mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-22 14:57:01 +00:00
312 lines
8.7 KiB
Go
312 lines
8.7 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 target implements state for the set of all resources to customize.
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package target
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"log"
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"strings"
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"github.com/ghodss/yaml"
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"github.com/pkg/errors"
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"sigs.k8s.io/kustomize/pkg/constants"
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"sigs.k8s.io/kustomize/pkg/fs"
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"sigs.k8s.io/kustomize/pkg/ifc"
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"sigs.k8s.io/kustomize/pkg/ifc/transformer"
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interror "sigs.k8s.io/kustomize/pkg/internal/error"
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patchtransformer "sigs.k8s.io/kustomize/pkg/patch/transformer"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/resource"
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"sigs.k8s.io/kustomize/pkg/transformers"
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"sigs.k8s.io/kustomize/pkg/transformers/config"
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"sigs.k8s.io/kustomize/pkg/types"
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)
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// KustTarget encapsulates the entirety of a kustomization build.
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type KustTarget struct {
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kustomization *types.Kustomization
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ldr ifc.Loader
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fSys fs.FileSystem
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rFactory *resmap.Factory
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tFactory transformer.Factory
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}
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// NewKustTarget returns a new instance of KustTarget primed with a Loader.
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func NewKustTarget(
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ldr ifc.Loader,
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fSys fs.FileSystem,
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rFactory *resmap.Factory,
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tFactory transformer.Factory) (*KustTarget, error) {
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content, err := loadKustFile(ldr)
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if err != nil {
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return nil, err
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}
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var k types.Kustomization
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err = unmarshal(content, &k)
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if err != nil {
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return nil, err
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}
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k.DealWithDeprecatedFields()
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msgs, errs := k.EnforceFields()
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if len(errs) > 0 {
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return nil, fmt.Errorf(strings.Join(errs, "\n"))
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}
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if len(msgs) > 0 {
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log.Printf(strings.Join(msgs, "\n"))
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}
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return &KustTarget{
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kustomization: &k,
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ldr: ldr,
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fSys: fSys,
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rFactory: rFactory,
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tFactory: tFactory,
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}, nil
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}
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func loadKustFile(ldr ifc.Loader) ([]byte, error) {
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for _, kf := range []string{
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constants.KustomizationFileName,
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constants.SecondaryKustomizationFileName} {
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content, err := ldr.Load(kf)
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if err == nil {
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return content, nil
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}
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if !strings.Contains(err.Error(), "no such file or directory") {
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return nil, err
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}
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}
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return nil, fmt.Errorf("no kustomization.yaml file under %s", ldr.Root())
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}
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func unmarshal(y []byte, o interface{}) error {
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j, err := yaml.YAMLToJSON(y)
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if err != nil {
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return err
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}
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dec := json.NewDecoder(bytes.NewReader(j))
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dec.DisallowUnknownFields()
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return dec.Decode(o)
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}
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// MakeCustomizedResMap creates a ResMap per kustomization instructions.
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// The Resources in the returned ResMap are fully customized.
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func (kt *KustTarget) MakeCustomizedResMap() (resmap.ResMap, error) {
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ra, err := kt.accumulateTarget()
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if err != nil {
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return nil, err
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}
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if kt.shouldAddHashSuffixesToGeneratedResources() {
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// This effects only generated resources.
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// It changes only the Name field in the
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// resource held in the ResMap's value, not
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// the Name in the key in the ResMap.
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err := ra.Transform(kt.tFactory.MakeHashTransformer())
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if err != nil {
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return nil, err
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}
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}
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// Given that names have changed (prefixs/suffixes added),
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// fix all the back references to those names.
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err = ra.FixBackReferences()
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if err != nil {
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return nil, err
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}
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// With all the back references fixed, it's OK to resolve Vars.
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err = ra.ResolveVars()
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return ra.ResMap(), err
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}
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func (kt *KustTarget) shouldAddHashSuffixesToGeneratedResources() bool {
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return kt.kustomization.GeneratorOptions == nil ||
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!kt.kustomization.GeneratorOptions.DisableNameSuffixHash
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}
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// accumulateTarget returns a new ResAccumulator,
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// holding customized resources and the data/rules used
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// to do so. The name back references and vars are
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// not yet fixed.
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func (kt *KustTarget) accumulateTarget() (
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ra *ResAccumulator, err error) {
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// TODO(monopole): Get rid of the KustomizationErrors accumulator.
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// It's not consistently used, and complicates tests.
