live, image.in: use function for get lists from groups (for live)

features.in/live/live/stage2cfg.mk

@@ -6,8 +6,8 @@ IMAGE_PACKAGES_REGEXP = $(LIVE_PACKAGES_REGEXP) $(THE_PACKAGES_REGEXP)
 
 IMAGE_PACKAGES = $(COMMON_PACKAGES) $(LIVE_PACKAGES) $(THE_PACKAGES) \
 		 $(call map,list, \
-			$(LIVE_LISTS) $(LIVE_GROUPS) \
-			$(THE_LISTS) $(THE_GROUPS) \
+			$(LIVE_LISTS) $(THE_LISTS) \
+			$(call live_groups2lists) \
 			$(COMMON_LISTS)) \
 		 interactivesystem
 

image.in/functions.mk

@@ -54,6 +54,16 @@ $(if $(filter groups2lists,$(0)),$(shell \
 ))
 endef
 
+define live_groups2lists
+$(if $(filter live_groups2lists,$(0)),$(shell \
+	  if [ -n "$(THE_GROUPS)$(LIVE_GROUPS)" ]; then \
+	    sed -rn 's,^X-Alterator-PackageList=(.*)$$,\1,p' \
+	    $(call map,group,$(THE_GROUPS) $(LIVE_GROUPS)) | \
+	    sed 's/;/\n/g'; \
+	  fi; \
+))
+endef
+
 # kernel package list generation; see also #24669
 NULL :=
 SPACE := $(NULL) # the officially documented way of getting a space