$ git clone -n https://src.fedoraproject.org/rpms/R-DT.git /var/lib/mock/f40-build-2321311-58564/root/chroot_tmpdir/scmroot/R-DT
Cloning into '/var/lib/mock/f40-build-2321311-58564/root/chroot_tmpdir/scmroot/R-DT'...
$ git fetch origin dffd8ddb6f34b1225b138e4446842caa70e8d631:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-DT
 * [new ref]         dffd8ddb6f34b1225b138e4446842caa70e8d631 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dffd8dd Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild