$ git clone -n https://src.fedoraproject.org/rpms/R-diffobj.git /var/lib/mock/f40-build-789553-135900/root/chroot_tmpdir/scmroot/R-diffobj
Cloning into '/var/lib/mock/f40-build-789553-135900/root/chroot_tmpdir/scmroot/R-diffobj'...
$ git fetch origin 37ab1b1921bb538f1a053e3859897b971560441a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-diffobj
 * [new ref]         37ab1b1921bb538f1a053e3859897b971560441a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ab1b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild