build: allow creating empty package feeds

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45757

package/Makefile

@@ -138,8 +138,8 @@ endif
 $(curdir)/index: FORCE
 	@echo Generating package index...
 	@for d in $(PACKAGE_SUBDIRS); do ( \
-		[ -d $(PACKAGE_DIR)/$$d ] && \
-			cd $(PACKAGE_DIR)/$$d || continue; \
+		mkdir -p $(PACKAGE_DIR)/$$d; \
+		cd $(PACKAGE_DIR)/$$d || continue; \
 		$(SCRIPT_DIR)/ipkg-make-index.sh . 2>&1 > Packages && \
 			gzip -9c Packages > Packages.gz; \
 	); done

scripts/ipkg-make-index.sh

@@ -9,8 +9,10 @@ if [ -z $pkg_dir ] || [ ! -d $pkg_dir ]; then
 fi
 
 which md5sum >/dev/null 2>&1 || alias md5sum=md5
+empty=1
 
 for pkg in `find $pkg_dir -name '*.ipk' | sort`; do
+	empty=
 	name="${pkg##*/}"
 	name="${name%%_*}"
 	[[ "$name" = "kernel" ]] && continue
@@ -28,3 +30,4 @@ SHA256sum: $sha256sum\\
 Description:/"
 	echo ""
 done
+[ -n "$empty" ] && echo