added support for cpio and xz

Actually this is the proper rewrite that was looming ever since
tgz support was introduced: there are multiple archive formats
supported by mkimage, and there are multiple compression methods
available as well.

So the bullet got bitten yet again along with the "goal parser"
which should be more straightforward by now.

Thanks dkr@ and mithraen@ for the inspiration of this evening.

Makefile

@@ -16,17 +16,15 @@ help:
 MKIMAGE_PROFILES = $(dir $(lastword $(MAKEFILE_LIST)))
 
 # only process the first target (inter-target cleanup is tricky)
-IMAGE_TARGET := $(firstword $(MAKECMDGOALS))#	distro/server-base.iso
+IMAGE_TARGET := $(firstword $(MAKECMDGOALS))#	ve/generic.tar.gz
 ifeq (./,$(dir $(IMAGE_TARGET)))#		convenience fallback
 IMAGE_TARGET := distro/$(IMAGE_TARGET)#		for omitted "distro/"
 endif
-IMAGE_CONF   := $(basename $(IMAGE_TARGET))#	distro/server-base
-IMAGE_CLASS  := $(dir $(IMAGE_TARGET))#		distro/ (let's fix it)
-IMAGE_CLASS  := $(IMAGE_CLASS:%/=%)#		distro
-IMAGE_FILE   := $(notdir $(IMAGE_TARGET))#	server-base.iso
-IMAGE_NAME   := $(basename $(IMAGE_FILE))#	server-base
-IMAGE_TYPE   := $(suffix $(IMAGE_FILE))#	.iso (fix this too)
-IMAGE_TYPE   := $(IMAGE_TYPE:.%=%)#		iso
+IMAGE_CONF    := $(firstword $(subst ., ,$(IMAGE_TARGET)))# ve/generic
+IMAGE_CLASS   := $(firstword $(subst /, ,$(IMAGE_TARGET)))# ve
+IMAGE_FILE    := $(lastword  $(subst /, ,$(IMAGE_TARGET)))# generic.tar.gz
+IMAGE_NAME    := $(firstword $(subst ., ,$(IMAGE_FILE)))#   generic
+IMAGE_TYPE    := $(subst $(IMAGE_NAME).,,$(IMAGE_FILE))#    tar.gz
 
 # preferences
 -include $(HOME)/.mkimage/profiles.mk

features.in/build-ve/lib/build-ve.mk

@@ -1,6 +1,12 @@
 # step 4: build the virtual environment image
 
+ifeq (tar,$(IMAGE_PACKTYPE))
 MKI_TAR_COMPRESS = $(IMAGE_COMPRESS)
+endif
+
+ifeq (cpio,$(IMAGE_PACKTYPE))
+MKI_CPIO_COMPRESS = $(IMAGE_COMPRESS)
+endif
 
 IMAGE_PACKAGES = $(call list,$(BASE_LISTS)) \
 		 $(SYSTEM_PACKAGES) \

features.in/pack/README

@@ -1,3 +1,4 @@
 Эта фича определяет формат упаковки создаваемого образа.
 На данный момент поддерживаются iso (загрузочный ISO9660
-для дистрибутивов) и tar/tgz (виртуальные окружения).
+для дистрибутивов) и tar/cpio с возможностью сжатия gz/xz
+(виртуальные окружения).

features.in/pack/config.mk

@@ -1,5 +1,4 @@
 DISTRO_EXTS := .iso
-VE_EXTS     := .tar .tgz
 
 use/pack:
 	@$(call add_feature)
@@ -11,8 +10,25 @@ else
 	@$(call set,IMAGE_PACKTYPE,isodata)
 endif
 
-use/pack/tar: use/pack
-	@$(call set,IMAGE_PACKTYPE,tar)
+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 ...
 
-use/pack/tgz: use/pack/tar
-	@$(call set,IMAGE_COMPRESS,gzip)
+# generate rules for archive/compressor combinations
+define PACK_containers
+use/pack/$(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)))))