template for context (REDO)
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
This commit is contained in:
Nico Schottelius
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1 changed files with 328 additions and 0 deletions
328
lib/cdist/context.py
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328
lib/cdist/context.py
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# 2010-2011 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 logging
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import os
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import stat
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import shutil
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import sys
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import tempfile
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import time
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import cdist.core
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import cdist.exec
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log = logging.getLogger(__name__)
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CODE_HEADER = "#!/bin/sh -e\n"
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class ConfigInstall:
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"""Cdist main class to hold arbitrary data"""
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def __init__(self,
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target_host,
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initial_manifest=False,
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base_path=False,
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exec_path=sys.argv[0],
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debug=False):
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self.target_host = target_host
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self.debug = debug
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# Only required for testing
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self.exec_path = exec_path
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self.exec_wrapper = cdist.exec.Wrapper(
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targe_host = self.target_host,
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remote_exec=os.environ['__remote_exec'].split(),
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remote_copy=os.environ['__remote_copy'].split()
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)
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# Configure logging - FIXME: make available for others
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log.addFilter(self)
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# Base and Temp Base
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self.base_path = (base_path or
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self.base_path = os.path.abspath(os.path.join(
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os.path.dirname(__file__), os.pardir, os.pardir))
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# Local input
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self.cache_path = os.path.join(self.base_path, "cache",
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self.target_host)
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self.conf_path = os.path.join(self.base_path, "conf")
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self.global_explorer_path = os.path.join(self.conf_path, "explorer")
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self.manifest_path = os.path.join(self.conf_path, "manifest")
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self.type_base_path = os.path.join(self.conf_path, "type")
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self.lib_path = os.path.join(self.base_path, "lib")
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self.initial_manifest = (initial_manifest or
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os.path.join(self.manifest_path, "init"))
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# Local output
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if '__cdist_out_dir' in os.environ:
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self.out_path = os.environ['__cdist_out_dir']
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else:
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self.out_path = os.path.join(tempfile.mkdtemp(), "out")
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self.bin_path = os.path.join(self.out_path, "bin")
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self.global_explorer_out_path = os.path.join(self.out_path, "explorer")
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self.object_base_path = os.path.join(self.out_path, "object")
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# Remote directory base
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if '__cdist_remote_out_dir' in os.environ:
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self.remote_base_path = os.environ['__cdist_remote_out_dir']
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else:
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self.remote_base_path = "/var/lib/cdist"
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self.remote_conf_path = os.path.join(self.remote_base_path, "conf")
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self.remote_object_path = os.path.join(self.remote_base_path, "object")
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self.remote_type_path = os.path.join(self.remote_conf_path, "type")
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self.remote_global_explorer_path = os.path.join(self.remote_conf_path, "explorer")
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# Setup env to be used by others
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self.__init_env()
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# Create directories
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self.__init_local_paths()
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self.__init_remote_paths()
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def __init_remote_paths(self):
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"""Initialise remote directory structure"""
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self.remove_remote_path(self.remote_base_path)
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self.remote_mkdir(self.remote_base_path)
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self.remote_mkdir(self.remote_conf_path)
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def __init_local_paths(self):
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"""Initialise local directory structure"""
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# Create base dir, if user supplied and not existing
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if not os.path.isdir(self.base_path):
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os.mkdir(self.base_path)
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# FIXME: raise more beautiful exception / Steven: handle exception
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os.mkdir(self.out_path)
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os.mkdir(self.global_explorer_out_path)
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os.mkdir(self.bin_path)
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def __init_env(self):
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"""Environment usable for other stuff"""
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os.environ['__target_host'] = self.target_host
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if self.debug:
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os.environ['__debug'] = "yes"
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def cleanup(self):
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# Do not use in __del__:
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# http://docs.python.org/reference/datamodel.html#customization
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# "other globals referenced by the __del__() method may already have been deleted
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# or in the process of being torn down (e.g. the import machinery shutting down)"
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#
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log.debug("Saving " + self.out_path + " to " + self.cache_path)
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# FIXME: raise more beautiful exception / Steven: handle exception
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# Remove previous cache
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if os.path.exists(self.cache_path):
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shutil.rmtree(self.cache_path)
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shutil.move(self.out_path, self.cache_path)
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def filter(self, record):
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"""Add hostname to logs via logging Filter"""
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record.msg = self.target_host + ": " + record.msg
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return True
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def run_initial_manifest(self):
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"""Run the initial manifest"""
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log.info("Running initial manifest %s", self.initial_manifest)
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env = { "__manifest" : self.manifest_path }
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self.run_manifest(self.initial_manifest, extra_env=env)
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def run_type_manifest(self, cdist_object):
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"""Run manifest for a specific object"""
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cdist_type = cdist_object.type
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manifest_path = os.path.join(self.type_base_path,
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cdist_type.manifest_path)
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log.debug("%s: Running %s", cdist_object.name, manifest_path)
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if os.path.exists(manifest_path):
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env = { "__object" : os.path.join(self.object_base_path,
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cdist_object.path),
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"__object_id": cdist_object.object_id,
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"__object_fq": cdist_object.name,
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"__type": os.path.join(self.type_base_path,
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cdist_type.path)
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}
