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_migrate_taskeract_linux_dns() {
  local legacy_conf="/etc/systemd/resolved.conf.d/taskeract.conf"
  local delegate_conf="/etc/systemd/dns-delegate.d/taskeract.dns-delegate"
  local systemd_version=""

  if ! command -v systemctl >/dev/null 2>&1; then
    return 0
  fi

  systemd_version="$(systemctl --version 2>/dev/null | awk 'NR==1 { print $2 }')"
  if ! [ "${systemd_version}" -ge 258 ] 2>/dev/null; then
    return 0
  fi

  # Only migrate existing Taskeract DNS registrations. Fresh installs still let
  # the app opt the user into DNS setup explicitly.
  if [ ! -f "${legacy_conf}" ] && [ ! -f "${delegate_conf}" ]; then
    return 0
  fi

  mkdir -p /etc/systemd/dns-delegate.d
  cat > "${delegate_conf}" <<'DNSEOF'
[Delegate]
DNS=127.0.0.1:5453
Domains=~tact
DefaultRoute=no
DNSEOF
  rm -f "${legacy_conf}"
  systemctl restart systemd-resolved >/dev/null 2>&1 || true
}

post_install() {
  _migrate_taskeract_linux_dns

  # Grant CAP_NET_BIND_SERVICE so Taskeract can bind to port 443 for .tact domains.
  if command -v setcap >/dev/null 2>&1; then
    setcap cap_net_bind_service=+ep /usr/bin/taskeract || true
  fi

  # Register taskeract:// URI scheme
  if command -v xdg-mime >/dev/null 2>&1; then
    xdg-mime default taskeract.desktop x-scheme-handler/taskeract || true
  fi
  if command -v update-desktop-database >/dev/null 2>&1; then
    update-desktop-database /usr/share/applications || true
  fi
}

post_upgrade() {
  post_install
}