$ git clone -n https://src.fedoraproject.org/rpms/R-vctrs.git /var/lib/mock/f40-build-2040935-48396/root/chroot_tmpdir/scmroot/R-vctrs
Cloning into '/var/lib/mock/f40-build-2040935-48396/root/chroot_tmpdir/scmroot/R-vctrs'...
$ git fetch origin e0d5a9a98adf954b0010aac9745f444ad4703e41:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-vctrs
 * [new ref]         e0d5a9a98adf954b0010aac9745f444ad4703e41 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0d5a9a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild