From ff11b13f9cd3fd565c4d460dcd353310539174ea Mon Sep 17 00:00:00 2001
From: Arthur Benemann <arthur.benemann@gmail.com>
Date: Sat, 5 Jul 2014 22:40:39 -0700
Subject: [PATCH] tools: In install-prereqs-ubuntu.sh add support for relative
 paths

Install the required projects (PX4*) in the same folder from where the script is called.
Install the arm toolchain at /opt
---
 Tools/scripts/install-prereqs-ubuntu.sh | 34 +++++++++++++------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/Tools/scripts/install-prereqs-ubuntu.sh b/Tools/scripts/install-prereqs-ubuntu.sh
index aad9675356..98ff4ec6b9 100755
--- a/Tools/scripts/install-prereqs-ubuntu.sh
+++ b/Tools/scripts/install-prereqs-ubuntu.sh
@@ -1,6 +1,9 @@
 #!/bin/bash
 set -e
 
+CWD=$(pwd)
+OPT="/opt"
+
 BASE_PKGS="gawk make git arduino-core curl"
 SITL_PKGS="g++ python-pip python-matplotlib python-serial python-wxgtk2.8 python-scipy python-opencv python-numpy python-pyparsing ccache"
 PYTHON_PKGS="pymavlink MAVProxy droneapi"
@@ -19,7 +22,6 @@ ARM_TARBALL_URL="https://launchpad.net/gcc-arm-embedded/4.8/4.8-2013-q4-major/+d
 # Ardupilot Tools
 ARDUPILOT_TOOLS="ardupilot/Tools/autotest"
 
-
 function maybe_prompt_user() {
     if $ASSUME_YES; then
         return 0
@@ -59,40 +61,40 @@ $APT_GET install $BASE_PKGS $SITL_PKGS $PX4_PKGS $UBUNTU64_PKGS
 sudo pip -q install $PYTHON_PKGS
 
 
-if [ ! -d ~/PX4Firmware ]; then
-    git clone https://github.com/diydrones/PX4Firmware.git ~/PX4Firmware
+if [ ! -d PX4Firmware ]; then
+    git clone https://github.com/diydrones/PX4Firmware.git
 fi
 
-if [ ! -d ~/PX4NuttX ]; then
-    git clone https://github.com/diydrones/PX4NuttX.git ~/PX4NuttX
+if [ ! -d PX4NuttX ]; then
+    git clone https://github.com/diydrones/PX4NuttX.git
 fi
 
-if [ ! -d ~/$ARM_ROOT ]; then
+if [ ! -d $OPT/$ARM_ROOT ]; then
     (
-        cd ~;
-        curl -OL $ARM_TARBALL_URL;
-        tar xjf ${ARM_TARBALL};
-        rm ${ARM_TARBALL};
+        cd $OPT;
+        sudo wget $ARM_TARBALL_URL;
+        sudo tar xjf ${ARM_TARBALL};
+        sudo rm ${ARM_TARBALL};
     )
 fi
 
-exportline="export PATH=$HOME/$ARM_ROOT/bin:\$PATH";
+exportline="export PATH=$OPT/$ARM_ROOT/bin:\$PATH";
 if ! grep -Fxq "$exportline" ~/.profile ; then
-    if maybe_prompt_user "Add $HOME/$ARM_ROOT/bin to your PATH [Y/n]?" ; then
+    if maybe_prompt_user "Add $OPT/$ARM_ROOT/bin to your PATH [Y/n]?" ; then
         echo $exportline >> ~/.profile
         $exportline
     else
-        echo "Skipping adding $HOME/$ARM_ROOT/bin to PATH."
+        echo "Skipping adding $OPT/$ARM_ROOT/bin to PATH."
     fi
 fi
 
-exportline2="export PATH=$HOME/$ARDUPILOT_TOOLS:\$PATH";
+exportline2="export PATH=$CWD/$ARDUPILOT_TOOLS:\$PATH";
 if ! grep -Fxq "$exportline2" ~/.profile ; then
-    if maybe_prompt_user "Add $HOME/$ARDUPILOT_TOOLS to your PATH [Y/n]?" ; then
+    if maybe_prompt_user "Add $CWD/$ARDUPILOT_TOOLS to your PATH [Y/n]?" ; then
         echo $exportline2 >> ~/.profile
         $exportline2
     else
-        echo "Skipping adding $HOME/$ARDUPILOT_TOOLS to PATH."
+        echo "Skipping adding $CWD/$ARDUPILOT_TOOLS to PATH."
     fi
 fi