$ git clone -n https://src.fedoraproject.org/rpms/R-webfakes.git /var/lib/mock/f40-build-2144946-50877/root/chroot_tmpdir/scmroot/R-webfakes
Cloning into '/var/lib/mock/f40-build-2144946-50877/root/chroot_tmpdir/scmroot/R-webfakes'...
$ git fetch origin 83efca49f373e156e8c8dee1f83dce330bf83a48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-webfakes
 * [new ref]         83efca49f373e156e8c8dee1f83dce330bf83a48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83efca4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild