiating already done for %s", self.get_instance_id()) def _poll_imds(self): """Poll IMDS for the new provisioning data until we get a valid response. Then return the returned JSON object.""" url = IMDS_URL + "reprovisiondata?api-version=2017-04-02" headers = {"Metadata": "true"} nl_sock = None report_ready = bool(not os.path.isfile(REPORTED_READY_MARKER_FILE)) self.imds_logging_threshold = 1 self.imds_poll_counter = 1 dhcp_attempts = 0 vnet_switched = False return_val = None def exc_cb(msg, exception): if isinstance(exception, UrlError): if exception.code in (404, 410): if self.imds_poll_counter == self.imds_logging_threshold: # Reducing the logging frequency as we are polling IMDS self.imds_logging_threshold *= 2 LOG.debug("Call to IMDS with arguments %s failed " "with status code %s after %s retries", msg, exception.code, self.imds_poll_counter) LOG.debug("Backing off logging threshold for the same " "exception to %d", self.imds_logging_threshold) report_diagnostic_event("poll IMDS with %s failed. " "Exception: %s and code: %s" % (msg, exception.cause, exception.code)) self.imds_poll_counter += 1 return True else: # If we get an exception while trying to call IMDS, we call # DHCP and setup the ephemeral network to acquire a new IP. report_diagnostic_event("poll IMDS with %s failed. " "Exception: %s and code: %s" % (msg, exception.cause, exception.code)) return False LOG.debug("poll IMDS failed with an unexpected exception: %s", exception) return False LOG.debug("Wait for vnetswitch to happen") while True: try: # Save our EphemeralDHCPv4 context to avoid repeated dhcp with events.ReportEventStack( name="obtain-dhcp-lease", description="obtain dhcp lease", parent=azure_ds_reporter): self._ephemeral_dhcp_ctx = EphemeralDHCPv4( dhcp_log_func=dhcp_log_cb) lease = self._ephemeral_dhcp_ctx.obtain_lease() if vnet_switched: dhcp_attempts += 1 if report_ready: try: nl_sock = netlink.create_bound_netlink_socket() except netlink.NetlinkCreateSocketError as e: report_diagnostic_event(e) LOG.warning(e) self._ephemeral_dhcp_ctx.clean_network() break path = REPORTED_READY_MARKER_FILE LOG.info( "Creating a marker file to report ready: %s", path) util.write_file(path, "{pid}: {time}\n".format( pid=os.getpid(), time=time())) self._report_ready(lease=lease) report_ready = False with events.ReportEventStack( name="wait-for-media-disconnect-connect", description="wait for vnet switch", parent=azure_ds_reporter): try: netlink.wait_for_media_disconnect_connect( nl_sock, lease['interface']) except AssertionError as error: report_diagnostic_event(error) LOG.error(error) break vnet_switched = True self._ephemeral_dhcp_ctx.clean_network() else: with events.ReportEventStack( name="get-reprovision-data-from-imds", description="get reprovision data from imds", parent=azure_ds_reporter): return_val = readurl(url, timeout=IMDS_TIMEOUT_IN_SECONDS, headers=headers, exception_cb=exc_cb, infinite=True, log_req_resp=False).contents break except UrlError: # Teardown our EphemeralDHCPv4 context on failure as we retry self._ephemeral_dhcp_ctx.clean_network() finally: if nl_sock: nl_sock.close() if vnet_switched: report_diagnostic_event("attempted dhcp %d times after reuse" % dhcp_attempts) report_diagnostic_event("polled imds %d times after reuse" % self.imds_poll_counter) return return_val @azure_ds_telemetry_reporter def _report_ready(self, lease): """Tells the fabric provisioning has completed """ try: get_metadata_from_fabric(None, lease['unknown-245']) except Exception: LOG.warning( "Error communicating with Azure fabric; You may experience." "connectivity issues.", exc_info=True) def _should_reprovision(self, ret): """Whether or not we should poll IMDS for reprovisioning data. Also sets a marker file to poll IMDS. The marker file is used for the following scenario: the VM boots into this polling loop, which we expect to be proceeding infinitely until the VM is picked. If for whatever reason the platform moves us to a new host (for instance a hardware issue), we need to keep polling. However, since the VM reports ready to the Fabric, we will not attach the ISO, thus cloud-init needs to have a way of knowing that it should jump back into the polling loop in order to retrieve the ovf_env.""" if not ret: return False (_md, _userdata_raw, cfg, _files) = ret path = REPROVISION_MARKER_FILE if (cfg.get('PreprovisionedVm') is True or os.path.isfile(path)): if not os.path.isfile(path): LOG.info("Creating a marker file to poll imds: %s", path) util.write_file(path, "{pid}: {time}\n".format( pid=os.getpid(), time=time())) return True return False def _reprovision(self): """Initiate the reprovisioning workflow.""" contents = self._poll_imds() with events.ReportEventStack( name="reprovisioning-read-azure-ovf", description="read azure ovf during reprovisioning", parent=azure_ds_reporter): md, ud, cfg = read_azure_ovf(contents) return (md, ud, cfg, {'ovf-env.xml': contents}) @azure_ds_telemetry_reporter def _negotiate(self): """Negotiate with fabric and return data from it. On success, returns a dictionary including 'public_keys'. On failure, returns False. """ if self.ds_cfg['agent_command'] == AGENT_START_BUILTIN: self.bounce_network_with_azure_hostname() pubkey_info = None try: public_keys = self.metadata['imds']['compute']['publicKeys'] LOG.debug( 'Successfully retrieved %s key(s) from IMDS', len(public_keys) if public_keys is not None else 0 ) except KeyError: LOG.debug( 'Unable to retrieve SSH keys from IMDS during ' 'negotiation, falling back to OVF' ) pubkey_info = self.cfg.get('_pubkeys', None) metadata_func = partial(get_metadata_from_fabric, fallback_lease_file=self. dhclient_lease_file, pubkey_info=pubkey_info) else: metadata_func = self.get_metadata_from_agent LOG.debug("negotiating with fabric via agent command %s", self.ds_cfg['agent_command']) try: fabric_data = metadata_func() except Exception as e: report_diagnostic_event( "Error communicating with Azure fabric; You may experience " "connectivity issues: %s" % e) LOG.warning( "Error communicating with Azure fabric; You may experience " "connectivity issues.", exc_info=True) return False util.del_file(REPORTED_READY_MARKER_FILE) util.del_file(REPROVISION_MARKER_FILE) return fabric_data @azure_ds_telemetry_reporter def activate(self, cfg, is_new_instance): try: address_ephemeral_resize(is_new_instance=is_new_instance, preserve_ntfs=self.ds_cfg.get( DS_CFG_KEY_PRESERVE_NTFS, False)) finally: push_log_to_kvp(self.sys_cfg['def_log_file']) return @property def availability_zone(self): return self.metadata.get( 'imds', {}).get('compute', {}).get('platformFaultDomain') @property def network_config(self): """Generate a network config like net.generate_fallback_network() with the following exceptions. 1. Probe the drivers of the net-devices present and inject them in the network configuration under params: driver: value 2. Generate a fallback network config that does not include any of the blacklisted devices. """ if not self._network_config or self._network_config == sources.UNSET: if self.ds_cfg.get('apply_network_config'): nc_src = self._metadata_imds else: nc_src = None self._network_config = parse_network_config(nc_src) return self._network_config @property def region(self): return self.metadata.get('imds', {}).get('compute', {}).get('location') def _partitions_on_device(devpath, maxnum=16): # return a list of