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self.run_manifest(manifest_path, extra_env=env)
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def run_manifest(self, manifest_path, extra_env=None):
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"""Run a manifest"""
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log.debug("Running manifest %s, env=%s", manifest_path, extra_env)
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env = os.environ.copy()
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env['PATH'] = self.bin_path + ":" + env['PATH']
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# Information required in every manifest
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env['__target_host'] = self.target_host
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env['__global'] = self.out_path
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# Required for recording source in emulator
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env['__cdist_manifest'] = manifest_path
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# Required to find types in emulator
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env['__cdist_type_base_path'] = self.type_base_path
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# Other environment stuff
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if extra_env:
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env.update(extra_env)
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cdist.exec.shell_run_or_debug_fail(manifest_path, [manifest_path], env=env)
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def object_prepare(self, cdist_object):
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"""Prepare object: Run type explorer + manifest"""
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log.debug("Preparing object: " + cdist_object.name)
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self.run_type_explorer(cdist_object)
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self.run_type_manifest(cdist_object)
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cdist_object.prepared = True
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def object_run(self, cdist_object):
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"""Run gencode and code for an object"""
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log.debug("Running object %s", cdist_object)
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# Catch requirements, which re-call us
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if cdist_object.ran:
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return
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cdist_type = cdist_object.type
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for requirement in cdist_object.requirements:
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log.debug("Object %s requires %s", cdist_object, requirement)
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self.object_run(requirement)
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#
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# Setup env Variable:
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#
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env = os.environ.copy()
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env['__target_host'] = self.target_host
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env['__global'] = self.out_path
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env["__object"] = os.path.join(self.object_base_path, cdist_object.path)
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env["__object_id"] = cdist_object.object_id
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env["__object_fq"] = cdist_object.name
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env["__type"] = cdist_type.name
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# gencode
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for cmd in ["local", "remote"]:
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bin = os.path.join(self.type_base_path,
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getattr(cdist_type, "gencode_" + cmd + "_path"))
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if os.path.isfile(bin):
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outfile = os.path.join(self.object_base_path,
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getattr(cdist_object, "code_" + cmd + "_path"))
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outfile_fd = open(outfile, "w")
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# Need to flush to ensure our write is done before stdout write
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# FIXME: code header still needed?
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outfile_fd.write(CODE_HEADER)
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outfile_fd.flush()
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cdist.exec.shell_run_or_debug_fail(bin, [bin], env=env, stdout=outfile_fd)
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outfile_fd.close()
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status = os.stat(outfile)
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# Remove output if empty, else make it executable
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if status.st_size == len(CODE_HEADER):
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os.unlink(outfile)
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else:
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# Add header and make executable - identically to 0o700
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os.chmod(outfile, stat.S_IXUSR | stat.S_IRUSR | stat.S_IWUSR)
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cdist_object.changed=True
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# code local
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code_local = cdist_object.code_local_path
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if os.path.isfile(code_local):
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cdist.exec.run_or_fail([code_local])
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# code remote
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local_remote_code = os.path.join(self.object_base_path,
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cdist_object.code_remote_path)
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remote_remote_code = os.path.join(self.remote_object_path,
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cdist_object.code_remote_path)
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if os.path.isfile(local_remote_code):
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self.transfer_path(local_remote_code, remote_remote_code)
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cdist.exec.run_or_fail([remote_remote_code], remote_prefix=True)
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cdist_object.ran = True
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def link_emulator(self):
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"""Link emulator to types"""
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src = os.path.abspath(self.exec_path)
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for cdist_type in cdist.core.Type.list_types(self.type_base_path):
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dst = os.path.join(self.bin_path, cdist_type.name)
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log.debug("Linking emulator: %s to %s", src, dst)
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# FIXME: handle exception / make it more beautiful / Steven: raise except :-)
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os.symlink(src, dst)
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def deploy_to(self):
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"""Mimic the old deploy to: Deploy to one host"""
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log.info("Deploying to " + self.target_host)
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self.stage_prepare()
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self.stage_run()
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def deploy_and_cleanup(self):
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"""Do what is most often done: deploy & cleanup"""
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start_time = time.time()
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self.deploy_to()
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self.cleanup()
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log.info("Finished run of %s in %s seconds",
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self.target_host, time.time() - start_time)
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def stage_prepare(self):
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"""Do everything for a deploy, minus the actual code stage"""
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self.link_emulator()
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self.run_global_explorers()
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self.run_initial_manifest()
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log.info("Running object manifests and type explorers")
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# Continue process until no new objects are created anymore
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new_objects_created = True
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while new_objects_created:
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new_objects_created = False
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for cdist_object in cdist.core.Object.list_objects(self.object_base_path,
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self.type_base_path):
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if cdist_object.prepared:
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log.debug("Skipping rerun of object %s", cdist_object)
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continue
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else:
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self.object_prepare(cdist_object)
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new_objects_created = True
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def stage_run(self):
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"""The final (and real) step of deployment"""
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log.info("Generating and executing code")
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for cdist_object in cdist.core.Object.list_objects(self.object_base_path,
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self.type_base_path):
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log.debug("Run object: %s", cdist_object)
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self.object_run(cdist_object)
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