$ git clone -n https://src.fedoraproject.org/rpms/rust-num_threads.git /var/lib/mock/f45-build-43496-803/root/chroot_tmpdir/scmroot/rust-num_threads
Cloning into '/var/lib/mock/f45-build-43496-803/root/chroot_tmpdir/scmroot/rust-num_threads'...
$ git fetch origin 3520a65c013c6561eca34a9496b61a55a54054cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num_threads
 * [new ref]         3520a65c013c6561eca34a9496b61a55a54054cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3520a65 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild