$ git clone -n https://src.fedoraproject.org/rpms/R-labeling.git /var/lib/mock/f45-build-6214-347/root/chroot_tmpdir/scmroot/R-labeling
Cloning into '/var/lib/mock/f45-build-6214-347/root/chroot_tmpdir/scmroot/R-labeling'...
$ git fetch origin 8b853642455e7c6d8bddd035436c39d27dfe0206:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-labeling
 * [new ref]         8b853642455e7c6d8bddd035436c39d27dfe0206 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b85364 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild