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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Yahoo! Inc.
# Copyright (C) 2012 CERIT Scientific Cloud
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Vlastimil Holer <xholer@mail.muni.cz>
#
# 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 re
import subprocess
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import util
LOG = logging.getLogger(__name__)
DEFAULT_IID = "iid-dsopennebula"
CONTEXT_DISK_FILES = ["context.sh"]
VALID_DSMODES = ("local", "net", "disabled")
class DataSourceOpenNebula(sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.dsmode = 'local'
self.seed = None
self.seed_dir = os.path.join(paths.seed_dir, 'opennebula')
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": DEFAULT_IID,
"dsmode": self.dsmode,
}
found = None
md = {}
results = {}
if os.path.isdir(self.seed_dir):
try:
results=read_on_context_device_dir(self.seed_dir)
found = self.seed_dir
except NonContextDeviceDir:
util.logexc(LOG, "Failed reading context device from %s",
self.seed_dir)
if not found:
devlist = find_candidate_devs()
for dev in devlist:
try:
results = util.mount_cb(dev, read_context_disk_dir)
found = dev
break
except (NonConfigDriveDir, util.MountFailedError):
pass
except BrokenConfigDriveDir:
util.logexc(LOG, "broken config drive: %s", dev)
if not found:
return False
md = results['metadata']
md = util.mergedict(md, defaults)
dsmode = results.get('dsmode', None)
if dsmode not in VALID_DSMODES + (None,):
LOG.warn("user specified invalid mode: %s" % dsmode)
dsmode = None
if (dsmode is None) and self.ds_cfg.get('dsmode'):
dsmode = self.ds_cfg.get('dsmode')
else:
dsmode = self.dsmode
if dsmode == "disabled":
# most likely user specified
return False
if dsmode != self.dsmode:
LOG.debug("%s: not claiming datasource, dsmode=%s", self, dsmode)
return False
self.seed = found
self.metadata = md
self.userdata_raw = results.get('userdata')
return True
def get_hostname(self, fqdn=False, resolve_ip=None):
if resolve_ip is None:
if self.dsmode == 'net':
resolve_ip = True
else:
resolve_ip = False
return sources.DataSource.get_hostname(self, fqdn, resolve_ip)
class DataSourceOpenNebulaNet(DataSourceOpenNebula):
def __init__(self, sys_cfg, distro, paths):
DataSourceOpenNebula.__init__(self, sys_cfg, distro, paths)
self.dsmode = 'net'
class NonContextDeviceDir(Exception):
pass
def find_candidate_devs():
"""
Return a list of devices that may contain the context disk.
"""
by_fstype = util.find_devs_with("TYPE=iso9660")
by_label = util.find_devs_with("LABEL=CDROM")
by_fstype.sort()
by_label.sort()
# combine list of items by putting by-label items first
# followed by fstype items, but with dupes removed
combined = (by_label + [d for d in by_fstype if d not in by_label])
# We are looking for block device (sda, not sda1), ignore partitions
combined = [d for d in combined if d[-1] not in "0123456789"]
return combined
def read_context_disk_dir(source_dir):
"""
read_context_disk_dir(source_dir):
read source_dir and return a tuple with metadata dict and user-data
string populated. If not a valid dir, raise a NonContextDeviceDir
"""
found = {}
for af in CONTEXT_DISK_FILES:
fn = os.path.join(source_dir, af)
if os.path.isfile(fn):
found[af] = fn
if len(found) == 0:
raise NonContextDeviceDir("%s: %s" % (source_dir, "no files found"))
context_sh = {}
results = {
'userdata':None,
'metadata':{},
}
if "context.sh" in found:
try:
# Note: context.sh is a "shell" script with defined context
# variables, like: X="Y" . It's ready to use as a shell source
# e.g.: ". context.sh" and as a shell script it can also reference
# to already defined shell variables. So to have same context var.
# values as we can have in custom shell script, we use bash itself
# to read context.sh and dump variables in easily parsable way.
#
# normalized variables dump format (get by cmd "set"):
# 1. simple single word assignment ........ X=Y
# 2. multiword assignment ................. X='Y Z'
# 3. assignments with backslash escapes ... X=$'Y\nZ'
#
# how context variables are read:
# 1. list existing ("old") shell variables and store into $VARS
# 2. read context variables
# 3. use comm to filter "old" variables from all current
# variables and excl. few other vars with grep
BASH_CMD='VARS=`set | sort -u `;' \
'. %s/context.sh;' \
'comm -23 <(set | sort -u) <(echo "$VARS") | egrep -v "^(VARS|PIPESTATUS|_)="'
(out,err) = util.subp(['bash',
'--noprofile',
'--norc',
'-c',
BASH_CMD % (source_dir) ])
for (key,value) in [ l.split('=',1) for l in out.rstrip().split("\n") ]:
# with backslash escapes
r=re.match("^\$'(.*)'$",value)
if r:
context_sh[key.lower()]=r.group(1).decode('string_escape')
else:
# multiword values
r=re.match("^'(.*)'$",value)
if r:
context_sh[key.lower()]=r.group(1)
else:
# simple values
context_sh[key.lower()]=value
except subprocess.CalledProcessError as exc:
LOG.warn("context script faled to read" % (exc.output[1]))
results['metadata']=context_sh
# process single or multiple SSH keys
if "ssh_key" in context_sh:
lines = context_sh.get('ssh_key').splitlines()
results['metadata']['public-keys'] = [l for l in lines
if len(l) and not l.startswith("#")]
# custom hostname
if 'hostname' in context_sh:
results['metadata']['local-hostname'] = context_sh['hostname']
elif 'public_ip'in context_sh:
results['metadata']['local-hostname'] = context_sh['public_ip']
# raw user data
if "user_data" in context_sh:
results['userdata'] = context_sh["user_data"]
elif "userdata" in context_sh:
results['userdata'] = context_sh["userdata"]
return results
# Used to match classes to dependencies
datasources = [
(DataSourceOpenNebula, (sources.DEP_FILESYSTEM, )),
(DataSourceOpenNebulaNet, (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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