124 lines
3.9 KiB
Go
124 lines
3.9 KiB
Go
/*
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Copyright 2023 The Flux 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 action
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import (
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"context"
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"fmt"
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"strings"
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helmaction "helm.sh/helm/v3/pkg/action"
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helmrelease "helm.sh/helm/v3/pkg/release"
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"k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/utils/ptr"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
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"github.com/fluxcd/pkg/ssa"
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"github.com/fluxcd/pkg/ssa/jsondiff"
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v2 "github.com/fluxcd/helm-controller/api/v2beta2"
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)
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// Diff returns a jsondiff.DiffSet of the changes between the state of the
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// cluster and the Helm release.Release manifest.
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func Diff(ctx context.Context, config *helmaction.Configuration, rls *helmrelease.Release, fieldOwner string, ignore ...v2.IgnoreRule) (jsondiff.DiffSet, error) {
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// Create a dry-run only client to use solely for diffing.
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cfg, err := config.RESTClientGetter.ToRESTConfig()
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if err != nil {
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return nil, err
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}
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c, err := client.New(cfg, client.Options{DryRun: ptr.To(true)})
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if err != nil {
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return nil, err
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}
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// Read the release manifest and normalize the objects.
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objects, err := ssa.ReadObjects(strings.NewReader(rls.Manifest))
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if err != nil {
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return nil, fmt.Errorf("failed to read objects from release manifest: %w", err)
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}
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if err = ssa.NormalizeUnstructuredListWithScheme(objects, c.Scheme()); err != nil {
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return nil, fmt.Errorf("failed to normalize release objects: %w", err)
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}
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var (
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isNamespacedGVK = map[string]bool{}
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errs []error
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)
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for _, obj := range objects {
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if obj.GetNamespace() == "" {
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// Manifest does not contain the namespace of the release.
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// Figure out if the object is namespaced if the namespace is not
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// explicitly set, and configure the namespace accordingly.
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objGVK := obj.GetObjectKind().GroupVersionKind().String()
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if _, ok := isNamespacedGVK[objGVK]; !ok {
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namespaced, err := apiutil.IsObjectNamespaced(obj, c.Scheme(), c.RESTMapper())
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if err != nil {
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errs = append(errs, fmt.Errorf("failed to determine if %s is namespace scoped: %w",
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obj.GetObjectKind().GroupVersionKind().Kind, err))
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continue
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}
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// Cache the result, so we don't have to do this for every object
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isNamespacedGVK[objGVK] = namespaced
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}
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if isNamespacedGVK[objGVK] {
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obj.SetNamespace(rls.Namespace)
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}
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}
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}
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// Base configuration for the diffing of the object.
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diffOpts := []jsondiff.ListOption{
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jsondiff.FieldOwner(fieldOwner),
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jsondiff.ExclusionSelector{v2.DriftDetectionMetadataKey: v2.DriftDetectionDisabledValue},
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jsondiff.MaskSecrets(true),
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jsondiff.Rationalize(true),
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jsondiff.Graceful(true),
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}
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// Add ignore rules to the diffing configuration.
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var ignoreRules jsondiff.IgnoreRules
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for _, rule := range ignore {
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r := jsondiff.IgnoreRule{
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Paths: rule.Paths,
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}
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if rule.Target != nil {
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r.Selector = &jsondiff.Selector{
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Group: rule.Target.Group,
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Version: rule.Target.Version,
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Kind: rule.Target.Kind,
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Name: rule.Target.Name,
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Namespace: rule.Target.Namespace,
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AnnotationSelector: rule.Target.AnnotationSelector,
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LabelSelector: rule.Target.LabelSelector,
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}
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}
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ignoreRules = append(ignoreRules, r)
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}
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if len(ignoreRules) > 0 {
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diffOpts = append(diffOpts, ignoreRules)
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}
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// Actually diff the objects.
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set, err := jsondiff.UnstructuredList(ctx, c, objects, diffOpts...)
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if err != nil {
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errs = append(errs, err)
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}
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return set, errors.Reduce(errors.Flatten(errors.NewAggregate(errs)))
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}
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