WP_REST_Plugins_Controller::is_filesystem_available(): true|WP_Error

Source

protected function is_filesystem_available() {
	$filesystem_method = get_filesystem_method();

	if ( 'direct' === $filesystem_method ) {
		return true;
	}

	ob_start();
	$filesystem_credentials_are_stored = request_filesystem_credentials( self_admin_url() );
	ob_end_clean();

	if ( $filesystem_credentials_are_stored ) {
		return true;
	}

	return new WP_Error( 'fs_unavailable', __( 'The filesystem is currently unavailable for managing plugins.' ), array( 'status' => 500 ) );
}

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