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<title>[57021] trunk: Upgrade/Install: Skip registering theme block patterns during the upgrade process.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/57021">57021</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/57021","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>joemcgill</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-10-27 19:02:54 +0000 (Fri, 27 Oct 2023)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Upgrade/Install: Skip registering theme block patterns during the upgrade process.

This fixes a bug during the database upgrade process where a theme's `functions.php` file may not be loaded, leading to potential exceptions if the theme's pattern files use symbols (classes, functions, constants, etc.) that are declared only when the `functions.php` file is loaded. To do so, a check for `wp_get_active_and_valid_themes()` is added early to `_register_theme_block_patterns()`, which returns early if no active or valid themes are returned.

Props fabiankaegy, rajinsharwar, pbiron, huzaifaalmesbah, hellofromTonya, peterwilsoncc, joemcgill.
Fixes <a href="https://core.trac.wordpress.org/ticket/59723">#59723</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesblockpatternsphp">trunk/src/wp-includes/block-patterns.php</a></li>
<li><a href="#trunktestsphpunittestsblockswpBlockPatternsRegistryphp">trunk/tests/phpunit/tests/blocks/wpBlockPatternsRegistry.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesblockpatternsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/block-patterns.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/block-patterns.php  2023-10-27 18:34:11 UTC (rev 57020)
+++ trunk/src/wp-includes/block-patterns.php    2023-10-27 19:02:54 UTC (rev 57021)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -328,7 +328,18 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * @access private
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function _register_theme_block_patterns() {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
</ins><span class="cx" style="display: block; padding: 0 10px">         /*
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * During the bootstrap process, a check for active and valid themes is run.
+        * If no themes are returned, the theme's functions.php file will not be loaded,
+        * which can lead to errors if patterns expect some variables or constants to
+        * already be set at this point, so bail early if that is the case.
+        */
+       if ( empty( wp_get_active_and_valid_themes() ) ) {
+               return;
+       }
+
+       /*
</ins><span class="cx" style="display: block; padding: 0 10px">          * Register patterns for the active theme. If the theme is a child theme,
</span><span class="cx" style="display: block; padding: 0 10px">         * let it override any patterns from the parent theme that shares the same slug.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span></span></pre></div>
<a id="trunktestsphpunittestsblockswpBlockPatternsRegistryphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/blocks/wpBlockPatternsRegistry.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/blocks/wpBlockPatternsRegistry.php      2023-10-27 18:34:11 UTC (rev 57020)
+++ trunk/tests/phpunit/tests/blocks/wpBlockPatternsRegistry.php        2023-10-27 19:02:54 UTC (rev 57021)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -482,4 +482,68 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $result = $this->registry->is_registered( 'test/one' );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertTrue( $result );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * Ensures theme patterns are registered on init.
+        *
+        * @ticket 59723
+        *
+        * @covers ::_register_theme_block_patterns
+        */
+       public function test_register_theme_block_patterns_on_init() {
+               // This test needs to use access static class properties.
+               $registry = WP_Block_Patterns_Registry::get_instance();
+
+               // Ensure we're using a theme with patterns.
+               switch_theme( 'twentytwentythree' );
+
+               $theme          = wp_get_theme();
+               $theme_patterns = array_values( wp_list_pluck( $theme->get_block_patterns(), 'slug' ) );
+
+               // This helper is fired on the init hook.
+               _register_theme_block_patterns();
+
+               $registered = wp_list_pluck( $registry->get_all_registered(), 'name' );
+
+               // Cleanup patterns registry.
+               foreach ( $theme_patterns as $pattern ) {
+                       $registry->unregister( $pattern );
+               }
+
+               $this->assertSameSets( $theme_patterns, array_intersect( $theme_patterns, $registered ), 'Could not confirm theme patterns were registered.' );
+       }
+
+       /**
+        * Ensures theme patterns are not registered when no themes are active and valid.
+        *
+        * @ticket 59723
+        *
+        * @covers ::_register_theme_block_patterns
+        */
+       public function test_register_theme_block_patterns_on_init_skipped_during_install() {
+               // This test needs to use access static class properties.
+               $registry = WP_Block_Patterns_Registry::get_instance();
+
+               // Ensure we're using a theme with patterns.
+               switch_theme( 'twentytwentythree' );
+
+               $theme          = wp_get_theme();
+               $theme_patterns = array_values( wp_list_pluck( $theme->get_block_patterns(), 'slug' ) );
+
+               /*
+                * This will short-circuit theme activation.
+                * @see wp_get_active_and_valid_themes().
+                */
+               wp_installing( true );
+
+               // This helper is fired on the init hook.
+               _register_theme_block_patterns();
+
+               $registered = wp_list_pluck( $registry->get_all_registered(), 'name' );
+
+               // Cleanup.
+               wp_installing( false );
+
+               $this->assertEmpty( array_intersect( $theme_patterns, $registered ), 'Theme patterns were were incorrectly registered.' );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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