initial isomd5sum feature

This is a base for "media check" to become available:
using this feature will implant a checksum into the image
so that it can be verified during install.

Also added a test/demo distro/live-isomd5sum target.
For real distros an alterator module is probably due.

conf.d/live.mk

@@ -5,6 +5,9 @@ distro/live: distro/.base use/live/base use/power/acpi/cpufreq
 distro/rescue: distro/.base use/rescue use/syslinux/ui-menu
 distro/dos: distro/.init use/dos use/syslinux/ui-menu
 
+distro/live-isomd5sum: distro/.base use/live/base use/isomd5sum
+	@$(call add,LIVE_PACKAGES,livecd-isomd5sum)
+
 distro/live-builder: distro/.base sub/main \
 	use/live/base use/dev/mkimage use/power/acpi/button
 	@$(call add,LIVE_LISTS,$(call tags,base && (server || builder)))

features.in/isomd5sum/README

@@ -0,0 +1,3 @@
+Эта фича конфигурирует внедрение контрольной суммы в образ
+инсталятора после его сборки с целью проверки целостности
+на ранней стадии установки.

features.in/isomd5sum/config.mk

@@ -0,0 +1,3 @@
+use/isomd5sum:
+	@$(call add,FEATURES,isomd5sum)
+	@$(call add,POSTPROCESS_TARGETS,isomd5sum)

features.in/isomd5sum/lib/build-isomd5sum.mk

@@ -0,0 +1,4 @@
+CHROOT_PACKAGES += isomd5sum
+
+postprocess-isomd5sum:
+	@implantisomd5 "$(IMAGEDIR)/$(IMAGE_OUTFILE)"

image.in/Makefile

@@ -47,7 +47,7 @@ pack-image: imagedir
 imagedir:
 	@mkdir -p "$(IMAGEDIR)"
 
-postprocess:
+postprocess: $(addprefix postprocess-,$(POSTPROCESS_TARGETS))
 	@OUTPATH="$(IMAGEDIR)/$(IMAGE_OUTFILE)"; \
 	echo "** image: $$OUTPATH" >&2 && \
 	ln -sf "$(IMAGE_OUTFILE)" "$(IMAGEDIR)/$(IMAGE_LINK)" && \