/usr/lib/python2.7/dist-packages/cobbler/serializer.py is in python-cobbler 2.4.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | """
Serializer code for cobbler
Now adapted to support different storage backends
Copyright 2006-2009, Red Hat, Inc and Others
Michael DeHaan <michael.dehaan AT gmail>
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 errno
import os
from utils import _
import fcntl
import traceback
import sys
import signal
import time
from cexceptions import *
import api as cobbler_api
LOCK_ENABLED = True
LOCK_HANDLE = None
def handler(num,frame):
print >> sys.stderr, "Ctrl-C not allowed during writes. Please wait."
return True
def __grab_lock():
"""
Dual purpose locking:
(A) flock to avoid multiple process access
(B) block signal handler to avoid ctrl+c while writing YAML
"""
try:
if LOCK_ENABLED:
if not os.path.exists("/var/lib/cobbler/lock"):
fd = open("/var/lib/cobbler/lock","w+")
fd.close()
LOCK_HANDLE = open("/var/lib/cobbler/lock","r")
fcntl.flock(LOCK_HANDLE.fileno(), fcntl.LOCK_EX)
return True
except:
# this is pretty much FATAL, avoid corruption and quit now.
traceback.print_exc()
sys.exit(7)
def __release_lock(with_changes=False):
if with_changes:
# this file is used to know when the last config change
# was made -- allowing the API to work more smoothly without
# a lot of unneccessary reloads.
fd = os.open("/var/lib/cobbler/.mtime", os.O_CREAT|os.O_RDWR, 0200)
os.write(fd, "%f" % time.time())
os.close(fd)
if LOCK_ENABLED:
LOCK_HANDLE = open("/var/lib/cobbler/lock","r")
fcntl.flock(LOCK_HANDLE.fileno(), fcntl.LOCK_UN)
LOCK_HANDLE.close()
return True
def serialize(obj):
"""
Save a collection to disk or other storage.
"""
__grab_lock()
storage_module = __get_storage_module(obj.collection_type())
storage_module.serialize(obj)
__release_lock()
return True
def serialize_item(collection, item):
"""
Save an item.
"""
__grab_lock()
storage_module = __get_storage_module(collection.collection_type())
save_fn = getattr(storage_module, "serialize_item", None)
if save_fn is None:
rc = storage_module.serialize(collection)
else:
rc = save_fn(collection,item)
__release_lock(with_changes=True)
return rc
def serialize_delete(collection, item):
"""
Delete an object from a saved state.
"""
__grab_lock()
storage_module = __get_storage_module(collection.collection_type())
delete_fn = getattr(storage_module, "serialize_delete", None)
if delete_fn is None:
rc = storage_module.serialize(collection)
else:
rc = delete_fn(collection,item)
__release_lock(with_changes=True)
return rc
def deserialize(obj,topological=True):
"""
Fill in an empty collection from disk or other storage
"""
__grab_lock()
storage_module = __get_storage_module(obj.collection_type())
rc = storage_module.deserialize(obj,topological)
__release_lock()
return rc
def deserialize_raw(collection_type):
"""
Return the datastructure corresponding to the serialized
disk state, without going through the Cobbler object system.
Much faster, when you don't need the objects.
"""
__grab_lock()
storage_module = __get_storage_module(collection_type)
rc = storage_module.deserialize_raw(collection_type)
__release_lock()
return rc
def deserialize_item(collection_type, item_name):
"""
Get a specific record.
"""
__grab_lock()
storage_module = __get_storage_module(collection_type)
rc = storage_module.deserialize_item(collection_type, item_name)
__release_lock()
return rc
def deserialize_item_raw(collection_type, item_name):
__grab_lock()
storage_module = __get_storage_module(collection_type)
rc = storage_module.deserialize_item_raw(collection_type, item_name)
__release_lock()
return rc
def __get_storage_module(collection_type):
"""
Look up serializer in /etc/cobbler/modules.conf
"""
capi = cobbler_api.BootAPI()
return capi.get_module_from_file("serializers",collection_type,"serializer_catalog")
if __name__ == "__main__":
__grab_lock()
__release_lock()
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