$ git clone -n https://src.fedoraproject.org/rpms/hot-tux.git /var/lib/mock/f45-build-13458-451/root/chroot_tmpdir/scmroot/hot-tux
Cloning into '/var/lib/mock/f45-build-13458-451/root/chroot_tmpdir/scmroot/hot-tux'...
$ git fetch origin fe4336543cdf35677f29917bd5d294098fb37554:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hot-tux
 * [new ref]         fe4336543cdf35677f29917bd5d294098fb37554 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe43365 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild