check_success() {                                                                                                                                                                                                    
   if [ $? -ne 0 ]                                                                                                                                                                                                   
   then                                                                                                                                                                                                              
      exit 1                                                                                                                                                                                                         
   fi                                                                                                                                                                                                                
}                                                                                                                                                                                                                    
                                                                                                                                                                                                                    
BUILD_LOG=/tmp/build.log 

tar xjf xyz.tar.bz >> $BUILD_LOG 2>&1
check_success