$ git clone -n https://src.fedoraproject.org/rpms/optee_os.git /var/lib/mock/f42-build-3494608-45873/root/chroot_tmpdir/scmroot/optee_os
Cloning into '/var/lib/mock/f42-build-3494608-45873/root/chroot_tmpdir/scmroot/optee_os'...
$ git fetch origin f90fbc6c1e19432d8017dcecb45966fa2cb990dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/optee_os
 * [new ref]         f90fbc6c1e19432d8017dcecb45966fa2cb990dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f90fbc6 Enable Xilinx ZYNQMP and Versal platforms