Fix build_script to exit on failure.

build_script

@@ -8,7 +8,7 @@ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > /home/che
 
 chmod a+x /home/chewbacca/bin/repo
 
-sudo -i -u chewbacca /bin/bash << EOF
+sudo su chewbacca 
 
 cd /home/chewbacca
 
@@ -64,7 +64,16 @@ bitbake vesta-image-minimal
 
 if [ $? -ne 0 ]; then echo vesta-100 minimal build FAILED; exit 1; fi
 
-EOF
+#check the exit code again. We were running as user chewbacca so if
+#an exit 1 was executed it will exit user chewbacca and back into root.
+#This will require another exit 1 to stop the build and report the error
+#as intended
+if [ $? -ne 0 ]; then 
+    echo build FAILED
+    exit 1
+else
+    exit
+fi
 
 #clean out old images
 rm -rf /artifacts/*