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"""
Serializer code for cobbler
Copyright 2006-2008, Red Hat, Inc
Michael DeHaan <mdehaan@redhat.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
"""
import distutils.sysconfig
import os
import sys
import glob
import traceback
plib = distutils.sysconfig.get_python_lib()
mod_path="%s/cobbler" % plib
sys.path.insert(0, mod_path)
from utils import _
import utils
import yaml # Howell-Clark version
from cexceptions import *
import os
def register():
"""
The mandatory cobbler module registration hook.
"""
return "serializer"
def serialize_item(obj, item):
filename = "/var/lib/cobbler/config/%ss.d/%s" % (obj.collection_type(),item.name)
datastruct = item.to_datastruct()
fd = open(filename,"w+")
ydata = yaml.dump(datastruct)
if ydata is None or ydata == "":
raise CX("internal yaml error, tried to write empty file to %s, data was %s" % (filename, datastruct))
fd.write(ydata)
fd.close()
return True
def serialize_delete(obj, item):
filename = "/var/lib/cobbler/config/%ss.d/%s" % (obj.collection_type(),item.name)
if os.path.exists(filename):
os.remove(filename)
return True
def deserialize_item_raw(collection_type, item_name):
# this new fn is not really implemented performantly in this module.
# yet.
filename = "/var/lib/cobbler/config/%ss.d/%s" % (collection_type,item_name)
if not os.path.exists(filename):
return None
fd = open(filename)
datastruct = yaml.load(fd.read()).next()
fd.close()
return datastruct
def serialize(obj):
"""
Save an object to disk. Object must "implement" Serializable.
FIXME: Return False on access/permission errors.
This should NOT be used by API if serialize_item is available.
"""
ctype = obj.collection_type()
if ctype == "settings":
return True
for x in obj:
serialize_item(obj,x)
return True
def deserialize_raw(collection_type):
old_filename = "/var/lib/cobbler/%ss" % collection_type
if collection_type == "settings":
fd = open("/etc/cobbler/settings")
datastruct = yaml.load(fd.read()).next()
fd.close()
return datastruct
elif os.path.exists(old_filename):
# for use in migration
sys.stderr.write("reading from old config format: %s\n" % old_filename)
fd = open(old_filename)
datastruct = yaml.load(fd.read()).next()
fd.close()
return datastruct
else:
results = []
files = glob.glob("/var/lib/cobbler/config/%ss.d/*" % collection_type)
for f in files:
fd = open(f)
ydata = fd.read()
if ydata is None or ydata == "":
raise CX("error, empty file %s" % f)
try:
records = yaml.load(ydata)
datastruct = records.next()
except:
raise CX("error parsing yaml file: %s" % f)
results.append(datastruct)
fd.close()
return results
def deserialize(obj,topological=True):
"""
Populate an existing object with the contents of datastruct.
Object must "implement" Serializable.
"""
old_filename = "/var/lib/cobbler/%ss" % obj.collection_type()
datastruct = deserialize_raw(obj.collection_type())
if topological and type(datastruct) == list:
datastruct.sort(__depth_cmp)
obj.from_datastruct(datastruct)
if os.path.exists(old_filename):
# we loaded it in from the old filename, so now migrate to new fmt
sys.stderr.write("auto-removing old config format: %s\n" % old_filename)
serialize(obj)
os.remove(old_filename)
return True
def __depth_cmp(item1, item2):
d1 = item1.get("depth",1)
d2 = item2.get("depth",1)
return cmp(d1,d2)
if __name__ == "__main__":
print deserialize_item_raw("distro","D1")
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