tuples (ptnum, path) for each part on devpath for suff in ("-part", "p", ""): found = [] for pnum in range(1, maxnum): ppath = devpath + suff + str(pnum) if os.path.exists(ppath): found.append((pnum, os.path.realpath(ppath))) if found: return found return [] @azure_ds_telemetry_reporter def _has_ntfs_filesystem(devpath): ntfs_devices = util.find_devs_with("TYPE=ntfs", no_cache=True) LOG.debug('ntfs_devices found = %s', ntfs_devices) return os.path.realpath(devpath) in ntfs_devices @azure_ds_telemetry_reporter def can_dev_be_reformatted(devpath, preserve_ntfs): """Determine if the ephemeral drive at devpath should be reformatted. A fresh ephemeral disk is formatted by Azure and will: a.) have a partition table (dos or gpt) b.) have 1 partition that is ntfs formatted, or have 2 partitions with the second partition ntfs formatted. (larger instances with >2TB ephemeral disk have gpt, and will have a microsoft reserved partition as part 1. LP: #1686514) c.) the ntfs partition will have no files other than possibly 'dataloss_warning_readme.txt' User can indicate that NTFS should never be destroyed by setting DS_CFG_KEY_PRESERVE_NTFS in dscfg. If data is found on NTFS, user is warned to set DS_CFG_KEY_PRESERVE_NTFS to make sure cloud-init does not accidentally wipe their data. If cloud-init cannot mount the disk to check for data, destruction will be allowed, unless the dscfg key is set.""" if preserve_ntfs: msg = ('config says to never destroy NTFS (%s.%s), skipping checks' % (".".join(DS_CFG_PATH), DS_CFG_KEY_PRESERVE_NTFS)) return False, msg if not os.path.exists(devpath): return False, 'device %s does not exist' % devpath LOG.debug('Resolving realpath of %s -> %s', devpath, os.path.realpath(devpath)) # devpath of /dev/sd[a-z] or /dev/disk/cloud/azure_resource # where partitions are "1" or "-part1" or "p1" partitions = _partitions_on_device(devpath) if len(partitions) == 0: return False, 'device %s was not partitioned' % devpath elif len(partitions) > 2: msg = ('device %s had 3 or more partitions: %s' % (devpath, ' '.join([p[1] for p in partitions]))) return False, msg elif len(partitions) == 2: cand_part, cand_path = partitions[1] else: cand_part, cand_path = partitions[0] if not _has_ntfs_filesystem(cand_path): msg = ('partition %s (%s) on device %s was not ntfs formatted' % (cand_part, cand_path, devpath)) return False, msg @azure_ds_telemetry_reporter def count_files(mp): ignored = set(['dataloss_warning_readme.txt']) return len([f for f in os.listdir(mp) if f.lower() not in ignored]) bmsg = ('partition %s (%s) on device %s was ntfs formatted' % (cand_part, cand_path, devpath)) with events.ReportEventStack( name="mount-ntfs-and-count", description="mount-ntfs-and-count", parent=azure_ds_reporter ) as evt: try: file_count = util.mount_cb(cand_path, count_files, mtype="ntfs", update_env_for_mount={'LANG': 'C'}) except util.MountFailedError as e: evt.description = "cannot mount ntfs" if "unknown filesystem type 'ntfs'" in str(e): return True, (bmsg + ' but this system cannot mount NTFS,' ' assuming there are no important files.' ' Formatting allowed.') return False, bmsg + ' but mount of %s failed: %s' % (cand_part, e) if file_count != 0: evt.description = "mounted and counted %d files" % file_count LOG.warning("it looks like you're using NTFS on the ephemeral" " disk, to ensure that filesystem does not get wiped," " set %s.%s in config", '.'.join(DS_CFG_PATH), DS_CFG_KEY_PRESERVE_NTFS) return False, bmsg + ' but had %d files on it.' % file_count return True, bmsg + ' and had no important files. Safe for reformatting.' @azure_ds_telemetry_reporter def address_ephemeral_resize(devpath=RESOURCE_DISK_PATH, maxwait=120, is_new_instance=False, preserve_ntfs=False): # wait for ephemeral disk to come up naplen = .2 with events.ReportEventStack( name="wait-for-ephemeral-disk", description="wait for ephemeral disk", parent=azure_ds_reporter ): missing = util.wait_for_files([devpath], maxwait=maxwait, naplen=naplen, log_pre="Azure ephemeral disk: ") if missing: LOG.warning("ephemeral device '%s' did" " not appear after %d seconds.", devpath, maxwait) return result = False msg = None if is_new_instance: result, msg = (True, "First instance boot.") else: result, msg = can_dev_be_reformatted(devpath, preserve_ntfs) LOG.debug("reformattable=%s: %s", result, msg) if not result: return for mod in ['disk_setup', 'mounts']: sempath = '/var/lib/cloud/instance/sem/config_' + mod bmsg = 'Marker "%s" for module "%s"' % (sempath, mod) if os.path.exists(sempath): try: os.unlink(sempath) LOG.debug('%s removed.', bmsg) except Exception as e: # python3 throws FileNotFoundError, python2 throws OSError LOG.warning('%s: remove failed! (%s)', bmsg, e) else: LOG.debug('%s did not exist.', bmsg) return @azure_ds_telemetry_reporter def perform_hostname_bounce(hostname, cfg, prev_hostname): # set the hostname to 'hostname' if it is not already set to that. # then, if policy is not off, bounce the interface using command # Returns True if the network was bounced, False otherwise. command = cfg['command'] interface = cfg['interface'] policy = cfg['policy'] msg = ("hostname=%s policy=%s interface=%s" % (hostname, policy, interface)) env = os.environ.copy() env['interface'] = interface env['hostname'] = hostname env['old_hostname'] = prev_hostname if command == "builtin": if util.is_FreeBSD(): command = BOUNCE_COMMAND_FREEBSD elif subp.which('ifup'): command = BOUNCE_COMMAND_IFUP else: LOG.debug( "Skipping network bounce: ifupdown utils aren't present.") # Don't bounce as networkd handles hostname DDNS updates return False LOG.debug("pubhname: publishing hostname [%s]", msg) shell = not isinstance(command, (list, tuple)) # capture=False, see comments in bug 1202758 and bug 1206164. util.log_time(logfunc=LOG.debug, msg="publishing hostname", get_uptime=True, func=subp.subp, kwargs={'args': command, 'shell': shell, 'capture': False, 'env': env}) return True @azure_ds_telemetry_reporter def crtfile_to_pubkey(fname, data=None): pipeline = ('openssl x509 -noout -pubkey < "$0" |' 'ssh-keygen -i -m PKCS8 -f /dev/stdin') (out, _err) = subp.subp(['sh', '-c', pipeline, fname], capture=True, data=data) return out.rstrip() @azure_ds_telemetry_reporter def pubkeys_from_crt_files(flist): pubkeys = [] errors = [] for fname in flist: try: pubkeys.append(crtfile_to_pubkey(fname)) except subp.ProcessExecutionError: errors.append(fname) if errors: LOG.warning("failed to convert the crt files to pubkey: %s", errors) return pubkeys @azure_ds_telemetry_reporter def write_files(datadir, files, dirmode=None): def _redact_password(cnt, fname): """Azure provides the UserPassword in plain text. So we redact it""" try: root = ET.fromstring(cnt) for elem in root.iter(): if ('UserPassword' in elem.tag and elem.text != DEF_PASSWD_REDACTION): elem.text = DEF_PASSWD_REDACTION return ET.tostring(root) except Exception: LOG.critical("failed to redact userpassword in %s", fname) return cnt if not datadir: return if not files: files = {} util.ensure_dir(datadir, dirmode) for (name, content) in files.items(): fname = os.path.join(datadir, name) if 'ovf-env.xml' in name: content = _redact_password(content, fname) util.write_file(filename=fname, content=content, mode=0o600) @azure_ds_telemetry_reporter def invoke_agent(cmd): # this is a function itself to simplify patching it for test if cmd: LOG.debug("invoking agent: %s", cmd) subp.subp(cmd, shell=(not isinstance(cmd, list))) else: LOG.debug("not invoking agent") def find_child(node, filter_func): ret = [] if not node.hasChildNodes(): return ret for child in node.childNodes: if filter_func(child): ret.append(child) return ret @azure_ds_telemetry_reporter def load_azure_ovf_pubkeys(sshnode): # This parses a 'SSH' node formatted like below, and returns # an array of dicts. # [{'fingerprint': '6BE7A7C3C8A8F4B123CCA5D0C2F1BE4CA7B63ED7', # 'path': '/where/to/go'}] # # # ABC/x/y/z # ... # # Under some circumstances, there may be a element along with the # Fingerprint and Path. Pass those along if they appear. results = find_child(sshnode, lambda n: n.localName == "PublicKeys") if len(results) == 0: return [] if len(results) > 1: raise BrokenAzureDataSource("Multiple 'PublicKeys'(%s) in SSH node" % len(results)) pubkeys_node = results[0] pubkeys = find_child(pubkeys_node, lambda n: n.localName == "PublicKey") if len(pubkeys) == 0: return [] found = [] text_node = minidom.Document.TEXT_NODE for pk_node in pubkeys: if not pk_node.hasChildNodes(): continue cur = {'fingerprint': "", 'path': "", 'value': ""} for child in pk_node.childNodes: if child.nodeType == text_node or not child.localName: continue name = child.localName.lower() if name not in cur.keys(): continue if (len(child.childNodes) != 1 or child.childNodes[0].nodeType != text_node): continue cur[name] = child.childNodes[0].wholeText.strip() found.append(cur) return found @azure_ds_telemetry_reporter def read_azure_ovf(contents): try: dom = minidom.parseString(contents) except Exception as e: error_str = "Invalid ovf-env.xml: %s" % e report_diagnostic_event(error_str) raise BrokenAzureDataSource(error_str) from e results = find_child(dom.documentElement, lambda n: n.localName == "ProvisioningSection") if len(results) == 0: raise NonAzureDataSource("No ProvisioningSection") if len(results) > 1: raise BrokenAzureDataSource("found '%d' ProvisioningSection items" % len(results)) provSection = results[0] lpcs_nodes = find_child(provSection, lambda n: n.localName == "LinuxProvisioningConfigurationSet") if len(lpcs_nodes) == 0: raise NonAzureDataSource("No LinuxProvisioningConfigurationSet") if len(lpcs_nodes) > 1: raise BrokenAzureDataSource("found '%d' %ss" % (len(lpcs_nodes), "LinuxProvisioningConfigurationSet")) lpcs = lpcs_nodes[0] if not lpcs.hasChildNodes(): raise BrokenAzureDataSource("no child nodes of configuration set") md_props = 'seedfrom' md = {'azure_data': {}} cfg = {} ud = "" password = None username = None for child in lpcs.childNodes: if child.nodeType == dom.TEXT_NODE or not child.localName: continue name = child.localName.lower() simple = False value = "" if (len(child.childNodes) == 1 and child.childNodes[0].nodeType == dom.TEXT_NODE): simple = True value = child.childNodes[0].wholeText attrs = dict([(k, v) for k, v in child.attributes.items()]) # we accept either UserData or CustomData. If both are present # then behavior is undefined. if name == "userdata" or name == "customdata": if attrs.get('encoding') in (None, "base64"): ud = base64.b64decode(''.join(value.split())) else: ud = value elif name == "username": username = value elif name == "userpassword": password = value elif name == "hostname": md['local-hostname'] = value elif name == "dscfg": if attrs.get('encoding') in (None, "base64"): dscfg = base64.b64decode(''.join(value.split())) else: dscfg = value cfg['datasource'] = {DS_NAME: util.load_yaml(dscfg, default={})} elif name == "ssh": cfg['_pubkeys'] = load_azure_ovf_pubkeys(child) elif name == "disablesshpasswordauthentication": cfg['ssh_pwauth'] = util.is_false(value) elif simple: if name in md_props: md[name] = value else: md['azure_data'][name] = value defuser = {} if username: defuser['name'] = username if password: defuser['lock_passwd'] = False if DEF_PASSWD_REDACTION != password: defuser['passwd'] = encrypt_pass(password) if defuser: cfg['system_info'] = {'default_user': defuser} if 'ssh_pwauth' not in cfg and password: cfg['ssh_pwauth'] = True cfg['PreprovisionedVm'] = _extract_preprovisioned_vm_setting(dom) return (md, ud, cfg) @azure_ds_telemetry_reporter def _extract_preprovisioned_vm_setting(dom): """Read the preprovision flag from the ovf. It should not exist unless true.""" platform_settings_section = find_child( dom.documentElement, lambda n: n.localName == "PlatformSettingsSection") if not platform_settings_section or len(platform_settings_section) == 0: LOG.debug("PlatformSettingsSection not found") return False platform_settings = find_child( platform_settings_section[0], lambda n: n.localName == "PlatformSettings") if not platform_settings or len(platform_settings) == 0: LOG.debug("PlatformSettings not found") return False preprovisionedVm = find_child( platform_settings[0], lambda n: n.localName == "PreprovisionedVm") if not preprovisionedVm or len(preprovisionedVm) == 0: LOG.debug("PreprovisionedVm not found") return False return util.translate_bool(preprovisionedVm[0].firstChild.nodeValue) def encrypt_pass(password, salt_id="$6$"): return crypt.crypt(password, salt_id + util.rand_str(strlen=16)) @azure_ds_telemetry_reporter def _check_freebsd_cdrom(cdrom_dev): """Return boolean indicating path to cdrom device has content.""" try: with open(cdrom_dev) as fp: fp.read(1024) return True except IOError: LOG.debug("cdrom (%s) is not configured", cdrom_dev) return False @azure_ds_telemetry_reporter def _get_random_seed(source=PLATFORM_ENTROPY_SOURCE): """Return content random seed file if available, otherwise, return None.""" # azure / hyper-v provides random data here # now update ds_cfg to reflect contents pass in config if source is None: return None seed = util.load_file(source, quiet=True, decode=False) # The seed generally contains non-Unicode characters. load_file puts # them into a str (in python 2) or bytes (in python 3). In python 2, # bad octets in a str cause util.json_dumps() to throw an exception. In # python 3, bytes is a non-serializable type, and the handler load_file # uses applies b64 encoding *again* to handle it. The simplest solution # is to just b64encode the data and then decode it to a serializable # string. Same number of bits of entropy, just with 25% more zeroes. # There's no need to undo this base64-encoding when the random seed is # actually used in cc_seed_random.py. seed = base64.b64encode(seed).decode() return seed @azure_ds_telemetry_reporter def list_possible_azure_ds_devs(): devlist = [] if util.is_FreeBSD(): cdrom_dev = "/dev/cd0" if _check_freebsd_cdrom(cdrom_dev): return [cdrom_dev] else: for fstype in ("iso9660", "udf"): devlist.extend(util.find_devs_with("TYPE=%s" % fstype)) devlist.sort(reverse=True) return devlist @azure_ds_telemetry_reporter def load_azure_ds_dir(source_dir): ovf_file = os.path.join(source_dir, "ovf-env.xml") if not os.path.isfile(ovf_file): raise NonAzureDataSource("No ovf-env file found") with open(ovf_file, "rb") as fp: contents = fp.read() md, ud, cfg = read_azure_ovf(contents) return (md, ud, cfg, {'ovf-env.xml': contents}) @azure_ds_telemetry_reporter def parse_network_config(imds_metadata) -> dict: """Convert imds_metadata dictionary to network v2 configuration. Parses network configuration from imds metadata if present or generate fallback network config excluding mlx4_core devices. @param: imds_metadata: Dict of content read from IMDS network service. @return: Dictionary containing network version 2 standard configuration. """ if imds_metadata != sources.UNSET and imds_metadata: try: return _generate_network_config_from_imds_metadata(imds_metadata) except Exception as e: LOG.error( 'Failed generating network config ' 'from IMDS network metadata: %s', str(e)) try: return _generate_network_config_from_fallback_config() except Exception as e: LOG.error('Failed generating fallback network config: %s', str(e)) return {} @azure_ds_telemetry_reporter def _generate_network_config_from_imds_metadata(imds_metadata) -> dict: """Convert imds_metadata dictionary to network v2 configuration. Parses network configuration from imds metadata. @param: imds_metadata: Dict of content read from IMDS network service. @return: Dictionary containing network version 2 standard configuration. """ netconfig = {'version': 2, 'ethernets': {}} network_metadata = imds_metadata['network'] for idx, intf in enumerate(network_metadata['interface']): # First IPv4 and/or IPv6 address will be obtained via DHCP. # Any additional IPs of each type will be set as static # addresses. nicname = 'eth{idx}'.format(idx=idx) dhcp_override = {'route-metric': (idx + 1) * 100} dev_config = {'dhcp4': True, 'dhcp4-overrides': dhcp_override, 'dhcp6': False} for addr_type in ('ipv4', 'ipv6'): addresses = intf.get(addr_type, {}).get('ipAddress', []) if addr_type == 'ipv4': default_prefix = '24' else: default_prefix = '128' if addresses: dev_config['dhcp6'] = True # non-primary interfaces should have a higher # route-metric (cost) so default routes prefer # primary nic due to lower route-metric value dev_config['dhcp6-overrides'] = dhcp_override for addr in addresses[1:]: # Append static address config for ip > 1 netPrefix = intf[addr_type]['subnet'][0].get( 'prefix', default_prefix) privateIp = addr['privateIpAddress'] if not dev_config.get('addresses'): dev_config['addresses'] = [] dev_config['addresses'].append( '{ip}/{prefix}'.format( ip=privateIp, prefix=netPrefix)) if dev_config: mac = ':'.join(re.findall(r'..', intf['macAddress'])) dev_config.update({ 'match': {'macaddress': mac.lower()}, 'set-name': nicname }) # With netvsc, we can get two interfaces that # share the same MAC, so we need to make sure # our match condition also contains the driver driver = device_driver(nicname) if driver and driver == 'hv_netvsc': dev_config['match']['driver'] = driver netconfig['ethernets'][nicname] = dev_config return netconfig @azure_ds_telemetry_reporter def _generate_network_config_from_fallback_config() -> dict: """Generate fallback network config excluding mlx4_core & mlx5_core devices. @return: Dictionary containing network version 2 standard configuration. """ # Azure Dv4 and Ev4 series VMs always have mlx5 hardware. # https://docs.microsoft.com/en-us/azure/virtual-machines/dv4-dsv4-series # https://docs.microsoft.com/en-us/azure/virtual-machines/ev4-esv4-series # Earlier D and E series VMs (such as Dv2, Dv3, and Ev3 series VMs) # can have either mlx4 or mlx5 hardware, with the older series VMs # having a higher chance of coming with mlx4 hardware. # https://docs.microsoft.com/en-us/azure/virtual-machines/dv2-dsv2-series # https://docs.microsoft.com/en-us/azure/virtual-machines/dv3-dsv3-series # https://docs.microsoft.com/en-us/azure/virtual-machines/ev3-esv3-series blacklist = ['mlx4_core', 'mlx5_core'] # generate a network config, blacklist picking mlx4_core and mlx5_core devs return net.generate_fallback_config( blacklist_drivers=blacklist, config_driver=True) @azure_ds_telemetry_reporter def get_metadata_from_imds(fallback_nic, retries): """Query Azure's network metadata service, returning a dictionary. If network is not up, setup ephemeral dhcp on fallback_nic to talk to the IMDS. For more info on IMDS: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service @param fallback_nic: String. The name of the nic which requires active network in order to query IMDS. @param retries: The number of retries of the IMDS_URL. @return: A dict of instance metadata containing compute and network info. """ kwargs = {'logfunc': LOG.debug, 'msg': 'Crawl of Azure Instance Metadata Service (IMDS)', 'func': _get_metadata_from_imds, 'args': (retries,)} if net.is_up(fallback_nic): return util.log_time(**kwargs) else: try: with EphemeralDHCPv4WithReporting( azure_ds_reporter, fallback_nic): return util.log_time(**kwargs) except Exception as e: report_diagnostic_event("exception while getting metadata: %s" % e) raise @azure_ds_telemetry_reporter def _get_metadata_from_imds(retries): url = IMDS_URL + "instance?api-version=2019-06-01" headers = {"Metadata": "true"} try: response = readurl( url, timeout=IMDS_TIMEOUT_IN_SECONDS, headers=headers, retries=retries, exception_cb=retry_on_url_exc) except Exception as e: msg = 'Ignoring IMDS instance metadata: %s' % e report_diagnostic_event(msg) LOG.debug(msg) return {} try: from json.decoder import JSONDecodeError json_decode_error = JSONDecodeError except ImportError: json_decode_error = ValueError try: return util.load_json(str(response)) except json_decode_error as e: report_diagnostic_event('non-json imds response' % e) LOG.warning( 'Ignoring non-json IMDS instance metadata: %s', str(response)) return {} @azure_ds_telemetry_reporter def maybe_remove_ubuntu_network_config_scripts(paths=None): """Remove Azure-specific ubuntu network config for non-primary nics. @param paths: List of networking scripts or directories to remove when present. In certain supported ubuntu images, static udev rules or netplan yaml config is delivered in the base ubuntu image to support dhcp on any additional interfaces which get attached by a customer at some point after initial boot. Since the Azure datasource can now regenerate network configuration as metadata reports these new devices, we no longer want the udev rules or netplan's 90-hotplug-azure.yaml to configure networking on eth1 or greater as it might collide with cloud-init's configuration. Remove the any existing extended network scripts if the datasource is enabled to write network per-boot. """ if not paths: paths = UBUNTU_EXTENDED_NETWORK_SCRIPTS logged = False for path in paths: if os.path.exists(path): if not logged: LOG.info( 'Removing Ubuntu extended network scripts because' ' cloud-init updates Azure network configuration on the' ' following event: %s.', EventType.BOOT) logged = True if os.path.isdir(path): util.del_dir(path) else: util.del_file(path) def _is_platform_viable(seed_dir): """Check platform environment to report if this datasource may run.""" with events.ReportEventStack( name="check-platform-viability", description="found azure asset tag", parent=azure_ds_reporter ) as evt: asset_tag = util.read_dmi_data('chassis-asset-tag') if asset_tag == AZURE_CHASSIS_ASSET_TAG: return True msg = "Non-Azure DMI asset tag '%s' discovered." % asset_tag LOG.debug(msg) evt.description = msg report_diagnostic_event(msg) if os.path.exists(os.path.join(seed_dir, 'ovf-env.xml')): return True return False class BrokenAzureDataSource(Exception): pass class NonAzureDataSource(Exception): pass # Legacy: Must be present in case we load an old pkl object DataSourceAzureNet = DataSourceAzure # Used to match classes to dependencies datasources = [ (DataSourceAzure, (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) # vi: ts=4 expandtab