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# 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'
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