c10de5db0f
What this does is provide an second DataSource that could use the kernel command line url=. For example: ro root=/dev/vda url=http://example.com/i-abcdefg/ http://example.com/i-abcdefg/ would contain: datasource: NoCloud: # default seedfrom is None # if found, then it should contain a url with: # <url>/user-data and <url>/meta-data # seedfrom: http://my.example.com/i-abcde seedfrom: http://example.com/i-abcdefg/ Then, the NoCloudNet DataSource would find that seedfrom config and consume data at http://example.com/i-abcdefg/user-data and http://example.com/i-abcdefg/meta-data
233 lines
7.7 KiB
Python
233 lines
7.7 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2009-2010 Canonical Ltd.
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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# Author: Juerg Hafliger <juerg.haefliger@hp.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import cloudinit.DataSource as DataSource
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from cloudinit import seeddir as base_seeddir
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from cloudinit import log
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import cloudinit.util as util
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import errno
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import subprocess
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class DataSourceNoCloud(DataSource.DataSource):
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metadata = None
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userdata = None
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userdata_raw = None
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supported_seed_starts = ("/", "file://")
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dsmode = "local"
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seed = None
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cmdline_id = "ds=nocloud"
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seeddir = base_seeddir + '/nocloud'
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def __str__(self):
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mstr = "DataSourceNoCloud"
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mstr = mstr + " [seed=%s]" % self.seed
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return(mstr)
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def get_data(self):
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defaults = {
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"instance-id": "nocloud", "dsmode": self.dsmode
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}
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found = []
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md = {}
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ud = ""
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try:
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# parse the kernel command line, getting data passed in
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if parse_cmdline_data(self.cmdline_id, md):
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found.append("cmdline")
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except:
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util.logexc(log)
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return False
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# check to see if the seeddir has data.
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seedret = {}
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if util.read_optional_seed(seedret, base=self.seeddir + "/"):
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md = util.mergedict(md, seedret['meta-data'])
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ud = seedret['user-data']
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found.append(self.seeddir)
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log.debug("using seeded cache data in %s" % self.seeddir)
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# if the datasource config had a 'seedfrom' entry, then that takes
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# precedence over a 'seedfrom' that was found in a filesystem
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# but not over external medi
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if 'seedfrom' in self.ds_cfg and self.ds_cfg['seedfrom']:
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found.append(["ds_config"])
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md["seedfrom"] = self.ds_cfg['seedfrom']
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fslist = util.find_devs_with("TYPE=vfat")
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fslist.extend(util.find_devs_with("TYPE=iso9660"))
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label_list = util.find_devs_with("LABEL=cidata")
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devlist = list(set(fslist) & set(label_list))
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devlist.sort(reverse=True)
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for dev in devlist:
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try:
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(newmd, newud) = util.mount_callback_umount(dev,
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util.read_seeded)
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md = util.mergedict(newmd, md)
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ud = newud
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# for seed from a device, the default mode is 'net'.
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# that is more likely to be what is desired.
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# If they want dsmode of local, then they must
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# specify that.
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if 'dsmode' not in md:
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md['dsmode'] = "net"
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log.debug("using data from %s" % dev)
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found.append(dev)
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break
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except OSError, e:
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if e.errno != errno.ENOENT:
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raise
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except util.mountFailedError:
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log.warn("Failed to mount %s when looking for seed" % dev)
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# there was no indication on kernel cmdline or data
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# in the seeddir suggesting this handler should be used.
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if len(found) == 0:
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return False
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seeded_interfaces = None
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# the special argument "seedfrom" indicates we should
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# attempt to seed the userdata / metadata from its value
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# its primarily value is in allowing the user to type less
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# on the command line, ie: ds=nocloud;s=http://bit.ly/abcdefg
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if "seedfrom" in md:
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seedfrom = md["seedfrom"]
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seedfound = False
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for proto in self.supported_seed_starts:
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if seedfrom.startswith(proto):
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seedfound = proto
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break
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if not seedfound:
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log.debug("seed from %s not supported by %s" %
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(seedfrom, self.__class__))
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return False
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if 'network-interfaces' in md:
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seeded_interfaces = self.dsmode
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# this could throw errors, but the user told us to do it
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# so if errors are raised, let them raise
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(md_seed, ud) = util.read_seeded(seedfrom, timeout=None)
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log.debug("using seeded cache data from %s" % seedfrom)
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# values in the command line override those from the seed
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md = util.mergedict(md, md_seed)
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found.append(seedfrom)
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md = util.mergedict(md, defaults)
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# update the network-interfaces if metadata had 'network-interfaces'
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# entry and this is the local datasource, or 'seedfrom' was used
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# and the source of the seed was self.dsmode
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# ('local' for NoCloud, 'net' for NoCloudNet')
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if ('network-interfaces' in md and
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(self.dsmode in ("local", seeded_interfaces))):
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log.info("updating network interfaces from nocloud")
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util.write_file("/etc/network/interfaces",
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md['network-interfaces'])
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try:
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(out, err) = util.subp(['ifup', '--all'])
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if len(out) or len(err):
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log.warn("ifup --all had stderr: %s" % err)
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except subprocess.CalledProcessError as exc:
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log.warn("ifup --all failed: %s" % (exc.output[1]))
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self.seed = ",".join(found)
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self.metadata = md
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self.userdata_raw = ud
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if md['dsmode'] == self.dsmode:
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return True
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log.debug("%s: not claiming datasource, dsmode=%s" %
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(self, md['dsmode']))
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return False
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# returns true or false indicating if cmdline indicated
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# that this module should be used
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# example cmdline:
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# root=LABEL=uec-rootfs ro ds=nocloud
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def parse_cmdline_data(ds_id, fill, cmdline=None):
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if cmdline is None:
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cmdline = util.get_cmdline()
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cmdline = " %s " % cmdline
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if not (" %s " % ds_id in cmdline or " %s;" % ds_id in cmdline):
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return False
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argline = ""
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# cmdline can contain:
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# ds=nocloud[;key=val;key=val]
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for tok in cmdline.split():
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if tok.startswith(ds_id):
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argline = tok.split("=", 1)
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# argline array is now 'nocloud' followed optionally by
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# a ';' and then key=value pairs also terminated with ';'
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tmp = argline[1].split(";")
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if len(tmp) > 1:
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kvpairs = tmp[1:]
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else:
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kvpairs = ()
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# short2long mapping to save cmdline typing
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s2l = {"h": "local-hostname", "i": "instance-id", "s": "seedfrom"}
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for item in kvpairs:
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try:
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(k, v) = item.split("=", 1)
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except:
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k = item
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v = None
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if k in s2l:
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k = s2l[k]
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fill[k] = v
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return(True)
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class DataSourceNoCloudNet(DataSourceNoCloud):
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cmdline_id = "ds=nocloud-net"
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supported_seed_starts = ("http://", "https://", "ftp://")
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seeddir = base_seeddir + '/nocloud-net'
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dsmode = "net"
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datasources = (
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(DataSourceNoCloud, (DataSource.DEP_FILESYSTEM, )),
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(DataSourceNoCloudNet,
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(DataSource.DEP_FILESYSTEM, DataSource.DEP_NETWORK)),
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)
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# return a list of data sources that match this set of dependencies
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def get_datasource_list(depends):
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return(DataSource.list_from_depends(depends, datasources))
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