$ git clone -n https://src.fedoraproject.org/rpms/device-mapper-persistent-data.git /var/lib/mock/f40-build-2639746-66380/root/chroot_tmpdir/scmroot/device-mapper-persistent-data
Cloning into '/var/lib/mock/f40-build-2639746-66380/root/chroot_tmpdir/scmroot/device-mapper-persistent-data'...
$ git fetch origin e10017f3760eaedd0f9db0eb85e5498d269fe608:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/device-mapper-persistent-data
 * [new ref]         e10017f3760eaedd0f9db0eb85e5498d269fe608 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e10017f Update to version 1.0.12