#!/bin/sh

sd_booted() {
  [ -d /run/systemd/system ]
}

add_privs() {
  if ! setcap "$2" "$1" 2>/dev/null; then
    echo "==> Warning: setcap failed, falling back to setuid root on /$1"
    chmod u+s "$1"
  fi
}

add_journal_acls() {
  # ignore errors, since the filesystem might not support ACLs
  setfacl -Rnm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/ 2>/dev/null
  :
}

maybe_reexec() {
  # don't reexec on 209-1 upgrade due to large infrastructural changes.
  if [ "$(vercmp 209-1 "$2")" -eq 1 ]; then
    echo ':: systemd has not been reexecuted. It is recommended that you'
    echo '   reboot at your earliest convenience.'
    return
  fi

  if sd_booted; then
    systemctl --system daemon-reexec
  fi
}

_dir_empty() {
  set -- "$1"/*
  [ ! -e "$1" ] && [ ! -L "$1" ]
}

post_common() {
  systemd-machine-id-setup

  add_privs usr/bin/systemd-detect-virt 'cap_dac_override,cap_sys_ptrace+ep'

  udevadm hwdb --update
  journalctl --update-catalog
}

_208_changes() {
  chown root:systemd-journal var/log/journal
  chmod 2755 var/log/journal

  if [ -e var/lib/backlight ] && [ ! -e var/lib/systemd/backlight ]; then
    mv -T var/lib/backlight var/lib/systemd/backlight
  fi

  if [ -e var/lib/random-seed ] && [ ! -e var/lib/systemd/random-seed ]; then
    mv -T var/lib/random-seed var/lib/systemd/random-seed
  fi
}

_209_changes() {
  # attempt to preserve existing behavior

  local old_rule=etc/udev/rules.d/80-net-name-slot.rules
  local new_rule=etc/udev/rules.d/80-net-setup-link.rules

  echo ":: Network device naming is now controlled by udev's net_setup_link"
  echo "   builtin. Refer to the systemd.link manpage for a full description."

  # not clear what action we can take here, so don't do anything
  [[ -e $new_rule ]] && return 0

  # rename the old rule to the new one so that we preserve the user's
  # existing option.
  if [[ -e $old_rule ]]; then
    printf ':: Renaming %s to %s in order\n' "${old_rule##*/}" "${new_rule##*/}"
    printf '   to preserve existing network naming behavior.\n'
    mv -v "$old_rule" "$new_rule"
  else
    echo ':: No changes have been made to your network naming configuration.'
    echo '   Interfaces should continue to maintain the same names.'
  fi
}

_210_changes() {
  if sd_booted; then
    # If /etc/systemd/network is non-empty, then this is a 209 user who used
    # networkd. Re-enable it for them.
    if ! _dir_empty etc/systemd/network; then
      systemctl enable systemd-networkd
    fi
  fi
}

post_install() {
  post_common "$@"

  add_journal_acls

  # enable getty@tty1 by default, but don't track the file
  systemctl enable getty@tty1.service

  echo ":: Append 'init=/usr/lib/systemd/systemd' to your kernel command line in your"
  echo "   bootloader to replace sysvinit with systemd, or install systemd-sysvcompat"
}

post_upgrade() {
  post_common "$@"

  maybe_reexec "$@"

  if [ "$(vercmp 204-1 "$2")" -eq 1 ]; then
    printf '==> The /bin/systemd symlink has been removed. Any references in your\n'
    printf '    bootloader (or elsewhere) must be updated to /usr/lib/systemd/systemd.\n'
  fi

  if [ "$(vercmp 205-1 "$2")" -eq 1 ]; then
    printf '==> systemd 205 restructures the cgroup hierarchy and changes internal\n'
    printf '    protocols. You should reboot at your earliest convenience.\n'
  fi

  if [ "$(vercmp 206-1 "$2")" -eq 1 ]; then
    printf '==> The "timestamp" hook for mkinitcpio no longer exists. If you used\n'
    printf '    this hook, you must remove it from /etc/mkinitcpio.conf. A "systemd"\n'
    printf '    hook has been added which provides this functionality, and more.\n'
  fi

  if [ "$(vercmp 208-1 "$2")" -eq 1 ]; then
    _208_changes
  fi

  if [ "$(vercmp 208-8 "$2")" -eq 1 ]; then
    add_journal_acls
  fi

  if [ "$(vercmp 209-1 "$2")" -eq 1 ]; then
    _209_changes
  fi

  if [ "$(vercmp 210-1 "$2")" -eq 1 ]; then
    _210_changes
  fi
}

# vim:set ts=2 sw=2 et: