add uci_set_default (to be used in init scripts or /etc/uci-defaults)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10086 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/etc/functions.sh

@@ -217,3 +217,9 @@ jffs2_mark_erase() {
 	}
 	echo -e "\xde\xad\xc0\xde" | mtd -qq write - "$1"
 }
+
+uci_set_default() {
+	local PACKAGE="$1"
+	[ -e "/etc/config/$1" ] && return 0
+	cat > "/etc/config/$1"
+}