$ git clone -n https://src.fedoraproject.org/rpms/R-vcd.git /var/lib/mock/f41-build-side-1-3049093-37873/root/chroot_tmpdir/scmroot/R-vcd
Cloning into '/var/lib/mock/f41-build-side-1-3049093-37873/root/chroot_tmpdir/scmroot/R-vcd'...
$ git fetch origin 9f0e35df917f7c234674dc77a5edc7cddcb9d959:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-vcd
 * [new ref]         9f0e35df917f7c234674dc77a5edc7cddcb9d959 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f0e35d Update to 1.4.13