$ git clone -n https://src.fedoraproject.org/rpms/powerdevil.git /var/lib/mock/f42-build-side-1-3578441-46814/root/chroot_tmpdir/scmroot/powerdevil
Cloning into '/var/lib/mock/f42-build-side-1-3578441-46814/root/chroot_tmpdir/scmroot/powerdevil'...
$ git fetch origin 3cea97ca3a0ec05cd9752571bf76816050276d47:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/powerdevil
 * [new ref]         3cea97ca3a0ec05cd9752571bf76816050276d47 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3cea97c 6.4.1