$ git clone -n https://src.fedoraproject.org/rpms/heimdal.git /var/lib/mock/f40-build-792922-138676/root/chroot_tmpdir/scmroot/heimdal
Cloning into '/var/lib/mock/f40-build-792922-138676/root/chroot_tmpdir/scmroot/heimdal'...
$ git fetch origin b8b4396f077108da52b8688208ca3242dbf8769e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/heimdal
 * [new ref]         b8b4396f077108da52b8688208ca3242dbf8769e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8b4396 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild