Function refs 

pub fn refs<P, W>(
    protocol: Option<Protocol>,
    url: &str,
    refs_directory: Option<PathBuf>,
    progress: P,
    ctx: Context<W>,
) -> Result<()>
where
    W: Write,
    P: NestedProgress + 'static,
    P::SubProgress: 'static,

Available on crate feature blocking-client only.