$ git clone -n https://src.fedoraproject.org/rpms/rust-atomic.git /var/lib/mock/f45-build-40302-770/root/chroot_tmpdir/scmroot/rust-atomic
Cloning into '/var/lib/mock/f45-build-40302-770/root/chroot_tmpdir/scmroot/rust-atomic'...
$ git fetch origin f78097bb81eef6efdd9e8fa7d87f3d0d8bc99180:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atomic
 * [new ref]         f78097bb81eef6efdd9e8fa7d87f3d0d8bc99180 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f78097b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild