sigs.k8s.io/cluster-api@v1.7.1/internal/controllers/machine/machine_helpers.go (about)

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package machine
    18  
    19  import (
    20  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    21  	"k8s.io/apimachinery/pkg/labels"
    22  )
    23  
    24  // HasMatchingLabels verifies that the Label Selector matches the given Labels.
    25  func HasMatchingLabels(matchSelector metav1.LabelSelector, matchLabels map[string]string) bool {
    26  	// This should never fail, validating webhook should catch this first
    27  	selector, err := metav1.LabelSelectorAsSelector(&matchSelector)
    28  	if err != nil {
    29  		return false
    30  	}
    31  	// If a nil or empty selector creeps in, it should match nothing, not everything.
    32  	if selector.Empty() {
    33  		return false
    34  	}
    35  	if !selector.Matches(labels.Set(matchLabels)) {
    36  		return false
    37  	}
    38  	return true
    39  }