$ git clone -n https://src.fedoraproject.org/rpms/optee_os.git /var/lib/mock/f40-build-2282096-55519/root/chroot_tmpdir/scmroot/optee_os
Cloning into '/var/lib/mock/f40-build-2282096-55519/root/chroot_tmpdir/scmroot/optee_os'...
$ git fetch origin a205772c9e91c41aa5d700f96142cacfd6775721:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/optee_os
 * [new ref]         a205772c9e91c41aa5d700f96142cacfd6775721 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a205772 4.1.0