Function export_bare_clone 

async fn export_bare_clone(
    source: &Path,
    dest: &Path,
    default_branch: &str,
    include: &GlobSet,
    exclude: &GlobSet,
) -> Result<()>

Clone source as a bare repository at dest, then prune it down to the branches/tags allowed by git_ui.include/git_ui.exclude before enabling the dumb HTTP transport.

default_branch is used to pick a sane HEAD for the bare clone if the branch it previously pointed to got filtered out.