--- /dev/null
+#!/bin/sh
+
+set -e
+
+REPO=${REPO:-git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git}
+
+if [ ! -d linux ]; then
+ git clone --reference ~/src/linux/master $REPO linux
+fi
+
+cd linux
+git fetch $REPO
+git reset --hard FETCH_HEAD