feat(helm): add --reset-values flag to 'helm upgrade'

The --reset-values flag on upgrade instructs Tiller to reset the
upgraded release to the chart's built-in values.yaml, and ignore the
last install's overridden values.

Closes #1569

_proto/hapi/services/tiller.proto

@@ -192,6 +192,8 @@ message UpdateReleaseRequest {
 	bool recreate = 6;
 	// timeout specifies the max amount of time any kubernetes client command can run.
 	int64 timeout = 7;
+	// ResetValues will cause Tiller to ignore stored values, resetting to default values.
+	bool reset_values = 8;
 }
 
 // UpdateReleaseResponse is the response to an update request.

cmd/helm/upgrade.go

@@ -64,6 +64,7 @@ type upgradeCmd struct {
 	namespace    string
 	version      string
 	timeout      int64
+	resetValues  bool
 }
 
 func newUpgradeCmd(client helm.Interface, out io.Writer) *cobra.Command {
@@ -104,6 +105,7 @@ func newUpgradeCmd(client helm.Interface, out io.Writer) *cobra.Command {
 	f.StringVar(&upgrade.namespace, "namespace", "default", "namespace to install the release into (only used if --install is set)")
 	f.StringVar(&upgrade.version, "version", "", "specify the exact chart version to use. If this is not specified, the latest version is used")
 	f.Int64Var(&upgrade.timeout, "timeout", 300, "time in seconds to wait for any individual kubernetes operation (like Jobs for hooks)")
+	f.BoolVar(&upgrade.resetValues, "reset-values", false, "when upgrading, reset the values to the ones built into the chart")
 
 	f.MarkDeprecated("disable-hooks", "use --no-hooks instead")
 
@@ -156,7 +158,8 @@ func (u *upgradeCmd) run() error {
 		helm.UpgradeDryRun(u.dryRun),
 		helm.UpgradeRecreate(u.recreate),
 		helm.UpgradeDisableHooks(u.disableHooks),
-		helm.UpgradeTimeout(u.timeout))
+		helm.UpgradeTimeout(u.timeout),
+		helm.ResetValues(u.resetValues))
 	if err != nil {
 		return fmt.Errorf("UPGRADE FAILED: %v", prettyError(err))
 	}

cmd/helm/upgrade_test.go

@@ -93,6 +93,13 @@ func TestUpgradeCmd(t *testing.T) {
 			resp:     releaseMock(&releaseOptions{name: "funny-bunny", version: 3, chart: ch2}),
 			expected: "Release \"funny-bunny\" has been upgraded. Happy Helming!\n",
 		},
+		{
+			name:     "upgrade a release with --reset-values",
+			args:     []string{"funny-bunny", chartPath},
+			flags:    []string{"--reset-values", "true"},
+			resp:     releaseMock(&releaseOptions{name: "funny-bunny", version: 4, chart: ch2}),
+			expected: "Release \"funny-bunny\" has been upgraded. Happy Helming!\n",
+		},
 		{
 			name:     "install a release with 'upgrade --install'",
 			args:     []string{"zany-bunny", chartPath},

pkg/helm/client.go

@@ -134,6 +134,7 @@ func (h *Client) UpdateRelease(rlsName string, chstr string, opts ...UpdateOptio
 	req.Name = rlsName
 	req.DisableHooks = h.opts.disableHooks
 	req.Recreate = h.opts.recreate
+	req.ResetValues = h.opts.resetValues
 	ctx := NewContext()
 
 	if h.opts.before != nil {

pkg/helm/option.go

@@ -64,6 +64,8 @@ type options struct {
 	before func(context.Context, proto.Message) error
 	// release history options are applied directly to the get release history request
 	histReq rls.GetHistoryRequest
+	// resetValues instructs Tiller to reset values to their defaults.
+	resetValues bool
 }
 
 // Host specifies the host address of the Tiller release server, (default = ":44134").
@@ -270,6 +272,12 @@ func UpgradeDryRun(dry bool) UpdateOption {
 	}
 }
 
