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#!/usr/bin/python
"""
Module loader, adapted for cobbler usage
Copyright 2006-2007, Red Hat, Inc
Adrian Likins <alikins@redhat.com>
Michael DeHaan <mdehaan@redhat.com>
This software may be freely redistributed under the terms of the GNU
general public license.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
import distutils.sysconfig
import os
import sys
import glob
from utils import _
from cexceptions import *
import ConfigParser
MODULE_CACHE = {}
MODULES_BY_CATEGORY = {}
cp = ConfigParser.ConfigParser()
cp.read("/etc/cobbler/modules.conf")
plib = distutils.sysconfig.get_python_lib()
mod_path="%s/cobbler/modules" % plib
sys.path.insert(0, mod_path)
sys.path.insert(1, "%s/cobbler" % plib)
def load_modules(module_path=mod_path, blacklist=None):
filenames = glob.glob("%s/*.py" % module_path)
filenames = filenames + glob.glob("%s/*.pyc" % module_path)
filesnames = filenames + glob.glob("%s/*.pyo" % module_path)
mods = {}
for fn in filenames:
basename = os.path.basename(fn)
if basename == "__init__.py":
continue
if basename[-3:] == ".py":
modname = basename[:-3]
elif basename[-4:] in [".pyc", ".pyo"]:
modname = basename[:-4]
try:
blip = __import__("modules.%s" % ( modname), globals(), locals(), [modname])
if not hasattr(blip, "register"):
if not modname.startswith("__init__"):
errmsg = _("%(module_path)s/%(modname)s is not a proper module")
print errmsg % {'module_path': module_path, 'modname':modname}
continue
category = blip.register()
if category:
MODULE_CACHE[modname] = blip
if not MODULES_BY_CATEGORY.has_key(category):
MODULES_BY_CATEGORY[category] = {}
MODULES_BY_CATEGORY[category][modname] = blip
except ImportError, e:
print e
raise
return (MODULE_CACHE, MODULES_BY_CATEGORY)
def get_module_by_name(name):
return MODULE_CACHE.get(name, None)
def get_module_from_file(category,field,fallback_module_name=None):
try:
value = cp.get(category,field)
except:
if fallback_module_name is not None:
value = fallback_module_name
else:
raise CX(_("Cannot find config file setting for: %s") % field)
rc = MODULE_CACHE.get(value, None)
if rc is None:
raise CX(_("Failed to load module for %s/%s") % (category,field))
return rc
def get_modules_in_category(category):
if not MODULES_BY_CATEGORY.has_key(category):
return []
return MODULES_BY_CATEGORY[category].values()
if __name__ == "__main__":
print load_modules(module_path)
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