text: """
  All the functions to properly build the object hierarchies.
  """
  import collections.abc
  import warnings
  from typing import Any, Iterable, Iterator, Mapping, MutableMapping, Optional, Union, cast
  
  from kopf.reactor import causation, handling
  from kopf.structs import bodies, dicts
  from kopf.utilities import thirdparty
  
  K8sObject = Union[MutableMapping[Any, Any], thirdparty.PykubeObject, thirdparty.KubernetesModel]
  K8sObjects = Union[K8sObject, Iterable[K8sObject]]
  
  
  def append_owner_reference(
          objs: K8sObjects,
          owner: Optional[bodies.Body] = None,
  ) -> None:
      """
      Append an owner reference to the resource(s), if it is not yet there.
  
      Note: the owned objects are usually not the one being processed,
      so the whole body can be modified, no patches are needed.
      """
      real_owner = _guess_owner(owner)
      owner_ref = bodies.build_owner_reference(real_owner)
      for obj in cast(Iterator[K8sObject], dicts.walk(objs)):
          # Pykube is yielded as a usual dict, no need to specially treat it.
          if isinstance(obj, collections.abc.MutableMapping):
              refs = obj.setdefault('metadata', {}).setdefault('ownerReferences', [])
              if not any(ref.get('uid') == owner_ref['uid'] for ref in refs):
                  refs.append(owner_ref)
          elif isinstance(obj, thirdparty.KubernetesModel):
              if obj.metadata is None:
                  obj.metadata = thirdparty.V1ObjectMeta()
              if obj.metadata.owner_references is None:
                  obj.metadata.owner_references = []
              refs = obj.metadata.owner_references
              if not any(ref.uid == owner_ref['uid'] for ref in refs):
                  refs.append(thirdparty.V1OwnerReference(
                      api_version=owner_ref['apiVersion'],
                      kind=owner_ref['kind'],
                      name=owner_ref['name'],
                      uid=owner_ref['uid'],
                      controller=owner_ref['controller'],
                      block_owner_deletion=owner_ref['blockOwnerDeletion'],
                  ))
          else:
              raise TypeError(f"K8s object class is not supported: {type(obj)}")
  
  
  def remove_owner_reference(
          objs: K8sObjects,
          owner: Optional[bodies.Body] = None,
  ) -> None:
      """
      Remove an owner reference to the resource(s), if it is there.
  
      Note: the owned objects are usually not the one being processed,
      so the whole body can be modified, no patches are needed.
      """
      real_owner = _guess_owner(owner)
      owner_ref = bodies.build_owner_reference(real_owner)
      for obj in cast(Iterator[K8sObject], dicts.walk(objs)):
          # Pykube is yielded as a usual dict, no need to specially treat it.
          if isinstance(obj, collections.abc.MutableMapping):
              refs = obj.setdefault('metadata', {}).setdefault('ownerReferences', [])
              if any(ref.get('uid') == owner_ref['uid'] for ref in refs):
                  refs[:] = [ref for ref in refs if ref.get('uid') != owner_ref['uid']]
          elif isinstance(obj, thirdparty.KubernetesModel):
              if obj.metadata is None:
                  obj.metadata = thirdparty.V1ObjectMeta()
              if obj.metadata.owner_references is None:
                  obj.metadata.owner_references = []
              refs = obj.metadata.owner_references
              if any(ref.uid == owner_ref['uid'] for ref in refs):
                  refs[:] = [ref for ref in refs if ref.uid != owner_ref['uid']]
          else:
              raise TypeError(f"K8s object class is not supported: {type(obj)}")
  
  
  def label(
          objs: K8sObjects,
          labels: Optional[Mapping[str, Union[None, str]]] = None,
          *,
          forced: bool = False,
          nested: Optional[Union[str, Iterable[dicts.FieldSpec]]] = None,
          force: Optional[bool] = None,  # deprecated
  ) -> None:
      """
      Apply the labels to the object(s).
      """
      nested = [nested] if isinstance(nested, str) else nested
      if force is not None:
          warnings.warn("force= is deprecated in kopf.label(); use forced=...", DeprecationWarning)
          forced = force
  
      # Try to use the current object being handled if possible.
      if labels is None:
          real_owner = _guess_owner(None)
          labels = real_owner.get('metadata', {}).get('labels', {})
  
      # Set labels based on the explicitly specified or guessed ones.
      for obj in cast(Iterator[K8sObject], dicts.walk(objs, nested=nested)):
          # Pykube is yielded as a usual dict, no need to specially treat it.
          if isinstance(obj, collections.abc.MutableMapping):
              obj_labels = obj.setdefault('metadata', {}).setdefault('labels', {})
          elif isinstance(obj, thirdparty.KubernetesModel):
              if obj.metadata is None:
                  obj.metadata = thirdparty.V1ObjectMeta()
              if obj.metadata.labels is None:
                  obj.metadata.labels = {}
              obj_labels = obj.metadata.labels
          else:
              raise TypeError(f"K8s object class is not supported: {type(obj)}")
  
          for key, val in labels.items():
              if forced:
                  obj_labels[key] = val
              else:
                  obj_labels.setdefault(key, val)
  
  
  def harmonize_naming(
          objs: K8sObjects,
          name: Optional[str] = None,
          *,
          forced: bool = False,
          strict: bool = False,
  ) -> None:
      """
      Adjust the names or prefixes of the objects.
  
