$ git clone -n https://src.fedoraproject.org/rpms/R-jquerylib.git /var/lib/mock/f45-build-6217-347/root/chroot_tmpdir/scmroot/R-jquerylib
Cloning into '/var/lib/mock/f45-build-6217-347/root/chroot_tmpdir/scmroot/R-jquerylib'...
$ git fetch origin 924eff505af03d9c9040680260a95cbf9d30aaf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-jquerylib
 * [new ref]         924eff505af03d9c9040680260a95cbf9d30aaf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 924eff5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild