$ git clone -n https://src.fedoraproject.org/rpms/mythes.git /var/lib/mock/f40-build-2012270-45780/root/chroot_tmpdir/scmroot/mythes
Cloning into '/var/lib/mock/f40-build-2012270-45780/root/chroot_tmpdir/scmroot/mythes'...
$ git fetch origin b2f55e9e48ba600000077493562f6eea4b301c3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mythes
 * [new ref]         b2f55e9e48ba600000077493562f6eea4b301c3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2f55e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild