# The home-server project produces a multi-purpose setup using Ansible.
# Copyright © 2018–2023 Y. Gablin, under the GPL-3.0-or-later license.
# Full licensing information in the LICENSE file, or gnu.org/licences/gpl-3.0.txt if the file is missing.

# REQUIRED: make, root-less podman, jq, ssh-keygen

SHELL := /usr/bin/env bash

# https://stackoverflow.com/a/23324703
ROOT_DIR := $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
MY_IP := $(shell ip route | sed -nr 's/^default.* src ([^ ]+).*/\1/p')

NETWORK := 10.0.2.0
NET_BITS := 25# max 25 (no space between value and comment!)
FRONT_NAME := front-dev
FRONT_IP := 10.0.2.4
FRONT_SH_EXTRA := # empty, or must end with ;
FRONT_PODMAN_EXTRA :=
BACK_NAME := back-dev
BACK_IP := 10.0.2.3
BACK_SH_EXTRA := mkdir -p "${ROOT_DIR}/target/back.media/share/{p2p,video,my_CDs,my_MP3,photos}"; # empty, or must end with ;
BACK_PODMAN_EXTRA := -v "${ROOT_DIR}/target/back.media":/mnt/share

PODMAN_BUILD := podman build

PODMAN_RUN := podman run -d --privileged --cap-add=CAP_SYS_CHROOT --hostuser=${USER} --group-add=keep-groups -v "${ROOT_DIR}/target/shared_sockets:/run/shared_sockets:shared,U"

all:
	printf "— front-dev | back-dev (implies front-dev): that container\n— rm: remove containers\n— rmi: remove images\n— clean: remove all (incl. Archlinux image)\n— ansible: install dev site\n"

rm:
	podman stop back-dev; podman stop front-dev; podman rm back-dev; podman rm front-dev; rm -rf "${ROOT_DIR}/target"; true

rmi: rm
	podman rmi back-img; podman rmi front-img; true

clean: rmi
	podman rmi archlinux; true

ansible: back-dev
	cd "${ROOT_DIR}/../.." && ansible-playbook -i env/dev -v site.yaml

front-img: Makefile front.Dockerfile id-dev.pub id-chroot.pub
	ds=$$(find $^ -maxdepth 0 -printf %T@ | sort -t. -rn | awk -F. 'NR==1{print $$1}'); \
	dt=$$(podman images --format=json | jq --arg name localhost/front-img:latest -r '.[] | select(.Names | length > 0) | select(.Names[0] == $$name) | .Created'); \
	if [ -n "$$dt" ] && [ $$ds -gt $$dt ]; then \
		podman stop front-dev; podman rm front-dev; podman rmi front-img; \
		dt=; \
	fi; \
	if [ -z "$$dt" ]; then \
		${PODMAN_BUILD} -t=front-img -f=front.Dockerfile "${ROOT_DIR}"; \
	fi

front-dev: front-img
	mkdir -p "${ROOT_DIR}/target"/front.{opt,srv}; \
	${FRONT_SH_EXTRA} \
	if ! podman ps | grep -qF localhost/front-img:latest; then \
		rm -rf "${ROOT_DIR}/target/shared_sockets"; mkdir -m 1777 "${ROOT_DIR}/target/shared_sockets" 2>/dev/null; \
		if podman ps -a | grep -qF localhost/front-img:latest; then \
			podman start front-dev; \
		else \
			${PODMAN_RUN} --name front-dev -p 20022:22 \
				--network=slirp4netns:allow_host_loopback=true,cidr=${NETWORK}/${NET_BITS},outbound_addr=${MY_IP},port_handler=slirp4netns --hostname=${FRONT_NAME} --add-host=${BACK_NAME}:${BACK_IP} \
				-v "${ROOT_DIR}/target/front.opt:/opt" \
				-v "${ROOT_DIR}/target/front.srv:/srv" \
				${FRONT_PODMAN_EXTRA} localhost/front-img; \
		fi; \
	fi

back-img: Makefile back.Dockerfile id-dev.pub id-chroot
	ds=$$(find $^ -maxdepth 0 -printf %T@ | sort -t. -rn | awk -F. 'NR==1{print $$1}'); \
	dt=$$(podman images --format=json | jq --arg name localhost/back-img:latest -r '.[] | select(.Names | length > 0) | select(.Names[0] == $$name) | .Created'); \
	if [ -n "$$dt" ] && [ $$ds -gt $$dt ]; then \
		podman stop back-dev; podman rm back-dev; podman rmi back-img; \
		dt=; \
	fi; \
	if [ -z "$$dt" ]; then \
		${PODMAN_BUILD} -t=back-img -f=back.Dockerfile "${ROOT_DIR}"; \
	fi

back-dev: front-dev back-img
	mkdir -p "${ROOT_DIR}/target"/back.{opt,srv}; \
	${BACK_SH_EXTRA} \
	if ! podman ps | grep -qF localhost/back-img:latest; then \
		if podman ps -a | grep -qF localhost/back-img:latest; then \
			podman unshare podman mount front-dev; \
			podman start back-dev; \
		else \
		  set -x; \
			frontDir="$$(podman unshare podman mount front-dev)"; \
			#--cgroupns=container:front-dev \
			${PODMAN_RUN} --name back-dev -p 10022:22 \
				--network=slirp4netns:allow_host_loopback=true,cidr=${NETWORK}/${NET_BITS},outbound_addr=${MY_IP},port_handler=slirp4netns --hostname=${BACK_NAME} --add-host=${FRONT_NAME}:${FRONT_IP} \
				--mount=type=bind,src="$${frontDir}",dst="/var/lib/machines/${FRONT_NAME}",bind-propagation=shared,relabel=shared \
				-v "${ROOT_DIR}/target/back.opt:/opt" \
				-v "${ROOT_DIR}/target/back.srv:/srv" \
				${BACK_PODMAN_EXTRA} localhost/back-img; \
		fi; \
	fi

id-chroot:
	ssh-keygen -t ed25519 -f "${ROOT_DIR}/id-chroot" -N ""
id-chroot.pub:
	ssh-keygen -t ed25519 -f "${ROOT_DIR}/id-chroot" -N ""

.PHONY: all rm rmi clean ansible front-img front-dev back-img back-dev