pkg.in: initial profiles/

This is to support Centaurus-like images featuring
more than a single installation profile (e.g.,
"workstation/server/minimal").

Quite a few more modifications are needed to do it
right though as m-p has fallen prey to exactly the
"single root composition" assumption with its current
THE_* variables semantics and processing.

pkg.in/Makefile

@@ -7,6 +7,6 @@ endif
 
 # sequential execution, no reason to haste
 all:
-	@for dir in lists groups; do \
+	@for dir in lists groups profiles; do \
 		$(MAKE) -C $$dir; \
 	done

pkg.in/profiles/Makefile

@@ -0,0 +1,21 @@
+# step 3: copy package profiles referenced in distro configuration
+#         (and only those!) over to $(BUILDDIR)
+
+ifndef BUILDDIR
+$(error BUILDDIR not defined)
+endif
+
+include $(BUILDDIR)/distcfg.mk
+SUFFIX := pkg/profiles
+TARGET := $(BUILDDIR)/$(SUFFIX)
+
+all: $(GLOBAL_DEBUG)
+	@if [ -n "$(PKG_PROFILES)" ]; then \
+		mkdir -p $(TARGET) && \
+		cp -at $(TARGET) -- \
+			$(addsuffix .directory,$(PKG_PROFILES)); \
+		mp-commit "$(TARGET)" "requested $(SUFFIX) copied over"; \
+	fi
+
+debug:
+	@echo "** PKG_PROFILES: $(PKG_PROFILES)"