Function evaluatePolicy

src/node/updater/UpdatePolicy.ts:42–80

({
  installMethod, tier, current, latest, executionStatus, maintenanceWindow,
}: PolicyInput)

 *   | 'ok'.
 */
export const evaluatePolicy = ({
  installMethod, tier, current, latest, executionStatus, maintenanceWindow,
}: PolicyInput): PolicyResult => {
  if (tier === 'off') {
    return {canNotify: false, canManual: false, canAuto: false, canAutonomous: false, reason: 'tier-off'};
  }
  if (compareSemver(current, latest) >= 0) {
    return {canNotify: false, canManual: false, canAuto: false, canAutonomous: false, reason: 'up-to-date'};
  }

  const canNotify = true;
  const writable = WRITABLE_METHODS.has(installMethod);

  if (!writable) {
    return {canNotify, canManual: false, canAuto: false, canAutonomous: false, reason: 'install-method-not-writable'};
  }

  const terminal = executionStatus === 'rollback-failed';
  const canManual = tier === 'manual' || tier === 'auto' || tier === 'autonomous';
  const canAuto = !terminal && (tier === 'auto' || tier === 'autonomous');

  let canAutonomous = false;
  let windowReason: string | null = null;
  if (!terminal && tier === 'autonomous') {
    if (maintenanceWindow == null) {
      windowReason = 'maintenance-window-missing';
    } else if (parseWindow(maintenanceWindow) == null) {
      windowReason = 'maintenance-window-invalid';
    } else {
      canAutonomous = true;
    }
  }

  const reason = terminal
    ? 'rollback-failed-terminal'
    : (windowReason ?? 'ok');

  return {canNotify, canManual, canAuto, canAutonomous, reason};
};