initial kernel and metadata features

This further refines the modular build by making
metadata being a clearly separated feature rather
than having to rely on runtime tests, and also by
moving the code which cares for kernel bits of base
installation (.base list) in a feature of its own.

There's more to it but let's get the ball rolling first.

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

@@ -16,36 +16,14 @@ BOOT_ABST := $(META_ABSTRACT)
 
 BOOT_TYPE := isolinux
 
-# Metadata/ needed only for installers (and not for e.g. syslinux.iso)
-# FIXME: installable live needs it too, don't move to install2 feature
-### see also .../pkg.in/lists/Makefile
-ifneq (,$(findstring install2,$(FEATURES)))
-METADATA = metadata
-endif
-
 # see also ../scripts.d/01-isosort; needs mkimage-0.2.2+
 MKI_SORTFILE := /tmp/isosort
 
 all: $(GLOBAL_DEBUG) prep copy-subdirs copy-tree run-scripts pack-image \
 	postprocess $(GLOBAL_CLEAN_WORKDIR)
 
-prep: $(GLOBAL_DEBUG) dot-disk $(METADATA) imagedir
-
-metadata: dot-base
-	@mkdir -p files/Metadata
-	@rm -f files/Metadata/pkg-groups.tar
-# see also alterator-pkg (backend3/pkg-install); we only tar up what's up to it
-	@tar -cvf files/Metadata/pkg-groups.tar -C $(PKGDIR) \
-		$$(echo $(call list,$(MAIN_GROUPS) .base) \
-			$(call group,$(MAIN_GROUPS)) \
-		   | sed 's,$(PKGDIR)/*,,g')
-
-dot-base:
-	@p="$(call kpackages,$(THE_KMODULES) $(BASE_KMODULES),$(KFLAVOURS))"; \
-	echo -e "\n## added by build-distro.mk\n$$p" >> $(call list,.base); \
-	if [ -n "$$DOT_BASE" ]; then \
-		echo -e "\n## DOT_BASE\n$$DOT_BASE" >> $(call list,.base); \
-	fi
+prep: $(GLOBAL_DEBUG) dot-disk $(WHATEVER) imagedir
+#prep: $(GLOBAL_DEBUG) dot-disk metadata imagedir
 
 dot-disk:
 	@mkdir -p files/.disk

features.in/install2/config.mk

@@ -1,4 +1,4 @@
-use/install2: use/stage2 sub/stage2/install2 use/cleanup/installer
+use/install2: use/stage2 sub/stage2/install2 use/metadata use/cleanup/installer
 	@$(call add_feature)
 	@$(call set,INSTALL2_PACKAGES,installer-distro-$$(INSTALLER)-stage2)
 	@$(call add,INSTALL2_PACKAGES,branding-$$(BRANDING)-alterator)

features.in/kernel/config.mk

@@ -0,0 +1,4 @@
+###
+use/kernel:
+	@$(call add_feature)
+	@$(call set,KFLAVOURS,std-def)

features.in/kernel/lib/10-kernel.mk

@@ -0,0 +1,4 @@
+# step 4: build the distribution image
+#         take care for kernel bits
+
+DOT_BASE += $(call kpackages,$(THE_KMODULES) $(BASE_KMODULES),$(KFLAVOURS))

features.in/metadata/README

@@ -0,0 +1,3 @@
+Эта фича занимается метаданными в составе образов --
+в первую очередь инсталяционных и пригодных к установке
+"живых".

features.in/metadata/config.mk

@@ -0,0 +1,2 @@
+use/metadata:
+	@$(call add_feature)

features.in/metadata/lib/50-metadata.mk

@@ -0,0 +1,37 @@
+# step 4: build the distribution image
+
+# package lists are needed for installer and live-install images
+METADIR := files/Metadata
+
+# preparation targets of ../../build-distro/lib/build-distro.mk
+WHATEVER += metadata
+
+# args: name, suffix, command
+define dump-THEM
+if [ -n "$($(1)_$(2))" ]; then echo -e "\n## $(1)_$(2)"; $(3) $($(1)_$(2)); fi;
+endef
+
+dump-PACKAGES = $(call dump-THEM,$(1),PACKAGES,echo)
+dump-LISTS = $(call dump-THEM,$(1),LISTS,cat)
+
+# BASE_PACKAGES, BASE_LISTS and whatever else goes into base install;
+# thus construct requisite .base packagelist for alterator-pkg
+metadata-.base:
+	@cd $(call list,/); \
+	{ \
+		echo "## generated by features.in/metadata/lib/metadata.mk"; \
+		$(foreach p,SYSTEM COMMON THE BASE,$(call dump-PACKAGES,$(p))) \
+		$(foreach l,THE BASE,$(call dump-LISTS,$(l))) \
+		if [ -n "$(DOT_BASE)" ]; then \
+			echo -e "\n## DOT_BASE\n$(DOT_BASE)"; \
+		fi; \
+	} | sed -re '/^[^[:space:]#]/ s/[[:space:]]+/\n/g' > .base
+
+# see also alterator-pkg (backend3/pkg-install);
+# we only tar up what's up to it
+metadata: metadata-.base
+	@mkdir -p $(METADIR); \
+	tar -C $(PKGDIR) -cvf - \
+		$(call rlist,$(MAIN_GROUPS) .base) \
+		$(call rgroup,$(MAIN_GROUPS)) \
+	> $(METADIR)/pkg-groups.tar

