$ git clone -n https://src.fedoraproject.org/rpms/R-repr.git /var/lib/mock/f40-build-2189628-51418/root/chroot_tmpdir/scmroot/R-repr
Cloning into '/var/lib/mock/f40-build-2189628-51418/root/chroot_tmpdir/scmroot/R-repr'...
$ git fetch origin c8bdeeb8670d2a5c78bcd71b278cbeac37143945:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-repr
 * [new ref]         c8bdeeb8670d2a5c78bcd71b278cbeac37143945 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8bdeeb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild