212 lines
7.8 KiB
Python
212 lines
7.8 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
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# 2011-2012 Nico Schottelius (nico-cdist at schottelius.org)
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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 logging
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import os
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import collections
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import cdist
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import cdist.core
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from cdist.util import fsproperty
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log = logging.getLogger(__name__)
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OBJECT_MARKER = '.cdist'
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class IllegalObjectIdError(cdist.Error):
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def __init__(self, object_id, message=None):
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self.object_id = object_id
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self.message = message or 'Illegal object id'
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def __str__(self):
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return '%s: %s' % (self.message, self.object_id)
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class CdistObject(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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# Constants for use with Object.state
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STATE_PREPARED = "prepared"
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STATE_RUNNING = "running"
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STATE_DONE = "done"
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@classmethod
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def list_objects(cls, object_base_path, type_base_path):
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"""Return a list of object instances"""
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for object_name in cls.list_object_names(object_base_path):
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type_name, object_id = cls.split_name(object_name)
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yield cls(cdist.core.CdistType(type_base_path, type_name), object_base_path, object_id=object_id)
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@classmethod
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def list_type_names(cls, object_base_path):
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"""Return a list of type names"""
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return os.listdir(object_base_path)
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@classmethod
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def list_object_names(cls, object_base_path):
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"""Return a list of object names"""
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for path, dirs, files in os.walk(object_base_path):
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if OBJECT_MARKER in dirs:
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yield os.path.relpath(path, object_base_path)
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@staticmethod
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def split_name(object_name):
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"""split_name('__type_name/the/object_id') -> ('__type_name', 'the/object_id')
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Split the given object name into it's type and object_id parts.
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"""
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type_name = object_name.split(os.sep)[0]
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# FIXME: allow object without object_id? e.g. for singleton
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object_id = os.sep.join(object_name.split(os.sep)[1:])
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return type_name, object_id
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@staticmethod
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def join_name(type_name, object_id):
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"""join_name('__type_name', 'the/object_id') -> __type_name/the/object_id'
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Join the given type_name and object_id into an object name.
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"""
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return os.path.join(type_name, object_id)
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def validate_object_id(self):
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# FIXME: also check that there is no object ID when type is singleton?
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"""Validate the given object_id and raise IllegalObjectIdError if it's not valid.
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"""
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if self.object_id:
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if self.object_id.startswith('/'):
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raise IllegalObjectIdError(self.object_id, 'object_id may not start with /')
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if OBJECT_MARKER in self.object_id.split(os.sep):
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raise IllegalObjectIdError(self.object_id, 'object_id may not contain \'%s\'' % OBJECT_MARKER)
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if '//' in self.object_id:
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raise IllegalObjectIdError(self.object_id, 'object_id may not contain //')
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# If no object_id and type is not singleton => error out
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if not self.object_id and not self.cdist_type.is_singleton:
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raise IllegalObjectIdError(self.object_id,
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"Missing object_id and type is not a singleton.")
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def __init__(self, cdist_type, base_path, object_id=None):
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self.cdist_type = cdist_type # instance of Type
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self.base_path = base_path
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self.object_id = object_id
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self.sanitise_object_id()
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self.validate_object_id()
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self.name = self.join_name(self.cdist_type.name, self.object_id)
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self.path = os.path.join(self.cdist_type.path, self.object_id, OBJECT_MARKER)
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self.absolute_path = os.path.join(self.base_path, self.path)
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self.code_local_path = os.path.join(self.path, "code-local")
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self.code_remote_path = os.path.join(self.path, "code-remote")
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self.parameter_path = os.path.join(self.path, "parameter")
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def object_from_name(self, object_name):
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"""Convenience method for creating an object instance from an object name.
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Mainly intended to create objects when resolving requirements.
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e.g:
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<CdistObject __foo/bar>.object_from_name('__other/object') -> <CdistObject __other/object>
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"""
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base_path = self.base_path
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type_path = self.cdist_type.base_path
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type_name, object_id = self.split_name(object_name)
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cdist_type = self.cdist_type.__class__(type_path, type_name)
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return self.__class__(cdist_type, base_path, object_id=object_id)
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def __repr__(self):
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return '<CdistObject %s>' % self.name
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def __eq__(self, other):
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"""define equality as 'name is the same'"""
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return self.name == other.name
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def __hash__(self):
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return hash(self.name)
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def __lt__(self, other):
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return isinstance(other, self.__class__) and self.name < other.name
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def sanitise_object_id(self):
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"""
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Remove leading and trailing slash (one only)
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"""
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# Allow empty object id for singletons
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if self.object_id:
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# Remove leading slash
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if self.object_id[0] == '/':
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self.object_id = self.object_id[1:]
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# Remove trailing slash
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if self.object_id[-1] == '/':
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self.object_id = self.object_id[:-1]
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# FIXME: still needed?
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@property
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def explorer_path(self):
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"""Create and return the relative path to this objects explorers"""
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# create absolute path
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path = os.path.join(self.absolute_path, "explorer")
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if not os.path.isdir(path):
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os.mkdir(path)
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# return relative path
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return os.path.join(self.path, "explorer")
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requirements = fsproperty.FileListProperty(lambda obj: os.path.join(obj.absolute_path, 'require'))
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parameters = fsproperty.DirectoryDictProperty(lambda obj: os.path.join(obj.base_path, obj.parameter_path))
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explorers = fsproperty.DirectoryDictProperty(lambda obj: os.path.join(obj.base_path, obj.explorer_path))
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changed = fsproperty.FileBooleanProperty(lambda obj: os.path.join(obj.absolute_path, "changed"))
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state = fsproperty.FileStringProperty(lambda obj: os.path.join(obj.absolute_path, "state"))
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source = fsproperty.FileListProperty(lambda obj: os.path.join(obj.absolute_path, "source"))
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code_local = fsproperty.FileStringProperty(lambda obj: os.path.join(obj.base_path, obj.code_local_path))
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code_remote = fsproperty.FileStringProperty(lambda obj: os.path.join(obj.base_path, obj.code_remote_path))
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@property
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def exists(self):
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"""Checks wether this cdist object exists on the file systems."""
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return os.path.exists(self.absolute_path)
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def create(self):
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"""Create this cdist object on the filesystem.
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"""
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try:
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os.makedirs(self.absolute_path, exist_ok=False)
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absolute_parameter_path = os.path.join(self.base_path, self.parameter_path)
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os.makedirs(absolute_parameter_path, exist_ok=False)
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except EnvironmentError as error:
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raise cdist.Error('Error creating directories for cdist object: %s: %s' % (self, error))
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