$ git clone -n https://src.fedoraproject.org/rpms/R-clipr.git /var/lib/mock/f45-build-6006-345/root/chroot_tmpdir/scmroot/R-clipr
Cloning into '/var/lib/mock/f45-build-6006-345/root/chroot_tmpdir/scmroot/R-clipr'...
$ git fetch origin 83143512dbb646239421b40461b03ac8672b867b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-clipr
 * [new ref]         83143512dbb646239421b40461b03ac8672b867b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8314351 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild