commit c9b70c5bdf8ee545563dc4783bb2a5529b6d2088
Author: Matthew Radcliffe <mradcliffe@softpixel.com>
Date:   Sat Jun 8 21:17:15 2013 -0400

    Issue #1871700 by mradcliffe: Add aggregator block upgrade path. This slipped by me, but I'm confident that I have all blocks from Drupal 7 that are still in Drupal 8 (except views).

diff --git a/core/modules/aggregator/aggregator.install b/core/modules/aggregator/aggregator.install
index 7979eba..94135c9 100644
--- a/core/modules/aggregator/aggregator.install
+++ b/core/modules/aggregator/aggregator.install
@@ -331,3 +331,77 @@ function aggregator_update_8001() {
     'initial' => Language::LANGCODE_DEFAULT,
   ));
 }
+
+/**
+ * Migrate aggregator blocks to configuration.
+ *
+ * @ingroup config_upgrade
+ */
+function aggregator_update_8002() {
+  // Provide a map with plugin name and query lookup routine for aggregator
+  // feeds and categories.
+  $map = array(
+    'feed' => array(
+      'plugin' => 'aggregator_feed_block',
+      'query' => db_select('aggregator_feed')->fields('aggregator_feed', array('title')),
+      'query field' => 'fid',
+      'title translation' => '@title feed latest items',
+    ),
+    'category' => array(
+      'plugin' => 'aggregator_category_block',
+      'query' => db_select('aggregator_category')->fields('aggregator_category', array('title')),
+      'query field' => 'cid',
+      'title translation' => '@title category latest items',
+    ),
+  );
+
+  $results = db_select('block')->condition('module', 'aggregator')->fields('block')->execute()->fetchAll();
+
+  foreach ($results as $block) {
+    // Assemble properties to pass into block config update function.
+
+    // Get the block type and the derivative based on the delta.
+    list($type, $derivative) = explode('-', $block->delta);
+
+    // Get the category or feed title from the respective table in the map.
+    $query = $map[$type]['query'];
+    $title = $query
+      ->condition($map[$type]['query field'], $derivative)
+      ->execute()
+      ->fetchField();
+
+    // Add the proper derivative title from translation in the map, and remove
+    // unnecessary characters.
+    $label = empty($block->title) ? t($map[$type]['title translation'], array('@title' => $title)) : $block->title;
+    $id = $block->theme . '.' . strtolower(preg_replace('/[^A-Za-z0-9\_]+/', '_', $label));
+    $block_name = 'block.block.' . $id;
+
+    $properties = array(
+      'id' => $id,
+      'plugin' => $map[$type]['plugin'] . ':' . $derivative,
+      'weight' => $block->weight,
+      'status' => $block->status,
+      'region' => $block->region,
+      'visibility' => array(
+        'path' => array(
+          'visibility' => $block->visibility,
+          'pages' => $block->pages,
+        ),
+        'role' => array(
+          'roles' => array(),
+        ),
+        'node_type' => array(
+          'types' => array(),
+        ),
+      ),
+      'settings' => array(
+        'cache' => $block->cache,
+        'label' => $label,
+        'module' => 'aggregator',
+        'block_count' => '10',
+      ),
+    );
+
+    update_block_to_config($block_name, 'aggregator', $block->delta, $properties);
+  }
+}