lint: lint all documents in a multi-doc yaml file

Signed-off-by: Nandor Kracser <bonifaido@gmail.com>

pkg/lint/rules/template.go

@@ -20,6 +20,7 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+	"io"
 	"os"
 	"path"
 	"path/filepath"
@@ -27,7 +28,7 @@ import (
 	"strings"
 
 	"github.com/pkg/errors"
-	"sigs.k8s.io/yaml"
+	"k8s.io/apimachinery/pkg/util/yaml"
 
 	"helm.sh/helm/v3/pkg/chart/loader"
 	"helm.sh/helm/v3/pkg/chartutil"
@@ -117,20 +118,30 @@ func Templates(linter *support.Linter, values map[string]interface{}, namespace
 		renderedContent := renderedContentMap[path.Join(chart.Name(), fileName)]
 		if strings.TrimSpace(renderedContent) != "" {
 			linter.RunLinterRule(support.WarningSev, fpath, validateTopIndentLevel(renderedContent))
-			var yamlStruct K8sYamlStruct
-			// Even though K8sYamlStruct only defines a few fields, an error in any other
-			// key will be raised as well
-			err := yaml.Unmarshal([]byte(renderedContent), &yamlStruct)
 
-			if (K8sYamlStruct{}) == yamlStruct {
-				continue
+			decoder := yaml.NewYAMLOrJSONDecoder(strings.NewReader(renderedContent), 4096)
+
+			// Lint all resources if the file contains multiple documents separated by ---
+			for {
+				// Even though K8sYamlStruct only defines a few fields, an error in any other
+				// key will be raised as well
+				var yamlStruct *K8sYamlStruct
+
+				err := decoder.Decode(&yamlStruct)
+				if err == io.EOF {
+					break
+				}
+
+				// If YAML linting fails, we sill progress. So we don't capture the returned state
+				// on this linter run.
+				linter.RunLinterRule(support.ErrorSev, fpath, validateYamlContent(err))
+
+				if yamlStruct != nil {
+					linter.RunLinterRule(support.ErrorSev, fpath, validateMetadataName(yamlStruct))
+					linter.RunLinterRule(support.ErrorSev, fpath, validateNoDeprecations(yamlStruct))
+					linter.RunLinterRule(support.ErrorSev, fpath, validateMatchSelector(yamlStruct, renderedContent))
+				}
 			}
-			// If YAML linting fails, we sill progress. So we don't capture the returned state
-			// on this linter run.
-			linter.RunLinterRule(support.ErrorSev, fpath, validateYamlContent(err))
-			linter.RunLinterRule(support.ErrorSev, fpath, validateMetadataName(&yamlStruct))
-			linter.RunLinterRule(support.ErrorSev, fpath, validateNoDeprecations(&yamlStruct))
-			linter.RunLinterRule(support.ErrorSev, fpath, validateMatchSelector(&yamlStruct, renderedContent))
 		}
 	}
 }

pkg/lint/rules/template_test.go

@@ -107,6 +107,20 @@ func TestV3Fail(t *testing.T) {
 	}
 }
 
+func TestMultiTemplateFail(t *testing.T) {
+	linter := support.Linter{ChartDir: "./testdata/multi-template-fail"}
+	Templates(&linter, values, namespace, strict)
+	res := linter.Messages
+
+	if len(res) != 1 {
+		t.Fatalf("Expected 1 error, got %d, %v", len(res), res)
+	}
+
+	if !strings.Contains(res[0].Err.Error(), "object name does not conform to Kubernetes naming requirements") {
+		t.Errorf("Unexpected error: %s", res[0].Err)
+	}
+}
+
 func TestValidateMetadataName(t *testing.T) {
 	names := map[string]bool{
 		"":                          false,

pkg/lint/rules/testdata/multi-template-fail/Chart.yaml

@@ -0,0 +1,21 @@
+apiVersion: v2
+name: multi-template-fail
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application.
+appVersion: 1.16.0

pkg/lint/rules/testdata/multi-template-fail/templates/multi-fail.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: game-config
+data:
+  game.properties: cheat
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: -this:name-is-not_valid$
+data:
+  game.properties: empty