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

post_install() {
  cat <<EOF

IMPORTANT SECURITY NOTE:
This PKGBUILD does NOT (!!!) follow the upstream
OpenSSH-Portable distribution (at
https://github.com/openssh/openssh-portable ) but rather a
fork which is maintained by rapier (primarily for Gentoo
Linux I believe). The fork includes the HPN patches and can be
found at https://github.com/rapier1/openssh-portable

Since I do NOT maintain this fork in any way, but merely
package it for Arch Linux, there is absolutely no warranty for
this code. It is very possible that the current version of the
fork still contains open security bugs which have already been
fixed in upstream OpenSSH.

USE THIS PKGBUILD AT YOUR OWN RISK AND ONLY IF YOU FULLY
UNDERSTAND THE SECURITY IMPLICATIONS OF NOT USING THE MOST
RECENT OFFICIAL OPENSSH !

Consider yourself warned.

If security is paramount for you or in case of any doubt,
please use the official OpenSSH distribution instead.

EOF
}

post_upgrade() {
  post_install

  if (( $(vercmp $2 8.2p1-3) < 0 )); then
    if systemctl is-active "hpnsshd.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 "hpnsshd.service"
    fi
  fi
}