$ git clone -n https://src.fedoraproject.org/rpms/R-polyclip.git /var/lib/mock/f45-build-6317-347/root/chroot_tmpdir/scmroot/R-polyclip
Cloning into '/var/lib/mock/f45-build-6317-347/root/chroot_tmpdir/scmroot/R-polyclip'...
$ git fetch origin f7a4ed54927c7a6009321f71b3bf0a9f035fc877:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-polyclip
 * [new ref]         f7a4ed54927c7a6009321f71b3bf0a9f035fc877 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7a4ed5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild