# Copyright (C) 2016-2018  Luke Shumaker
# SPDX-License-Identifier: AGPL-3.0-or-later

# GNU standard settings
prefix = /usr/local
exec_prefix = $(prefix)
bindir = $(exec_prefix)/bin
localstatedir = $(prefix)/var
runstatedir = $(or $(shell systemd-path system-runtime 2>/dev/null),$(localstatedir)/run)
sysconfdir = $(prefix)/etc

# systemd settings
rootprefix = $(prefix)
systemunitdir = $(or $(shell pkg-config --variable=systemdsystemunitdir systemd 2>/dev/null),$(rootprefix)/lib/systemd/system)

# other
pkgconfdir = $(sysconfdir)/conf.d/qemu.d
BINPROG = $(bindir)/qemu
SOCAT = /bin/socat

outdir = .
srcdir = .

####

files.out.all += qemu qemu@.service

files.sys.all += $(BINPROG)
files.sys.all += $(systemunitdir)/qemu@.service
files.sys.all += $(pkgconfdir)

var = $(patsubst ./%,%,$(outdir)/.var.)

all: $(addprefix $(outdir)/,$(files.out.all))
clean:
	rm -f -- $(addprefix $(outdir)/,$(files.out.all))
install: $(addprefix $(DESTDIR),$(files.sys.all))
.PHONY: all clean install
.SECONDARY:
.DELETE_ON_ERROR:

$(outdir)/qemu: $(var)runstatedir $(var)pkgconfdir
$(outdir)/qemu@.service: $(var)runstatedir $(var)BINPROG $(var)SOCAT
$(outdir)/%: $(srcdir)/%.in
	sed $(foreach v,$(patsubst $(var)%,%,$(filter $(var)%,$^)),-e 's|@$v@|$($v)|g') < $< > $@

$(DESTDIR)$(BINPROG): $(outdir)/qemu
	install -DTm755 $< $@
$(DESTDIR)$(systemunitdir)/%: $(outdir)/%
	install -DTm644 $< $@
$(DESTDIR)$(pkgconfdir):
	install -d $@

####

# Magic to depend on the value of variables

.PHONY: FORCE
$(var)%: FORCE
	@printf '%s' $(call quote.shell,$($*)) | sed 's/^/#/' | ./write-ifchanged $@
-include $(wildcard $(var)*)

define at.nl


endef

# I put this as the last line in the file because it confuses Emacs
# syntax highlighting and makes the remainder of the file difficult to
# edit.
quote.shell = $(subst $(at.nl),'$$'\n'','$(subst ','\'',$1)')