      In strict mode, the provided name is used as is. It can be helpful
      if the object is referred by that name in other objects.
  
      In non-strict mode (the default), the object uses the provided name
      as a prefix, while the suffix is added by Kubernetes remotely.
      The actual name should be taken from Kubernetes response
      (this is the recommended scenario).
  
      If the objects already have their own names, auto-naming is not applied,
      and the existing names are used as is.
      """
  
      # Try to use the current object being handled if possible.
      if name is None:
          real_owner = _guess_owner(None)
          name = real_owner.get('metadata', {}).get('name', None)
      if name is None:
          raise LookupError("Name must be set explicitly: couldn't find it automatically.")
  
      # Set name/prefix based on the explicitly specified or guessed name.
      for obj in cast(Iterator[K8sObject], dicts.walk(objs)):
          # Pykube is yielded as a usual dict, no need to specially treat it.
          if isinstance(obj, collections.abc.MutableMapping):
              noname = 'metadata' not in obj or not set(obj['metadata']) & {'name', 'generateName'}
              if forced or noname:
                  if strict:
                      obj.setdefault('metadata', {})['name'] = name
                      if 'generateName' in obj['metadata']:
                          del obj['metadata']['generateName']
                  else:
                      obj.setdefault('metadata', {})['generateName'] = f'{name}-'
                      if 'name' in obj['metadata']:
                          del obj['metadata']['name']
          elif isinstance(obj, thirdparty.KubernetesModel):
              if obj.metadata is None:
                  obj.metadata = thirdparty.V1ObjectMeta()
              noname = obj.metadata.name is None and obj.metadata.generate_name is None
              if forced or noname:
                  if strict:
                      obj.metadata.name = name
                      if obj.metadata.generate_name is not None:
                          obj.metadata.generate_name = None
                  else:
                      obj.metadata.generate_name = f'{name}-'
                      if obj.metadata.name is not None:
                          obj.metadata.name = None
          else:
              raise TypeError(f"K8s object class is not supported: {type(obj)}")
  
  
  def adjust_namespace(
          objs: K8sObjects,
          namespace: Optional[str] = None,
          *,
          forced: bool = False,
  ) -> None:
      """
      Adjust the namespace of the objects.
  
      If the objects already have the namespace set, it will be preserved.
  
      It is a common practice to keep the children objects in the same
      namespace as their owner, unless explicitly overridden at time of creation.
      """
  
      # Try to use the current object being handled if possible.
      if namespace is None:
          real_owner = _guess_owner(None)
          namespace = real_owner.get('metadata', {}).get('namespace', None)
      if namespace is None:
          raise LookupError("Namespace must be set explicitly: couldn't find it automatically.")
  
      # Set namespace based on the explicitly specified or guessed namespace.
      for obj in cast(Iterator[K8sObject], dicts.walk(objs)):
          # Pykube is yielded as a usual dict, no need to specially treat it.
          if isinstance(obj, collections.abc.MutableMapping):
              if forced or obj.get('metadata', {}).get('namespace') is None:
                  obj.setdefault('metadata', {})['namespace'] = namespace
          elif isinstance(obj, thirdparty.KubernetesModel):
              if obj.metadata is None:
                  obj.metadata = thirdparty.V1ObjectMeta()
              if forced or obj.metadata.namespace is None:
                  obj.metadata.namespace = namespace
          else:
              raise TypeError(f"K8s object class is not supported: {type(obj)}")
  
  
  def adopt(
          objs: K8sObjects,
          owner: Optional[bodies.Body] = None,
          *,
          forced: bool = False,
          strict: bool = False,
          nested: Optional[Union[str, Iterable[dicts.FieldSpec]]] = None,
  ) -> None:
      """
      The children should be in the same namespace, named after their parent, and owned by it.
      """
      real_owner = _guess_owner(owner)
      real_owner_name = real_owner.get('metadata', {}).get('name', None)
      real_owner_namespace = real_owner.get('metadata', {}).get('namespace', None)
      real_owner_labels = real_owner.get('metadata', {}).get('labels', {})
      append_owner_reference(objs, owner=real_owner)
      harmonize_naming(objs, forced=forced, strict=strict, name=real_owner_name)
      adjust_namespace(objs, forced=forced, namespace=real_owner_namespace)
      label(objs, forced=forced, nested=nested, labels=real_owner_labels)
  
  
  def _guess_owner(
          owner: Optional[bodies.Body],
  ) -> bodies.Body:
      if owner is not None:
          return owner
  
      try:
          cause = handling.cause_var.get()
      except LookupError:
          pass
      else:
          if cause is not None and isinstance(cause, causation.ResourceCause):
              return cause.body
  
      raise LookupError("Owner must be set explicitly, since running outside of a handler.")
  