$ git clone -n https://src.fedoraproject.org/rpms/ongres-stringprep.git /var/lib/mock/f40-build-2013751-45919/root/chroot_tmpdir/scmroot/ongres-stringprep
Cloning into '/var/lib/mock/f40-build-2013751-45919/root/chroot_tmpdir/scmroot/ongres-stringprep'...
$ git fetch origin d876c0e35a7042b15bdfbbd77de8e004e391ff6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ongres-stringprep
 * [new ref]         d876c0e35a7042b15bdfbbd77de8e004e391ff6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d876c0e Drop codegenerator from install