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errs := &interror.KustomizationErrors{}
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ra, errs = kt.accumulateBases()
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resources, err := kt.rFactory.FromFiles(
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kt.ldr, kt.kustomization.Resources)
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if err != nil {
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errs.Append(errors.Wrap(err, "rawResources failed to read Resources"))
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}
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if len(errs.Get()) > 0 {
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return ra, errs
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}
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err = ra.MergeResourcesWithErrorOnIdCollision(resources)
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if err != nil {
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errs.Append(errors.Wrap(err, "MergeResourcesWithErrorOnIdCollision"))
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}
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tConfig, err := config.MakeTransformerConfig(
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kt.ldr, kt.kustomization.Configurations)
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if err != nil {
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return nil, err
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}
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err = ra.MergeConfig(tConfig)
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if err != nil {
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errs.Append(errors.Wrap(err, "MergeConfig"))
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}
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err = ra.MergeVars(kt.kustomization.Vars)
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if err != nil {
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errs.Append(errors.Wrap(err, "MergeVars"))
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}
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crdTc, err := config.LoadConfigFromCRDs(kt.ldr, kt.kustomization.Crds)
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if err != nil {
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errs.Append(errors.Wrap(err, "LoadCRDs"))
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}
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err = ra.MergeConfig(crdTc)
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if err != nil {
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errs.Append(errors.Wrap(err, "merge CRDs"))
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}
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resMap, err := kt.generateConfigMapsAndSecrets(errs)
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if err != nil {
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errs.Append(errors.Wrap(err, "generateConfigMapsAndSecrets"))
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}
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err = ra.MergeResourcesWithOverride(resMap)
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if err != nil {
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return nil, err
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}
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patches, err := kt.rFactory.RF().SliceFromPatches(
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kt.ldr, kt.kustomization.PatchesStrategicMerge)
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if err != nil {
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errs.Append(errors.Wrap(err, "SliceFromPatches"))
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}
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if len(errs.Get()) > 0 {
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return nil, errs
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}
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t, err := kt.newTransformer(patches, ra.tConfig)
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if err != nil {
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return nil, err
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}
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err = ra.Transform(t)
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if err != nil {
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return nil, err
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}
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return ra, nil
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}
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func (kt *KustTarget) generateConfigMapsAndSecrets(
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errs *interror.KustomizationErrors) (resmap.ResMap, error) {
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kt.rFactory.Set(kt.ldr)
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cms, err := kt.rFactory.NewResMapFromConfigMapArgs(
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kt.kustomization.ConfigMapGenerator, kt.kustomization.GeneratorOptions)
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if err != nil {
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errs.Append(errors.Wrap(err, "NewResMapFromConfigMapArgs"))
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}
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secrets, err := kt.rFactory.NewResMapFromSecretArgs(
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kt.kustomization.SecretGenerator, kt.kustomization.GeneratorOptions)
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if err != nil {
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errs.Append(errors.Wrap(err, "NewResMapFromSecretArgs"))
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}
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return resmap.MergeWithErrorOnIdCollision(cms, secrets)
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}
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// accumulateBases returns a new ResAccumulator
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// holding customized resources and the data/rules
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// used to customized them from only the _bases_
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// of this KustTarget.
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func (kt *KustTarget) accumulateBases() (
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ra *ResAccumulator, errs *interror.KustomizationErrors) {
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errs = &interror.KustomizationErrors{}
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ra = MakeEmptyAccumulator()
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for _, path := range kt.kustomization.Bases {
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ldr, err := kt.ldr.New(path)
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if err != nil {
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errs.Append(errors.Wrap(err, "couldn't make loader for "+path))
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continue
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}
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subKt, err := NewKustTarget(
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ldr, kt.fSys, kt.rFactory, kt.tFactory)
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if err != nil {
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errs.Append(errors.Wrap(err, "couldn't make target for "+path))
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ldr.Cleanup()
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continue
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}
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subRa, err := subKt.accumulateTarget()
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if err != nil {
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errs.Append(errors.Wrap(err, "accumulateTarget"))
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ldr.Cleanup()
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continue
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}
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err = ra.MergeAccumulator(subRa)
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if err != nil {
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errs.Append(errors.Wrap(err, path))
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}
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ldr.Cleanup()
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}
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return ra, errs
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}
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// newTransformer makes a Transformer that does a collection
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// of object transformations.
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func (kt *KustTarget) newTransformer(
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patches []*resource.Resource, tConfig *config.TransformerConfig) (
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transformers.Transformer, error) {
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var r []transformers.Transformer
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t, err := kt.tFactory.MakePatchTransformer(patches, kt.rFactory.RF())
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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r = append(r, transformers.NewNamespaceTransformer(
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string(kt.kustomization.Namespace), tConfig.NameSpace))
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t, err = transformers.NewNamePrefixSuffixTransformer(
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string(kt.kustomization.NamePrefix),
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string(kt.kustomization.NameSuffix),
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tConfig.NamePrefix,
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)
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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t, err = transformers.NewLabelsMapTransformer(
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kt.kustomization.CommonLabels, tConfig.CommonLabels)
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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t, err = transformers.NewAnnotationsMapTransformer(
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kt.kustomization.CommonAnnotations, tConfig.CommonAnnotations)
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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t, err = patchtransformer.NewPatchJson6902Factory(kt.ldr).
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MakePatchJson6902Transformer(kt.kustomization.PatchesJson6902)
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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t, err = transformers.NewImageTransformer(kt.kustomization.Images)
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if err != nil {
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return nil, err
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}
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r = append(r, t)
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return transformers.NewMultiTransformer(r), nil
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}
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