| # Copyright 2021 Google LLC | |
| # | |
| # 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. | |
| """Module for dealing with env vars.""" | |
| import ast | |
| import os | |
| def _eval_value(value_string): | |
| """Returns evaluated value.""" | |
| try: | |
| return ast.literal_eval(value_string) | |
| except: # pylint: disable=bare-except | |
| # String fallback. | |
| return value_string | |
| def get(env_var, default_value=None): | |
| """Returns an environment variable value.""" | |
| value_string = os.getenv(env_var) | |
| if value_string is None: | |
| return default_value | |
| return _eval_value(value_string) | |
| def get_bool(env_var, default_value=None): | |
| """Returns a boolean environment variable value. This is needed because a lot | |
| of CIFuzz users specified 'false' for dry-run. So we need to special case | |
| this.""" | |
| value = get(env_var, default_value) | |
| if not isinstance(value, str): | |
| return bool(value) | |
| lower_value = value.lower() | |
| allowed_values = {'true', 'false'} | |
| if lower_value not in allowed_values: | |
| raise Exception(f'Bool env var {env_var} value {value} is invalid. ' | |
| f'Must be one of {allowed_values}.') | |
| return lower_value == 'true' | |