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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Hafliger <juerg.haefliger@hp.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 errno
import os
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import util
LOG = logging.getLogger(__name__)
class DataSourceNoCloud(sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.dsmode = 'local'
self.seed = None
self.cmdline_id = "ds=nocloud"
self.seed_dir = os.path.join(paths.seed_dir, 'nocloud')
self.supported_seed_starts = ("/", "file://")
def __str__(self):
mstr = "%s [seed=%s][dsmode=%s]" % (util.obj_name(self),
self.seed, self.dsmode)
return mstr
def get_data(self):
defaults = {
"instance-id": "nocloud",
"dsmode": self.dsmode,
}
found = []
md = {}
ud = ""
try:
# Parse the kernel command line, getting data passed in
if parse_cmdline_data(self.cmdline_id, md):
found.append("cmdline")
except:
util.logexc(LOG, "Unable to parse command line data")
return False
# Check to see if the seed dir has data.
seedret = {}
if util.read_optional_seed(seedret, base=self.seed_dir + "/"):
md = util.mergedict(md, seedret['meta-data'])
ud = seedret['user-data']
found.append(self.seed_dir)
LOG.debug("Using seeded cache data from %s", self.seed_dir)
# If the datasource config had a 'seedfrom' entry, then that takes
# precedence over a 'seedfrom' that was found in a filesystem
# but not over external media
if 'seedfrom' in self.ds_cfg and self.ds_cfg['seedfrom']:
found.append("ds_config")
md["seedfrom"] = self.ds_cfg['seedfrom']
fslist = util.find_devs_with("TYPE=vfat")
fslist.extend(util.find_devs_with("TYPE=iso9660"))
label_list = util.find_devs_with("LABEL=cidata")
devlist = list(set(fslist) & set(label_list))
devlist.sort(reverse=True)
for dev in devlist:
try:
LOG.debug("Attempting to use data from %s", dev)
(newmd, newud) = util.mount_cb(dev, util.read_seeded)
md = util.mergedict(newmd, md)
ud = newud
# For seed from a device, the default mode is 'net'.
# that is more likely to be what is desired.
# If they want dsmode of local, then they must
# specify that.
if 'dsmode' not in md:
md['dsmode'] = "net"
LOG.debug("Using data from %s", dev)
found.append(dev)
break
except OSError as e:
if e.errno != errno.ENOENT:
raise
except util.MountFailedError:
util.logexc(LOG, ("Failed to mount %s"
" when looking for data"), dev)
# There was no indication on kernel cmdline or data
# in the seeddir suggesting this handler should be used.
if len(found) == 0:
return False
seeded_interfaces = None
# The special argument "seedfrom" indicates we should
# attempt to seed the userdata / metadata from its value
# its primarily value is in allowing the user to type less
# on the command line, ie: ds=nocloud;s=http://bit.ly/abcdefg
if "seedfrom" in md:
seedfrom = md["seedfrom"]
seedfound = False
for proto in self.supported_seed_starts:
if seedfrom.startswith(proto):
seedfound = proto
break
if not seedfound:
LOG.debug("Seed from %s not supported by %s", seedfrom, self)
return False
if 'network-interfaces' in md:
seeded_interfaces = self.dsmode
# This could throw errors, but the user told us to do it
# so if errors are raised, let them raise
(md_seed, ud) = util.read_seeded(seedfrom, timeout=None)
LOG.debug("Using seeded cache data from %s", seedfrom)
# Values in the command line override those from the seed
md = util.mergedict(md, md_seed)
found.append(seedfrom)
# Now that we have exhausted any other places merge in the defaults
md = util.mergedict(md, defaults)
# Update the network-interfaces if metadata had 'network-interfaces'
# entry and this is the local datasource, or 'seedfrom' was used
# and the source of the seed was self.dsmode
# ('local' for NoCloud, 'net' for NoCloudNet')
if ('network-interfaces' in md and
(self.dsmode in ("local", seeded_interfaces))):
LOG.debug("Updating network interfaces from %s", self)
self.distro.apply_network(md['network-interfaces'])
if md['dsmode'] == self.dsmode:
self.seed = ",".join(found)
self.metadata = md
self.userdata_raw = ud
return True
LOG.debug("%s: not claiming datasource, dsmode=%s", self, md['dsmode'])
return False
# Returns true or false indicating if cmdline indicated
# that this module should be used
# Example cmdline:
# root=LABEL=uec-rootfs ro ds=nocloud
def parse_cmdline_data(ds_id, fill, cmdline=None):
if cmdline is None:
cmdline = util.get_cmdline()
cmdline = " %s " % cmdline
if not (" %s " % ds_id in cmdline or " %s;" % ds_id in cmdline):
return False
argline = ""
# cmdline can contain:
# ds=nocloud[;key=val;key=val]
for tok in cmdline.split():
if tok.startswith(ds_id):
argline = tok.split("=", 1)
# argline array is now 'nocloud' followed optionally by
# a ';' and then key=value pairs also terminated with ';'
tmp = argline[1].split(";")
if len(tmp) > 1:
kvpairs = tmp[1:]
else:
kvpairs = ()
# short2long mapping to save cmdline typing
s2l = {"h": "local-hostname", "i": "instance-id", "s": "seedfrom"}
for item in kvpairs:
try:
(k, v) = item.split("=", 1)
except:
k = item
v = None
if k in s2l:
k = s2l[k]
fill[k] = v
return True
class DataSourceNoCloudNet(DataSourceNoCloud):
def __init__(self, sys_cfg, distro, paths):
DataSourceNoCloud.__init__(self, sys_cfg, distro, paths)
self.cmdline_id = "ds=nocloud-net"
self.supported_seed_starts = ("http://", "https://", "ftp://")
self.seed_dir = os.path.join(paths.seed_dir, 'nocloud-net')
self.dsmode = "net"
# Used to match classes to dependencies
datasources = [
(DataSourceNoCloud, (sources.DEP_FILESYSTEM, )),
(DataSourceNoCloudNet, (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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