$ git clone -n https://src.fedoraproject.org/rpms/R-git2r.git /var/lib/mock/f40-build-789463-135730/root/chroot_tmpdir/scmroot/R-git2r
Cloning into '/var/lib/mock/f40-build-789463-135730/root/chroot_tmpdir/scmroot/R-git2r'...
$ git fetch origin 5dbd676ba82c6195d07eacd7edbcc77aae583125:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-git2r
 * [new ref]         5dbd676ba82c6195d07eacd7edbcc77aae583125 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5dbd676 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild