feat(proto): add appVersion field

This provides a simple field to expose the version of the application
contained in a chart.

Closes #2036

_proto/hapi/chart/metadata.proto

@@ -70,4 +70,7 @@ message Metadata {
 
 	// The tags to check to enable chart
 	string tags = 12;
+
+	// The version of the application enclosed inside of this chart.
+	string appVersion = 13;
 }

docs/charts.md

@@ -53,6 +53,7 @@ maintainers: # (optional)
     email: The maintainer's email (optional for each maintainer)
 engine: gotpl # The name of the template engine (optional, defaults to gotpl)
 icon: A URL to an SVG or PNG image to be used as an icon (optional).
+appVersion: The version of the app that this contains (optional). This needn't be SemVer.
 ```
 
 If you are familiar with the `Chart.yaml` file format for Helm Classic, you will
@@ -91,6 +92,14 @@ in the `Chart.yaml` as a token in the package name. The system assumes
 that the version number in the chart package name matches the version number in
 the `Chart.yaml`. Failure to meet this assumption will cause an error.
 
+### The appVersion field
+
+Note that the `appVersion` field is not related to the `version` field. It is
+a way of specifying the version of the application. For example, the `drupal`
+chart may have an `appVersion: 8.2.1`, indicating that the version of Drupal
+included in the chart (by default) is `8.2.1`. This field is informational, and
+has no impact on chart version calculations.
+
 ## Chart LICENSE, README and NOTES
 
 Charts can also contain files that describe the installation, configuration, usage and license of a

docs/examples/alpine/Chart.yaml

@@ -4,3 +4,4 @@ version: 0.1.0
 home: https://k8s.io/helm
 sources:
   - https://github.com/kubernetes/helm
+appVersion: 3.3

pkg/proto/hapi/chart/metadata.pb.go

@@ -74,7 +74,9 @@ type Metadata struct {
 	// The condition to check to enable chart
 	Condition string `protobuf:"bytes,11,opt,name=condition" json:"condition,omitempty"`
 	// The tags to check to enable chart
-	Tags []string `protobuf:"bytes,12,opt,name=tags" json:"tags,omitempty"`
+	Tags string `protobuf:"bytes,12,opt,name=tags" json:"tags,omitempty"`
+	// The version of the application enclosed inside of this chart.
+	AppVersion string `protobuf:"bytes,13,opt,name=appVersion" json:"appVersion,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
@@ -98,25 +100,26 @@ func init() {
 func init() { proto.RegisterFile("hapi/chart/metadata.proto", fileDescriptor2) }
 
 var fileDescriptor2 = []byte{
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 }