$ git clone -n https://src.fedoraproject.org/rpms/tclx.git /var/lib/mock/f41-build-1041910-18994/root/chroot_tmpdir/scmroot/tclx
Cloning into '/var/lib/mock/f41-build-1041910-18994/root/chroot_tmpdir/scmroot/tclx'...
$ git fetch origin 407d53719a638ca8b4f5d943e5898d27d92a6890:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tclx
 * [new ref]         407d53719a638ca8b4f5d943e5898d27d92a6890 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 407d537 Eliminate use of obsolete %patchN syntax (#2283636)