Makefile

.PHONY: check
BASH_EXISTS := $(shell which bash)
SHELL := $(shell which bash)
YODA_DIR := $(shell pwd)
INSTALL_TO = /usr/local/bin
IF_VER_GT = $(shell echo -e "$2\n$1" | sort -ct. -k1,1n -k2,2n && echo "OK" || exit 1)
BASH_VERSION := $(shell echo $${BASH_VERSION%%.*})
DOCKER_API_VERSION := $(shell docker version -f '{{.Server.APIVersion}}' | cut -d. -f-2)
DOCKER_COMPOSE_VERSION := $(shell docker compose version | cut -d' ' -f4 | cut -dv -f2 | cut -d. -f-2)
GIT_VERSION := $(shell git version | cut -d' ' -f3)

check:
	which docker
	which bash
	which sed
	which grep
	which tput
	test -n 'bash >= 4' -a -n "$(call IF_VER_GT, $(BASH_VERSION), 4)"
	test -n 'Docker API version >= 1.41' -a -n "$(call IF_VER_GT, $(DOCKER_API_VERSION), 1.41)"
	test -n 'Docker compose plugin >= 1.28' -a -n "$(call IF_VER_GT, $(DOCKER_COMPOSE_VERSION), 1.18)"
	test -n 'git >= 2.22' -a -n "$(call IF_VER_GT, $(GIT_VERSION), 2.22)"

install:
	@echo "Installing Yoda to "$(INSTALL_TO)
	ln -fs $(YODA_DIR)/yoda $(INSTALL_TO)/yoda