$ git clone -n https://src.fedoraproject.org/rpms/R-withr.git /var/lib/mock/f40-build-2270259-54800/root/chroot_tmpdir/scmroot/R-withr
Cloning into '/var/lib/mock/f40-build-2270259-54800/root/chroot_tmpdir/scmroot/R-withr'...
$ git fetch origin 86d2e58c2e64c15bab748737be3c57f8b8313d14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-withr
 * [new ref]         86d2e58c2e64c15bab748737be3c57f8b8313d14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86d2e58 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild