$ git clone -n https://src.fedoraproject.org/rpms/vdr.git /var/lib/mock/f39-build-1581707-38093/root/chroot_tmpdir/scmroot/vdr
Cloning into '/var/lib/mock/f39-build-1581707-38093/root/chroot_tmpdir/scmroot/vdr'...
$ git fetch origin baef91de0aa6ee6c7aad2aa17fe2f698a9886ab2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr
 * [new ref]         baef91de0aa6ee6c7aad2aa17fe2f698a9886ab2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at baef91d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild