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# 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

LOGDIR = "/tmp/$$(pwd | sed 's|/|!|g')!log"

all: | container-runner.touchfile log

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

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

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

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

log:
	ln -sf $(LOGDIR) $@

start-container: guix-container.sh container-runner.touchfile | log
	unshare --mount ./run-with-fake-mounts.sh $(LOGDIR) \
		./$< start -e ./container-runner -p ./pidfile -l $(LOGDIR)

stop-container: guix-container.sh
	./$< stop -e ./container-runner -p ./pidfile

restart-container: guix-container.sh container-runner.touchfile | log
	unshare --mount ./run-with-fake-mounts.sh $(LOGDIR) \
		./$< restart -e ./container-runner -p ./pidfile -l $(LOGDIR)

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                               \
	start-container stop-container restart-container \
	enter-container fake-client                      \
	install reinstall                                \
	sdists koszko-org-wesite-sdist