$ git clone -n https://src.fedoraproject.org/rpms/optee_client.git /var/lib/mock/f42-build-3367125-45050/root/chroot_tmpdir/scmroot/optee_client
Cloning into '/var/lib/mock/f42-build-3367125-45050/root/chroot_tmpdir/scmroot/optee_client'...
$ git fetch origin 14f655bf1deb0cff5f98e22649752b09b19ce5e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/optee_client
 * [new ref]         14f655bf1deb0cff5f98e22649752b09b19ce5e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14f655b 4.5.0