$ git clone -n https://src.fedoraproject.org/rpms/rubygem-spring.git /var/lib/mock/f40-build-2639364-66353/root/chroot_tmpdir/scmroot/rubygem-spring
Cloning into '/var/lib/mock/f40-build-2639364-66353/root/chroot_tmpdir/scmroot/rubygem-spring'...
$ git fetch origin 83c95f7517b8d55728e1130f9821212b8b949178:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-spring
 * [new ref]         83c95f7517b8d55728e1130f9821212b8b949178 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83c95f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild