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195 lines
7.2 KiB
195 lines
7.2 KiB
# -*- coding: utf-8 -*-
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#
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# 2011 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 argparse
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import logging
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import os
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import cdist
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from cdist import core
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class IllegalRequirementError(cdist.Error):
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def __init__(self, requirement, message=None):
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self.requirement = requirement
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self.message = message or 'Illegal requirement'
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def __str__(self):
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return '%s: %s' % (self.message, self.requirement)
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class Emulator(object):
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def __init__(self, argv):
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self.argv = argv
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self.object_id = False
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self.global_path = os.environ['__global']
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self.object_source = os.environ['__cdist_manifest']
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self.target_host = os.environ['__target_host']
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self.type_base_path = os.environ['__cdist_type_base_path']
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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.Type(self.type_base_path, self.type_name)
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self.__init_log()
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def filter(self, record):
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"""Add hostname and object to logs via logging Filter"""
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prefix = self.target_host + ": (emulator)"
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if self.object_id:
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prefix = prefix + " " + self.type_name + "/" + self.object_id
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record.msg = prefix + ": " + record.msg
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return True
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def run(self):
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"""Emulate type commands (i.e. __file and co)"""
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if '__install' in os.environ:
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if not self.cdist_type.is_install:
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self.log.debug("Running in install mode, ignoring non install type")
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return True
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self.commandline()
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self.setup_object()
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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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logformat = '%(levelname)s: %(message)s'
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logging.basicConfig(format=logformat)
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if '__cdist_debug' in os.environ:
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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(__name__)
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self.log.addFilter(self)
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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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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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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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# 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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# FIXME: verify object id
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# Setup object_id
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if self.cdist_type.is_singleton:
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self.object_id = "singleton"
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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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# strip leading slash from object_id
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self.object_id = self.object_id.lstrip('/')
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# Instantiate the cdist object we are defining
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self.cdist_object = core.Object(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, " ".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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def record_requirements(self):
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"""record requirements"""
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if "require" in os.environ:
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requirements = os.environ['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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self.log.debug("Recording requirement: " + requirement)
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requirement_parts = requirement.split(os.sep, 1)
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requirement_type_name = requirement_parts[0]
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try:
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requirement_object_id = requirement_parts[1]
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except IndexError:
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# no object id, assume singleton
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requirement_object_id = 'singleton'
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# Remove leading / from object id
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requirement_object_id = requirement_object_id.lstrip('/')
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# Instantiate type which fails if type does not exist
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requirement_type = core.Type(self.type_base_path, requirement_type_name)
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if requirement_object_id == 'singleton' \
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and not requirement_type.is_singleton:
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raise IllegalRequirementError(requirement, "Missing object_id and type is not a singleton.")
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# Instantiate object which fails if the object_id is illegal
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requirement_object = core.Object(requirement_type, self.object_base_path, requirement_object_id)
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# Construct cleaned up requirement with only one / :-)
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requirement = requirement_type_name + '/' + requirement_object_id
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self.cdist_object.requirements.append(requirement)
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# Record / Append source
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self.cdist_object.source.append(self.object_source)
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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 currenlty executed
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__object_name = os.environ.get('__object_name', None)
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if __object_name:
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_object = self.cdist_object.object_from_name(__object_name)
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# prevent circular dependencies
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if not _object.name in self.cdist_object.requirements:
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_object.requirements.append(self.cdist_object.name)
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