[base system & package/block-extroot] Merged 23110-23112 which allows block-extroot to be

loaded as a module rather than being required to be in the image.  Thanks JoW for pushing
and helping with this.


git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@23113 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/lib/preinit/41_merge_overlay_hooks

@@ -0,0 +1,24 @@
+#!/bin/sh
+# Copyright (C) 2010 OpenWrt.org
+
+merge_overlay_hooks() {
+	jffs2_not_mounted || [ ! -d /tmp/overlay/lib/preinit ] || {
+		echo "- merge overlay components -"
+
+		mkdir -p /tmp/preinit-hook-merge
+		ln -sf /lib/preinit/* /tmp/overlay/lib/preinit/* /tmp/preinit-hook-merge/
+
+		boot_hook_splice_start
+
+		local pipart
+		for pipart in /tmp/preinit-hook-merge/*; do
+			. $pipart
+		done
+
+		boot_hook_splice_finish
+
+		rm -rf /tmp/preinit-hook-merge
+	}
+}
+
+boot_hook_add preinit_mount_root merge_overlay_hooks