$ git clone -n https://src.fedoraproject.org/rpms/R-gtools.git /var/lib/mock/f45-build-6148-346/root/chroot_tmpdir/scmroot/R-gtools
Cloning into '/var/lib/mock/f45-build-6148-346/root/chroot_tmpdir/scmroot/R-gtools'...
$ git fetch origin 94403b6dd4abe1f609d265e220cc2db98d40410b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gtools
 * [new ref]         94403b6dd4abe1f609d265e220cc2db98d40410b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94403b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild