$ git clone -n https://src.fedoraproject.org/rpms/R-later.git /var/lib/mock/f40-build-2229834-53179/root/chroot_tmpdir/scmroot/R-later
Cloning into '/var/lib/mock/f40-build-2229834-53179/root/chroot_tmpdir/scmroot/R-later'...
$ git fetch origin 17539e9115fdf9a1aece1d8297f64939d795d2b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-later
 * [new ref]         17539e9115fdf9a1aece1d8297f64939d795d2b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17539e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild