Exit when user is root

InstallCrossCompiler.sh

@@ -3,6 +3,7 @@
 # Version: 0.2.0 - Alpha
 #
 # Changelog:
+#  0.2.1 - 21.03.19: Exit if user is root
 #  0.2.0 - 07.03.19: Build ARM Cortex-A9 Cross Compiler
 #  0.1.0 - 06.03.19: Build MicroBlaze Cross Compiler
 #
@@ -28,6 +29,10 @@ NEWLIB_VERSION="3.1.0"
 #chown -R ralf:ralf /opt/mbxc
 #exit
 # TODO: Check permissions - no run for root
+if [ "$(id -u)" == 0 ] ; then
+    echo -e "\e[1;31mThis script shall  not  be executed with root permissions!\e[0m"
+    exit 1
+fi
 
 # Create temporary director for building the compiler
 mkdir -p $TMPDIR