mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-22 14:57:01 +00:00
111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transformers
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import (
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"fmt"
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"sigs.k8s.io/kustomize/pkg/expansion"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/transformers/config"
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)
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type RefVarTransformer struct {
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varMap map[string]string
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replacementCounts map[string]int
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fieldSpecs []config.FieldSpec
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mappingFunc func(string) string
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}
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// NewRefVarTransformer returns a new RefVarTransformer
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// that replaces $(VAR) style variables with values.
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// The fieldSpecs are the places to look for occurrences of $(VAR).
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func NewRefVarTransformer(
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varMap map[string]string, fs []config.FieldSpec) *RefVarTransformer {
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return &RefVarTransformer{
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varMap: varMap,
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fieldSpecs: fs,
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}
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}
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// replaceVars accepts as 'in' a string, or string array, which can have
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// embedded instances of $VAR style variables, e.g. a container command string.
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// The function returns the string with the variables expanded to their final
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// values.
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func (rv *RefVarTransformer) replaceVars(in interface{}) (interface{}, error) {
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switch vt := in.(type) {
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case []interface{}:
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var xs []string
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for _, a := range in.([]interface{}) {
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xs = append(xs, expansion.Expand(a.(string), rv.mappingFunc))
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}
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return xs, nil
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case map[string]interface{}:
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inMap := in.(map[string]interface{})
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xs := make(map[string]interface{}, len(inMap))
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for k, v := range inMap {
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s, ok := v.(string)
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if !ok {
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return nil, fmt.Errorf("%#v is expected to be %T", v, s)
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}
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xs[k] = expansion.Expand(s, rv.mappingFunc)
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}
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return xs, nil
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case interface{}:
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s, ok := in.(string)
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if !ok {
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return nil, fmt.Errorf("%#v is expected to be %T", in, s)
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}
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return expansion.Expand(s, rv.mappingFunc), nil
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case nil:
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return nil, nil
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default:
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return "", fmt.Errorf("invalid type encountered %T", vt)
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}
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}
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// UnusedVars returns slice of Var names that were unused
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// after a Transform run.
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func (rv *RefVarTransformer) UnusedVars() []string {
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var unused []string
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for k := range rv.varMap {
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_, ok := rv.replacementCounts[k]
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if !ok {
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unused = append(unused, k)
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}
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}
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return unused
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}
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// Transform replaces $(VAR) style variables with values.
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func (rv *RefVarTransformer) Transform(m resmap.ResMap) error {
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rv.replacementCounts = make(map[string]int)
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rv.mappingFunc = expansion.MappingFuncFor(
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rv.replacementCounts, rv.varMap)
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for id, res := range m {
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for _, fieldSpec := range rv.fieldSpecs {
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if id.Gvk().IsSelected(&fieldSpec.Gvk) {
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if err := mutateField(
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res.Map(), fieldSpec.PathSlice(),
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false, rv.replaceVars); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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