WP_Upgrader::unpack_package( string $package, bool $delete_package = true ): string|WP_Error

Source

public function unpack_package( $package, $delete_package = true ) {
	global $wp_filesystem;

	$this->skin->feedback( 'unpack_package' );

	if ( ! $wp_filesystem->wp_content_dir() ) {
		return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
	}

	$upgrade_folder = $wp_filesystem->wp_content_dir() . 'upgrade/';

	// Clean up contents of upgrade directory beforehand.
	$upgrade_files = $wp_filesystem->dirlist( $upgrade_folder );
	if ( ! empty( $upgrade_files ) ) {
		foreach ( $upgrade_files as $file ) {
			$wp_filesystem->delete( $upgrade_folder . $file['name'], true );
		}
	}

	// We need a working directory - strip off any .tmp or .zip suffixes.
	$working_dir = $upgrade_folder . basename( basename( $package, '.tmp' ), '.zip' );

	// Clean up working directory.
	if ( $wp_filesystem->is_dir( $working_dir ) ) {
		$wp_filesystem->delete( $working_dir, true );
	}

	// Unzip package to working directory.
	$result = unzip_file( $package, $working_dir );

	// Once extracted, delete the package if required.
	if ( $delete_package ) {
		unlink( $package );
	}

	if ( is_wp_error( $result ) ) {
		$wp_filesystem->delete( $working_dir, true );
		if ( 'incompatible_archive' === $result->get_error_code() ) {
			return new WP_Error( 'incompatible_archive', $this->strings['incompatible_archive'], $result->get_error_data() );
		}
		return $result;
	}

	return $working_dir;
}

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