DISTRO_EXTS := .iso

use/pack:
	@$(call add_feature)

# conventional ISO9660 image hybridization
# for direct bootable usbflash imaging
use/pack/iso: use/pack boot/isolinux $(ISOHYBRID:%=use/isohybrid)
ifeq (distro,$(IMAGE_CLASS))
	@$(call set,IMAGE_PACKTYPE,isoboot)
else
	@$(call set,IMAGE_PACKTYPE,isodata)
endif

VE_ARCHIVES := tar cpio
VE_COMPRESSORS := gz xz# there's no sense in bzip2 by now
VE_ZIPS := $(call addsuffices, \
		$(addprefix .,$(VE_COMPRESSORS)), \
			$(VE_ARCHIVES))# tar.gz cpio.xz ...
VE_EXTS := $(sort $(addprefix .,$(VE_ARCHIVES) $(VE_ZIPS)))# .tar .tar.gz ...

# generate rules for archive/compressor combinations
define PACK_containers
use/pack/$(1): use/pack
	@$$(call set,IMAGE_PACKTYPE,$(1))
endef

define PACK_compressors
use/pack/$(1).$(2): use/pack/$(1)
	@$$(call set,IMAGE_COMPRESS,$(2))
endef

$(foreach c,$(VE_ARCHIVES), \
	$(eval $(call PACK_containers,$(c))) \
	$(foreach z,$(VE_COMPRESSORS), \
		$(eval $(call PACK_compressors,$(c),$(z)))))