$ git clone -n https://src.fedoraproject.org/rpms/R-RUnit.git /var/lib/mock/f40-build-2270409-54814/root/chroot_tmpdir/scmroot/R-RUnit
Cloning into '/var/lib/mock/f40-build-2270409-54814/root/chroot_tmpdir/scmroot/R-RUnit'...
$ git fetch origin 5f0a017b79396e6157a3916815ea8268f909de0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RUnit
 * [new ref]         5f0a017b79396e6157a3916815ea8268f909de0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f0a017 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild