systemname=`uname -a`
#echo $systemname

OSDEFINFO=$(echo "DEFINES += SYSTEM_UBUNTU1804")

ubuntu1804="18.04."
ubuntu1604="16.04."
ubuntu2004="20.04."
resultos=$(echo $systemname | grep "tegra")
if [ "$resultos" != "" ]
then
  OSDEFINFO=$(echo "DEFINES += SYSTEM_AGX")
else
  resultos=$(echo $systemname | grep "Ubuntu")
  if [ "$resultos" != "" ]
  then
    systemname=`lsb_release -a`
    
    result=$(echo $systemname | grep "${ubuntu1804}")
    if [ "$result" != "" ]
    then
#        echo "ubuntu 18.04"
        OSDEFINFO=$(echo "DEFINES += SYSTEM_UBUNTU1804")
    fi

    result=$(echo $systemname | grep "${ubuntu1604}")
    if [ "$result" != "" ]
    then
#        echo "ubuntu 16.04"
        OSDEFINFO=$(echo "DEFINES += SYSTEM_UBUNTU1604")
    fi
    
    result=$(echo $systemname | grep "${ubuntu2004}")
    if [ "$result" != "" ]
    then
#        echo "ubuntu 20.04"
        OSDEFINFO=$(echo "DEFINES += SYSTEM_UBUNTU1804") # 20210930 parameters of 20.04 temporarily same as 18.04
    fi
    
  fi
fi



if [ -f "systemdef.pri" ]; then
#  echo "file exist."
  OLDOSDEFINFO=$(sed -n '/DEFINES += SYSTEM/p' systemdef.pri)
#  echo "old:"$OLDOSDEFINFO
  if [ ! "$OSDEFINFO"x = "$OLDOSDEFINFO"x ]; then
	echo "replace DEFINES in systemdef.pri"
	sed -i "s/^.*DEFINES += SYSTEM.*$/$OSDEFINFO/" systemdef.pri 
  fi
else
  echo "systemdef.pri not exist."
  echo $OSDEFINFO >> systemdef.pri
fi