Merge pull request #922 from prydonius/feat/836-lint-multiple-charts

feat(lint): support linting multiple charts

cmd/helm/lint.go

@@ -51,63 +51,80 @@ func init() {
 	RootCommand.AddCommand(lintCommand)
 }
 
-var errLintNoChart = errors.New("no chart found for linting (missing Chart.yaml)")
-var errLintFailed = errors.New("lint failed")
+var errLintNoChart = errors.New("No chart found for linting (missing Chart.yaml)")
 
 func lintCmd(cmd *cobra.Command, args []string) error {
-	path := "."
+	paths := []string{"."}
 	if len(args) > 0 {
-		path = args[0]
+		paths = args
 	}
 
-	if err := lintChart(path); err != nil {
-		return err
+	var total int
+	var failures int
+	for _, path := range paths {
+		if linter, err := lintChart(path); err != nil {
+			fmt.Println("==> Skipping", path)
+			fmt.Println(err)
+		} else {
+			fmt.Println("==> Linting", path)
+
+			if len(linter.Messages) == 0 {
+				fmt.Println("Lint OK")
+			}
+
+			for _, msg := range linter.Messages {
+				fmt.Println(msg)
+			}
+
+			total = total + 1
+			if linter.HighestSeverity >= support.ErrorSev {
+				failures = failures + 1
+			}
+		}
+		fmt.Println("")
 	}
 
+	msg := fmt.Sprintf("%d chart(s) linted", total)
+	if failures > 0 {
+		return fmt.Errorf("%s, %d chart(s) failed", msg, failures)
+	}
+
+	fmt.Printf("%s, no failures\n", msg)
+
 	return nil
 }
 
-func lintChart(path string) error {
+func lintChart(path string) (support.Linter, error) {
+	var chartPath string
+	linter := support.Linter{}
+
 	if strings.HasSuffix(path, ".tgz") {
 		tempDir, err := ioutil.TempDir("", "helm-lint")
 		if err != nil {
-			return err
+			return linter, err
 		}
 		defer os.RemoveAll(tempDir)
 
 		file, err := os.Open(path)
 		if err != nil {
-			return err
+			return linter, err
 		}
 		defer file.Close()
 
 		if err = chartutil.Expand(tempDir, file); err != nil {
-			return err
+			return linter, err
 		}
 
 		base := strings.Split(filepath.Base(path), "-")[0]
-		path = filepath.Join(tempDir, base)
+		chartPath = filepath.Join(tempDir, base)
+	} else {
+		chartPath = path
 	}
 
 	// Guard: Error out of this is not a chart.
-	if _, err := os.Stat(filepath.Join(path, "Chart.yaml")); err != nil {
-		return errLintNoChart
-	}
-
-	linter := lint.All(path)
-
-	if len(linter.Messages) == 0 {
-		fmt.Println("Lint OK")
-		return nil
-	}
-
-	for _, i := range linter.Messages {
-		fmt.Printf("%s\n", i)
+	if _, err := os.Stat(filepath.Join(chartPath, "Chart.yaml")); err != nil {
+		return linter, errLintNoChart
 	}
 
-	if linter.HighestSeverity == support.ErrorSev {
-		return errLintFailed
-	}
-
-	return nil
+	return lint.All(chartPath), nil
 }

cmd/helm/lint_test.go

@@ -26,11 +26,11 @@ var (
 )
 
 func TestLintChart(t *testing.T) {
-	if err := lintChart(chartDirPath); err != nil {
+	if _, err := lintChart(chartDirPath); err != nil {
 		t.Errorf("%s", err)
 	}
 
-	if err := lintChart(archivedChartPath); err != nil {
+	if _, err := lintChart(archivedChartPath); err != nil {
 		t.Errorf("%s", err)
 	}
 

pkg/lint/lint_test.go

@@ -39,18 +39,18 @@ func TestBadChart(t *testing.T) {
 	var w, e, e2, e3 bool
 	for _, msg := range m {
 		if msg.Severity == support.WarningSev {
-			if strings.Contains(msg.Text, "Directory 'templates/' not found") {
+			if strings.Contains(msg.Err.Error(), "directory not found") {
 				w = true
 			}
 		}
 		if msg.Severity == support.ErrorSev {
-			if strings.Contains(msg.Text, "'version' 0.0.0 is less than or equal to 0") {
+			if strings.Contains(msg.Err.Error(), "version 0.0.0 is less than or equal to 0") {
 				e = true
 			}
-			if strings.Contains(msg.Text, "'name' is required") {
+			if strings.Contains(msg.Err.Error(), "name is required") {
 				e2 = true
 			}
-			if strings.Contains(msg.Text, "'name' and directory do not match") {
+			if strings.Contains(msg.Err.Error(), "directory name (badchartfile) and chart name () must be the same") {
 				e3 = true
 			}
 		}
@@ -65,7 +65,7 @@ func TestInvalidYaml(t *testing.T) {
 	if len(m) != 1 {
 		t.Errorf("All didn't fail with expected errors, got %#v", m)
 	}
-	if !strings.Contains(m[0].Text, "deliberateSyntaxError") {
+	if !strings.Contains(m[0].Err.Error(), "deliberateSyntaxError") {
 		t.Errorf("All didn't have the error for deliberateSyntaxError")
 	}
 }
@@ -75,8 +75,8 @@ func TestBadValues(t *testing.T) {
 	if len(m) != 1 {
 		t.Errorf("All didn't fail with expected errors, got %#v", m)
 	}
-	if !strings.Contains(m[0].Text, "cannot unmarshal") {
-		t.Errorf("All didn't have the error for invalid key format: %s", m[0].Text)
+	if !strings.Contains(m[0].Err.Error(), "cannot unmarshal") {
+		t.Errorf("All didn't have the error for invalid key format: %s", m[0].Err)
 	}
 }
 

pkg/lint/rules/chartfile.go

@@ -17,12 +17,14 @@ limitations under the License.
 package rules
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 
 	"github.com/Masterminds/semver"
+
 	"github.com/asaskevich/govalidator"
 	"k8s.io/helm/pkg/chartutil"
 	"k8s.io/helm/pkg/lint/support"
@@ -31,95 +33,83 @@ import (
 
 // Chartfile runs a set of linter rules related to Chart.yaml file
 func Chartfile(linter *support.Linter) {
-	chartPath := filepath.Join(linter.ChartDir, "Chart.yaml")
+	chartFileName := "Chart.yaml"
+	chartPath := filepath.Join(linter.ChartDir, chartFileName)
 
-	linter.RunLinterRule(support.ErrorSev, validateChartYamlFileExistence(chartPath))
-	linter.RunLinterRule(support.ErrorSev, validateChartYamlNotDirectory(chartPath))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartYamlNotDirectory(chartPath))
 
 	chartFile, err := chartutil.LoadChartfile(chartPath)
-	validChartFile := linter.RunLinterRule(support.ErrorSev, validateChartYamlFormat(err))
+	validChartFile := linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartYamlFormat(err))
 
 	// Guard clause. Following linter rules require a parseable ChartFile
 	if !validChartFile {
 		return
 	}
 
-	linter.RunLinterRule(support.ErrorSev, validateChartName(chartFile))
-	linter.RunLinterRule(support.ErrorSev, validateChartNameDirMatch(linter.ChartDir, chartFile))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartName(chartFile))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartNameDirMatch(linter.ChartDir, chartFile))
 
 	// Chart metadata
-	linter.RunLinterRule(support.ErrorSev, validateChartVersion(chartFile))
-	linter.RunLinterRule(support.ErrorSev, validateChartEngine(chartFile))
-	linter.RunLinterRule(support.ErrorSev, validateChartMaintainer(chartFile))
-	linter.RunLinterRule(support.ErrorSev, validateChartSources(chartFile))
-	linter.RunLinterRule(support.ErrorSev, validateChartHome(chartFile))
-}
-
-// Auxiliar validation methods
-func validateChartYamlFileExistence(chartPath string) (lintError support.LintError) {
-	_, err := os.Stat(chartPath)
-	if err != nil {
-		lintError = fmt.Errorf("Chart.yaml file does not exist")
-	}
-	return
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartVersion(chartFile))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartEngine(chartFile))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartMaintainer(chartFile))
+	linter.RunLinterRule(support.ErrorSev, chartFileName, validateChartSources(chartFile))
 }
 
-func validateChartYamlNotDirectory(chartPath string) (lintError support.LintError) {
+func validateChartYamlNotDirectory(chartPath string) error {
 	fi, err := os.Stat(chartPath)
 
 	if err == nil && fi.IsDir() {
-		lintError = fmt.Errorf("Chart.yaml is a directory")
+		return errors.New("should be a file, not a directory")
 	}
-	return
+	return nil
 }
 
-func validateChartYamlFormat(chartFileError error) (lintError support.LintError) {
+func validateChartYamlFormat(chartFileError error) error {
 	if chartFileError != nil {
-		lintError = fmt.Errorf("Chart.yaml is malformed: %s", chartFileError.Error())
+		return fmt.Errorf("unable to parse YAML\n\t%s", chartFileError.Error())
 	}
-	return
+	return nil
 }
 
-func validateChartName(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartName(cf *chart.Metadata) error {
 	if cf.Name == "" {
-		lintError = fmt.Errorf("Chart.yaml: 'name' is required")
+		return errors.New("name is required")
 	}
-	return
+	return nil
 }
 
-func validateChartNameDirMatch(chartDir string, cf *chart.Metadata) (lintError support.LintError) {
+func validateChartNameDirMatch(chartDir string, cf *chart.Metadata) error {
 	if cf.Name != filepath.Base(chartDir) {
-		lintError = fmt.Errorf("Chart.yaml: 'name' and directory do not match")
+		return fmt.Errorf("directory name (%s) and chart name (%s) must be the same", filepath.Base(chartDir), cf.Name)
 	}
-	return
+	return nil
 }
 
-func validateChartVersion(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartVersion(cf *chart.Metadata) error {
 	if cf.Version == "" {
-		lintError = fmt.Errorf("Chart.yaml: 'version' value is required")
-		return
+		return errors.New("version is required")
 	}
 
 	version, err := semver.NewVersion(cf.Version)
 
 	if err != nil {
-		lintError = fmt.Errorf("Chart.yaml: version '%s' is not a valid SemVer", cf.Version)
-		return
+		return fmt.Errorf("version '%s' is not a valid SemVer", cf.Version)
 	}
 
 	c, err := semver.NewConstraint("> 0")
 	valid, msg := c.Validate(version)
 
 	if !valid && len(msg) > 0 {
-		lintError = fmt.Errorf("Chart.yaml: 'version' %v", msg[0])
+		return fmt.Errorf("version %v", msg[0])
 	}
 
-	return
+	return nil
 }
 
-func validateChartEngine(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartEngine(cf *chart.Metadata) error {
 	if cf.Engine == "" {
-		return
+		return nil
 	}
 
 	keys := make([]string, 0, len(chart.Metadata_Engine_value))
@@ -131,39 +121,38 @@ func validateChartEngine(cf *chart.Metadata) (lintError support.LintError) {
 		}
 
 		if str == cf.Engine {
-			return
+			return nil
 		}
 
 		keys = append(keys, str)
 	}
 
-	lintError = fmt.Errorf("Chart.yaml: engine '%v' not valid. Valid options are %v", cf.Engine, keys)
-	return
+	return fmt.Errorf("engine '%v' not valid. Valid options are %v", cf.Engine, keys)
 }
 
-func validateChartMaintainer(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartMaintainer(cf *chart.Metadata) error {
 	for _, maintainer := range cf.Maintainers {
 		if maintainer.Name == "" {
-			lintError = fmt.Errorf("Chart.yaml: maintainer requires a name")
+			return errors.New("each maintainer requires a name")
 		} else if maintainer.Email != "" && !govalidator.IsEmail(maintainer.Email) {
-			lintError = fmt.Errorf("Chart.yaml: maintainer invalid email")
+			return fmt.Errorf("invalid email '%s' for maintainer '%s'", maintainer.Email, maintainer.Name)
 		}
 	}
-	return
+	return nil
 }
 
-func validateChartSources(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartSources(cf *chart.Metadata) error {
 	for _, source := range cf.Sources {
 		if source == "" || !govalidator.IsRequestURL(source) {
-			lintError = fmt.Errorf("Chart.yaml: 'source' invalid URL %s", source)
+			return fmt.Errorf("invalid source URL '%s'", source)
 		}
 	}
-	return
+	return nil
 }
 
-func validateChartHome(cf *chart.Metadata) (lintError support.LintError) {
+func validateChartHome(cf *chart.Metadata) error {
 	if cf.Home != "" && !govalidator.IsRequestURL(cf.Home) {
-		lintError = fmt.Errorf("Chart.yaml: 'home' invalid URL %s", cf.Home)
+		return fmt.Errorf("invalid home URL '%s'", cf.Home)
 	}
-	return
+	return nil
 }

pkg/lint/rules/chartfile_test.go

@@ -43,18 +43,6 @@ var badChart, chatLoadRrr = chartutil.LoadChartfile(badChartFilePath)
 var goodChart, _ = chartutil.LoadChartfile(goodChartFilePath)
 
 // Validation functions Test
-func TestValidateChartYamlFileExistence(t *testing.T) {
-	err := validateChartYamlFileExistence(nonExistingChartFilePath)
-	if err == nil {
-		t.Errorf("validateChartYamlFileExistence to return a linter error, got no error")
-	}
-
-	err = validateChartYamlFileExistence(badChartFilePath)
-	if err != nil {
-		t.Errorf("validateChartYamlFileExistence to return no error, got a linter error")
-	}
-}
-
 func TestValidateChartYamlNotDirectory(t *testing.T) {
 	_ = os.Mkdir(nonExistingChartFilePath, os.ModePerm)
 	defer os.Remove(nonExistingChartFilePath)
@@ -107,10 +95,10 @@ func TestValidateChartVersion(t *testing.T) {
 		Version  string
 		ErrorMsg string
 	}{
-		{"", "'version' value is required"},
+		{"", "version is required"},
 		{"0", "0 is less than or equal to 0"},
-		{"waps", "is not a valid SemVer"},
-		{"-3", "is not a valid SemVer"},
+		{"waps", "'waps' is not a valid SemVer"},
+		{"-3", "'-3' is not a valid SemVer"},
 	}
 
 	var successTest = []string{"0.0.1", "0.0.1+build", "0.0.1-beta"}
@@ -156,9 +144,9 @@ func TestValidateChartMaintainer(t *testing.T) {
 		Email    string
 		ErrorMsg string
 	}{
-		{"", "", "maintainer requires a name"},
-		{"", "test@test.com", "maintainer requires a name"},
-		{"John Snow", "wrongFormatEmail.com", "maintainer invalid email"},
+		{"", "", "each maintainer requires a name"},
+		{"", "test@test.com", "each maintainer requires a name"},
+		{"John Snow", "wrongFormatEmail.com", "invalid email"},
 	}
 
 	var successTest = []struct {
@@ -192,8 +180,8 @@ func TestValidateChartSources(t *testing.T) {
 	for _, test := range failTest {
 		badChart.Sources = []string{test}
 		err := validateChartSources(badChart)
-		if err == nil || !strings.Contains(err.Error(), "invalid URL") {
-			t.Errorf("validateChartSources(%s) to return \"invalid URL\", got no error", test)
+		if err == nil || !strings.Contains(err.Error(), "invalid source URL") {
+			t.Errorf("validateChartSources(%s) to return \"invalid source URL\", got no error", test)
 		}
 	}
 
@@ -213,8 +201,8 @@ func TestValidateChartHome(t *testing.T) {
 	for _, test := range failTest {
 		badChart.Home = test
 		err := validateChartHome(badChart)
-		if err == nil || !strings.Contains(err.Error(), "invalid URL") {
-			t.Errorf("validateChartHome(%s) to return \"invalid URL\", got no error", test)
+		if err == nil || !strings.Contains(err.Error(), "invalid home URL") {
+			t.Errorf("validateChartHome(%s) to return \"invalid home URL\", got no error", test)
 		}
 	}
 
@@ -236,15 +224,15 @@ func TestChartfile(t *testing.T) {
 		t.Errorf("Expected 3 errors, got %d", len(msgs))
 	}
 
-	if !strings.Contains(msgs[0].Text, "'name' is required") {
-		t.Errorf("Unexpected message 0: %s", msgs[0].Text)
+	if !strings.Contains(msgs[0].Err.Error(), "name is required") {
+		t.Errorf("Unexpected message 0: %s", msgs[0].Err)
 	}
 
-	if !strings.Contains(msgs[1].Text, "'name' and directory do not match") {
-		t.Errorf("Unexpected message 1: %s", msgs[1].Text)
+	if !strings.Contains(msgs[1].Err.Error(), "directory name (badchartfile) and chart name () must be the same") {
+		t.Errorf("Unexpected message 1: %s", msgs[1].Err)
 	}
 
-	if !strings.Contains(msgs[2].Text, "'version' 0.0.0 is less than or equal to 0") {
-		t.Errorf("Unexpected message 2: %s", msgs[2].Text)
+	if !strings.Contains(msgs[2].Err.Error(), "version 0.0.0 is less than or equal to 0") {
+		t.Errorf("Unexpected message 2: %s", msgs[2].Err)
 	}
 }

pkg/lint/rules/template.go

@@ -18,6 +18,7 @@ package rules
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -35,9 +36,10 @@ import (
 
 // Templates lints the templates in the Linter.
 func Templates(linter *support.Linter) {
-	templatesPath := filepath.Join(linter.ChartDir, "templates")
+	path := "templates/"
+	templatesPath := filepath.Join(linter.ChartDir, path)
 
-	templatesDirExist := linter.RunLinterRule(support.WarningSev, validateTemplatesDir(templatesPath))
+	templatesDirExist := linter.RunLinterRule(support.WarningSev, path, validateTemplatesDir(templatesPath))
 
 	// Templates directory is optional for now
 	if !templatesDirExist {
@@ -47,7 +49,7 @@ func Templates(linter *support.Linter) {
 	// Load chart and parse templates, based on tiller/release_server
 	chart, err := chartutil.Load(linter.ChartDir)
 
-	chartLoaded := linter.RunLinterRule(support.ErrorSev, validateNoError(err))
+	chartLoaded := linter.RunLinterRule(support.ErrorSev, path, err)
 
 	if !chartLoaded {
 		return
@@ -63,7 +65,7 @@ func Templates(linter *support.Linter) {
 	}
 	renderedContentMap, err := engine.New().Render(chart, valuesToRender)
 
-	renderOk := linter.RunLinterRule(support.ErrorSev, validateNoError(err))
+	renderOk := linter.RunLinterRule(support.ErrorSev, path, err)
 
 	if !renderOk {
 		return
@@ -78,8 +80,9 @@ func Templates(linter *support.Linter) {
 	*/
 	for _, template := range chart.Templates {
 		fileName, preExecutedTemplate := template.Name, template.Data
+		path = fileName
 
-		linter.RunLinterRule(support.ErrorSev, validateAllowedExtension(fileName))
+		linter.RunLinterRule(support.ErrorSev, path, validateAllowedExtension(fileName))
 
 		// We only apply the following lint rules to yaml files
 		if filepath.Ext(fileName) != ".yaml" {
@@ -87,9 +90,9 @@ func Templates(linter *support.Linter) {
 		}
 
 		// Check that all the templates have a matching value
-		linter.RunLinterRule(support.WarningSev, validateNonMissingValues(fileName, templatesPath, valuesToRender, preExecutedTemplate))
+		linter.RunLinterRule(support.WarningSev, path, validateNoMissingValues(templatesPath, valuesToRender, preExecutedTemplate))
 
-		linter.RunLinterRule(support.WarningSev, validateQuotes(fileName, string(preExecutedTemplate)))
+		linter.RunLinterRule(support.WarningSev, path, validateQuotes(string(preExecutedTemplate)))
 
 		renderedContent := renderedContentMap[fileName]
 		var yamlStruct K8sYamlStruct
@@ -97,30 +100,30 @@ func Templates(linter *support.Linter) {
 		// key will be raised as well
 		err := yaml.Unmarshal([]byte(renderedContent), &yamlStruct)
 
-		validYaml := linter.RunLinterRule(support.ErrorSev, validateYamlContent(fileName, err))
+		validYaml := linter.RunLinterRule(support.ErrorSev, path, validateYamlContent(err))
 
 		if !validYaml {
 			continue
 		}
 
-		linter.RunLinterRule(support.ErrorSev, validateNoNamespace(fileName, yamlStruct))
+		linter.RunLinterRule(support.ErrorSev, path, validateNoNamespace(yamlStruct))
 	}
 }
 
 // Validation functions
-func validateTemplatesDir(templatesPath string) (lintError support.LintError) {
+func validateTemplatesDir(templatesPath string) error {
 	if fi, err := os.Stat(templatesPath); err != nil {
-		lintError = fmt.Errorf("Directory 'templates/' not found")
+		return errors.New("directory not found")
 	} else if err == nil && !fi.IsDir() {
-		lintError = fmt.Errorf("'templates' is not a directory")
+		return errors.New("not a directory")
 	}
-	return
+	return nil
 }
 
 // Validates that go template tags include the quote pipelined function
 // i.e {{ .Foo.bar }} -> {{ .Foo.bar | quote }}
 // {{ .Foo.bar }}-{{ .Foo.baz }} -> "{{ .Foo.bar }}-{{ .Foo.baz }}"
-func validateQuotes(templateName string, templateContent string) (lintError support.LintError) {
+func validateQuotes(templateContent string) error {
 	// {{ .Foo.bar }}
 	r, _ := regexp.Compile(`(?m)(:|-)\s+{{[\w|\.|\s|\']+}}\s*$`)
 	functions := r.FindAllString(templateContent, -1)
@@ -128,8 +131,7 @@ func validateQuotes(templateName string, templateContent string) (lintError supp
 	for _, str := range functions {
 		if match, _ := regexp.MatchString("quote", str); !match {
 			result := strings.Replace(str, "}}", " | quote }}", -1)
-			lintError = fmt.Errorf("templates: \"%s\". Wrap your substitution functions in quotes or use the sprig \"quote\" function: %s -> %s", templateName, str, result)
-			return
+			return fmt.Errorf("wrap substitution functions in quotes or use the sprig \"quote\" function: %s -> %s", str, result)
 		}
 	}
 
@@ -139,29 +141,27 @@ func validateQuotes(templateName string, templateContent string) (lintError supp
 
 	for _, str := range functions {
 		result := strings.Replace(str, str, fmt.Sprintf("\"%s\"", str), -1)
-		lintError = fmt.Errorf("templates: \"%s\". Wrap your substitution functions in quotes: %s -> %s", templateName, str, result)
-		return
+		return fmt.Errorf("wrap substitution functions in quotes: %s -> %s", str, result)
 	}
-	return
+	return nil
 }
 
-func validateAllowedExtension(fileName string) (lintError support.LintError) {
+func validateAllowedExtension(fileName string) error {
 	ext := filepath.Ext(fileName)
 	validExtensions := []string{".yaml", ".tpl"}
 
 	for _, b := range validExtensions {
 		if b == ext {
-			return
+			return nil
 		}
 	}
 
-	lintError = fmt.Errorf("templates: \"%s\" needs to use .yaml or .tpl extensions", fileName)
-	return
+	return fmt.Errorf("file extension '%s' not valid. Valid extensions are .yaml or .tpl", ext)
 }
 
-// validateNonMissingValues checks that all the {{}} functions returns a non empty value (<no value> or "")
+// validateNoMissingValues checks that all the {{}} functions returns a non empty value (<no value> or "")
 // and return an error otherwise.
-func validateNonMissingValues(fileName string, templatesPath string, chartValues chartutil.Values, templateContent []byte) (lintError support.LintError) {
+func validateNoMissingValues(templatesPath string, chartValues chartutil.Values, templateContent []byte) error {
 	// 1 - Load Main and associated templates
 	// Main template that we will parse dynamically
 	tmpl := template.New("tpl").Funcs(sprig.TxtFuncMap())
@@ -188,8 +188,7 @@ func validateNonMissingValues(fileName string, templatesPath string, chartValues
 	for _, str := range functions {
 		newtmpl, err := tmpl.Parse(str)
 		if err != nil {
-			lintError = fmt.Errorf("templates: %s", err.Error())
-			return
+			return err
 		}
 
 		err = newtmpl.ExecuteTemplate(&buf, "tpl", chartValues)
@@ -207,30 +206,23 @@ func validateNonMissingValues(fileName string, templatesPath string, chartValues
 	}
 
 	if len(emptyValues) > 0 {
-		lintError = fmt.Errorf("templates: %s: The following functions are not returning any value %v", fileName, emptyValues)
+		return fmt.Errorf("these substitution functions are returning no value: %v", emptyValues)
 	}
-	return
+	return nil
 }
 
-func validateNoError(readError error) (lintError support.LintError) {
-	if readError != nil {
-		lintError = fmt.Errorf("templates: %s", readError.Error())
-	}
-	return
-}
-
-func validateYamlContent(filePath string, err error) (lintError support.LintError) {
+func validateYamlContent(err error) error {
 	if err != nil {
-		lintError = fmt.Errorf("templates: \"%s\". Wrong YAML content", filePath)
+		return fmt.Errorf("unable to parse YAML\n\t%s", err)
 	}
-	return
+	return nil
 }
 
-func validateNoNamespace(filePath string, yamlStruct K8sYamlStruct) (lintError support.LintError) {
+func validateNoNamespace(yamlStruct K8sYamlStruct) error {
 	if yamlStruct.Metadata.Namespace != "" {
-		lintError = fmt.Errorf("templates: \"%s\". namespace option is currently NOT supported", filePath)
+		return errors.New("namespace option is currently NOT supported")
 	}
-	return
+	return nil
 }
 
 // K8sYamlStruct stubs a Kubernetes YAML file.

pkg/lint/rules/template_test.go

@@ -31,8 +31,8 @@ func TestValidateAllowedExtension(t *testing.T) {
 	var failTest = []string{"/foo", "/test.yml", "/test.toml", "test.yml"}
 	for _, test := range failTest {
 		err := validateAllowedExtension(test)
-		if err == nil || !strings.Contains(err.Error(), "needs to use .yaml or .tpl extension") {
-			t.Errorf("validateAllowedExtension('%s') to return \"needs to use .yaml or .tpl extension\", got no error", test)
+		if err == nil || !strings.Contains(err.Error(), "Valid extensions are .yaml or .tpl") {
+			t.Errorf("validateAllowedExtension('%s') to return \"Valid extensions are .yaml or .tpl\", got no error", test)
 		}
 	}
 	var successTest = []string{"/foo.yaml", "foo.yaml", "foo.tpl", "/foo/bar/baz.yaml"}
@@ -49,7 +49,7 @@ func TestValidateQuotes(t *testing.T) {
 	var failTest = []string{"foo: {{.Release.Service }}", "foo:  {{.Release.Service }}", "- {{.Release.Service }}", "foo: {{default 'Never' .restart_policy}}", "-  {{.Release.Service }} "}
 
 	for _, test := range failTest {
-		err := validateQuotes("testTemplate.yaml", test)
+		err := validateQuotes(test)
 		if err == nil || !strings.Contains(err.Error(), "use the sprig \"quote\" function") {
 			t.Errorf("validateQuotes('%s') to return \"use the sprig \"quote\" function:\", got no error.", test)
 		}
@@ -58,7 +58,7 @@ func TestValidateQuotes(t *testing.T) {
 	var successTest = []string{"foo: {{.Release.Service | quote }}", "foo:  {{.Release.Service | quote }}", "- {{.Release.Service | quote }}", "foo: {{default 'Never' .restart_policy | quote }}", "foo: \"{{ .Release.Service }}\"", "foo: \"{{ .Release.Service }} {{ .Foo.Bar }}\"", "foo: \"{{ default 'Never' .Release.Service }} {{ .Foo.Bar }}\"", "foo:  {{.Release.Service | squote }}"}
 
 	for _, test := range successTest {
-		err := validateQuotes("testTemplate.yaml", test)
+		err := validateQuotes(test)
 		if err != nil {
 			t.Errorf("validateQuotes('%s') to return not error and got \"%s\"", test, err.Error())
 		}
@@ -68,9 +68,9 @@ func TestValidateQuotes(t *testing.T) {
 	failTest = []string{"foo: {{.Release.Service }}-{{ .Release.Bar }}", "foo: {{.Release.Service }} {{ .Release.Bar }}", "- {{.Release.Service }}-{{ .Release.Bar }}", "- {{.Release.Service }}-{{ .Release.Bar }} {{ .Release.Baz }}", "foo: {{.Release.Service | default }}-{{ .Release.Bar }}"}
 
 	for _, test := range failTest {
-		err := validateQuotes("testTemplate.yaml", test)
-		if err == nil || !strings.Contains(err.Error(), "Wrap your substitution functions in quotes") {
-			t.Errorf("validateQuotes('%s') to return \"Wrap your substitution functions in quotes\", got no error", test)
+		err := validateQuotes(test)
+		if err == nil || !strings.Contains(err.Error(), "wrap substitution functions in quotes") {
+			t.Errorf("validateQuotes('%s') to return \"wrap substitution functions in quotes\", got no error", test)
 		}
 	}
 
@@ -85,13 +85,13 @@ func TestTemplateParsing(t *testing.T) {
 		t.Fatalf("Expected one error, got %d, %v", len(res), res)
 	}
 
-	if !strings.Contains(res[0].Text, "deliberateSyntaxError") {
+	if !strings.Contains(res[0].Err.Error(), "deliberateSyntaxError") {
 		t.Errorf("Unexpected error: %s", res[0])
 	}
 }
 
-var wrongTemplatePath string = filepath.Join(templateTestBasedir, "templates", "fail.yaml")
-var ignoredTemplatePath string = filepath.Join(templateTestBasedir, "fail.yaml.ignored")
+var wrongTemplatePath = filepath.Join(templateTestBasedir, "templates", "fail.yaml")
+var ignoredTemplatePath = filepath.Join(templateTestBasedir, "fail.yaml.ignored")
 
 // Test a template with all the existing features:
 // namespaces, partial templates

pkg/lint/rules/values.go

@@ -18,36 +18,38 @@ package rules
 
 import (
 	"fmt"
-	"k8s.io/helm/pkg/chartutil"
-	"k8s.io/helm/pkg/lint/support"
 	"os"
 	"path/filepath"
+
+	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/helm/pkg/lint/support"
 )
 
 // Values lints a chart's values.yaml file.
 func Values(linter *support.Linter) {
-	vf := filepath.Join(linter.ChartDir, "values.yaml")
-	fileExists := linter.RunLinterRule(support.InfoSev, validateValuesFileExistence(linter, vf))
+	file := "values.yaml"
+	vf := filepath.Join(linter.ChartDir, file)
+	fileExists := linter.RunLinterRule(support.InfoSev, file, validateValuesFileExistence(linter, vf))
 
 	if !fileExists {
 		return
 	}
 
-	linter.RunLinterRule(support.ErrorSev, validateValuesFile(linter, vf))
+	linter.RunLinterRule(support.ErrorSev, file, validateValuesFile(linter, vf))
 }
 
-func validateValuesFileExistence(linter *support.Linter, valuesPath string) (lintError support.LintError) {
+func validateValuesFileExistence(linter *support.Linter, valuesPath string) error {
 	_, err := os.Stat(valuesPath)
 	if err != nil {
-		lintError = fmt.Errorf("values.yaml file does not exists")
+		return fmt.Errorf("file does not exist")
 	}
-	return
+	return nil
 }
 
-func validateValuesFile(linter *support.Linter, valuesPath string) (lintError support.LintError) {
+func validateValuesFile(linter *support.Linter, valuesPath string) error {
 	_, err := chartutil.ReadValuesFile(valuesPath)
 	if err != nil {
-		lintError = fmt.Errorf("values.yaml is malformed: %s", err.Error())
+		return fmt.Errorf("unable to parse YAML\n\t%s", err)
 	}
-	return
+	return nil
 }

pkg/lint/support/message.go

@@ -33,14 +33,6 @@ const (
 // sev matches the *Sev states.
 var sev = []string{"UNKNOWN", "INFO", "WARNING", "ERROR"}
 
