$ git clone -n https://src.fedoraproject.org/rpms/R-DT.git /var/lib/mock/f42-build-3264335-41244/root/chroot_tmpdir/scmroot/R-DT
Cloning into '/var/lib/mock/f42-build-3264335-41244/root/chroot_tmpdir/scmroot/R-DT'...
$ git fetch origin 21fb3c5a27b4296b16cfd821194540c96aa87363:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-DT
 * [new ref]         21fb3c5a27b4296b16cfd821194540c96aa87363 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21fb3c5 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild