Change release storage name to use helm storage type as prefix (#6500)

* Change release storage name to prefix helm storage type

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

* Add comments about the Kubernetes storage object type field content

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

pkg/storage/driver/memory.go

@@ -49,7 +49,8 @@ func (mem *Memory) Name() string {
 func (mem *Memory) Get(key string) (*rspb.Release, error) {
 	defer unlock(mem.rlock())
 
-	switch elems := strings.Split(key, ".v"); len(elems) {
+	keyWithoutPrefix := strings.TrimPrefix(key, "sh.helm.release.v1.")
+	switch elems := strings.Split(keyWithoutPrefix, ".v"); len(elems) {
 	case 2:
 		name, ver := elems[0], elems[1]
 		if _, err := strconv.Atoi(ver); err != nil {
@@ -138,7 +139,8 @@ func (mem *Memory) Update(key string, rls *rspb.Release) error {
 func (mem *Memory) Delete(key string) (*rspb.Release, error) {
 	defer unlock(mem.wlock())
 
-	elems := strings.Split(key, ".v")
+	keyWithoutPrefix := strings.TrimPrefix(key, "sh.helm.release.v1.")
+	elems := strings.Split(keyWithoutPrefix, ".v")
 
 	if len(elems) != 2 {
 		return nil, ErrInvalidKey

pkg/storage/driver/secrets.go

@@ -228,13 +228,23 @@ func newSecretsObject(key string, rls *rspb.Release, lbs labels) (*v1.Secret, er
 	lbs.set("status", rls.Info.Status.String())
 	lbs.set("version", strconv.Itoa(rls.Version))
 
-	// create and return secret object
+	// create and return secret object.
+	// Helm 3 introduced setting the 'Type' field
+	// in the Kubernetes storage object.
+	// Helm defines the field content as follows:
+	// <helm_domain>/<helm_object>.v<helm_object_version>
+	// Type field for Helm 3: helm.sh/release.v1
+	// Note: Version starts at 'v1' for Helm 3 and
+	// should be incremented if the release object
+	// metadata is modified.
+	// This would potentially be a breaking change
+	// and should only happen between major versions.
 	return &v1.Secret{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:   key,
 			Labels: lbs.toMap(),
 		},
-		Type: "helm.sh/release",
+		Type: "helm.sh/release.v1",
 		Data: map[string][]byte{"release": []byte(s)},
 	}, nil
 }

pkg/storage/storage.go

@@ -27,6 +27,13 @@ import (
 	"helm.sh/helm/pkg/storage/driver"
 )
 
+// The type field of the Kubernetes storage object which stores the Helm release
+// version. It is modified slightly replacing the '/': sh.helm/release.v1
+// Note: The version 'v1' is incremented if the release object metadata is
+// modified between major releases.
+// This constant is used as a prefix for the Kubernetes storage object name.
+const HelmStorageType = "sh.helm.release.v1"
+
 // Storage represents a storage engine for a Release.
 type Storage struct {
 	driver.Driver
@@ -205,11 +212,14 @@ func (s *Storage) Last(name string) (*rspb.Release, error) {
 	return h[0], nil
 }
 
-// makeKey concatenates a release name and version into
-// a string with format ```<release_name>#v<version>```.
+// makeKey concatenates the Kubernetes storage object type, a release name and version
+// into a string with format:```<helm_storage_type>.<release_name>.v<release_version>```.
+// The storage type is prepended to keep name uniqueness between different
+// release storage types. An example of clash when not using the type:
+// https://github.com/helm/helm/issues/6435.
 // This key is used to uniquely identify storage objects.
 func makeKey(rlsname string, version int) string {
-	return fmt.Sprintf("%s.v%d", rlsname, version)
+	return fmt.Sprintf("%s.%s.v%d", HelmStorageType, rlsname, version)
 }
 
 // Init initializes a new storage backend with the driver d.