115 lines
3.4 KiB
Python
115 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2010-2011 Steven Armstrong (steven-cdist at armstrong.cc)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import os
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import cdist
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import cdist.path
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class Object(object):
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"""Represents a cdist object.
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All interaction with objects in cdist should be done through this class.
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Directly accessing an object through the file system from python code is
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a bug.
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"""
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@staticmethod
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def base_dir():
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"""Return the absolute path to the top level directory where objects
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are defined.
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Requires the environment variable '__cdist_out_dir' to be set.
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"""
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try:
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base_dir = os.path.join(
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os.environ['__cdist_out_dir'],
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'object'
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)
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except KeyError as e:
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raise cdist.MissingEnvironmentVariableError(e.args[0])
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# FIXME: should directory be created elsewhere?
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if not os.path.isdir(base_dir):
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os.mkdir(base_dir)
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return base_dir
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@classmethod
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def list_objects(cls):
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"""Return a list of object instances"""
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for object_name in cls.list_object_names():
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type_name = object_name.split(os.sep)[0]
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object_id = os.sep.join(object_name.split(os.sep)[1:])
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yield cls(Type(type_name), object_id=object_id)
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@classmethod
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def list_type_names(cls):
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"""Return a list of type names"""
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return os.listdir(cls.base_dir())
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@classmethod
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def list_object_names(cls):
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"""Return a list of object names"""
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for path, dirs, files in os.walk(cls.base_dir()):
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# FIXME: use constant instead of string
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if cdist.path.DOT_CDIST in dirs:
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yield os.path.relpath(path, cls.base_dir())
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def __init__(self, type, object_id=None, parameter=None, requirements=None):
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self.type = type # instance of Type
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self.object_id = object_id
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self.qualified_name = os.path.join(self.type.name, self.object_id)
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self.parameter = parameter or {}
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self.requirements = requirements or []
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def __repr__(self):
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return '<Object %s>' % self.qualified_name
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@property
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def path(self):
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return os.path.join(
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self.base_dir(),
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self.qualified_name,
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cdist.path.DOT_CDIST
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)
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@property
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def changed(self):
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"""Check whether the object has been changed."""
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return os.path.isfile(os.path.join(self.path, "changed"))
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@changed.setter
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def changed(self, value):
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"""Change the objects changed status."""
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path = os.path.join(self.path, "changed")
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if value:
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open(path, "w").close()
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else:
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try:
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os.remove(path)
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except EnvironmentError:
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# ignore
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pass
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# FIXME: implement other properties/methods
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