dotenv-flow.rs

A fork of dotenv-rs that adds support for the popular dotenv-flow loading strategy.

The dotenv-flow strategy works as follows:

• if a DOTENV_ENV environment variable is set, load .env.{DOTENV_ENV}.local (e.g. .env.staging.local)
• load .env.local
• if a DOTENV_ENV environment variable is set, load .env.{DOTENV_ENV} (e.g. .env.staging)
• load .env

Each step will only load variables that are not already present in the environment, so for example variables in the .env.{DOTENV_ENV}.local file will have the highest priority, followed .env.local and so on.

Breaking in 0.16.0

• env.{DOTENV_ENV}.local is now loaded before .env.local

HowTo

Installation

cargo add dotenv-flow

Usage

To use this package, add the following line to your main function to load the environment variables from available .env.* files:

fn main() {
  dotenv_flow::dotenv_flow().ok();
}

Tests

To test this project, make sure you pass --test-threads=1 to cargo test, e.g.

cargo test -- --test-threads=1

This is necessary because cargo test runs tests in multiple threads by default, but environment variables are process-globals, therefore we need to limit concurrency to avoid race conditions.