# SPDX-License-Identifier: CC0-1.0

# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
#
# Available under the terms of Creative Commons Zero v1.0 Universal.

GUIX := guix

# Almost all commands in this Makefilo are run through `guix time-machine` with
# Guix revision fixed to the one from the commit below. This ensures that the
# same working environment is always used.
GUIX_COMMIT := a86979b41a49a8fcdaa887970ba594dbba701226

GUIX_TM = $(GUIX) time-machine --commit=$(GUIX_COMMIT) --

GUIX_LOAD_PATHS = $$(                                 \
	find subrepos/ -mindepth 1 -maxdepth 1        \
	-exec printf ' -L %s/guix-module-dir/' {} ';' \
	)

GUIX_SYS_CONTAINER = $(GUIX_TM) system container $(GUIX_LOAD_PATHS)

GUIX_SHELL = $(GUIX_TM) shell

KOSZKO_ORG_WEBSITE_INFO = \
	subrepos/koszko-org-website/src/koszko_org_website.egg-info/PKG-INFO
HYDRILLA_WEBSITE_INFO = \
	subrepos/hydrilla-website/src/hydrilla_website.egg-info/PKG-INFO

TEST_ROOT_DIR = "/tmp/$$(pwd | sed 's|/|!|g')!!test-root"
TEST_WWW_DIR=$(TEST_ROOT_DIR)/var/www
TEST_ALL_LOGS_DIR = $(TEST_ROOT_DIR)/var/log
TEST_LOG_DIR = $(TEST_ALL_LOGS_DIR)/guix-container
TEST_ETC_DIR = $(TEST_ROOT_DIR)/etc/guix-container

all: | container-runner.touchfile log

$(KOSZKO_ORG_WEBSITE_INFO):
	$(MAKE) -C subrepos/koszko-org-website dist
$(HYDRILLA_WEBSITE_INFO):
	$(MAKE) -C subrepos/hydrilla-website dist

container-runner: | container.scm          \
		$(KOSZKO_ORG_WEBSITE_INFO) \
		$(HYDRILLA_WEBSITE_INFO)
	$(GUIX_SYS_CONTAINER) container.scm -r container-runner
	touch container-runner.touchfile

container-runner.touchfile: container.scm  \
		$(KOSZKO_ORG_WEBSITE_INFO) \
		$(HYDRILLA_WEBSITE_INFO)
	$(MAKE) clean-runner
	$(MAKE) container-runner

hosts: hosts-extra /etc/hosts
	cat $^ > $@

log:
	ln -sf $(TEST_LOG_DIR) $@

prepare-test-root:
	rm -rf $(TEST_ROOT_DIR)
	@# Prepare replacement `/var/www`
	mkdir -p $(TEST_WWW_DIR)/koszko.org/html
	printf ':D\n' > $(TEST_WWW_DIR)/koszko.org/html/index.html
	@# Prepare replacement `/var/log`
	mkdir -p $(TEST_ALL_LOGS_DIR)
	@# Prepare replacement `/etc`
	mkdir --mode=750 -p $(TEST_ETC_DIR)/hydrilla-website
	printf 'test non-secret\n' > $(TEST_ETC_DIR)/hydrilla-website/secret.txt
	chgrp -R 133 $(TEST_ETC_DIR)/hydrilla-website
	chmod 640 $(TEST_ETC_DIR)/hydrilla-website/secret.txt

GUIX_CONTAINER_FLAGS =                     \
	-e ./container-runner -p ./pidfile \
	-l $(TEST_LOG_DIR)                 \
	-w $(TEST_WWW_DIR)                 \
	-t $(TEST_ETC_DIR)

start-container: guix-container.sh container-runner.touchfile \
		prepare-test-root | log
	./$< start $(GUIX_CONTAINER_FLAGS)

stop-container: guix-container.sh
	./$< stop $(GUIX_CONTAINER_FLAGS)

restart-container: guix-container.sh container-runner.touchfile \
		prepare-test-root | log
	./$< restart $(GUIX_CONTAINER_FLAGS)

enter-container: pidfile
	nsenter -a -t "$$(cat pidfile)" \
		/run/current-system/profile/bin/bash --login

fake-client: fake-client-setup-mounts.sh hosts
	unshare --map-root-user --mount ./$< "$${SHELL:-/bin/sh}"

install: container.scm sdists
	cp guix-container.sh /etc/init.d/guix-container
	mkdir -p /usr/local/bin
	if [ -e /usr/local/bin/guix-container ]; then \
		rm /usr/local/bin/guix-container;     \
	fi
	$(GUIX_SYS_CONTAINER) container.scm -r /usr/local/bin/guix-container

reinstall:
	rm -rf /usr/local/bin/guix-container
	$(MAKE) install

clean-runner:
	rm -rf container-runner container-runner.touchfile

clean: clean-runner
	$(MAKE) -C subrepos/koszko-org-website clean
	rm -rf log hosts

.PHONY: all                                              \
	clean-runner clean                               \
	prepare-test-root                                \
	start-container stop-container restart-container \
	enter-container fake-client                      \
	install reinstall                                \
	sdists koszko-org-wesite-sdist