$ git clone -n https://src.fedoraproject.org/rpms/powerdevil.git /var/lib/mock/f42-build-side-1-3566314-46733/root/chroot_tmpdir/scmroot/powerdevil
Cloning into '/var/lib/mock/f42-build-side-1-3566314-46733/root/chroot_tmpdir/scmroot/powerdevil'...
$ git fetch origin 3aa1cb4306d8daf85ac4333e4365a26284fe3d3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/powerdevil
 * [new ref]         3aa1cb4306d8daf85ac4333e4365a26284fe3d3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3aa1cb4 6.4.0