Check Rocky Linux release in shell script

Rocky Linux Help & Support
1

Hi,

This is basically a Bash scripting question, but since it concerns Rocky Linux, I thought I might as well ask here.

The following code snippet checks if the script is running on Rocky Linux 8.x and exits if this is not the case:

# Make sure we're running Rocky Linux 8.x.
if [ -f /etc/os-release ]
then
  source /etc/os-release
  OS="${ROCKY_SUPPORT_PRODUCT}"
  VER="${ROCKY_SUPPORT_PRODUCT_VERSION}"
else
  echo
  echo "Unsupported operating system." >&2
  echo
  exit 1
fi
if [ "${OS}" != "Rocky Linux" ] && [ "${VER}" != "8" ]
then
  echo
  echo "Unsupported operating system." >&2
  echo
  exit 1
fi

Is there a way to write this in a more elegant in compact manner? My Bash scripting skills are a bit rusty.

Thanks & cheers from the sunny South of France,

Niki