$ git clone -n https://src.fedoraproject.org/rpms/xfce4-clipman-plugin.git /var/lib/mock/f39-build-1519789-35821/root/chroot_tmpdir/scmroot/xfce4-clipman-plugin
Cloning into '/var/lib/mock/f39-build-1519789-35821/root/chroot_tmpdir/scmroot/xfce4-clipman-plugin'...
$ git fetch origin c5aa31002271a799f774e85bfb2f0b68a6257c34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-clipman-plugin
 * [new ref]         c5aa31002271a799f774e85bfb2f0b68a6257c34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5aa310 update to v1.6.4