$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f41-build-1164897-21591/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f41-build-1164897-21591/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin 34c38e719f761bdd08f11d8e0056acb5f60cbe53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         34c38e719f761bdd08f11d8e0056acb5f60cbe53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34c38e7 3.23.0-3 - Add more upstream VALGRIND_3_23_BRANCH patches