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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.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 cloudinit.DataSource as DataSource
from cloudinit import seeddir as base_seeddir
from cloudinit import log
import cloudinit.util as util
class DataSourceNoCloud(DataSource.DataSource):
metadata = None
userdata = None
userdata_raw = None
supported_seed_starts = ("/", "file://")
seed = None
cmdline_id = "ds=nocloud"
seeddir = base_seeddir + '/nocloud'
def __str__(self):
mstr = "DataSourceNoCloud"
mstr = mstr + " [seed=%s]" % self.seed
return(mstr)
def get_data(self):
defaults = {
"instance-id": "nocloud"
}
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)
return False
# check to see if the seeddir has data.
seedret = {}
if util.read_optional_seed(seedret, base=self.seeddir + "/"):
md = util.mergedict(md, seedret['meta-data'])
ud = seedret['user-data']
found.append(self.seeddir)
log.debug("using seeded cache data in %s" % self.seeddir)
# there was no indication on kernel cmdline or data
# in the seeddir suggesting this handler should be used.
if len(found) == 0:
return False
# the special argument "seedfrom" indicates we should
# attempt to seed the userdata / metadata from its value
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.__class__))
return False
# 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)
md = util.mergedict(md, defaults)
self.seed = ",".join(found)
self.metadata = md
self.userdata_raw = ud
return True
# 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):
cmdline_id = "ds=nocloud-net"
supported_seed_starts = ("http://", "https://", "ftp://")
seeddir = base_seeddir + '/nocloud-net'
datasources = (
(DataSourceNoCloud, (DataSource.DEP_FILESYSTEM, )),
(DataSourceNoCloudNet,
(DataSource.DEP_FILESYSTEM, DataSource.DEP_NETWORK)),
)
# return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return(DataSource.list_from_depends(depends, datasources))
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