$ git clone -n https://src.fedoraproject.org/rpms/R-lokern.git /var/lib/mock/f40-build-2270129-54793/root/chroot_tmpdir/scmroot/R-lokern
Cloning into '/var/lib/mock/f40-build-2270129-54793/root/chroot_tmpdir/scmroot/R-lokern'...
$ git fetch origin 531a95b07a62a066c16cb3c264266d5dc10a6c7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lokern
 * [new ref]         531a95b07a62a066c16cb3c264266d5dc10a6c7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 531a95b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild