$ git clone -n https://src.fedoraproject.org/rpms/utox.git /var/lib/mock/f40-build-796538-140694/root/chroot_tmpdir/scmroot/utox
Cloning into '/var/lib/mock/f40-build-796538-140694/root/chroot_tmpdir/scmroot/utox'...
$ git fetch origin 4899760195cdb031639d57d9bbc3a970553bbf74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/utox
 * [new ref]         4899760195cdb031639d57d9bbc3a970553bbf74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4899760 Rebuild for libvpx 1.14.x