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DataSourceAltCloud.py
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# Copyright (C) 2009-2010 Canonical Ltd. # Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P. # Copyright (C) 2012 Yahoo! Inc. # # Author: Joe VLcek <JVLcek@RedHat.com> # Author: Juerg Haefliger <juerg.haefliger@hp.com> # # This file is part of cloud-init. See LICENSE file for license information. """ This file contains code used to gather the user data passed to an instance on RHEVm and vSphere. """ import errno import logging import os import os.path from cloudinit import dmi, sources, subp, util LOG = logging.getLogger(__name__) # Needed file paths CLOUD_INFO_FILE = "/etc/sysconfig/cloud-info" # Shell command lists CMD_PROBE_FLOPPY = ["modprobe", "floppy"] META_DATA_NOT_SUPPORTED = { "block-device-mapping": {}, "instance-id": 455, "local-hostname": "localhost", "placement": {}, } def read_user_data_callback(mount_dir): """ Description: This callback will be applied by util.mount_cb() on the mounted file. Deltacloud file name contains deltacloud. Those not using Deltacloud but instead instrumenting the injection, could drop deltacloud from the file name. Input: mount_dir - Mount directory Returns: User Data """ deltacloud_user_data_file = mount_dir + "/deltacloud-user-data.txt" user_data_file = mount_dir + "/user-data.txt" # First try deltacloud_user_data_file. On failure try user_data_file. try: user_data = util.load_text_file(deltacloud_user_data_file).strip() except IOError: try: user_data = util.load_text_file(user_data_file).strip() except IOError: util.logexc(LOG, "Failed accessing user data file.") return None return user_data class DataSourceAltCloud(sources.DataSource): dsname = "AltCloud" def __init__(self, sys_cfg, distro, paths): sources.DataSource.__init__(self, sys_cfg, distro, paths) self.seed = None self.supported_seed_starts = ("/", "file://") self.source = sources.METADATA_UNKNOWN def _unpickle(self, ci_pkl_version: int) -> None: super()._unpickle(ci_pkl_version) if not hasattr(self, "source"): self.source = sources.METADATA_UNKNOWN def __str__(self): root = sources.DataSource.__str__(self) return "%s [seed=%s]" % (root, self.seed) def get_cloud_type(self): """ Description: Get the type for the cloud back end this instance is running on by examining the string returned by reading either: CLOUD_INFO_FILE or the dmi data. Input: None Returns: One of the following strings: 'RHEV', 'VSPHERE' or 'UNKNOWN' """ if os.path.exists(CLOUD_INFO_FILE): try: cloud_type = ( util.load_text_file(CLOUD_INFO_FILE).strip().upper() ) except IOError: util.logexc( LOG, "Unable to access cloud info file at %s.", CLOUD_INFO_FILE, ) return "UNKNOWN" return cloud_type system_name = dmi.read_dmi_data("system-product-name") if not system_name: return "UNKNOWN" sys_name = system_name.upper() if sys_name.startswith("RHEV"): return "RHEV" if sys_name.startswith("VMWARE"): return "VSPHERE" return "UNKNOWN" def _get_data(self): """ Description: User Data is passed to the launching instance which is used to perform instance configuration. Cloud providers expose the user data differently. It is necessary to determine which cloud provider the current instance is running on to determine how to access the user data. Images built with image factory will contain a CLOUD_INFO_FILE which contains a string identifying the cloud provider. Images not built with Imagefactory will try to determine what the cloud provider is based on system information. """ LOG.debug("Invoked get_data()") cloud_type = self.get_cloud_type() LOG.debug("cloud_type: %s", str(cloud_type)) if "RHEV" in cloud_type: if self.user_data_rhevm(): return True elif "VSPHERE" in cloud_type: if self.user_data_vsphere(): return True else: # there was no recognized alternate cloud type # indicating this handler should not be used. return False # No user data found util.logexc(LOG, "Failed accessing user data.") return False def _get_subplatform(self): """Return the subplatform metadata details.""" cloud_type = self.get_cloud_type() if cloud_type == "RHEV": self.source = "/dev/fd0" return "%s (%s)" % (cloud_type.lower(), self.source) def user_data_rhevm(self): """ RHEVM specific userdata read If on RHEV-M the user data will be contained on the floppy device in file <user_data_file> To access it: modprobe floppy Leverage util.mount_cb to: mkdir <tmp mount dir> mount /dev/fd0 <tmp mount dir> The call back passed to util.mount_cb will do: read <tmp mount dir>/<user_data_file> """ return_str = None # modprobe floppy try: modprobe_floppy() except subp.ProcessExecutionError as e: util.logexc(LOG, "Failed modprobe: %s", e) return False floppy_dev = "/dev/fd0" # udevadm settle for floppy device try: util.udevadm_settle(exists=floppy_dev, timeout=5) except (subp.ProcessExecutionError, OSError) as e: util.logexc(LOG, "Failed udevadm_settle: %s\n", e) return False try: return_str = util.mount_cb(floppy_dev, read_user_data_callback) except OSError as err: if err.errno != errno.ENOENT: raise except util.MountFailedError: util.logexc( LOG, "Failed to mount %s when looking for user data", floppy_dev, ) self.userdata_raw = return_str self.metadata = META_DATA_NOT_SUPPORTED if return_str: return True else: return False def user_data_vsphere(self): """ vSphere specific userdata read If on vSphere the user data will be contained on the cdrom device in file <user_data_file> To access it: Leverage util.mount_cb to: mkdir <tmp mount dir> mount /dev/fd0 <tmp mount dir> The call back passed to util.mount_cb will do: read <tmp mount dir>/<user_data_file> """ return_str = None cdrom_list = util.find_devs_with("LABEL=CDROM") for cdrom_dev in cdrom_list: try: return_str = util.mount_cb(cdrom_dev, read_user_data_callback) if return_str: self.source = cdrom_dev break except OSError as err: if err.errno != errno.ENOENT: raise except util.MountFailedError: util.logexc( LOG, "Failed to mount %s when looking for user data", cdrom_dev, ) self.userdata_raw = return_str self.metadata = META_DATA_NOT_SUPPORTED if return_str: return True else: return False def modprobe_floppy(): out, _err = subp.subp(CMD_PROBE_FLOPPY) LOG.debug("Command: %s\nOutput%s", " ".join(CMD_PROBE_FLOPPY), out) # Used to match classes to dependencies # Source DataSourceAltCloud does not really depend on networking. # In the future 'dsmode' like behavior can be added to offer user # the ability to run before networking. datasources = [ (DataSourceAltCloud, (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)