$ git clone -n https://src.fedoraproject.org/rpms/R-rpm-macros.git /var/lib/mock/f40-build-2033163-47777/root/chroot_tmpdir/scmroot/R-rpm-macros
Cloning into '/var/lib/mock/f40-build-2033163-47777/root/chroot_tmpdir/scmroot/R-rpm-macros'...
$ git fetch origin a30a6f688edda52e352c07f74db180e77d8d93b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rpm-macros
 * [new ref]         a30a6f688edda52e352c07f74db180e77d8d93b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a30a6f6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild