#!/usr/bin/python

# Copyright 2015 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import sys
import yaml

def mutate_env(path, var, value):
    # Load the existing arguments
    if os.path.exists(path):
        args = yaml.load(open(path))
    else:
        args = {}
    args[var] = value
    yaml.dump(args, stream=open(path, 'w'), default_flow_style=False)

if __name__ == "__main__":
    mutate_env(sys.argv[1], sys.argv[2], sys.argv[3])