$ git clone -n https://src.fedoraproject.org/rpms/tcllib.git /var/lib/mock/f41-build-side-1-2670544-29059/root/chroot_tmpdir/scmroot/tcllib
Cloning into '/var/lib/mock/f41-build-side-1-2670544-29059/root/chroot_tmpdir/scmroot/tcllib'...
$ git fetch origin a0962ac8e319144886ec5a598f674d082e784d3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcllib
 * [new ref]         a0962ac8e319144886ec5a598f674d082e784d3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0962ac convert license to SPDX