You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dispatchers.go
    path of file: ./repos/sealer/vendor/github.com/openshift/imagebuilder
    
    the code of the file until where you have to start completion: package imagebuilder

// This file contains the dispatchers for each command. Note that
// `nullDispatch` is not actually a command, but support for commands we parse
// but d
    
func workdir(b *Builder, args []string, attributes map[string]bool, flagArgs []string, original string) error {
	if len(args) != 1 {
		return errExactlyOneArgument("WORKDIR")
	}

	// This is from the Dockerfile and will not necessarily be in platform
	// specific semantics, hence ensure it is converted.
	workdir := filepath.FromSlash(args[0])

	if !filepath.IsAbs(workdir) {
		current := filepath.FromSlash(b.RunConfig.WorkingDir)
		workdir = filepath.Join(string(os.PathSeparator), current, workdir)
	}

	b.RunConfig.WorkingDir = workdir
	return nil
}