$ git clone -n https://src.fedoraproject.org/rpms/R-DT.git /var/lib/mock/f39-build-1544666-36658/root/chroot_tmpdir/scmroot/R-DT
Cloning into '/var/lib/mock/f39-build-1544666-36658/root/chroot_tmpdir/scmroot/R-DT'...
$ git fetch origin 51e17b348b1bee69ff03a9c2864ee2a3acd96cda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-DT
 * [new ref]         51e17b348b1bee69ff03a9c2864ee2a3acd96cda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51e17b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild