fix set_openair() function to be correct from any launching directory

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@6034 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/build_helper.bash

@@ -872,18 +872,19 @@ create_hss_database(){
 ###############################
 set_openair_env(){
 
-    index=`pwd | grep -b -o /targets | cut -d: -f1`
-    if [ $index = "" ] ; then
-	echo_error "Please run the script from targets directory or any child directories"
-    else 
-	oai_path=`pwd | cut -c1-$index`
-	export OPENAIR_HOME=$oai_path
-	export OPENAIR1_DIR=$oai_path/openair1
-	export OPENAIR2_DIR=$oai_path/openair2
-	export OPENAIR3_DIR=$oai_path/openair3
-	export OPENAIR_TARGETS=$oai_path/targets
-	export OPENAIRCN_DIR=$oai_path/openair-cn
-    fi
+    fullpath=`readlink -f $BASH_SOURCE`
+    [ -f "/.$fullpath" ] || fullpath=`readlink -f $PWD/$fullpath`
+    openair_path=${fullpath%/targets/*}
+    openair_path=${openair_path%/openair-cn/*}
+    openair_path=${openair_path%/openair[123]/*}
+
+    export OPENAIR_DIR=$openair_path
+    export OPENAIR_HOME=$openair_path
+    export OPENAIR1_DIR=$openair_path/openair1
+    export OPENAIR2_DIR=$openair_path/openair2
+    export OPENAIR3_DIR=$openair_path/openair3
+    export OPENAIRCN_DIR=$openair_path/openair-cn
+    export OPENAIR_TARGETS=$openair_path/targets
 
 }