Makefile for pinning python requirements

Makefile

# DOCUMENTATION NOTE: Regular comments don't print in 'help'; two #'s do.

## +------------------------------------------------------------------------------
## | This Makefile contains targets for various python build / deploy steps.
## |
## | Key Targets to know:

## |      make / make help: Display Help
help:
	@sed -ne '/@sed/!s/## //p' $(MAKEFILE_LIST)

pip_framework_setup:
	pip install --upgrade pip-tools pip setuptools

install_local: pip_framework_setup
	pip install --require-hashes --upgrade -r requirements/main.txt

## |      make install: Install frozen dependencies into local pip modules
install: install_local

update_all_deps: check_pat pip_framework_setup
	pip-compile --upgrade --allow-unsafe --generate-hashes --no-emit-index-url --output-file requirements/main.txt requirements/main.in

## |      make update: Update frozen requirements from input specs, and install
## |        into local pip modules (Only used if you have updated your input req
update: update_all_deps install

.PHONY: help pip_framework_setup install_local install update_all_deps update

This requires you to create a file called ./requirements/main.in which contains all your direct requirements.
Running make update will pin newest requirements according to your spec; make install will (re)-install existing spec requirements.