// AddLabelToSelector returns a selector with the given key and value added to the given selector's MatchLabels.
func AddLabelToSelector(selector *metav1.LabelSelector, labelKey, labelValue string) *metav1.LabelSelector {
if labelKey == "" {
// Don't need to add a label.
return selector
}
if selector.MatchLabels == nil {
selector.MatchLabels = make(map[string]string)
}
selector.MatchLabels[labelKey] = labelValue
return selector
}
// Clones the given selector and returns a new selector with the given key and value added.
// Returns the given selector, if labelKey is empty.
func CloneSelectorAndAddLabel(selector *metav1.LabelSelector, labelKey, labelValue string) *metav1.LabelSelector {
if labelKey == "" {
// Don't need to add a label.
return selector
}
// Clone.
newSelector := new(metav1.LabelSelector)
// TODO(madhusudancs): Check if you can use deepCopy_extensions_LabelSelector here.
newSelector.MatchLabels = make(map[string]string)
if selector.MatchLabels != nil {
for key, val := range selector.MatchLabels {
newSelector.MatchLabels[key] = val
}
}
newSelector.MatchLabels[labelKey] = labelValue
if selector.MatchExpressions != nil {
newMExps := make([]metav1.LabelSelectorRequirement, len(selector.MatchExpressions))
for i, me := range selector.MatchExpressions {
newMExps[i].Key = me.Key
newMExps[i].Operator = me.Operator
if me.Values != nil {
newMExps[i].Values = make([]string, len(me.Values))
copy(newMExps[i].Values, me.Values)
} else {
newMExps[i].Values = nil
}
}
newSelector.MatchExpressions = newMExps
} else {
newSelector.MatchExpressions = nil
}
return newSelector
}