$ git clone -n https://src.fedoraproject.org/rpms/R-plyr.git /var/lib/mock/f38-build-724976-99532/root/chroot_tmpdir/scmroot/R-plyr
Cloning into '/var/lib/mock/f38-build-724976-99532/root/chroot_tmpdir/scmroot/R-plyr'...
$ git fetch origin 341b011fcc15814c6f6308bdc32c111ecd31eb77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-plyr
 * [new ref]         341b011fcc15814c6f6308bdc32c111ecd31eb77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 341b011 Update to latest version