$ git clone -n https://src.fedoraproject.org/rpms/R-pbdZMQ.git /var/lib/mock/f41-build-1111508-20153/root/chroot_tmpdir/scmroot/R-pbdZMQ
Cloning into '/var/lib/mock/f41-build-1111508-20153/root/chroot_tmpdir/scmroot/R-pbdZMQ'...
$ git fetch origin fddccd1ba60468a5e35579337f86763a49f35d1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pbdZMQ
 * [new ref]         fddccd1ba60468a5e35579337f86763a49f35d1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fddccd1 Eliminate use of obsolete %patchN syntax (#2283636)