Serhat Teker

Posted on May 16, 2021 Originally published at tech.serhatteker.com on Mar 4, 2021

Get Environment Variables From a File into Makefile

#make #linux #unix

It is very easy to achive that in make:

# Makefile

include .$(PWD)/.env

That's all. You can now access your env vars in make targets:

# Makefile

include .$(PWD)/.env

dummy-target:
    @echo $(SOME_ENV_VAR)

Sub-make

If want to you pass all your environment variables into Sub-make you should export them:

# Makefile

ENV := $(PWD)/.env

# Environment variables for project
include $(ENV)

# Export all variable to sub-make
export

Multiple Files

You can use multiple env files and their names can be anything:

# Variables
# -------------------------------------------------------------------------------------
VENV        := $(PWD)/.venv
ENV         := $(PWD)/.env
ENVS        := $(PWD)/.envs

# Environment variables for project
include $(ENV)
# Local environment variables for db
include $(ENVS)/.postgres
include $(ENVS)/.redis

# Export all variable to sub-make
export

All done.

Top comments (1)

smac89 • Feb 23 '22

Downside to this is that .env syntax is not a subset of the Makefile syntax because there are certain symbols allowed in .env, which make requires to be escaped. For example the symbols: # and $.

Also the fact that make treats tab as special means that it will attempt to interpret tabs as meaningful inside .env files