$ git clone -n https://src.fedoraproject.org/rpms/R-evaluate.git /var/lib/mock/f45-build-6216-347/root/chroot_tmpdir/scmroot/R-evaluate
Cloning into '/var/lib/mock/f45-build-6216-347/root/chroot_tmpdir/scmroot/R-evaluate'...
$ git fetch origin 19dfbf9c96b82ec4a6d79ef51863f9e6847b8ae3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-evaluate
 * [new ref]         19dfbf9c96b82ec4a6d79ef51863f9e6847b8ae3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19dfbf9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild