helmExecute: opt out from template parsing (#4511)

Add option to opt out from helm template parsing Co-authored-by: Linda Siebert <linda.siebert@sap.com> Co-authored-by: Alexander Link <33052602+alxsap@users.noreply.github.com>
2025-01-18 05:18:24 +02:00 · 2023-09-08 10:30:30 +02:00 · 2023-09-08 10:30:30 +02:00 · e80adc5ab9
commit e80adc5ab9
parent b58bb87114
4 changed files with 110 additions and 16 deletions
--- a/cmd/helmExecute.go
+++ b/cmd/helmExecute.go
@ -2,6 +2,7 @@ package cmd

 import (
 	"fmt"
+	"os"
 	"path"
 	"path/filepath"

@ -70,20 +71,21 @@ func helmExecute(config helmExecuteOptions, telemetryData *telemetry.CustomData,
 		helmConfig.PublishVersion = artifactInfo.Version
 	}

-	err = parseAndRenderCPETemplate(config, GeneralConfig.EnvRootPath, utils)
-	if err != nil {
-		log.Entry().WithError(err).Fatalf("failed to parse/render template: %v", err)
-	}
-
 	helmExecutor := kubernetes.NewHelmExecutor(helmConfig, utils, GeneralConfig.Verbose, log.Writer())

 	// error situations should stop execution through log.Entry().Fatal() call which leads to an os.Exit(1) in the end
-	if err := runHelmExecute(config, helmExecutor, commonPipelineEnvironment); err != nil {
+	if err := runHelmExecute(config, helmExecutor, utils, commonPipelineEnvironment); err != nil {
 		log.Entry().WithError(err).Fatalf("step execution failed: %v", err)
 	}
 }

-func runHelmExecute(config helmExecuteOptions, helmExecutor kubernetes.HelmExecutor, commonPipelineEnvironment *helmExecuteCommonPipelineEnvironment) error {
+func runHelmExecute(config helmExecuteOptions, helmExecutor kubernetes.HelmExecutor, utils fileHandler, commonPipelineEnvironment *helmExecuteCommonPipelineEnvironment) error {
+	if config.RenderValuesTemplate {
+		err := parseAndRenderCPETemplate(config, GeneralConfig.EnvRootPath, utils)
+		if err != nil {
+			log.Entry().WithError(err).Fatalf("failed to parse/render template: %v", err)
+		}
+	}
 	switch config.HelmCommand {
 	case "upgrade":
 		if err := helmExecutor.RunHelmUpgrade(); err != nil {
@ -147,7 +149,7 @@ func runHelmExecuteDefault(config helmExecuteOptions, helmExecutor kubernetes.He
 }

 // parseAndRenderCPETemplate allows to parse and render a template which contains references to the CPE
-func parseAndRenderCPETemplate(config helmExecuteOptions, rootPath string, utils kubernetes.DeployUtils) error {
+func parseAndRenderCPETemplate(config helmExecuteOptions, rootPath string, utils fileHandler) error {
 	cpe := piperenv.CPEMap{}
 	err := cpe.LoadFromDisk(path.Join(rootPath, "commonPipelineEnvironment"))
 	if err != nil {
@ -187,3 +189,9 @@ func parseAndRenderCPETemplate(config helmExecuteOptions, rootPath string, utils

 	return nil
 }
+
+type fileHandler interface {
+	FileExists(string) (bool, error)
+	FileRead(string) ([]byte, error)
+	FileWrite(string, []byte, os.FileMode) error
+}
--- a/cmd/helmExecute_generated.go
+++ b/cmd/helmExecute_generated.go
@ -48,6 +48,7 @@ type helmExecuteOptions struct {
 	RenderSubchartNotes       bool     `json:"renderSubchartNotes,omitempty"`
 	TemplateStartDelimiter    string   `json:"templateStartDelimiter,omitempty"`
 	TemplateEndDelimiter      string   `json:"templateEndDelimiter,omitempty"`
+	RenderValuesTemplate      bool     `json:"renderValuesTemplate,omitempty"`
 }

 type helmExecuteCommonPipelineEnvironment struct {
@ -236,6 +237,7 @@ func addHelmExecuteFlags(cmd *cobra.Command, stepConfig *helmExecuteOptions) {
 	cmd.Flags().BoolVar(&stepConfig.RenderSubchartNotes, "renderSubchartNotes", true, "If set, render subchart notes along with the parent.")
 	cmd.Flags().StringVar(&stepConfig.TemplateStartDelimiter, "templateStartDelimiter", `{{`, "When templating value files, use this start delimiter.")
 	cmd.Flags().StringVar(&stepConfig.TemplateEndDelimiter, "templateEndDelimiter", `}}`, "When templating value files, use this end delimiter.")
+	cmd.Flags().BoolVar(&stepConfig.RenderValuesTemplate, "renderValuesTemplate", true, "A flag to turn templating value files on or off.")

 	cmd.MarkFlagRequired("image")
 }
@ -634,6 +636,15 @@ func helmExecuteMetadata() config.StepData {
 						Aliases:     []config.Alias{},
 						Default:     `}}`,
 					},
+					{
+						Name:        "renderValuesTemplate",
+						ResourceRef: []config.ResourceReference{},
+						Scope:       []string{"STEPS", "PARAMETERS"},
+						Type:        "bool",
+						Mandatory:   false,
+						Aliases:     []config.Alias{},
+						Default:     true,
+					},
 				},
 			},
 			Containers: []config.Container{
--- a/cmd/helmExecute_test.go
+++ b/cmd/helmExecute_test.go
@ -63,7 +63,7 @@ func TestRunHelmUpgrade(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmUpgrade").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -102,7 +102,7 @@ func TestRunHelmLint(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmLint").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -141,7 +141,7 @@ func TestRunHelmInstall(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmInstall").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -179,7 +179,7 @@ func TestRunHelmTest(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmTest").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -217,7 +217,7 @@ func TestRunHelmUninstall(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmUninstall").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -255,7 +255,7 @@ func TestRunHelmDependency(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmDependency").Return(testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -295,7 +295,7 @@ func TestRunHelmPush(t *testing.T) {
 			helmExecute := &mocks.HelmExecutor{}
 			helmExecute.On("RunHelmPublish").Return(testCase.methodString, testCase.methodError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &fileHandlerMock{}, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
@ -314,6 +314,8 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 		methodPackageError error
 		methodPublishError error
 		expectedErrStr     string
+		fileUtils          fileHandlerMock
+		assertFunc         func(fileHandlerMock) error
 	}{
 		{
 			config: helmExecuteOptions{
@ -322,6 +324,45 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 			methodLintError:    nil,
 			methodPackageError: nil,
 			methodPublishError: nil,
+			fileUtils:          fileHandlerMock{},
+		},
+		{
+			// this test checks if parseAndRenderCPETemplate is called properly
+			// when config.RenderValuesTemplate is true
+			config: helmExecuteOptions{
+				HelmCommand:          "",
+				RenderValuesTemplate: true,
+			},
+			methodLintError:    nil,
+			methodPackageError: nil,
+			methodPublishError: nil,
+			fileUtils:          fileHandlerMock{},
+			// we expect the values file is traversed since parsing and rendering according to cpe template is active
+			assertFunc: func(f fileHandlerMock) error {
+				if len(f.fileExistsCalled) == 1 && f.fileExistsCalled[0] == "/values.yaml" {
+					return nil
+				}
+				return fmt.Errorf("expected FileExists called for ['/values.yaml'] but was: %+v", f.fileExistsCalled)
+			},
+		},
+		{
+			// this test checks if parseAndRenderCPETemplate is NOT called
+			// when config.RenderValuesTemplate is false
+			config: helmExecuteOptions{
+				HelmCommand:          "",
+				RenderValuesTemplate: false,
+			},
+			methodLintError:    nil,
+			methodPackageError: nil,
+			methodPublishError: nil,
+			fileUtils:          fileHandlerMock{},
+			// we expect the values file is not traversed since parsing and rendering according to cpe template is not active
+			assertFunc: func(f fileHandlerMock) error {
+				if len(f.fileExistsCalled) > 0 {
+					return fmt.Errorf("expected FileExists not called, but was for: %+v", f.fileExistsCalled)
+				}
+				return nil
+			},
 		},
 		{
 			config: helmExecuteOptions{
@ -329,6 +370,7 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 			},
 			methodLintError: errors.New("some error"),
 			expectedErrStr:  "failed to execute helm lint: some error",
+			fileUtils:       fileHandlerMock{},
 		},
 		{
 			config: helmExecuteOptions{
@ -336,6 +378,7 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 			},
 			methodPackageError: errors.New("some error"),
 			expectedErrStr:     "failed to execute helm dependency: some error",
+			fileUtils:          fileHandlerMock{},
 		},
 		{
 			config: helmExecuteOptions{
@ -343,6 +386,7 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 			},
 			methodPublishError: errors.New("some error"),
 			expectedErrStr:     "failed to execute helm publish: some error",
+			fileUtils:          fileHandlerMock{},
 		},
 	}

@ -353,10 +397,13 @@ func TestRunHelmDefaultCommand(t *testing.T) {
 			helmExecute.On("RunHelmDependency").Return(testCase.methodPackageError)
 			helmExecute.On("RunHelmPublish").Return(testCase.methodPublishError)

-			err := runHelmExecute(testCase.config, helmExecute, &cpe)
+			err := runHelmExecute(testCase.config, helmExecute, &testCase.fileUtils, &cpe)
 			if err != nil {
 				assert.Equal(t, testCase.expectedErrStr, err.Error())
 			}
+			if testCase.assertFunc != nil {
+				assert.NoError(t, testCase.assertFunc(testCase.fileUtils))
+			}

 		})
 	}
@ -485,3 +532,24 @@ tag: {{ imageTag "test-image" }}
 		})
 	}
 }
+
+type fileHandlerMock struct {
+	fileExistsCalled []string
+	fileReadCalled   []string
+	fileWriteCalled  []string
+}
+
+func (f *fileHandlerMock) FileWrite(name string, content []byte, mode os.FileMode) error {
+	f.fileWriteCalled = append(f.fileWriteCalled, name)
+	return nil
+}
+
+func (f *fileHandlerMock) FileRead(name string) ([]byte, error) {
+	f.fileReadCalled = append(f.fileReadCalled, name)
+	return []byte{}, nil
+}
+
+func (f *fileHandlerMock) FileExists(name string) (bool, error) {
+	f.fileExistsCalled = append(f.fileExistsCalled, name)
+	return true, nil
+}
--- a/resources/metadata/helmExecute.yaml
+++ b/resources/metadata/helmExecute.yaml
@ -360,6 +360,13 @@ spec:
        scope:
          - STEPS
          - PARAMETERS
+      - name: renderValuesTemplate
+        type: bool
+        description: A flag to turn templating value files on or off.
+        default: true
+        scope:
+          - STEPS
+          - PARAMETERS
  containers:
    - image: dtzar/helm-kubectl:3
      workingDir: /config