$ git clone -n https://src.fedoraproject.org/rpms/tk.git /var/lib/mock/f41-build-725843-13123/root/chroot_tmpdir/scmroot/tk
Cloning into '/var/lib/mock/f41-build-725843-13123/root/chroot_tmpdir/scmroot/tk'...
$ git fetch origin 04414c90450a40ac536382c1bfd15fb569289864:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tk
 * [new ref]         04414c90450a40ac536382c1bfd15fb569289864 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04414c9 Fix flatpak build