$ git clone -n https://src.fedoraproject.org/rpms/cgreen.git /var/lib/mock/f40-build-1992490-43603/root/chroot_tmpdir/scmroot/cgreen
Cloning into '/var/lib/mock/f40-build-1992490-43603/root/chroot_tmpdir/scmroot/cgreen'...
$ git fetch origin 698e02d4aca9f11a921a65c7fd10ee64287ed854:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cgreen
 * [new ref]         698e02d4aca9f11a921a65c7fd10ee64287ed854 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 698e02d Update to 1.6.2