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migrate2to3.go
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migrate2to3.go
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package maintenance_helper
import (
"context"
"fmt"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/cli-runtime/pkg/resource"
"github.com/werf/logboek"
)
func Migrate2To3(ctx context.Context, helm2ReleaseName, helm3ReleaseName, helm3Namespace string, maintenanceHelper *MaintenanceHelper) error {
foundHelm3Release, err := maintenanceHelper.IsHelm3ReleaseExist(ctx, helm3ReleaseName)
if err != nil {
return fmt.Errorf("error checking existence of helm 3 release %q: %w", helm2ReleaseName, err)
}
if foundHelm3Release {
return fmt.Errorf("found already existing helm 3 release %q", helm3ReleaseName)
}
foundHelm2Release, err := maintenanceHelper.IsHelm2ReleaseExist(ctx, helm2ReleaseName)
if err != nil {
return fmt.Errorf("error checking existence of helm 2 release %q: %w", helm2ReleaseName, err)
}
if !foundHelm2Release {
return fmt.Errorf("not found helm 2 release %q", helm2ReleaseName)
}
releaseData, err := maintenanceHelper.GetHelm2ReleaseData(ctx, helm2ReleaseName)
if err != nil {
return fmt.Errorf("unable to get helm 2 release %q info: %w", helm2ReleaseName, err)
}
infos, err := maintenanceHelper.BuildHelm2ResourcesInfos(releaseData)
if err != nil {
return fmt.Errorf("error building resources infos for release %q: %w", helm2ReleaseName, err)
}
metadataAccessor := meta.NewAccessor()
logboek.Context(ctx).LogOptionalLn()
if err := logboek.Context(ctx).Default().LogProcess("Migrating %d resources of the release %q", len(infos), helm2ReleaseName).DoError(func() error {
for _, info := range infos {
logboek.Context(ctx).Default().LogF("%s\n", info.ObjectName())
helper := resource.NewHelper(info.Client, info.Mapping)
obj, err := helper.Get(info.Namespace, info.Name)
if apierrors.IsNotFound(err) {
logboek.Context(ctx).Default().LogF(" %s not found: ignoring\n", info.ObjectName())
continue
} else if err != nil {
return fmt.Errorf("error getting resource %s spec from %q namespace: %w", info.ObjectName(), info.Namespace, err)
}
annotations, err := metadataAccessor.Annotations(obj)
if err != nil {
return fmt.Errorf("error accessing annotations of %s: %w", info.ObjectName(), err)
}
if annotations == nil {
annotations = make(map[string]string)
}
annotations["meta.helm.sh/release-name"] = helm3ReleaseName
annotations["meta.helm.sh/release-namespace"] = helm3Namespace
if err := metadataAccessor.SetAnnotations(obj, annotations); err != nil {
return fmt.Errorf("error setting annotations of %s: %w", info.ObjectName(), err)
}
labels, err := metadataAccessor.Labels(obj)
if err != nil {
return fmt.Errorf("error accessing labels of %s: %w", info.ObjectName(), err)
}
if labels == nil {
labels = make(map[string]string)
}
labels["app.kubernetes.io/managed-by"] = "Helm"
if err := metadataAccessor.SetLabels(obj, labels); err != nil {
return fmt.Errorf("error setting labels of %s: %w", info.ObjectName(), err)
}
if _, err := helper.Replace(info.Namespace, info.Name, false, obj); err != nil {
return fmt.Errorf("error replacing %s: %w", info.ObjectName(), err)
}
}
return nil
}); err != nil {
return err
}
logboek.Context(ctx).LogOptionalLn()
if err := logboek.Context(ctx).Default().LogProcess("Creating helm 3 release %q", helm3ReleaseName).DoError(func() error {
if err := maintenanceHelper.CreateHelm3ReleaseMetadataFromHelm2Release(ctx, helm3ReleaseName, helm3Namespace, releaseData); err != nil {
return fmt.Errorf("unable to create helm 3 release %q: %w", helm3ReleaseName, err)
}
return nil
}); err != nil {
return err
}
logboek.Context(ctx).LogOptionalLn()
if err := logboek.Context(ctx).Default().LogProcess("Deleting helm 2 metadata for release %q", helm2ReleaseName).DoError(func() error {
if err := maintenanceHelper.DeleteHelm2ReleaseMetadata(ctx, helm2ReleaseName); err != nil {
return fmt.Errorf("unable to delete helm 2 release storage metadata for the release %q: %w", helm2ReleaseName, err)
}
return nil
}); err != nil {
return err
}
logboek.Context(ctx).LogOptionalLn()
logboek.Context(ctx).Default().LogFDetails(" + Successfully migrated helm 2 release %q into helm 3 release %q in the %q namespace\n", helm2ReleaseName, helm3ReleaseName, helm3Namespace)
return nil
}