$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ruby_engine.git /var/lib/mock/f39-build-1462640-33353/root/chroot_tmpdir/scmroot/rubygem-ruby_engine
Cloning into '/var/lib/mock/f39-build-1462640-33353/root/chroot_tmpdir/scmroot/rubygem-ruby_engine'...
$ git fetch origin a5ae1e0124b7d46433cfe363261c6b90be6cc9c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ruby_engine
 * [new ref]         a5ae1e0124b7d46433cfe363261c6b90be6cc9c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5ae1e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild