$ git clone -n https://src.fedoraproject.org/rpms/R-microbenchmark.git /var/lib/mock/f45-build-6233-347/root/chroot_tmpdir/scmroot/R-microbenchmark
Cloning into '/var/lib/mock/f45-build-6233-347/root/chroot_tmpdir/scmroot/R-microbenchmark'...
$ git fetch origin 313a13f18b55f9421c7d58ebdf50a432efaa5008:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-microbenchmark
 * [new ref]         313a13f18b55f9421c7d58ebdf50a432efaa5008 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 313a13f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild