support writing multiple resources to the same file

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

internal/test/test.go

@@ -58,6 +58,17 @@ func AssertGoldenString(t TestingT, actual, filename string) {
 	}
 }
 
+// AssertGoldenFile assers that the content of the actual file matches the contents of the expected file
+func AssertGoldenFile(t TestingT, actualFileName string, expectedFilename string) {
+	t.Helper()
+
+	actual, err := ioutil.ReadFile(actualFileName)
+	if err != nil {
+		t.Fatalf("%v", err)
+	}
+	AssertGoldenBytes(t, actual, expectedFilename)
+}
+
 func path(filename string) string {
 	if filepath.IsAbs(filename) {
 		return filename

pkg/action/action_test.go

@@ -70,6 +70,32 @@ var manifestWithTestHook = `kind: Pod
 	  cmd: fake-command
   `
 
+var rbacManifests = `apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: schedule-agents
+rules:
+- apiGroups: [""]
+  resources: ["pods", "pods/exec", "pods/log"]
+  verbs: ["*"]
+
+---
+
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: schedule-agents
+  namespace: {{ default .Release.Namespace}}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: schedule-agents
+subjects:
+- kind: ServiceAccount
+  name: schedule-agents
+  namespace: {{ .Release.Namespace }}
+`
+
 type chartOptions struct {
 	*chart.Chart
 }
@@ -126,6 +152,15 @@ func withSampleTemplates() chartOption {
 	}
 }
 
+func withMultipleManifestTemplate() chartOption {
+	return func(opts *chartOptions) {
+		sampleTemplates := []*chart.File{
+			{Name: "templates/rbac", Data: []byte(rbacManifests)},
+		}
+		opts.Templates = append(opts.Templates, sampleTemplates...)
+	}
+}
+
 func withKube(version string) chartOption {
 	return func(opts *chartOptions) {
 		opts.Metadata.KubeVersion = version

pkg/action/install.go

@@ -365,22 +365,24 @@ func (c *Configuration) renderResources(ch *chart.Chart, values chartutil.Values
 	}
 
 	// Aggregate all valid manifests into one big doc.
+	fileWritten := make(map[string]bool)
 	for _, m := range manifests {
 		if outputDir == "" {
 			fmt.Fprintf(b, "---\n# Source: %s\n%s\n", m.Name, m.Content)
 		} else {
-			err = writeToFile(outputDir, m.Name, m.Content)
+			err = writeToFile(outputDir, m.Name, m.Content, fileWritten[m.Name])
 			if err != nil {
 				return hs, b, "", err
 			}
+			fileWritten[m.Name] = true
 		}
 	}
 
 	return hs, b, notes, nil
 }
 
-// write the <data> to <output-dir>/<name>
+// write the <data> to <output-dir>/<name>. <append> controls if the file is created or content will be appended
-func writeToFile(outputDir string, name string, data string) error {
+func writeToFile(outputDir string, name string, data string, append bool) error {
 	outfileName := strings.Join([]string{outputDir, name}, string(filepath.Separator))
 
 	err := ensureDirectoryForFile(outfileName)
@@ -388,14 +390,14 @@ func writeToFile(outputDir string, name string, data string) error {
 		return err
 	}
 
-	f, err := os.Create(outfileName)
+	f, err := createOrOpenFile(outfileName, append)
 	if err != nil {
 		return err
 	}
 
 	defer f.Close()
 
-	_, err = f.WriteString(fmt.Sprintf("---\n# Source: %s\n%s", name, data))
+	_, err = f.WriteString(fmt.Sprintf("---\n# Source: %s\n%s\n", name, data))
 
 	if err != nil {
 		return err
@@ -405,6 +407,13 @@ func writeToFile(outputDir string, name string, data string) error {
 	return nil
 }
 
+func createOrOpenFile(filename string, append bool) (*os.File, error) {
+	if append {
+		return os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0600)
+	}
+	return os.Create(filename)
+}
+
 // check if the directory exists to create file. creates if don't exists
 func ensureDirectoryForFile(file string) error {
 	baseDir := path.Dir(file)

pkg/action/install_test.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
+	"helm.sh/helm/internal/test"
 	"helm.sh/helm/pkg/release"
 )
 
@@ -372,7 +373,7 @@ func TestInstallReleaseOutputDir(t *testing.T) {
 
 	instAction.OutputDir = dir
 
-	_, err = instAction.Run(buildChart(withSampleTemplates()))
+	_, err = instAction.Run(buildChart(withSampleTemplates(), withMultipleManifestTemplate()))
 	if err != nil {
 		t.Fatalf("Failed install: %s", err)
 	}
@@ -386,6 +387,11 @@ func TestInstallReleaseOutputDir(t *testing.T) {
 	_, err = os.Stat(filepath.Join(dir, "hello/templates/with-partials"))
 	is.NoError(err)
 
+	_, err = os.Stat(filepath.Join(dir, "hello/templates/rbac"))
+	is.NoError(err)
+
+	test.AssertGoldenFile(t, filepath.Join(dir, "hello/templates/rbac"), "rbac.txt")
+
 	_, err = os.Stat(filepath.Join(dir, "hello/templates/empty"))
 	is.True(os.IsNotExist(err))
 }

pkg/action/testdata/rbac.txt

@@ -0,0 +1,25 @@
+---
+# Source: hello/templates/rbac
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: schedule-agents
+rules:
+- apiGroups: [""]
+  resources: ["pods", "pods/exec", "pods/log"]
+  verbs: ["*"]
+---
+# Source: hello/templates/rbac
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: schedule-agents
+  namespace: spaced
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: schedule-agents
+subjects:
+- kind: ServiceAccount
+  name: schedule-agents
+  namespace: spaced