$ git clone -n https://src.fedoraproject.org/rpms/rust-self_cell.git /var/lib/mock/f45-build-44755-816/root/chroot_tmpdir/scmroot/rust-self_cell
Cloning into '/var/lib/mock/f45-build-44755-816/root/chroot_tmpdir/scmroot/rust-self_cell'...
$ git fetch origin ff6427c4a053278c91faa4134aae2771cba02733:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-self_cell
 * [new ref]         ff6427c4a053278c91faa4134aae2771cba02733 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff6427c Drop no longer used license file copies and add back rust2rpm.toml