post_install() {
  # Add the 'memgraph' user and group and set permissions on
  # 'var/*/memgraph' directories.
  getent group memgraph >/dev/null || groupadd -r memgraph || exit 1
  getent passwd memgraph >/dev/null || \
    useradd -r -g memgraph -d /var/lib/memgraph memgraph || exit 1
  chown memgraph:memgraph /var/lib/memgraph || exit 1
  chmod 750 /var/lib/memgraph || exit 1
  chown memgraph:adm /var/log/memgraph || exit 1
  chmod 750 /var/log/memgraph || exit 1
  # Make examples directory immutable (optional)
  chattr +i -R /usr/share/memgraph/examples || true
  echo "Enable and start 'memgraph.service' to use Memgraph" || exit 1
}

pre_remove() {
  # Remove optional immutability from examples directory to allow removal
  chattr -i -R /usr/share/memgraph/examples || true
  systemctl disable memgraph.service
}