Makefile to keep python virtualenv up to date

Makefile

# Usage:
# python3 -m venv pytools
# cp Makefile pytools/
# cd pytools
# make lock && make install
# ln -snf /path/to/pytools/bin/some_useful_cli_tool ~/bin/

# Runs all commands in a target in a single shell. Otherwise each line is run in a seperate shell
.ONESHELL:

# By default runs "sh" which does not have process substitution, i.e. <(blah bla bla ) syntax and `source` builtin
SHELL = /usr/bin/bash

.PHONY: upgrade install lock check

upgrade: check
        source ./bin/activate
        pip install --upgrade pip wheel setuptools
        pip list --not-required --format json | jq -r '.[] | .name' | xargs pip install --upgrade

# Some tools need wheel to be present. So installing in first before anything else
install:
        source ./bin/activate
        pip install --upgrade pip wheel setuptools
        cat packs.lock | xargs pip install --upgrade

lock:
        source ./bin/activate
        pip list --not-required --format json | jq -r '.[] | .name' > packs.lock

check:
        source ./bin/activate
        diff packs.lock <(pip list --not-required --format json | jq -r '.[] | .name') && echo "lock is update"