tools: add a script to sync the kernel header files

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tools/sync-with-kernel-headers.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+#
+# Syncs the repository with the input.h and input-event-codes.h headers from
+# a checked out source directory.
+#
+# Usage:
+#    sync-with-kernel-headers.sh path/to/kernel v4.12
+
+KERNEL_TREE="$1"
+GIT_DIR="$KERNEL_TREE/.git"
+TAG="$2"
+
+export GIT_DIR
+
+if [ -z "$TAG" ] || ! [ -d "$GIT_DIR" ]; then
+	echo "Usage: `basename $0` path/to/kernel tag"
+	exit 1
+fi
+if ! [ -d .git ]; then
+	echo "Run me from the top-level git tree"
+	exit 1
+fi
+
+files="linux/input.h linux/input-event-codes.h"
+
+
+for file in $files; do
+	git cat-file -p "$TAG:include/uapi/$file" > "include/$file"
+done
+