$ git clone -n https://src.fedoraproject.org/rpms/rpkg-macros.git /var/lib/mock/f40-build-2321928-58616/root/chroot_tmpdir/scmroot/rpkg-macros
Cloning into '/var/lib/mock/f40-build-2321928-58616/root/chroot_tmpdir/scmroot/rpkg-macros'...
$ git fetch origin 89d43bbb809814df2f31f947a0a915a362dfe450:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpkg-macros
 * [new ref]         89d43bbb809814df2f31f947a0a915a362dfe450 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89d43bb Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild