ohmu/third/drupal/mustikas11/restrict_instruction_front.php

<?php
use Drupal\block\Entity\Block;

// Piira anonüümse avalehe juhendteksti blokk ainult avalehele.
// D7 analogg: node/3 body PHP `if (drupal_is_front_page() && !$user->uid)`.
// NB! kasutame nii <front> kui ka /node/5 ja / — sest avalehele anonüümse
// juurdepääsu korral (403) on current path kas / või /node/5.
$block = Block::load('anonymous_front_instruction');
if (!$block) {
  echo "BLOCK anonymous_front_instruction NOT FOUND\n";
  exit;
}

$visibility = $block->get('visibility');
$visibility['request_path'] = [
  'id' => 'request_path',
  'negate' => FALSE,
  'pages' => "<front>\n/node/5\n/",
];
$block->set('visibility', $visibility);
$block->save();

echo "request_path visibility added (pages=<front>+/node/5+/)\n";