### -*-makefile-*-

all:
clean::
.PHONY: all clean
.SECONDEXPANSION: #sorry

confdir = /etc/schroot/chroot.d

DISTS = stretch buster sid

MYARCH = $(shell dpkg --print-architecture)
OTHERARCHS = $(shell dpkg --print-foreign-architectures)
TOOLSARCH = $(MYARCH)
NATIVE_ARCHS = $(MYARCH) $(OTHERARCHS)
FOREIGN_ARCHS =
ARCHS = $(NATIVE_ARCHS) $(FOREIGN_ARCHS)

cross = $(foreach i,$1, $(foreach j,$2, $i-$j))
NATIVE_CHROOTS = $(call cross,$(DISTS),$(NATIVE_ARCHS))
FOREIGN_CHROOTS = $(call cross,$(DISTS),$(FOREIGN_ARCHS))
CHROOTS = $(NATIVE_CHROOTS) $(FOREIGN_CHROOTS)

chroot-dist = $(patsubst %/,%,$(dir $(subst -,/,$1)))
chroot-arch = $(notdir $(subst -,/,$1))

native-chroot-p = $(findstring $(call chroot-arch,$1), $(NATIVE_ARCHS))

qemuarch/armel = i386
qemuarch/armhf = i386
qemuarch/arm64 = amd64
chroot-toolsarch = $(TOOLSARCH)
chroot-qemuarch = $(qemuarch/$(call chroot-arch,$1))
chroot-deps = $(if $(call native-chroot-p,$2),,$(addprefix $1/$(call chroot-dist,$2)-,\
	$(sort $(call chroot-toolsarch,$2) $(call chroot-qemuarch,$2))))

VG = vg-$(shell hostname)
mkbuildchroot_OPTS = -a$(TOOLSARCH) -f -v$(VG)
mkchrootconf_OPTS = -v$(VG)
install-cross-tools_OPTS =
update-cross-tools_OPTS =

-include local.mk

all: config
CONFIG = $(confdir)/sbuild
config:; locking -w Makefile make $(CONFIG)
$(CONFIG): Makefile $(wildcard local.mk) mkchrootconf
	./mkchrootconf $(mkchrootconf_OPTS) $(CHROOTS) >$@.new && \
		mv $@.new $@
clean::; rm -f $(CONFIG)
.PHONY: config

UPDATE_CROSS = $(addprefix update-cross/, $(NATIVE_CHROOTS))
update-cross: $(UPDATE_CROSS)
$(UPDATE_CROSS): update-cross/%: update/%
	./update-cross-tools $(update-cross-tools_OPTS) \
		-a$(call chroot-arch,$*) $(call chroot-dist,$*)
.PHONY: update-cross $(UPDATE_CROSS)

UPDATE = $(addprefix update/, $(CHROOTS))
update: $(UPDATE)
$(UPDATE): update/%: chroot-stamps/% $$(call chroot-deps,update-cross,$$*)
	$(if $(call native-chroot-p,$*),,\
		./install-cross-tools $(install-cross-tools_OPTS) \
			-a$(call chroot-toolsarch,$*) \
			-q$(call chroot-qemuarch,$*) \
			$*)
	schroot -uroot -csource:$* -- apt-get update
	schroot -uroot -csource:$* -- apt-get -y dist-upgrade
	schroot -uroot -csource:$* -- apt-get -y autoremove
	schroot -uroot -csource:$* -- apt-get -y clean
.PHONY: update $(UPDATE)

all: create
CREATESTAMPS = $(addprefix chroot-stamps/, $(CHROOTS))
create: $(CREATESTAMPS)
$(CREATESTAMPS): chroot-stamps/%: $$(call chroot-deps,chroot-stamps,$$*)
	make config
	mkdir -p $(dir $@)
	./mkbuildchroot $(mkbuildchroot_OPTS) \
		$(if $(call native-chroot-p,$*),,\
			-Q -a$(call chroot-toolsarch,$*) \
			-q$(call chroot-qemuarch,$*)) \
		$*
	echo done >$@
clean::; rm -f chroot-stamps/*
.PHONY: create

all: prune
PRUNESTAMPS = $(patsubst chroot-stamps/%,prune/%, \
	$(filter-out $(CREATESTAMPS),$(wildcard chroot-stamps/*)))
prune: $(PRUNESTAMPS)
$(PRUNESTAMPS): prune/%:
	lvremove -f $(VG)/$*
	rm -f chroot-stamps/$*
.PHONY: prune $(PRUNESTAMPS)