fsmgr := $(shell command -v fsmgr)

ifeq ($(fsmgr),)
$(error "no fsmgr")
endif

sudo := $(shell [ "$$(id -u)" = 0 ] || echo sudo)

rootfs ?= samizdat.seed.btrfs
patchfs ?= samizdat.patch.btrfs

.DEFAULT_GOAL = all

.PHONY: all rootfs patchfs clean
all: $(rootfs) $(patchfs)

_build _filesystem:
	$(sudo) btrfs subvolume create $@

clean = $(patchfs) $(rootfs) $(rootfs:%.seed.btrfs=%.btrfs)
clean := $(clean) $(clean:%=%.tmp)

clean:
	rm -f $(clean)

rootfs: $(rootfs)
patchfs: $(patchfs)

%.patch.btrfs: %.seed.btrfs
	$(sudo) $(fsmgr) build $@

%.seed.btrfs: %.btrfs
	$(sudo) $(fsmgr) build $@

%.btrfs:
	$(sudo) $(fsmgr) build $@

$(patchfs): $(rootfs)

$(patchfs) $(rootfs):
	$(sudo) REWRITE_SOURCES_LIST=y $(fsmgr) build $@