+func ResetValues(reset bool) UpdateOption {
+	return func(opts *options) {
+		opts.resetValues = reset
+	}
+}
+
 // UpgradeRecreate will (if true) recreate pods after upgrade.
 func UpgradeRecreate(recreate bool) UpdateOption {
 	return func(opts *options) {

pkg/proto/hapi/services/tiller.pb.go

@@ -250,6 +250,8 @@ type UpdateReleaseRequest struct {
 	Recreate bool `protobuf:"varint,6,opt,name=recreate" json:"recreate,omitempty"`
 	// timeout specifies the max amount of time any kubernetes client command can run.
 	Timeout int64 `protobuf:"varint,7,opt,name=timeout" json:"timeout,omitempty"`
+	// ResetValues will cause Tiller to ignore stored values, resetting to default values.
+	ResetValues bool `protobuf:"varint,8,opt,name=reset_values,json=resetValues" json:"reset_values,omitempty"`
 }
 
 func (m *UpdateReleaseRequest) Reset()                    { *m = UpdateReleaseRequest{} }
@@ -892,72 +894,73 @@ var _ReleaseService_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("hapi/services/tiller.proto", fileDescriptor0) }
 
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-	0xf7, 0x00, 0x22, 0xbc, 0xa4, 0x78, 0xcc, 0xc1, 0x6b, 0xfc, 0x7c, 0x83, 0xef, 0x0c, 0x65, 0xb9,
+	0xca, 0x1a, 0x91, 0x8a, 0xf5, 0xca, 0x0a, 0xeb, 0x85, 0x92, 0x4d, 0x2b, 0x71, 0x33, 0x55, 0xe2,
-	0x2a, 0x8e, 0xeb, 0x3a, 0xc7, 0x57, 0x70, 0x92, 0xa6, 0x65, 0x5b, 0x8a, 0x7f, 0x33, 0xe0, 0xf4,
+	0xe8, 0x03, 0x80, 0x08, 0x2f, 0x28, 0x1e, 0x71, 0xf0, 0x1a, 0x3f, 0xdf, 0xe0, 0x3b, 0x03, 0x59,
-	0x26, 0xf4, 0x33, 0x49, 0xce, 0x4a, 0xb6, 0x47, 0x61, 0x97, 0x32, 0xc2, 0x3e, 0x82, 0xea, 0x62,
+	0xd1, 0x8a, 0xe3, 0xba, 0xce, 0xf1, 0x25, 0x1c, 0xa5, 0x69, 0xd9, 0x94, 0xe2, 0x3f, 0x0c, 0x38,
-	0x19, 0xbd, 0xc6, 0x92, 0x46, 0xb1, 0x58, 0x8f, 0xa7, 0xa2, 0xc7, 0x33, 0x06, 0xeb, 0xb1, 0x0f,
+	0xbe, 0x0e, 0xfd, 0x4c, 0x92, 0xb3, 0x92, 0xed, 0x41, 0xd8, 0xa5, 0x8c, 0xb0, 0x0f, 0xa0, 0x3a,
-	0x5b, 0x46, 0x14, 0x7b, 0x9d, 0xf4, 0xd6, 0x86, 0xe8, 0xa3, 0xce, 0x13, 0x38, 0x1c, 0x60, 0xf6,
+	0x5f, 0x44, 0xaf, 0xb0, 0xa4, 0x51, 0x2c, 0x56, 0xe3, 0xa9, 0xe8, 0xf1, 0x8c, 0xc0, 0x7a, 0xe8,
-	0x83, 0x48, 0x6c, 0x19, 0x9e, 0xd3, 0x07, 0xb4, 0xbe, 0xf9, 0x60, 0x4f, 0x6e, 0xe9, 0xf6, 0xd4,
+	0xc3, 0x86, 0x11, 0xc5, 0x5e, 0x27, 0xed, 0xb7, 0x21, 0x5a, 0xad, 0xf3, 0x08, 0xf6, 0xfb, 0x98,
-	0xa7, 0x84, 0xd2, 0x57, 0x5a, 0xce, 0x97, 0x1c, 0xfb, 0xd2, 0xa7, 0x8c, 0x44, 0xab, 0x4d, 0xd4,
+	0xbd, 0x14, 0x89, 0x2d, 0xc3, 0x73, 0x7a, 0x80, 0x56, 0x37, 0xef, 0xed, 0xc9, 0x2d, 0xdd, 0x9e,
-	0x35, 0xa1, 0x3c, 0xf7, 0xde, 0xca, 0xd6, 0x1b, 0xbf, 0x3a, 0x03, 0xee, 0x41, 0x72, 0x54, 0x7a,
+	0xfa, 0xda, 0x50, 0xfa, 0x4a, 0xcb, 0xf9, 0x86, 0x63, 0x5f, 0xf8, 0x94, 0x91, 0x68, 0xb9, 0x8e,
-	0xb0, 0x3e, 0xc8, 0x8c, 0x42, 0x83, 0xac, 0xfb, 0x77, 0x0d, 0x0e, 0xd4, 0xf4, 0x11, 0xdf, 0x0a,
+	0xba, 0x26, 0x94, 0x67, 0xde, 0x1b, 0xd9, 0x9d, 0xe3, 0x57, 0xa7, 0xcf, 0x3d, 0x48, 0x8e, 0x4a,
-	0xc8, 0x87, 0xbd, 0xf5, 0x31, 0x8b, 0x3e, 0xce, 0xff, 0x94, 0x48, 0x7d, 0x0f, 0xd9, 0xcf, 0x8a,
+	0x0f, 0x56, 0x67, 0x9d, 0x51, 0x68, 0xd6, 0x75, 0xfe, 0xab, 0xc1, 0x9e, 0x1a, 0x50, 0xe2, 0x73,
-	0xa8, 0x0a, 0x67, 0x9d, 0x9d, 0xcf, 0x0c, 0x44, 0xa1, 0x99, 0x9e, 0x7e, 0xe8, 0x79, 0x36, 0x46,
+	0x02, 0xf9, 0xb0, 0xb3, 0x3a, 0x89, 0xd1, 0x67, 0xf9, 0x5f, 0x1b, 0xa9, 0x4f, 0x26, 0xfb, 0x49,
-	0xce, 0xb8, 0xb5, 0x3b, 0x45, 0xd5, 0x95, 0x59, 0x74, 0xcf, 0x69, 0xd7, 0x47, 0x16, 0x7a, 0x27,
+	0x11, 0x55, 0xe1, 0xac, 0xb3, 0xf5, 0xa5, 0x81, 0x28, 0x34, 0xd3, 0x03, 0x12, 0x3d, 0xcd, 0xc6,
-	0x8c, 0x3e, 0x25, 0xed, 0xf3, 0xc2, 0xfa, 0x89, 0xdd, 0x5f, 0x60, 0x5f, 0x6b, 0xf3, 0x28, 0x87,
+	0xc8, 0x99, 0xc8, 0x76, 0xbb, 0xa8, 0xba, 0x32, 0x8b, 0xee, 0x38, 0xed, 0xfa, 0x54, 0x43, 0x6f,
-	0xad, 0xac, 0x01, 0x68, 0x7f, 0x52, 0x48, 0x37, 0xb1, 0x35, 0x87, 0x03, 0xbd, 0xce, 0x51, 0x0e,
+	0x85, 0xd1, 0x07, 0xa9, 0x7d, 0x56, 0x58, 0x3f, 0xb1, 0xfb, 0x1b, 0xec, 0x6a, 0x6d, 0x1e, 0xe5,
-	0x40, 0x66, 0x93, 0xb4, 0x3f, 0x2d, 0xa6, 0x9c, 0x98, 0xa3, 0xd0, 0x4c, 0x97, 0x61, 0xde, 0x3d,
+	0xb0, 0x95, 0x35, 0x23, 0xed, 0xcf, 0x0b, 0xe9, 0x26, 0xb6, 0x66, 0xb0, 0xa7, 0xd7, 0x39, 0xca,
-	0xe6, 0xb4, 0x8c, 0xbc, 0x7b, 0xcc, 0xab, 0x6e, 0x67, 0x07, 0x79, 0x00, 0x0f, 0x55, 0x88, 0x9e,
+	0x01, 0xc8, 0x6c, 0x92, 0xf6, 0x17, 0xc5, 0x94, 0x13, 0x73, 0x14, 0x9a, 0xe9, 0x32, 0xcc, 0xbb,
-	0xe6, 0x5e, 0x88, 0x5e, 0xbc, 0x76, 0xfb, 0xdd, 0x8a, 0x89, 0x89, 0x05, 0xfc, 0x2f, 0x35, 0x92,
+	0xc7, 0x9c, 0x96, 0x91, 0x77, 0x8f, 0x79, 0xd5, 0xed, 0x6c, 0x21, 0x0f, 0xe0, 0xbe, 0x0a, 0xd1,
-	0x50, 0x0e, 0x35, 0xd9, 0x53, 0xd7, 0x7e, 0x5e, 0x50, 0x3b, 0x15, 0x94, 0x2c, 0xec, 0x0d, 0x41,
+	0xe3, 0xdc, 0x0b, 0xd1, 0x8b, 0xd7, 0x6e, 0xbd, 0x5d, 0x31, 0x31, 0x31, 0x87, 0xf7, 0x52, 0x23,
-	0xe9, 0x5d, 0x63, 0x43, 0x50, 0xa9, 0x1e, 0xe1, 0xec, 0xbc, 0x80, 0x9f, 0xea, 0x4a, 0xef, 0xd6,
+	0x09, 0xe5, 0x50, 0x93, 0x3d, 0x75, 0xed, 0xa7, 0x05, 0xb5, 0x53, 0x41, 0xc9, 0xc2, 0x5e, 0x13,
-	0xe4, 0xff, 0x6f, 0xbe, 0xf8, 0x37, 0x00, 0x00, 0xff, 0xff, 0xae, 0xe0, 0xb8, 0xc3, 0xb0, 0x0d,
+	0x94, 0xde, 0x35, 0xd6, 0x04, 0x95, 0xea, 0x11, 0xce, 0xd6, 0x33, 0xf8, 0xa5, 0xae, 0xf4, 0x6e,
-	0x00, 0x00,
+	0x4c, 0xfe, 0x17, 0xe8, 0xeb, 0xff, 0x03, 0x00, 0x00, 0xff, 0xff, 0x83, 0x62, 0xce, 0x77, 0xd3,
+	0x0d, 0x00, 0x00,
 }

pkg/tiller/release_server.go

@@ -323,11 +323,26 @@ func (s *ReleaseServer) performUpdate(originalRelease, updatedRelease *release.R
 	return res, nil
 }
 
-// reuseValues copies values from the current release to a new release if the new release does not have any values.
+// reuseValues copies values from the current release to a new release if the
+// new release does not have any values.
 //
-// If the request already has values, or if there are no values in the current release, this does nothing.
+// If the request already has values, or if there are no values in the current
+// release, this does nothing.
+//
+// This is skipped if the req.ResetValues flag is set, in which case the
+// request values are not altered.
 func (s *ReleaseServer) reuseValues(req *services.UpdateReleaseRequest, current *release.Release) {
-	if (req.Values == nil || req.Values.Raw == "" || req.Values.Raw == "{}\n") && current.Config != nil && current.Config.Raw != "" && current.Config.Raw != "{}\n" {
+	if req.ResetValues {
+		// If ResetValues is set, we comletely ignore current.Config.
+		log.Print("Reset values to the chart's original version.")
+		return
+	}
+	// If req.Values is empty, but current. config is not, copy current into the
+	// request.
+	if (req.Values == nil || req.Values.Raw == "" || req.Values.Raw == "{}\n") &&
+		current.Config != nil &&
+		current.Config.Raw != "" &&
+		current.Config.Raw != "{}\n" {
 		log.Printf("Copying values from %s (v%d) to new release.", current.Name, current.Version)
 		req.Values = current.Config
 	}

pkg/tiller/release_server_test.go

@@ -667,6 +667,32 @@ func TestUpdateRelease(t *testing.T) {
 		t.Errorf("Expected release version to be %v, got %v", 2, res.Release.Version)
 	}
 }
+func TestUpdateReleaseResetValues(t *testing.T) {
+	c := helm.NewContext()
+	rs := rsFixture()
+	rel := releaseStub()
+	rs.env.Releases.Create(rel)
+
+	req := &services.UpdateReleaseRequest{
+		Name: rel.Name,
+		Chart: &chart.Chart{
+			Metadata: &chart.Metadata{Name: "hello"},
+			Templates: []*chart.Template{
+				{Name: "templates/hello", Data: []byte("hello: world")},
+				{Name: "templates/hooks", Data: []byte(manifestWithUpgradeHooks)},
+			},
+		},
+		ResetValues: true,
+	}
+	res, err := rs.UpdateRelease(c, req)
+	if err != nil {
+		t.Fatalf("Failed updated: %s", err)
+	}
+	// This should have been unset. Config:  &chart.Config{Raw: `name: value`},
+	if res.Release.Config != nil && res.Release.Config.Raw != "" {
+		t.Errorf("Expected chart config to be empty, got %q", res.Release.Config.Raw)
+	}
+}
 
 func TestUpdateReleaseFailure(t *testing.T) {
 	c := helm.NewContext()