Merge pull request #2784 from rocky-nupt/proposal-add-k8s-version

feat(tiller/proto):Allow charts to specify k8s compatibility 

_proto/hapi/chart/metadata.proto

@@ -87,4 +87,7 @@ message Metadata {
 	// Annotations are additional mappings uninterpreted by Tiller,
 	// made available for inspection by other applications.
 	map<string,string> annotations = 16;
+
+	// KubeVersion is a SemVer constraint specifying the version of Kubernetes required.
+        string kubeVersion = 17;
 }

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

@@ -107,6 +107,8 @@ type Metadata struct {
 	// Annotations are additional mappings uninterpreted by Tiller,
 	// made available for inspection by other applications.
 	Annotations map[string]string `protobuf:"bytes,16,rep,name=annotations" json:"annotations,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+	// KubeVersion is  a SemVer constraints on what version of Kubernetes is required.
+	KubeVersion string `protobuf:"bytes,17,opt,name=kubeVersion" json:"kubeVersion,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
@@ -226,6 +228,13 @@ func (m *Metadata) GetAnnotations() map[string]string {
 	return nil
 }
 
+func (m *Metadata) GetKubeVersion() string {
+	if m != nil {
+		return m.KubeVersion
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterType((*Maintainer)(nil), "hapi.chart.Maintainer")
 	proto.RegisterType((*Metadata)(nil), "hapi.chart.Metadata")
@@ -235,32 +244,32 @@ func init() {
 func init() { proto.RegisterFile("hapi/chart/metadata.proto", fileDescriptor2) }
 
 var fileDescriptor2 = []byte{
-	// 420 bytes of a gzipped FileDescriptorProto
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-	0xf2, 0x02, 0x00, 0x00,
+	// 427 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x52, 0x5d, 0x6b, 0xdb, 0x30,
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+	0x00, 0xff, 0xff, 0x7f, 0xc1, 0xec, 0x3d, 0x02, 0x03, 0x00, 0x00,
 }

pkg/tiller/release_install_test.go

@@ -452,3 +452,49 @@ func TestInstallRelease_ReuseName(t *testing.T) {
 		t.Errorf("Release status is %q", getres.Info.Status.Code)
 	}
 }
+
+func TestInstallRelease_KubeVersion(t *testing.T) {
+	c := helm.NewContext()
+	rs := rsFixture()
+
+	// TODO: Refactor this into a mock.
+	req := &services.InstallReleaseRequest{
+		Chart: &chart.Chart{
+			Metadata: &chart.Metadata{Name: "hello", KubeVersion: ">=0.0.0"},
+			Templates: []*chart.Template{
+				{Name: "templates/hello", Data: []byte("hello: world")},
+				{Name: "templates/hooks", Data: []byte(manifestWithHook)},
+			},
+		},
+	}
+	_, err := rs.InstallRelease(c, req)
+	fmt.Println(err)
+	if err != nil {
+		t.Fatalf("Expected valid range. Got %q", err)
+	}
+}
+
+func TestInstallRelease_WrongKubeVersion(t *testing.T) {
+	c := helm.NewContext()
+	rs := rsFixture()
+
+	// TODO: Refactor this into a mock.
+	req := &services.InstallReleaseRequest{
+		Chart: &chart.Chart{
+			Metadata: &chart.Metadata{Name: "hello", KubeVersion: ">=5.0.0"},
+			Templates: []*chart.Template{
+				{Name: "templates/hello", Data: []byte("hello: world")},
+				{Name: "templates/hooks", Data: []byte(manifestWithHook)},
+			},
+		},
+	}
+	_, err := rs.InstallRelease(c, req)
+	if err == nil {
+		t.Fatalf("Expected to fail because of wrong version")
+	}
+
+	expect := "Chart requires kubernetesVersion"
+	if !strings.Contains(err.Error(), expect) {
+		t.Errorf("Expected %q to contain %q", err.Error(), expect)
+	}
+}

pkg/tiller/release_server.go

@@ -252,6 +252,15 @@ func (s *ReleaseServer) renderResources(ch *chart.Chart, values chartutil.Values
 		return nil, nil, "", fmt.Errorf("Chart incompatible with Tiller %s", sver)
 	}
 
+	if ch.Metadata.KubeVersion != "" {
+		cap, _ := values["Capabilities"].(*chartutil.Capabilities)
+		gitVersion := cap.KubeVersion.String()
+		k8sVersion := strings.Split(gitVersion, "+")[0]
+		if !version.IsCompatibleRange(ch.Metadata.KubeVersion, k8sVersion) {
+			return nil, nil, "", fmt.Errorf("Chart requires kubernetesVersion: %s which is incompatible with Kubernetes %s", ch.Metadata.KubeVersion, k8sVersion)
+		}
+	}
+
 	s.Log("rendering %s chart using values", ch.GetMetadata().Name)
 	renderer := s.engine(ch)
 	files, err := renderer.Render(ch, values)