tseho / dotenv-rules

dotenv rules demo

I want to be sure that defined variables are loaded in the right order.
In short, real environment variables > .env > Makefile > docker-compose.yml.

When running the script execute.sh, all the combinations are executed and each value is printed in the console.

Examples

For the examples, the variable ORIGIN is used with the following values, when set:

• cmd when exported in bash
• dotenv in .env
• make in Makefile
• docker in docker-compose.yml

---

docker-compose up --no-log-prefix 2>/dev/null | grep "ORIGIN" | sed -E "s/^.*=//g"

Without a .env, it will return docker since the Makefile is bypassed.
With a .env, it will return dotenv because .env have precedence over default values.

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make docker

Without a .env, it will return make because it's the makefile default value.
With a .env, it will return dotenv because .env have precedence over default values.

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ORIGIN=cmd make docker

Always cmd, with or without a .env, because the real environment must have precedence over other values.