optional: true
          env:
            - name: KUBERNETES_NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: CALICO_NETWORKING_BACKEND
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: calico_backend
          volumeMounts:

	allErrs := field.ErrorList{}

	if ev.ValueFrom == nil {
		return allErrs
	}

	numSources := 0

	if ev.ValueFrom.FieldRef != nil {
		numSources++
		allErrs = append(allErrs, validateObjectFieldSelector(ev.ValueFrom.FieldRef, &validEnvDownwardAPIFieldPathExpressions, fldPath.Child("fieldRef"))...)
		allErrs = append(allErrs, validateDownwardAPIHostIPs(ev.ValueFrom.FieldRef, fldPath.Child("fieldRef"), opts)...)
	}

}

func autoConvert_v1_EnvVar_To_core_EnvVar(in *v1.EnvVar, out *core.EnvVar, s conversion.Scope) error {
	out.Name = in.Name
	out.Value = in.Value
	out.ValueFrom = (*core.EnvVarSource)(unsafe.Pointer(in.ValueFrom))
	return nil
}

// Convert_v1_EnvVar_To_core_EnvVar is an autogenerated conversion function.

	Value string `json:"value,omitempty" protobuf:"bytes,2,opt,name=value"`
	// Source for the environment variable's value. Cannot be used if value is not empty.
	// +optional
	ValueFrom *EnvVarSource `json:"valueFrom,omitempty" protobuf:"bytes,3,opt,name=valueFrom"`
}

// EnvVarSource represents a source for the value of an EnvVar.
type EnvVarSource struct {

  // Defaults to "".
  // +optional
  optional string value = 2;

  // Source for the environment variable's value. Cannot be used if value is not empty.
  // +optional
  optional EnvVarSource valueFrom = 3;
}

// EnvVarSource represents a source for the value of an EnvVar.
message EnvVarSource {

	// regardless of whether the variable exists or not.
	// +optional
	Value string
	// Optional: Specifies a source the value of this var should come from.
	// +optional
	ValueFrom *EnvVarSource
}

// EnvVarSource represents a source for the value of an EnvVar.
// Only one of its fields may be set.
type EnvVarSource struct {

	"valueFrom": "Source for the environment variable's value. Cannot be used if value is not empty.",
}

func (EnvVar) SwaggerDoc() map[string]string {
	return map_EnvVar
}

var map_EnvVarSource = map[string]string{

  // Defaults to "".
  // +optional
  optional string value = 2;

  // Source for the environment variable's value. Cannot be used if value is not empty.
  // +optional
  optional EnvVarSource valueFrom = 3;
}

// EnvVarSource represents a source for the value of an EnvVar.
message EnvVarSource {

            "type": "string"
          },
          "valueFrom": {
            "allOf": [
              {
                "$ref": "#/components/schemas/io.k8s.api.core.v1.EnvVarSource"
              }
            ],