382 lines
16 KiB
Python
382 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2011-2015 Nico Schottelius (nico-cdist at schottelius.org)
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# 2012-2013 Steven Armstrong (steven-cdist at armstrong.cc)
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# 2014 Daniel Heule (hda at sfs.biz)
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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 argparse
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import logging
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import os
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import sys
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import cdist
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from cdist import core
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from cdist import flock
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class MissingRequiredEnvironmentVariableError(cdist.Error):
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def __init__(self, name):
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self.name = name
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self.message = ("Emulator requires the environment variable %s to be "
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"setup" % self.name)
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def __str__(self):
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return self.message
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class DefaultList(list):
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"""Helper class to allow default values for optional_multiple parameters.
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@see https://groups.google.com/forum/#!msg/comp.lang.python/sAUvkJEDpRc/RnRymrzJVDYJ
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"""
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def __copy__(self):
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return []
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@classmethod
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def create(cls, initial=None):
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if initial:
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return cls(initial.split('\n'))
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class Emulator(object):
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def __init__(self, argv, stdin=sys.stdin.buffer, env=os.environ):
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self.argv = argv
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self.stdin = stdin
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self.env = env
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self.object_id = ''
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try:
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self.global_path = self.env['__global']
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self.target_host = (
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self.env['__target_host'],
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self.env['__target_hostname'],
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self.env['__target_fqdn']
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)
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# Internal variables
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self.object_source = self.env['__cdist_manifest']
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self.type_base_path = self.env['__cdist_type_base_path']
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self.object_marker = self.env['__cdist_object_marker']
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except KeyError as e:
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raise MissingRequiredEnvironmentVariableError(e.args[0])
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self.object_base_path = os.path.join(self.global_path, "object")
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self.typeorder_path = os.path.join(self.global_path, "typeorder")
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self.type_name = os.path.basename(argv[0])
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self.cdist_type = core.CdistType(self.type_base_path, self.type_name)
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# If set then object alreay exists and this var holds existing
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# requirements.
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self._existing_reqs = None
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self.__init_log()
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def run(self):
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"""Emulate type commands (i.e. __file and co)"""
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self.commandline()
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self.init_object()
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# locking for parallel execution
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with flock.Flock(self.flock_path):
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self.setup_object()
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self.save_stdin()
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self.record_requirements()
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self.record_auto_requirements()
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self.log.trace("Finished %s %s" % (
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self.cdist_object.path, self.parameters))
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def __init_log(self):
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"""Setup logging facility"""
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if '__cdist_log_level' in self.env:
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try:
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loglevel = self.env['__cdist_log_level']
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level = int(loglevel)
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except ValueError:
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level = logging.WARNING
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else:
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level = logging.WARNING
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try:
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logging.root.setLevel(level)
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except (ValueError, TypeError):
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# if invalid __cdist_log_level value
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logging.root.setLevel(logging.WARNING)
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self.log = logging.getLogger(self.target_host[0])
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def commandline(self):
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"""Parse command line"""
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parser = argparse.ArgumentParser(add_help=False,
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argument_default=argparse.SUPPRESS)
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for parameter in self.cdist_type.required_parameters:
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argument = "--" + parameter
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parser.add_argument(argument, dest=parameter, action='store',
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required=True)
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for parameter in self.cdist_type.required_multiple_parameters:
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argument = "--" + parameter
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parser.add_argument(argument, dest=parameter, action='append',
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required=True)
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for parameter in self.cdist_type.optional_parameters:
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argument = "--" + parameter
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default = self.cdist_type.parameter_defaults.get(parameter, None)
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parser.add_argument(argument, dest=parameter, action='store',
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required=False, default=default)
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for parameter in self.cdist_type.optional_multiple_parameters:
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argument = "--" + parameter
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default = DefaultList.create(
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self.cdist_type.parameter_defaults.get(
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parameter, None))
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parser.add_argument(argument, dest=parameter, action='append',
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required=False, default=default)
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for parameter in self.cdist_type.boolean_parameters:
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argument = "--" + parameter
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parser.add_argument(argument, dest=parameter,
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action='store_const', const='')
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# If not singleton support one positional parameter
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if not self.cdist_type.is_singleton:
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parser.add_argument("object_id", nargs=1)
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# And finally parse/verify parameter
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self.args = parser.parse_args(self.argv[1:])
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self.log.trace('Args: %s' % self.args)
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def init_object(self):
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# Initialize object - and ensure it is not in args
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if self.cdist_type.is_singleton:
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self.object_id = ''
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else:
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self.object_id = self.args.object_id[0]
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del self.args.object_id
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# Instantiate the cdist object we are defining
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self.cdist_object = core.CdistObject(
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self.cdist_type, self.object_base_path, self.object_marker,
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self.object_id)
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lockfname = ('.' + self.cdist_type.name +
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self.object_id + '_' +
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self.object_marker + '.lock')
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lockfname = lockfname.replace(os.sep, '_')
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self.flock_path = os.path.join(self.object_base_path, lockfname)
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def _object_params_in_context(self):
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''' Get cdist_object parameters dict adopted by context.
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Context consists of cdist_type boolean, optional, required,
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optional_multiple and required_multiple parameters. If parameter
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is multiple parameter then its value is a list.
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This adaptation works on cdist_object.parameters which are read from
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directory based dict where it is unknown what kind of data is in
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file. If there is only one line in the file it is unknown if this
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is a value of required/optional parameter or if it is one value of
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multiple values parameter.
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'''
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params = {}
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if self.cdist_object.exists:
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for param in self.cdist_object.parameters:
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value = ('' if param in self.cdist_type.boolean_parameters
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else self.cdist_object.parameters[param])
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if ((param in self.cdist_type.required_multiple_parameters or
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param in self.cdist_type.optional_multiple_parameters) and
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not isinstance(value, list)):
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value = [value]
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params[param] = value
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return params
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def setup_object(self):
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# Create object with given parameters
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self.parameters = {}
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for key, value in vars(self.args).items():
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if value is not None:
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self.parameters[key] = value
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if self.cdist_object.exists and 'CDIST_OVERRIDE' not in self.env:
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# Make existing requirements a set so that we can compare it
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# later with new requirements.
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self._existing_reqs = set(self.cdist_object.requirements)
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obj_params = self._object_params_in_context()
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if obj_params != self.parameters:
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errmsg = ("Object %s already exists with conflicting "
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"parameters:\n%s: %s\n%s: %s" % (
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self.cdist_object.name,
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" ".join(self.cdist_object.source),
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obj_params,
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self.object_source,
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self.parameters))
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raise cdist.Error(errmsg)
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else:
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if self.cdist_object.exists:
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self.log.debug(('Object %s override forced with '
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'CDIST_OVERRIDE'), self.cdist_object.name)
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self.cdist_object.create(True)
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else:
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self.cdist_object.create()
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self.cdist_object.parameters = self.parameters
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# record the created object in typeorder file
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with open(self.typeorder_path, 'a') as typeorderfile:
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print(self.cdist_object.name, file=typeorderfile)
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# Record / Append source
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self.cdist_object.source.append(self.object_source)
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chunk_size = 65536
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def _read_stdin(self):
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return self.stdin.read(self.chunk_size)
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def save_stdin(self):
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"""If something is written to stdin, save it in the object as
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$__object/stdin so it can be accessed in manifest and gencode-*
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scripts.
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"""
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if not self.stdin.isatty():
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try:
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# go directly to file instead of using CdistObject's api
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# as that does not support streaming
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path = os.path.join(self.cdist_object.absolute_path, 'stdin')
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with open(path, 'wb') as fd:
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chunk = self._read_stdin()
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while chunk:
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fd.write(chunk)
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chunk = self._read_stdin()
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except EnvironmentError as e:
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raise cdist.Error('Failed to read from stdin: %s' % e)
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def record_requirement(self, requirement):
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"""record requirement and return recorded requirement"""
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# Raises an error, if object cannot be created
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try:
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cdist_object = self.cdist_object.object_from_name(requirement)
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except core.cdist_type.InvalidTypeError as e:
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self.log.error(("%s requires object %s, but type %s does not"
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" exist. Defined at %s" % (
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self.cdist_object.name,
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requirement, e.name, self.object_source)))
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raise
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except core.cdist_object.MissingObjectIdError:
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self.log.error(("%s requires object %s without object id."
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" Defined at %s" % (self.cdist_object.name,
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requirement,
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self.object_source)))
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raise
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self.log.debug("Recording requirement %s for %s",
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requirement, self.cdist_object.name)
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# Save the sanitised version, not the user supplied one
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# (__file//bar => __file/bar)
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# This ensures pattern matching is done against sanitised list
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self.cdist_object.requirements.append(cdist_object.name)
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return cdist_object.name
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def record_requirements(self):
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"""Record requirements."""
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# Inject the predecessor, but not if its an override
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# (this would leed to an circular dependency)
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if ("CDIST_ORDER_DEPENDENCY" in self.env and
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'CDIST_OVERRIDE' not in self.env):
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# load object name created befor this one from typeorder file ...
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with open(self.typeorder_path, 'r') as typecreationfile:
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typecreationorder = typecreationfile.readlines()
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# get the type created before this one ...
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try:
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lastcreatedtype = typecreationorder[-2].strip()
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# __object_name is the name of the object whose type
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# manifest is currently executed
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__object_name = self.env.get('__object_name', None)
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if lastcreatedtype == __object_name:
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self.log.debug(("Not injecting require for "
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"CDIST_ORDER_DEPENDENCY: %s for %s,"
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" %s's type manifest is currently"
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" being executed"),
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lastcreatedtype,
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self.cdist_object.name,
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lastcreatedtype)
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else:
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if 'require' in self.env:
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appendix = " " + lastcreatedtype
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if appendix not in self.env['require']:
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self.env['require'] += appendix
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else:
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self.env['require'] = lastcreatedtype
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self.log.debug(("Injecting require for "
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"CDIST_ORDER_DEPENDENCY: %s for %s"),
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lastcreatedtype,
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self.cdist_object.name)
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except IndexError:
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# if no second last line, we are on the first type,
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# so do not set a requirement
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pass
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reqs = set()
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if "require" in self.env:
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requirements = self.env['require']
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self.log.debug("reqs = " + requirements)
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for requirement in requirements.split(" "):
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# Ignore empty fields - probably the only field anyway
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if len(requirement) == 0:
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continue
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object_name = self.record_requirement(requirement)
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reqs.add(object_name)
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if self._existing_reqs is not None:
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# If object exists then compare existing and new requirements.
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if self._existing_reqs != reqs:
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warnmsg = ("Object {} already exists with requirements:\n"
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"{}: {}\n"
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"{}: {}\n"
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"Dependency resolver could not handle dependencies "
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"as expected.".format(
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self.cdist_object.name,
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" ".join(self.cdist_object.source),
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self._existing_reqs,
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self.object_source,
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reqs
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))
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self.log.warning(warnmsg)
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def record_auto_requirements(self):
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"""An object shall automatically depend on all objects that it
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defined in it's type manifest.
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"""
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# __object_name is the name of the object whose type manifest is
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# currently executed
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__object_name = self.env.get('__object_name', None)
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if __object_name:
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# The object whose type manifest is currently run
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parent = self.cdist_object.object_from_name(__object_name)
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# The object currently being defined
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current_object = self.cdist_object
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# As parent defined current_object it shall automatically
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# depend on it.
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# But only if the user hasn't said otherwise.
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# Must prevent circular dependencies.
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if parent.name not in current_object.requirements:
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self.log.debug("Recording autorequirement %s for %s",
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current_object.name, parent.name)
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parent.autorequire.append(current_object.name)
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