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# config.py -- Portage Config
# Copyright 2007-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
__all__ = ["ConfigLoaderKlass", "GenericFile", "PackageKeywordsFile",
"PackageUseFile", "PackageMaskFile", "PortageModulesFile"]
from portage.cache.mappings import UserDict
from portage.env.loaders import KeyListFileLoader, KeyValuePairFileLoader, ItemFileLoader
class ConfigLoaderKlass(UserDict):
"""
A base class stub for things to inherit from.
Users may want a non-file backend.
"""
def __init__(self, loader):
"""
@param loader: A class that has a load() that returns two dicts
the first being a data dict, the second being a dict of errors.
"""
UserDict.__init__(self)
self._loader = loader
def load(self):
"""
Load the data from the loader.
@throws LoaderError:
"""
self.data, self.errors = self._loader.load()
class GenericFile(UserDict):
"""
Inherits from ConfigLoaderKlass, attempts to use all known loaders
until it gets <something> in data. This is probably really slow but is
helpful when you really have no idea what you are loading (hint hint the file
should perhaps declare what type it is? ;)
"""
loaders = [KeyListFileLoader, KeyValuePairFileLoader, ItemFileLoader]
def __init__(self, filename):
UserDict.__init__(self)
self.filename = filename
def load(self):
for loader in self.loaders:
l = loader(self.filename, None)
data, errors = l.load()
if len(data) and not len(errors):
(self.data, self.errors) = (data, errors)
return
class PackageKeywordsFile(ConfigLoaderKlass):
"""
Inherits from ConfigLoaderKlass; implements a file-based backend.
"""
default_loader = KeyListFileLoader
def __init__(self, filename):
super(PackageKeywordsFile, self).__init__(
self.default_loader(filename, validator=None))
class PackageUseFile(ConfigLoaderKlass):
"""
Inherits from PackageUse; implements a file-based backend. Doesn't handle recursion yet.
"""
default_loader = KeyListFileLoader
def __init__(self, filename):
super(PackageUseFile, self).__init__(
self.default_loader(filename, validator=None))
class PackageMaskFile(ConfigLoaderKlass):
"""
A class that implements a file-based package.mask
Entires in package.mask are of the form:
atom1
atom2
or optionally
-atom3
to revert a previous mask; this only works when masking files are stacked
"""
default_loader = ItemFileLoader
def __init__(self, filename):
super(PackageMaskFile, self).__init__(
self.default_loader(filename, validator=None))
class PortageModulesFile(ConfigLoaderKlass):
"""
File Class for /etc/portage/modules
"""
default_loader = KeyValuePairFileLoader
def __init__(self, filename):
super(PortageModulesFile, self).__init__(
self.default_loader(filename, validator=None))
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