cdist-backup/lib/cdist/core/object.py
Steven Armstrong 41ab7390db use constant instead of string for .cdist
Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
2011-10-06 13:02:08 +02:00

115 lines
3.4 KiB
Python

# -*- coding: utf-8 -*-
#
# 2010-2011 Steven Armstrong (steven-cdist at armstrong.cc)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
import os
import cdist
import cdist.path
class Object(object):
"""Represents a cdist object.
All interaction with objects in cdist should be done through this class.
Directly accessing an object through the file system from python code is
a bug.
"""
@staticmethod
def base_dir():
"""Return the absolute path to the top level directory where objects
are defined.
Requires the environment variable '__cdist_out_dir' to be set.
"""
try:
base_dir = os.path.join(
os.environ['__cdist_out_dir'],
'object'
)
except KeyError as e:
raise cdist.MissingEnvironmentVariableError(e.args[0])
# FIXME: should directory be created elsewhere?
if not os.path.isdir(base_dir):
os.mkdir(base_dir)
return base_dir
@classmethod
def list_objects(cls):
"""Return a list of object instances"""
for object_name in cls.list_object_names():
type_name = object_name.split(os.sep)[0]
object_id = os.sep.join(object_name.split(os.sep)[1:])
yield cls(Type(type_name), object_id=object_id)
@classmethod
def list_type_names(cls):
"""Return a list of type names"""
return os.listdir(cls.base_dir())
@classmethod
def list_object_names(cls):
"""Return a list of object names"""
for path, dirs, files in os.walk(cls.base_dir()):
# FIXME: use constant instead of string
if cdist.path.DOT_CDIST in dirs:
yield os.path.relpath(path, cls.base_dir())
def __init__(self, type, object_id=None, parameter=None, requirements=None):
self.type = type # instance of Type
self.object_id = object_id
self.qualified_name = os.path.join(self.type.name, self.object_id)
self.parameter = parameter or {}
self.requirements = requirements or []
def __repr__(self):
return '<Object %s>' % self.qualified_name
@property
def path(self):
return os.path.join(
self.base_dir(),
self.qualified_name,
cdist.path.DOT_CDIST
)
@property
def changed(self):
"""Check whether the object has been changed."""
return os.path.isfile(os.path.join(self.path, "changed"))
@changed.setter
def changed(self, value):
"""Change the objects changed status."""
path = os.path.join(self.path, "changed")
if value:
open(path, "w").close()
else:
try:
os.remove(path)
except EnvironmentError:
# ignore
pass
# FIXME: implement other properties/methods