image.in/functions.mk

@@ -5,11 +5,13 @@ PKGDIR := $(GLOBAL_BUILDDIR)/pkg
 ARCH ?= $(shell arch | sed 's/i686/i586/')
 DATE ?= $(shell date +%Y%m%d)
 
-# prefix pkglist name with its directory to form a path
-list = $(1:%=$(PKGDIR)/lists/%)
+# prefix pkglist name with its directory to form a path (relative/absolute)
+rlist = $(1:%=lists/%)
+list  = $(addprefix $(PKGDIR)/,$(call rlist,$(1)))
 
-# prefix/suffix group name to form a path
-group = $(1:%=$(PKGDIR)/groups/%.directory)
+# prefix/suffix group name to form a path (relative/absolute)
+rgroup = $(1:%=groups/%.directory)
+group  = $(addprefix $(PKGDIR)/,$(call rgroup,$(1)))
 
 # map first argument (a function) onto second one (an argument list)
 map = $(foreach a,$(2),$(call $(1),$(a)))

lib/distro.mk

@@ -23,8 +23,7 @@ distro/.init: profile/bare
 
 # NB: the last flavour in KFLAVOURS gets to be the default one;
 # the kernel packages regexp evaluation has to take place at build stage
-distro/.base: distro/.init
-	@$(call set,KFLAVOURS,std-def)
+distro/.base: distro/.init use/kernel
 	@$(call set,META_SYSTEM_ID,LINUX)
 	@$(call set,META_VOL_ID,ALT Linux $(ARCH))
 	@$(call set,META_VOL_SET,ALT Linux)

pkg.in/lists/Makefile

@@ -18,13 +18,6 @@ include $(BUILDDIR)/distcfg.mk
 SUFFIX := pkg/lists
 TARGET := $(BUILDDIR)/$(SUFFIX)
 
-# Metadata/ needed only for installers (and not for e.g. syslinux.iso)
-# FIXME: installable live needs it too, don't move to install2 feature
-### see also .../features.in/build-distro/lib/build-distro.mk
-ifneq (,$(findstring install2,$(FEATURES)))
-DOTBASE := dot-base
-endif
-
 all: $(TARGET) $(GLOBAL_DEBUG) $(DOTBASE) copy-lists copy-groups
 	@if type -t git >&/dev/null && cd $(TARGET); then \
 		if [ -n "`git status -s`" ]; then \
@@ -47,23 +40,6 @@ copy-groups:
 		cp -at $(TARGET) -- $(THE_GROUPS) $(MAIN_GROUPS); \
 	fi
 
-# args: name, suffix, command
-define dump-THEM
-if [ -n "$($(1)_$(2))" ]; then echo -e "\n## $(1)_$(2)"; $(3) $($(1)_$(2)); fi;
-endef
-
-dump-PACKAGES = $(call dump-THEM,$(1),PACKAGES,echo)
-dump-LISTS = $(call dump-THEM,$(1),LISTS,cat)
-
-# BASE_PACKAGES, BASE_LISTS and whatever else goes into base install
-dot-base:
-	@# construct .base packagelist for alterator-pkg
-	@{ \
-		echo "## generated by pkg.in/lists/Makefile"; \
-		$(foreach p,SYSTEM COMMON THE BASE,$(call dump-PACKAGES,$(p))) \
-		$(foreach l,THE BASE,$(call dump-LISTS,$(l))) \
-	} | sed -re '/^[^[:space:]#]/ s/[[:space:]]+/\n/g' >$(TARGET)/.base
-
 # do beforehand as foreach gets expanded before recipe execution
 $(TARGET):
 	@mkdir -p $(TARGET)