pre_upgrade() {
  # Remove socket activation. See: https://bugs.archlinux.org/task/62248
  if (( "$(vercmp $2 8.0p1-3)" < 0 )); then
    if systemctl is-enabled -q "sshd.socket"; then
      cat <<EOF
==> This package no longer provides sshd.socket and sshd@.service;
==> copies of those files will be placed under /etc/systemd/system
==> but please migrate to sshd.service whenever possible.
EOF
      for i in "sshd.socket" "sshd@.service"; do
        if [[ ! -e "/etc/systemd/system/${i}" ]]; then
          cp -v "/usr/lib/systemd/system/${i}" "/etc/systemd/system/${i}"
        fi
      done
      systemctl reenable "sshd.socket"
    fi
  fi
}

post_install() {
  cat <<'EOF'
============== B L A R I N G  W A R N I N G  S I R E N  H E R E ================
Be warned, that in order to not outright stomp out existing sshd config files
this package is forced to symlink it's own in upstream's location.

If the user has altered any of that configuration prior, be sure to replace them
with *.pacsave backups!

Thanks, Pacman.
============== B L A R I N G  W A R N I N G  S I R E N  H E R E ================
EOF
}

post_upgrade() {
  post_install

  if (( $(vercmp $2 8.2p1-3) < 0 )); then
    if systemctl is-active "sshd.service" >/dev/null; then
      cat <<EOF
==> After this upgrade, your existing SSH daemon may be unable to accept
==> new connections. To fix this, your SSH daemon will now be restarted.
EOF
      systemctl restart "sshd.service"
    fi
  fi
}