$ git clone -n https://src.fedoraproject.org/rpms/R-pbdZMQ.git /var/lib/mock/f45-build-6289-347/root/chroot_tmpdir/scmroot/R-pbdZMQ
Cloning into '/var/lib/mock/f45-build-6289-347/root/chroot_tmpdir/scmroot/R-pbdZMQ'...
$ git fetch origin feaa69270705bf5103b21d575913962c845d586c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pbdZMQ
 * [new ref]         feaa69270705bf5103b21d575913962c845d586c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at feaa692 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild