Fix sysupgrade for squashfs, jffs2 and ext4 images

* use 'fsync' with 'dd' for image writing
	* save config to boot partition

SVN-Revision: 32465

target/linux/x86/base-files/lib/preinit/89_move_config

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Copyright (C) 2012 OpenWrt.org
+
+move_config() {
+	local rootfsdev
+	local rootfstype
+	
+	rootfstype="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "rootfstype") { print $2 }' < /proc/cmdline)"
+	case "$rootfstype" in
+		squashfs|jffs2)
+			rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "block2mtd.block2mtd") { print substr($2,1,index($2, ",")-1) }' < /proc/cmdline)";;
+		ext4)
+			rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "root") { print $2 }' < /proc/cmdline)";;
+	esac
+
+	mount -t ext4 -o rw,noatime "${rootfsdev%[0-9]}1" /mnt
+	mv -f /mnt/sysupgrade.tgz /
+	umount /mnt
+}
+
+boot_hook_add preinit_main move_config
+