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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Hafliger <juerg.haefliger@hp.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
import socket
import time
import boto.utils as boto_utils
import os.path
class DataSourceEc2(DataSource.DataSource):
api_ver = '2009-04-04'
seeddir = base_seeddir + '/ec2'
metadata_address = "http://169.254.169.254"
def __str__(self):
return("DataSourceEc2")
def get_data(self):
seedret = {}
if util.read_optional_seed(seedret, base=self.seeddir + "/"):
self.userdata_raw = seedret['user-data']
self.metadata = seedret['meta-data']
log.debug("using seeded ec2 data in %s" % self.seeddir)
return True
try:
if not self.wait_for_metadata_service():
return False
start = time.time()
self.userdata_raw = boto_utils.get_instance_userdata(self.api_ver,
None, self.metadata_address)
self.metadata = boto_utils.get_instance_metadata(self.api_ver,
self.metadata_address)
log.debug("crawl of metadata service took %ds" % (time.time() -
start))
return True
except Exception as e:
print e
return False
def get_instance_id(self):
return(self.metadata['instance-id'])
def get_availability_zone(self):
return(self.metadata['placement']['availability-zone'])
def get_local_mirror(self):
return(self.get_mirror_from_availability_zone())
def get_mirror_from_availability_zone(self, availability_zone=None):
# availability is like 'us-west-1b' or 'eu-west-1a'
if availability_zone == None:
availability_zone = self.get_availability_zone()
fallback = None
if self.is_vpc():
return fallback
try:
host = "%s.ec2.archive.ubuntu.com" % availability_zone[:-1]
socket.getaddrinfo(host, None, 0, socket.SOCK_STREAM)
return 'http://%s/ubuntu/' % host
except:
return fallback
def wait_for_metadata_service(self):
mcfg = self.ds_cfg
if not hasattr(mcfg, "get"):
mcfg = {}
max_wait = 120
try:
max_wait = int(mcfg.get("max_wait", max_wait))
except Exception:
util.logexc(log)
log.warn("Failed to get max wait. using %s" % max_wait)
if max_wait == 0:
return False
timeout = 50
try:
timeout = int(mcfg.get("timeout", timeout))
except Exception:
util.logexc(log)
log.warn("Failed to get timeout, using %s" % timeout)
def_mdurls = ["http://169.254.169.254", "http://instance-data:8773"]
mdurls = mcfg.get("metadata_urls", def_mdurls)
# Remove addresses from the list that wont resolve.
filtered = [x for x in mdurls if util.is_resolvable_url(x)]
if set(filtered) != set(mdurls):
log.debug("removed the following from metadata urls: %s" %
list((set(mdurls) - set(filtered))))
if len(filtered):
mdurls = filtered
else:
log.warn("Empty metadata url list! using default list")
mdurls = def_mdurls
urls = []
url2base = {False: False}
for url in mdurls:
cur = "%s/%s/meta-data/instance-id" % (url, self.api_ver)
urls.append(cur)
url2base[cur] = url
starttime = time.time()
url = util.wait_for_url(urls=urls, max_wait=max_wait,
timeout=timeout, status_cb=log.warn)
if url:
log.debug("Using metadata source: '%s'" % url2base[url])
else:
log.critical("giving up on md after %i seconds\n" %
int(time.time() - starttime))
self.metadata_address = url2base[url]
return (bool(url))
def device_name_to_device(self, name):
# consult metadata service, that has
# ephemeral0: sdb
# and return 'sdb' for input 'ephemeral0'
if 'block-device-mapping' not in self.metadata:
return(None)
found = None
for entname, device in self.metadata['block-device-mapping'].items():
if entname == name:
found = device
break
# LP: #513842 mapping in Euca has 'ephemeral' not 'ephemeral0'
if entname == "ephemeral" and name == "ephemeral0":
found = device
if found == None:
log.debug("unable to convert %s to a device" % name)
return None
# LP: #611137
# the metadata service may believe that devices are named 'sda'
# when the kernel named them 'vda' or 'xvda'
# we want to return the correct value for what will actually
# exist in this instance
mappings = {"sd": ("vd", "xvd")}
ofound = found
short = os.path.basename(found)
if not found.startswith("/"):
found = "/dev/%s" % found
if os.path.exists(found):
return(found)
for nfrom, tlist in mappings.items():
if not short.startswith(nfrom):
continue
for nto in tlist:
cand = "/dev/%s%s" % (nto, short[len(nfrom):])
if os.path.exists(cand):
log.debug("remapped device name %s => %s" % (found, cand))
return(cand)
# on t1.micro, ephemeral0 will appear in block-device-mapping from
# metadata, but it will not exist on disk (and never will)
# at this pint, we've verified that the path did not exist
# in the special case of 'ephemeral0' return None to avoid bogus
# fstab entry (LP: #744019)
if name == "ephemeral0":
return None
return ofound
def is_vpc(self):
# per comment in LP: #615545
ph = "public-hostname"
p4 = "public-ipv4"
if ((ph not in self.metadata or self.metadata[ph] == "") and
(p4 not in self.metadata or self.metadata[p4] == "")):
return True
return False
datasources = [
(DataSourceEc2, (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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