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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 os
import time
from cloudinit import ec2_utils as ec2
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import url_helper as uhelp
from cloudinit import util
LOG = logging.getLogger(__name__)
# Which version we are requesting of the ec2 metadata apis
DEF_MD_VERSION = '2009-04-04'
class DataSourceEc2(sources.DataSource):
# Default metadata urls that will be used if none are provided
# They will be checked for 'resolveability' and some of the
# following may be discarded if they do not resolve
metadata_urls = ["http://169.254.169.254", "http://instance-data.:8773"]
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.metadata_address = None
self.seed_dir = os.path.join(paths.seed_dir, "ec2")
self.api_ver = DEF_MD_VERSION
def get_data(self):
seed_ret = {}
if util.read_optional_seed(seed_ret, base=(self.seed_dir + "/")):
self.userdata_raw = seed_ret['user-data']
self.metadata = seed_ret['meta-data']
LOG.debug("Using seeded ec2 data from %s", self.seed_dir)
return True
try:
if not self.wait_for_metadata_service():
return False
start_time = time.time()
self.userdata_raw = \
ec2.get_instance_userdata(self.api_ver, self.metadata_address)
self.metadata = ec2.get_instance_metadata(self.api_ver,
self.metadata_address)
LOG.debug("Crawl of metadata service took %s seconds",
int(time.time() - start_time))
return True
except Exception:
util.logexc(LOG, "Failed reading from metadata address %s",
self.metadata_address)
return False
@property
def launch_index(self):
if not self.metadata:
return None
return self.metadata.get('ami-launch-index')
def get_instance_id(self):
return self.metadata['instance-id']
def _get_url_settings(self):
mcfg = self.ds_cfg
max_wait = 120
try:
max_wait = int(mcfg.get("max_wait", max_wait))
except Exception:
util.logexc(LOG, "Failed to get max wait. using %s", max_wait)
timeout = 50
try:
timeout = max(0, int(mcfg.get("timeout", timeout)))
except Exception:
util.logexc(LOG, "Failed to get timeout, using %s", timeout)
return (max_wait, timeout)
def wait_for_metadata_service(self):
mcfg = self.ds_cfg
(max_wait, timeout) = self._get_url_settings()
if max_wait <= 0:
return False
# Remove addresses from the list that wont resolve.
mdurls = mcfg.get("metadata_urls", self.metadata_urls)
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 = self.metadata_urls
urls = []
url2base = {}
for url in mdurls:
cur = "%s/%s/meta-data/instance-id" % (url, self.api_ver)
urls.append(cur)
url2base[cur] = url
start_time = time.time()
url = uhelp.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 from %s after %s seconds",
urls, int(time.time() - start_time))
self.metadata_address = url2base.get(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
# Example:
# 'block-device-mapping':
# {'ami': '/dev/sda1',
# 'ephemeral0': '/dev/sdb',
# 'root': '/dev/sda1'}
found = None
bdm = self.metadata['block-device-mapping']
for (entname, device) in bdm.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 is None:
LOG.debug("Unable to convert %s to a device", name)
return None
ofound = found
if not found.startswith("/"):
found = "/dev/%s" % found
if os.path.exists(found):
return found
remapped = self._remap_device(os.path.basename(found))
if remapped:
LOG.debug("Remapped device name %s => %s", found, remapped)
return remapped
# On t1.micro, ephemeral0 will appear in block-device-mapping from
# metadata, but it will not exist on disk (and never will)
# at this point, 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
@property
def availability_zone(self):
try:
return self.metadata['placement']['availability-zone']
except KeyError:
return None
@property
def region(self):
az = self.availability_zone
if az is not None:
return az[:-1]
return None
# Used to match classes to dependencies
datasources = [
(DataSourceEc2, (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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