$ git clone -n https://src.fedoraproject.org/rpms/rust-dunce.git /var/lib/mock/f45-build-41393-782/root/chroot_tmpdir/scmroot/rust-dunce
Cloning into '/var/lib/mock/f45-build-41393-782/root/chroot_tmpdir/scmroot/rust-dunce'...
$ git fetch origin ee5d794021ae64d30b121017656c100dc16ac59b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dunce
 * [new ref]         ee5d794021ae64d30b121017656c100dc16ac59b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee5d794 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild