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# vi: ts=4 expandtab
#
# Copyright (C) 2011 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 DataSource
import cloudinit
import cloudinit.util as util
import sys
import os.path
import os
import errno
from xml.dom import minidom
from xml.dom import Node
class DataSourceOVF(DataSource.DataSource):
seed = None
seeddir = cloudinit.seeddir + '/ovf'
def __init__(self):
pass
def __str__(self):
mstr="DataSourceOVF"
mstr = mstr + " [seed=%s]" % self.seed
return(mstr)
def get_data(self):
(seedfile, contents) = get_ovf_env(seeddir)
if seedfile:
# found a seed dir
self.seed = "%s/%s" % (dirname,seedfile)
ret = read_ovf_environment(contents)
# self.user_data=ret['user-data']
# self.meta_data=ret['meta-data']
return(True)
(dev, fname, contents) = find_ovf_env()
if not dev:
return(False)
ret = read_ovf_environment(contents)
# self.user_data=ret['user-data']
# self.meta_data=ret['meta-data']
return(True)
# this will return a dict with some content
# meta-data, user-data
def read_ovf_environment(contents):
# this should basically shove into python objects
# the values we read from ovf environment
self.metadata = md;
self.userdata_raw = ud
# returns tuple of filename (in 'dirname', and the contents of the file)
# on "not found", returns 'None' for filename and False for contents
def get_ovf_env(dirname):
env_names = ("ovf-env.xml", "ovf_env.xml", "OVF_ENV.XML", "OVF-ENV.XML" )
for fname in env_names:
if os.path.isfile("%s/%s" % (dirname,fname)):
fp = open("%s/%s" % (dirname,fname))
contents = fp.read()
fp.close()
return(fname,contents)
return(None,False)
def find_ovf_env(require_iso=False):
# default_regex matches values in
# /lib/udev/rules.d/60-cdrom_id.rules
# KERNEL!="sr[0-9]*|hd[a-z]|xvd*", GOTO="cdrom_end"
envname = "CLOUD_INIT_CDROM_DEV_REGEX"
default_regex = "^(sr[0-9]+|hd[a-z]|xvd.*)"
devname_regex = os.environ.get(envname,default_regex)
cdmatch = re.compile(devname_regex)
# go through mounts to see if it was already mounted
fp = open("/proc/mounts")
mounts = fp.readlines()
fp.close()
mounted = { }
for mpline in mounts:
(dev,mp,fstype,opts,freq,passno) = mpline.split()
mounted[dev]=(dev,fstype,mp,False)
mp = mp.replace("\\040"," ")
if fstype != "iso9660" and require_iso: continue
if cdmatch.match(dev[5:]) == None: # take off '/dev/'
continue
(fname,contents) = get_ovf_env(mp)
if contents is not False:
return (dev,fname,contents)
tmpd = None
dvnull = None
devs = os.listdir("/dev/")
devs.sort()
for dev in devs:
fullp = "/dev/%s" % dev
if fullp in mounted or not cdmatch.match(dev) or os.path.isdir(fullp):
continue
if tmpd is None:
tmpd = tempfile.mkdtemp()
if dvnull is None:
try:
dvnull = open("/dev/null")
except:
pass
cmd = [ "mount", "-o", "ro", fullp, tmpd ]
if require_iso: cmd.extend(('-t','iso9660'))
rc = subprocess.call(cmd, stderr=dvnull, stdout=dvnull, stdin=dvnull)
if rc:
continue
(fname,contents) = get_ovf_env(tmpd)
subprocess.call(["umount", tmpd])
if contents is not False:
os.rmdir(tmpd)
return (fullp,fname,contents)
if tmpd:
os.rmdir(tmpd)
if dvnull:
dvnull.close()
return (None,None,False)
def findChild(node,filter_func):
ret = []
if not node.hasChildNodes(): return ret
for child in node.childNodes:
if filter_func(child): ret.append(child)
return(ret)
def getProperties(environString):
dom = minidom.parseString(environString)
if dom.documentElement.localName != "Environment":
raise Exception("No Environment Node")
if not dom.documentElement.hasChildNodes():
raise Exception("No Child Nodes")
envNsURI = "http://schemas.dmtf.org/ovf/environment/1"
# could also check here that elem.namespaceURI ==
# "http://schemas.dmtf.org/ovf/environment/1"
propSections = findChild(dom.documentElement,
lambda n: n.localName == "PropertySection")
if len(propSections) == 0:
raise Exception("No 'PropertySection's")
props = { }
propElems = findChild(propSections[0], lambda n: n.localName == "Property")
for elem in propElems:
key = elem.attributes.getNamedItemNS(envNsURI,"key").value
val = elem.attributes.getNamedItemNS(envNsURI,"value").value
props[key] = val
return(props)
if __name__ == "__main__":
import sys
envStr = open(sys.argv[1]).read()
props = getProperties(envStr)
import pprint
pprint.pprint(props)
read_ovf_environment
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