cdist/lib/cdist/emulator.py

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# -*- coding: utf-8 -*-
#
# 2011 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
import argparse
import logging
import os
import cdist
import cdist.path
log = logging.getLogger(__name__)
def run(argv):
"""Emulate type commands (i.e. __file and co)"""
type = os.path.basename(argv[0])
type_dir = os.path.join(os.environ['__cdist_type_base_dir'], type)
param_dir = os.path.join(type_dir, "parameter")
global_dir = os.environ['__global']
object_source = os.environ['__cdist_manifest']
if '__debug' in os.environ:
logging.root.setLevel(logging.DEBUG)
else:
logging.basicConfig(level=logging.INFO)
parser = argparse.ArgumentParser(add_help=False)
for parameter in cdist.path.file_to_list(os.path.join(param_dir, "optional")):
argument = "--" + parameter
parser.add_argument(argument, action='store', required=False)
for parameter in cdist.path.file_to_list(os.path.join(param_dir, "required")):
argument = "--" + parameter
parser.add_argument(argument, action='store', required=True)
# If not singleton support one positional parameter
if not os.path.isfile(os.path.join(type_dir, "singleton")):
parser.add_argument("object_id", nargs=1)
# And finally verify parameter
args = parser.parse_args(argv[1:])
# Setup object_id
if os.path.isfile(os.path.join(type_dir, "singleton")):
object_id = "singleton"
else:
object_id = args.object_id[0]
del args.object_id
# FIXME: / hardcoded - better portable solution available?
if object_id[0] == '/':
object_id = object_id[1:]
# Prefix output by object_self
logformat = '%(levelname)s: ' + type + '/' + object_id + ': %(message)s'
logging.basicConfig(format=logformat)
# FIXME: verify object id
log.debug(args)
object_dir = os.path.join(global_dir, "object", type,
object_id, cdist.path.DOT_CDIST)
param_out_dir = os.path.join(object_dir, "parameter")
object_source_file = os.path.join(object_dir, "source")
if os.path.exists(param_out_dir):
object_exists = True
old_object_source_fd = open(object_source_file, "r")
old_object_source = old_object_source_fd.readlines()
old_object_source_fd.close()
else:
object_exists = False
try:
os.makedirs(param_out_dir, exist_ok=True)
except OSError as error:
raise cdist.Error(param_out_dir + ": " + error.args[1])
# Record parameter
params = vars(args)
for param in params:
value = getattr(args, param)
if value:
file = os.path.join(param_out_dir, param)
log.debug(file + "<-" + param + " = " + value)
# Already exists, verify all parameter are the same
if object_exists:
if not os.path.isfile(file):
raise cdist.Error("New parameter \"" +
param + "\" specified, aborting\n" +
"Source = " +
" ".join(old_object_source)
+ " new =" + object_source)
else:
param_fd = open(file, "r")
value_old = param_fd.readlines()
param_fd.close()
if(value_old[0] != value):
raise cdist.Error("Parameter\"" + param +
"\" differs: " + " ".join(value_old) + " vs. " +
value +
"\nSource = " + " ".join(old_object_source)
+ " new = " + object_source)
else:
param_fd = open(file, "w")
param_fd.writelines(value)
param_fd.close()
# Record requirements
if "__require" in os.environ:
requirements = os.environ['__require']
log.debug(object_id + ":Writing requirements: " + requirements)
require_fd = open(os.path.join(object_dir, "require"), "a")
require_fd.writelines(requirements.split(" "))
require_fd.close()
# Record / Append source
source_fd = open(os.path.join(object_dir, "source"), "a")
source_fd.writelines(object_source)
source_fd.close()
log.debug("Finished " + type + "/" + object_id + repr(params))
def link(exec_path, bin_dir, type_list):
"""Link type names to cdist-type-emulator"""
source = os.path.abspath(exec_path)
for type in type_list:
destination = os.path.join(bin_dir, type)
log.debug("Linking %s to %s", source, destination)
os.symlink(source, destination)