Current File : //lib/python3/dist-packages/cloudinit/sources/DataSourceAltCloud.py
# 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 os
import os.path
from cloudinit import dmi
from cloudinit import log as logging
from cloudinit import 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_file(deltacloud_user_data_file).strip()
except IOError:
try:
user_data = util.load_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://")
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_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 not hasattr(self, "source"):
self.source = sources.METADATA_UNKNOWN
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)
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