Function ostree_sys::ostree_repo_add_gpg_signature_summary

pub unsafe extern "C" fn ostree_repo_add_gpg_signature_summary(
    self_: *mut OstreeRepo, 
    key_id: *mut *const c_char, 
    homedir: *const c_char, 
    cancellable: *mut GCancellable, 
    error: *mut *mut GError
) -> gboolean