scripts: add new script 'native'

Added 'native' convenience shell script to run native tools.
Example of usage:
  > bitbake bmap-tools-native
  > native bmaptool --version

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/scripts/native b/scripts/native
new file mode 100755 (executable)
index 0000000..496e34f
--- /dev/null
+++ b/scripts/native
@@ -0,0 +1,48 @@
+#!/bin/sh
+#
+# Copyright (c) 2016,  Intel Corporation.
+# All Rights Reserved
+#
+# This program is free software;  you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY;  without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+# the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program;  if not, see <http://www.gnu.org/licenses/>
+#
+
+#
+# This script is for running tools from native oe sysroot
+#
+
+if [ $# -lt 1 -o "$1" = '--help' -o "$1" = '-h' ] ; then
+    echo "Usage: $0 <native tool> [parameters]"
+    exit 1
+fi
+
+SYSROOT_SETUP_SCRIPT=`which oe-find-native-sysroot 2> /dev/null`
+if [ -z "$SYSROOT_SETUP_SCRIPT" ]; then
+        echo "Error: Unable to find oe-find-native-sysroot script"
+        exit 1
+fi
+. $SYSROOT_SETUP_SCRIPT
+
+OLDPATH=$PATH
+
+# look for a tool only in native sysroot
+PATH=$OECORE_NATIVE_SYSROOT/usr/bin:$OECORE_NATIVE_SYSROOT/bin:$OECORE_NATIVE_SYSROOT/usr/sbin:$OECORE_NATIVE_SYSROOT/sbin
+tool=`/usr/bin/which $1 2>/dev/null`
+
+if [ -n "$tool" ] ; then
+    # add old path to allow usage of host tools
+    PATH=$PATH:$OLD_PATH $@
+else
+    echo "Error: Unable to find '$1' in native sysroot"
+    exit 1
+fi