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imagetag.go
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imagetag.go
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// Copyright 2020 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package imagetag
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"
)
// Filter modifies an "image tag", the value used to specify the
// name, tag, version digest etc. of (docker) container images
// used by a pod template.
type Filter struct {
// imageTag is the tag we want to apply to the inputs
// The name of the image is used as a key, and other fields
// can specify a new name, tag, etc.
ImageTag types.Image `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
// FsSlice contains the FieldSpecs to locate an image field,
// e.g. Path: "spec/myContainers[]/image"
FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
trackableSetter filtersutil.TrackableSetter
}
var _ kio.Filter = Filter{}
var _ kio.TrackableFilter = &Filter{}
// WithMutationTracker registers a callback which will be invoked each time a field is mutated
func (f *Filter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) {
f.trackableSetter.WithMutationTracker(callback)
}
func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
_, err := kio.FilterAll(yaml.FilterFunc(f.filter)).Filter(nodes)
return nodes, err
}
func (f Filter) filter(node *yaml.RNode) (*yaml.RNode, error) {
// FsSlice is an allowlist, not a denyList, so to deny
// something via configuration a new config mechanism is
// needed. Until then, hardcode it.
if f.isOnDenyList(node) {
return node, nil
}
if err := node.PipeE(fsslice.Filter{
FsSlice: f.FsSlice,
SetValue: imageTagUpdater{
ImageTag: f.ImageTag,
trackableSetter: f.trackableSetter,
}.SetImageValue,
}); err != nil {
return nil, err
}
return node, nil
}
func (f Filter) isOnDenyList(node *yaml.RNode) bool {
meta, err := node.GetMeta()
if err != nil {
// A missing 'meta' field will cause problems elsewhere;
// ignore it here to keep the signature simple.
return false
}
// Ignore CRDs
// https://github.com/kubernetes-sigs/kustomize/issues/890
return meta.Kind == `CustomResourceDefinition`
}