$ git clone -n https://src.fedoraproject.org/rpms/lua-bit32.git /var/lib/mock/f45-build-17610-501/root/chroot_tmpdir/scmroot/lua-bit32
Cloning into '/var/lib/mock/f45-build-17610-501/root/chroot_tmpdir/scmroot/lua-bit32'...
$ git fetch origin bbdcd3e901de028ae46db101b621c8f888242231:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-bit32
 * [new ref]         bbdcd3e901de028ae46db101b621c8f888242231 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbdcd3e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild