forked from ungleich-public/cdist
222 lines
8.5 KiB
Python
222 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
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# 2012 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 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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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 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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initial = initial.split('\n')
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return cls(initial)
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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 = self.env['__target_host']
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# Internally only
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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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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.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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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.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.debug("Finished %s %s" % (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_debug' in self.env:
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logging.root.setLevel(logging.DEBUG)
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else:
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logging.root.setLevel(logging.INFO)
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self.log = logging.getLogger(self.target_host)
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def commandline(self):
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"""Parse command line"""
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parser = argparse.ArgumentParser(add_help=False, 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', 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', required=True)
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for parameter in self.cdist_type.optional_parameters:
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argument = "--" + parameter
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parser.add_argument(argument, dest=parameter, action='store', required=False,
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default=self.cdist_type.parameter_defaults.get(parameter, None))
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for parameter in self.cdist_type.optional_multiple_parameters:
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argument = "--" + parameter
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parser.add_argument(argument, dest=parameter, action='append', required=False,
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default=DefaultList.create(self.cdist_type.parameter_defaults.get(parameter, None)))
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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, 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.debug('Args: %s' % self.args)
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def setup_object(self):
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# Setup object_id - FIXME: unset / do not setup anymore!
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if not self.cdist_type.is_singleton:
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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(self.cdist_type, self.object_base_path, self.object_id)
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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:
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if self.cdist_object.parameters != self.parameters:
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raise cdist.Error("Object %s already exists with conflicting parameters:\n%s: %s\n%s: %s"
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% (self.cdist_object.name, " ".join(self.cdist_object.source), self.cdist_object.parameters, self.object_source, self.parameters)
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)
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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 / 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_requirements(self):
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"""record requirements"""
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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: continue
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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.NoSuchTypeError as e:
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self.log.error("%s requires object %s, but type %s does not exist (definded at %s)" % (self.cdist_object.name, requirement, e.name, self.object_source))
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raise
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self.log.debug("Recording requirement: " + requirement)
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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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def record_auto_requirements(self):
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"""An object shall automatically depend on all objects that it 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 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 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 not parent.name in current_object.requirements:
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parent.autorequire.append(current_object.name)
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