Upgrade/Install: Pass stored credentials to `WP_Filesystem()` where appropriate.

With the introduction of temporary backups of plugins and themes before updating, a new Site Health test was added to verify that plugin and theme temporary backup directories are writable or can be created.

When using a non-direct filesystem, the Site Health test did not include the required credentials, leading to a fatal error as the connection was not initialized properly.

This commit attemps to use the stored credentials if available, and displays a message otherwise.

Includes a similar fix in a function that performs a cleanup of the temporary backup directory.

Follow-up to [55720].

Props utsav72640, rajinsharwar, costdev, mukesh27, peterwilsoncc, audrasjb, SergeyBiryukov.
See #58940.
Built from https://develop.svn.wordpress.org/trunk@56341


git-svn-id: http://core.svn.wordpress.org/trunk@55853 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-site-health.php

@@ -2009,9 +2009,19 @@ class WP_Site_Health {
 			'test'        => 'update_temp_backup_writable',
 		);
 
-		if ( ! $wp_filesystem ) {
+		if ( ! function_exists( 'WP_Filesystem' ) ) {
 			require_once ABSPATH . '/wp-admin/includes/file.php';
-			WP_Filesystem();
+		}
+
+		ob_start();
+		$credentials = request_filesystem_credentials( '' );
+		ob_end_clean();
+
+		if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+			$result['status']      = 'recommended';
+			$result['label']       = __( 'Could not access filesystem' );
+			$result['description'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );
+			return $result;
 		}
 
 		$wp_content = $wp_filesystem->wp_content_dir();

wp-includes/update.php

@@ -1113,9 +1113,16 @@ function wp_delete_all_temp_backups() {
 function _wp_delete_all_temp_backups() {
 	global $wp_filesystem;
 
-	if ( ! $wp_filesystem ) {
+	if ( ! function_exists( 'WP_Filesystem' ) ) {
 		require_once ABSPATH . '/wp-admin/includes/file.php';
-		WP_Filesystem();
+	}
+
+	ob_start();
+	$credentials = request_filesystem_credentials( '' );
+	ob_end_clean();
+
+	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+		return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
 	}
 
 	if ( ! $wp_filesystem->wp_content_dir() ) {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56339';
+$wp_version = '6.4-alpha-56341';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.