Function pull_install_composefs_repository 

pub(crate) async fn pull_install_composefs_repository(
    state: &State,
    root_setup: &RootSetup,
    repo: &Arc<Repository<Sha512HashValue>>,
    use_unified: bool,
    fetch_imgref: Option<&ImageReference>,
) -> Result<PullResult<Sha512HashValue>>

Pull or import an install image into an initialized composefs repository.