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labels.go
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labels.go
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// Copyright 2020 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package labels
import (
"sigs.k8s.io/kustomize/api/filters/filtersutil"
"sigs.k8s.io/kustomize/api/filters/fsslice"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/kustomize/kyaml/kio"
"sigs.k8s.io/kustomize/kyaml/yaml"
)
type labelMap map[string]string
// Filter sets labels.
type Filter struct {
// Labels is the set of labels to apply to the inputs
Labels labelMap `yaml:"labels,omitempty"`
// FsSlice identifies the label fields.
FsSlice types.FsSlice
}
var _ kio.Filter = Filter{}
func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
keys := filtersutil.SortedMapKeys(f.Labels)
_, err := kio.FilterAll(yaml.FilterFunc(
func(node *yaml.RNode) (*yaml.RNode, error) {
for _, k := range keys {
if err := node.PipeE(fsslice.Filter{
FsSlice: f.FsSlice,
SetValue: fsslice.SetEntry(k, f.Labels[k]),
CreateKind: yaml.MappingNode, // Labels are MappingNodes.
}); err != nil {
return nil, err
}
}
return node, nil
})).Filter(nodes)
return nodes, err
}