Ticket #18490: class-wp-upgrader.patch

wp-admin/includes/class-wp-upgrader.php

@@ -1351 +1351 @@
 
                 $install_actions = array(
                         'preview' => '<a href="' . $preview_link . '" class="thickbox thickbox-preview" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $name)) . '">' . __('Preview') . '</a>',
-                        'activate' => '<a href="' . $activate_link .  '" class="activatelink" title="' . esc_attr( sprintf( __('Activate &#8220;%s&#8221;'), $name ) ) . '">' . __('Activate') . '</a>'
-                                                        );
+                        'activate' => '<a href="' . $activate_link . '" class="activatelink" title="' . esc_attr( sprintf( __('Activate &#8220;%s&#8221;'), $name ) ) . '">' . __('Activate') . '</a>'
+                );
 
+                if( ! empty( $template ) ) {
+                        global $wp_filesystem;
+                        $themes_dir = $wp_filesystem->wp_themes_dir();
+                        $template_data = get_theme_data( $themes_dir . $template . '/style.css' );
+
+                        if( empty( $template_data[ 'Name' ] ) ) {
+                                unset( $install_actions[ 'activate' ] ); 
+                                echo sprintf( __( 'Unable to locate the required parent theme: <strong>%1$s</strong>.<br />You will need to install the parent theme before being able to activate this theme.' ) , $template );
+                        }
+                }
+
                 if ( is_network_admin() && current_user_can( 'manage_network_themes' ) )
                         $install_actions['network_enable'] = '<a href="' . esc_url( wp_nonce_url( 'themes.php?action=enable&amp;theme=' . $template, 'enable-theme_' . $template ) ) . '" title="' . esc_attr__( 'Enable this theme for all sites in this network' ) . '" target="_parent">' . __( 'Network Enable' ) . '</a>';
 
@@ -1458 +1469 @@
                         $this->package = $uploads['basedir'] . '/' . $this->filename;
                 }
         }
-}
- No newline at end of file
+}