introduced add_feature function

The features might get copy-pasted (or even copied-and-pruned)
when initialized; there's an unneccessary duplication of the
function name in the line adding it to FEATURES list, thus
prone to being forgotten and causing some havoc later on.

It was wrong in the first place but tackling this with some
double-colon rules ran into terminality issues, and further
tortures were considered unneccessary.

The current solution isn't perfect (no completely transparent
function name registration upon corresponding target being called)
but at least it is an improvement...

README

@@ -47,8 +47,7 @@ Most docs are in Russian, welcome to learn it or ask for English.
   + законченные блоки функциональности (или наборы таковых)
   + описываются в индивидуальных features.in/*/config.mk
   + могут требовать другие фичи, а также субпрофили
-  + при сборке $(BUILDDIR) содержимое указанных в $(FEATURES) фич
+  + при сборке $(BUILDDIR) содержимое фич добавляется в профиль
-    добавляется в профиль с постобработкой (generate.*)
 - списки пакетов (*_LISTS):
   + просьба по возможности избегать дублирования
 - индивидуальные пакеты (*_PACKAGES): см. тж. conf.d/README

features.in/00example/config.mk

@@ -9,5 +9,5 @@
 # for somewhat more involved example, see syslinux feature
 
 use/00example: sub/main use/anotherfeature
-	@$(call add,FEATURES,00example)
+	@$(call add_feature)
 	@$(call add,MAIN_PACKAGES,hello)

features.in/README

@@ -7,7 +7,8 @@
 в ../Makefile; он может описывать одну или более целей
 вида use/*, дополняющих конфигурацию, и при наличии
 дополнительных хуков для копирования или generate.*
-должен добавить имя фичи в $(FEATURES).
+обязан добавить имя фичи в $(FEATURES), для чего
+создана функция add_feature без аргументов.
 
 На этапе генерации сборочного профиля фичи рассматриваются
 после инициализации профиля (см. ../image.in/) и копирования

features.in/build-distro/config.mk

@@ -1,2 +1,2 @@
 use/build-distro: boot/isolinux
-	@$(call add,FEATURES,build-distro)
+	@$(call add_feature)

features.in/build-ve/config.mk

@@ -1,2 +1,2 @@
 use/build-ve:
-	@$(call add,FEATURES,build-ve)
+	@$(call add_feature)

features.in/cleanup/config.mk

@@ -1,5 +1,5 @@
 use/cleanup:
-	@$(call add,FEATURES,cleanup)
+	@$(call add_feature)
 
 use/cleanup/installer: use/cleanup
 	@$(call add,CLEANUP_PACKAGES,'installer-*')

features.in/dev/config.mk

@@ -1,5 +1,5 @@
 use/dev:
-	@$(call add,FEATURES,dev)
+	@$(call add_feature)
 	@$(call add,COMMON_PACKAGES,git-core hasher gear)
 
 use/dev/mkimage: use/dev

features.in/dos/config.mk

@@ -1,5 +1,5 @@
 use/dos: use/syslinux
-	@$(call add,FEATURES,dos)
+	@$(call add_feature)
 	@$(call add,SYSLINUX_CFG,dos)
 	@$(call add,SYSLINUX_FILES,/usr/lib/syslinux/memdisk)
 	@$(call add,STAGE1_PACKAGES,make-freedos-floppy glibc-gconv-modules)

features.in/hdt/config.mk

@@ -1,4 +1,4 @@
 use/hdt: use/syslinux use/memtest
-	@$(call add,FEATURES,hdt)
+	@$(call add_feature)
 	@$(call add,STAGE1_PACKAGES,pciids)
 	@$(call add,SYSLINUX_MODULES,hdt)

features.in/install2/config.mk

@@ -1,5 +1,5 @@
 use/install2: use/stage2 sub/stage2/install2 use/cleanup/installer
-	@$(call add,FEATURES,install2)
+	@$(call add_feature)
 	@$(call set,INSTALL2_PACKAGES,installer-distro-$$(INSTALLER)-stage2)
 	@$(call add,INSTALL2_PACKAGES,branding-$$(BRANDING)-alterator)
 	@$(call add,MAIN_PACKAGES,branding-$$(BRANDING)-release)

features.in/isomd5sum/config.mk

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

features.in/live/config.mk

@@ -1,5 +1,5 @@
 use/live: use/stage2 sub/stage2/live
-	@$(call add,FEATURES,live)
+	@$(call add_feature)
 
 use/live/base: use/live use/syslinux/ui-menu
 	@$(call add,LIVE_LISTS,$(call tags,base && (live || network)))

features.in/lowmem/config.mk

@@ -1,4 +1,4 @@
 use/lowmem: use/install2
-	@$(call add,FEATURES,lowmem)
+	@$(call add_feature)
 # TODO: http://www.altlinux.org/Branding/slideshow => disable?
 #       also installer-feature-rm-slideshow

features.in/memtest/config.mk

@@ -1,4 +1,4 @@
 use/memtest: use/syslinux
-	@$(call add,FEATURES,memtest)
+	@$(call add_feature)
 	@$(call add,SYSTEM_PACKAGES,memtest86+)
 	@$(call add,SYSLINUX_CFG,memtest)

features.in/pack/config.mk

@@ -2,7 +2,7 @@ DISTRO_EXTS := .iso
 VE_EXTS     := .tar .tgz
 
 use/pack:
-	@$(call add,FEATURES,pack)
+	@$(call add_feature)
 
 use/pack/iso: use/pack boot/isolinux
 ifeq (distro,$(IMAGE_CLASS))

features.in/repo/config.mk

@@ -1,4 +1,4 @@
 use/repo:
-	@$(call add,FEATURES,repo)
+	@$(call add_feature)
 
 use/repo/main: sub/main use/repo

features.in/rescue/config.mk

@@ -1,4 +1,4 @@
 use/rescue: use/stage2 sub/stage2/rescue
-	@$(call add,FEATURES,rescue)
+	@$(call add_feature)
 	@$(call add,RESCUE_LISTS,$(call tags,base && (rescue || network)))
 	@$(call add,RESCUE_LISTS,$(call tags,extra network))

features.in/stage2/config.mk

@@ -1,6 +1,6 @@
 # "1" is not a typo
 use/stage2: sub/stage1
-	@$(call add,FEATURES,stage2)
+	@$(call add_feature)
 	@$(call add,STAGE1_PACKAGES,file make-initrd make-initrd-propagator)
 
 # NB: sub/stage2 isn't used standalone but rather

features.in/syslinux/config.mk

@@ -1,6 +1,6 @@
 # default is plain text prompt
 use/syslinux: sub/stage1
-	@$(call add,FEATURES,syslinux)
+	@$(call add_feature)
 	@$(call add,STAGE1_PACKAGES,syslinux)
 
 # UI is overwritten

features.in/systemd/config.mk

@@ -1,4 +1,4 @@
 use/systemd:
-	@$(call add,FEATURES,systemd)
+	@$(call add_feature)
 	@$(call add,COMMON_PACKAGES,systemd systemd-units systemd-sysvinit)
 	@$(call add,COMMON_PACKAGES,installer-feature-systemd-stage3)

lib/functions.mk

@@ -42,6 +42,9 @@ define log_body
 	grep -q '^# $@$$' "$(CONFIG)" || printf '# %s\n' '$@' >> "$(CONFIG)"; }
 endef
 
+# in a use/feature/particularly target, we need a "feature" bit
+add_feature = $(call add,FEATURES,$(word 2,$(subst /, ,$@)))
+
 # convert tag list into a list of relative package list paths
 # NB: tags can do boolean expressions: (tag1 && !(tag2 || tag3))
 tags = $(and $(strip $(1)),$(addprefix tagged/,$(shell echo "$(1)" | bin/tags2lists pkg.in/lists/tagged)))