$ git clone -n https://src.fedoraproject.org/rpms/rust-bitvec.git /var/lib/mock/f38-build-side-43-rust-devel-1417048-31458/root/chroot_tmpdir/scmroot/rust-bitvec
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417048-31458/root/chroot_tmpdir/scmroot/rust-bitvec'...
$ git fetch origin 710a3631894dcce5a1b4bf095ea63d76719a0d8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitvec
 * [new ref]         710a3631894dcce5a1b4bf095ea63d76719a0d8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 710a363 Update to version 1.0.1; Fixes RHBZ#1928441