$ git clone -n https://src.fedoraproject.org/rpms/rust-btoi.git /var/lib/mock/f38-build-side-43-rust-devel-1411728-31436/root/chroot_tmpdir/scmroot/rust-btoi
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411728-31436/root/chroot_tmpdir/scmroot/rust-btoi'...
$ git fetch origin c98461d1d8a7b74bf4a8a8b3538b181f14cb7c7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-btoi
 * [new ref]         c98461d1d8a7b74bf4a8a8b3538b181f14cb7c7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c98461d Initial package