This crate helps to read contents of a file with name taken from environment variable.
Some applications have sensitive data, like API keys, which is unsafe to keep in VCS. One possible solution is keeping secret data in files, taking their names from environment variables. Say, you have to use cloud provider API key to control your PaaS system and you need a key for external data API. You can then run your application like:
$ CLOUD_API_KEY=/etc/secrets/cloud_api.key DATA_API_KEY=/etc/secrets/data_api.key your_app
The same pattern simplifies testing (with test keys and not production ones). It is extendable too: you may have a default location for production use with ability to override it via environment variables.
Main error type for this crate
Read contents of a file which name is specified in