$ git clone -n https://src.fedoraproject.org/rpms/R-fs.git /var/lib/mock/f40-build-2032397-47692/root/chroot_tmpdir/scmroot/R-fs
Cloning into '/var/lib/mock/f40-build-2032397-47692/root/chroot_tmpdir/scmroot/R-fs'...
$ git fetch origin 66ba30facadb1549d9c4c7b268877d2341c560ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-fs
 * [new ref]         66ba30facadb1549d9c4c7b268877d2341c560ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66ba30f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild