$ git clone -n https://src.fedoraproject.org/rpms/plplot.git /var/lib/mock/f42-build-865409-173104/root/chroot_tmpdir/scmroot/plplot
Cloning into '/var/lib/mock/f42-build-865409-173104/root/chroot_tmpdir/scmroot/plplot'...
$ git fetch origin 6cad7b709d23f2b4d5ad7d88ec5eb3d60ed54f81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plplot
 * [new ref]         6cad7b709d23f2b4d5ad7d88ec5eb3d60ed54f81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cad7b7 Rebuild for octave 9.2