# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import util
from cloudinit.sources.helpers import openstack
LOG = logging.getLogger(__name__)
# Various defaults/constants...
DEFAULT_IID = "iid-dsconfigdrive"
DEFAULT_MODE = 'pass'
DEFAULT_METADATA = {
"instance-id": DEFAULT_IID,
}
VALID_DSMODES = ("local", "net", "pass", "disabled")
FS_TYPES = ('vfat', 'iso9660')
LABEL_TYPES = ('config-2',)
OPTICAL_DEVICES = tuple(('/dev/sr%s' % i for i in range(0, 2)))
class DataSourceConfigDrive(openstack.SourceMixin, sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
super(DataSourceConfigDrive, self).__init__(sys_cfg, distro, paths)
self.source = None
self.dsmode = 'local'
self.seed_dir = os.path.join(paths.seed_dir, 'config_drive')
self.version = None
self.ec2_metadata = None
self.files = {}
def __str__(self):
root = sources.DataSource.__str__(self)
mstr = "%s [%s,ver=%s]" % (root, self.dsmode, self.version)
mstr += "[source=%s]" % (self.source)
return mstr
def get_data(self):
found = None
md = {}
results = {}
if os.path.isdir(self.seed_dir):
try:
results = read_config_drive(self.seed_dir)
found = self.seed_dir
except openstack.NonReadable:
util.logexc(LOG, "Failed reading config drive from %s",
self.seed_dir)
if not found:
for dev in find_candidate_devs():
try:
results = util.mount_cb(dev, read_config_drive)
found = dev
except openstack.NonReadable:
pass
except util.MountFailedError:
pass
except openstack.BrokenMetadata:
util.logexc(LOG, "Broken config drive: %s", dev)
if found:
break
if not found:
return False
md = results.get('metadata', {})
md = util.mergemanydict([md, DEFAULT_METADATA])
user_dsmode = results.get('dsmode', None)
if user_dsmode not in VALID_DSMODES + (None,):
LOG.warn("User specified invalid mode: %s", user_dsmode)
user_dsmode = None
dsmode = get_ds_mode(cfgdrv_ver=results['version'],
ds_cfg=self.ds_cfg.get('dsmode'),
user=user_dsmode)
if dsmode == "disabled":
# most likely user specified
return False
# TODO(smoser): fix this, its dirty.
# we want to do some things (writing files and network config)
# only on first boot, and even then, we want to do so in the
# local datasource (so they happen earlier) even if the configured
# dsmode is 'net' or 'pass'. To do this, we check the previous
# instance-id
prev_iid = get_previous_iid(self.paths)
cur_iid = md['instance-id']
if prev_iid != cur_iid and self.dsmode == "local":
on_first_boot(results, distro=self.distro)
# dsmode != self.dsmode here if:
# * dsmode = "pass", pass means it should only copy files and then
# pass to another datasource
# * dsmode = "net" and self.dsmode = "local"
# so that user boothooks would be applied with network, the
# local datasource just gets out of the way, and lets the net claim
if dsmode != self.dsmode:
LOG.debug("%s: not claiming datasource, dsmode=%s", self, dsmode)
return False
self.source = found
self.metadata = md
self.ec2_metadata = results.get('ec2-metadata')
self.userdata_raw = results.get('userdata')
self.version = results['version']
self.files.update(results.get('files', {}))
# if vendordata includes 'cloud-init', then read that explicitly
# for cloud-init (for namespacing).
vd = results.get('vendordata')
if isinstance(vd, dict):
if 'cloud-init' in vd:
self.vendordata_raw = vd['cloud-init']
else:
# TODO(pquerna): this is so wrong.
self.vendordata_raw = json.dumps(vd)
else:
self.vendordata_raw = vd
return True
class DataSourceConfigDriveNet(DataSourceConfigDrive):
def __init__(self, sys_cfg, distro, paths):
DataSourceConfigDrive.__init__(self, sys_cfg, distro, paths)
self.dsmode = 'net'
def get_ds_mode(cfgdrv_ver, ds_cfg=None, user=None):
"""Determine what mode should be used.
valid values are 'pass', 'disabled', 'local', 'net'
"""
# user passed data trumps everything
if user is not None:
return user
if ds_cfg is not None:
return ds_cfg
# at config-drive version 1, the default behavior was pass. That
# meant to not use use it as primary data source, but expect a ec2 metadata
# source. for version 2, we default to 'net', which means
# the DataSourceConfigDriveNet, would be used.
#
# this could change in the future. If there was definitive metadata
# that indicated presense of an openstack metadata service, then
# we could change to 'pass' by default also. The motivation for that
# would be 'cloud-init query' as the web service could be more dynamic
if cfgdrv_ver == 1:
return "pass"
return "net"
def read_config_drive(source_dir, version="2013-10-17"):
reader = openstack.ConfigDriveReader(source_dir)
finders = [
(reader.read_v2, [], {'version': version}),
(reader.read_v1, [], {}),
]
excps = []
for (functor, args, kwargs) in finders:
try:
return functor(*args, **kwargs)
except openstack.NonReadable as e:
excps.append(e)
raise excps[-1]
def get_previous_iid(paths):
# interestingly, for this purpose the "previous" instance-id is the current
# instance-id. cloud-init hasn't moved them over yet as this datasource
# hasn't declared itself found.
fname = os.path.join(paths.get_cpath('data'), 'instance-id')
try:
return util.load_file(fname).rstrip("\n")
except IOError:
return None
def on_first_boot(data, distro=None):
"""Performs any first-boot actions using data read from a config-drive."""
if not isinstance(data, dict):
raise TypeError("Config-drive data expected to be a dict; not %s"
% (type(data)))
net_conf = data.get("network_config", '')
if net_conf and distro:
LOG.debug("Updating network interfaces from config drive")
distro.apply_network(net_conf)
files = data.get('files', {})
if files:
LOG.debug("Writing %s injected files", len(files))
for (filename, content) in files.iteritems():
if not filename.startswith(os.sep):
filename = os.sep + filename
try:
util.write_file(filename, content, mode=0660)
except IOError:
util.logexc(LOG, "Failed writing file: %s", filename)
def find_candidate_devs(probe_optical=True):
"""Return a list of devices that may contain the config drive.
The returned list is sorted by search order where the first item has
should be searched first (highest priority)
config drive v1:
Per documentation, this is "associated as the last available disk on the
instance", and should be VFAT.
Currently, we do not restrict search list to "last available disk"
config drive v2:
Disk should be:
* either vfat or iso9660 formated
* labeled with 'config-2'
"""
# query optical drive to get it in blkid cache for 2.6 kernels
if probe_optical:
for device in OPTICAL_DEVICES:
try:
util.find_devs_with(path=device)
except util.ProcessExecutionError:
pass
by_fstype = []
for fs_type in FS_TYPES:
by_fstype.extend(util.find_devs_with("TYPE=%s" % (fs_type)))
by_label = []
for label in LABEL_TYPES:
by_label.extend(util.find_devs_with("LABEL=%s" % (label)))
# give preference to "last available disk" (vdb over vda)
# note, this is not a perfect rendition of that.
by_fstype.sort(reverse=True)
by_label.sort(reverse=True)
# combine list of items by putting by-label items first
# followed by fstype items, but with dupes removed
candidates = (by_label + [d for d in by_fstype if d not in by_label])
# We are looking for a block device or partition with necessary label or
# an unpartitioned block device (ex sda, not sda1)
devices = [d for d in candidates
if d in by_label or not util.is_partition(d)]
return devices
# Used to match classes to dependencies
datasources = [
(DataSourceConfigDrive, (sources.DEP_FILESYSTEM, )),
(DataSourceConfigDriveNet, (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)