initial specific VM formats support

Raw disk images are convenient and universal
but there are custom formats like Qemu's qcow2
providing additional features, e.g. copy-on-write
or space savings.  All of this ultimately belongs
to mkimage but in the mean time has been implemented
here as well.

Makefile

@@ -26,7 +26,7 @@ endif
 # recursive make considered useful for m-p
 MAKE += -r --no-print-directory
 
-DIRECT_TARGETS := clean distclean check help help/distro help/ve
+DIRECT_TARGETS := clean distclean check help help/distro help/ve help/vm
 .PHONY: $(DIRECT_TARGETS)
 $(DIRECT_TARGETS):
 	@$(MAKE) -f main.mk $@

doc/vm.txt

@@ -13,6 +13,10 @@ mike ALL=NOPASSWD: /usr/share/mkimage-profiles/bin/tar2vm
 пользователю право выполнять с повышенными привилегиями доступный ему
 по записи скрипт равнозначно предоставлению полных привилегий root.
 
+Для работы с более специфичными форматами, чем raw ("буквальный"
+образ диска), потребуется утилита qemu-img из одноименного пакета;
+см. тж. вывод команды make help/vm
+
 Также потребуется пакет multipath-tools (/sbin/kpartx).
 
 Пример сборки и запуска VM:

features.in/build-vm/lib/90-build-vm.mk

@@ -9,6 +9,7 @@ IMAGE_PACKAGES = $(SYSTEM_PACKAGES) \
 
 # intermediate chroot archive
 VM_TARBALL := $(IMAGE_OUTDIR)/$(IMAGE_NAME).tar
+VM_RAWDISK := $(IMAGE_OUTDIR)/$(IMAGE_NAME).raw
 
 check-sudo:
 	@if ! type -t sudo >&/dev/null; then \
@@ -16,15 +17,29 @@ check-sudo:
 		exit 1; \
 	fi
 
-convert-image: check-sudo
+prepare-image: check-sudo
 	@if ! sudo $(TOPDIR)/bin/tar2vm \
-		"$(VM_TARBALL)" "$(IMAGE_OUTPATH)" $$VM_SIZE; then \
+		"$(VM_TARBALL)" "$(VM_RAWDISK)" $$VM_SIZE; then \
 		echo "** error: sudo tar2vm failed, see also doc/vm.txt" >&2; \
 		exit 1; \
 	fi
 
+convert-image: prepare-image
+	@case "$(IMAGE_TYPE)" in \
+	"img") VM_FORMAT="raw";; \
+	"vhd") VM_FORMAT="vpc";; \
+	*) VM_FORMAT="$(IMAGE_TYPE)"; \
+	esac; \
+	if ! type -t qemu-img >&/dev/null; then \
+		echo "** warning: qemu-img not available" >&2; \
+	else \
+		qemu-img convert -O "$$VM_FORMAT" \
+			"$(VM_RAWDISK)" "$(IMAGE_OUTPATH)"; \
+	fi
+
 run-image-scripts: GLOBAL_ROOTPW := $(ROOTPW)
 
+# override
 pack-image: MKI_PACK_RESULTS := tar:$(VM_TARBALL)
 
 all: $(GLOBAL_DEBUG) build-image copy-tree run-image-scripts pack-image \

features.in/pack/config.mk

@@ -1,3 +1,5 @@
+### this might really belong to build-*...
+
 # distributions
 DISTRO_EXTS := .iso
 
@@ -38,6 +40,6 @@ $(foreach c,$(VE_ARCHIVES), \
 		$(eval $(call PACK_compressors,$(c),$(z)))))
 
 # virtual machines
-VM_EXTS := .img
+VM_EXTS := .img .qcow2 .vdi .vmdk .vhd
 
-use/pack/img: use/pack; @:
+$(VM_EXTS:.%=use/pack/%): use/pack; @: