$ git clone -n https://src.fedoraproject.org/rpms/optee_client.git /var/lib/mock/f40-build-762458-122044/root/chroot_tmpdir/scmroot/optee_client
Cloning into '/var/lib/mock/f40-build-762458-122044/root/chroot_tmpdir/scmroot/optee_client'...
$ git fetch origin 47c1dffb0c96e4f435f272580d39ba35ced7aad7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/optee_client
 * [new ref]         47c1dffb0c96e4f435f272580d39ba35ced7aad7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47c1dff add libteec.pc