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: repo.go
    path of file: ./repos/glide/vendor/github.com/Masterminds/vcs
    
    the code of the file until where you have to start completion: // Package vcs provides the ability to work with varying version control systems
// (VCS),  also known as source control systems (SCM
    
func (b base) run(cmd string, args ...string) ([]byte, error) {
	out, err := exec.Command(cmd, args...).CombinedOutput()
	b.log(out)
	if err != nil {
		err = fmt.Errorf("%s: %s", out, err)
	}
	return out, err
}