-// Message is a linting output message
-type Message struct {
-	// Severity is one of the *Sev constants
-	Severity int
-	// Text contains the message text
-	Text string
-}
-
 // Linter encapsulates a linting run of a particular chart.
 type Linter struct {
 	Messages []Message
@@ -49,31 +41,36 @@ type Linter struct {
 	ChartDir        string
 }
 
-// LintError describes an error encountered while linting.
-type LintError interface {
-	error
+// Message describes an error encountered while linting.
+type Message struct {
+	// Severity is one of the *Sev constants
+	Severity int
+	Path     string
+	Err      error
+}
+
+func (m Message) Error() string {
+	return fmt.Sprintf("[%s] %s: %s", sev[m.Severity], m.Path, m.Err.Error())
 }
 
-// String prints a string representation of this Message.
-//
-// Implements fmt.Stringer.
-func (m Message) String() string {
-	return fmt.Sprintf("[%s] %s", sev[m.Severity], m.Text)
+// NewMessage creates a new Message struct
+func NewMessage(severity int, path string, err error) Message {
+	return Message{Severity: severity, Path: path, Err: err}
 }
 
 // RunLinterRule returns true if the validation passed
-func (l *Linter) RunLinterRule(severity int, lintError LintError) bool {
+func (l *Linter) RunLinterRule(severity int, path string, err error) bool {
 	// severity is out of bound
 	if severity < 0 || severity >= len(sev) {
 		return false
 	}
 
-	if lintError != nil {
-		l.Messages = append(l.Messages, Message{Text: lintError.Error(), Severity: severity})
+	if err != nil {
+		l.Messages = append(l.Messages, NewMessage(severity, path, err))
 
 		if severity > l.HighestSeverity {
 			l.HighestSeverity = severity
 		}
 	}
-	return lintError == nil
+	return err == nil
 }

pkg/lint/support/message_test.go

@@ -17,12 +17,12 @@ limitations under the License.
 package support
 
 import (
-	"fmt"
+	"errors"
 	"testing"
 )
 
 var linter = Linter{}
-var lintError LintError = fmt.Errorf("Foobar")
+var errLint = errors.New("lint failed")
 
 func TestRunLinterRule(t *testing.T) {
 	var tests = []struct {
@@ -32,48 +32,48 @@ func TestRunLinterRule(t *testing.T) {
 		ExpectedReturn          bool
 		ExpectedHighestSeverity int
 	}{
-		{InfoSev, lintError, 1, false, InfoSev},
-		{WarningSev, lintError, 2, false, WarningSev},
-		{ErrorSev, lintError, 3, false, ErrorSev},
+		{InfoSev, errLint, 1, false, InfoSev},
+		{WarningSev, errLint, 2, false, WarningSev},
+		{ErrorSev, errLint, 3, false, ErrorSev},
 		// No error so it returns true
 		{ErrorSev, nil, 3, true, ErrorSev},
 		// Retains highest severity
-		{InfoSev, lintError, 4, false, ErrorSev},
+		{InfoSev, errLint, 4, false, ErrorSev},
 		// Invalid severity values
-		{4, lintError, 4, false, ErrorSev},
-		{22, lintError, 4, false, ErrorSev},
-		{-1, lintError, 4, false, ErrorSev},
+		{4, errLint, 4, false, ErrorSev},
+		{22, errLint, 4, false, ErrorSev},
+		{-1, errLint, 4, false, ErrorSev},
 	}
 
 	for _, test := range tests {
-		isValid := linter.RunLinterRule(test.Severity, test.LintError)
+		isValid := linter.RunLinterRule(test.Severity, "chart", test.LintError)
 		if len(linter.Messages) != test.ExpectedMessages {
-			t.Errorf("RunLinterRule(%d, %v), linter.Messages should now have %d message, we got %d", test.Severity, test.LintError, test.ExpectedMessages, len(linter.Messages))
+			t.Errorf("RunLinterRule(%d, \"chart\", %v), linter.Messages should now have %d message, we got %d", test.Severity, test.LintError, test.ExpectedMessages, len(linter.Messages))
 		}
 
 		if linter.HighestSeverity != test.ExpectedHighestSeverity {
-			t.Errorf("RunLinterRule(%d, %v), linter.HighestSeverity should be %d, we got %d", test.Severity, test.LintError, test.ExpectedHighestSeverity, linter.HighestSeverity)
+			t.Errorf("RunLinterRule(%d, \"chart\", %v), linter.HighestSeverity should be %d, we got %d", test.Severity, test.LintError, test.ExpectedHighestSeverity, linter.HighestSeverity)
 		}
 
 		if isValid != test.ExpectedReturn {
-			t.Errorf("RunLinterRule(%d, %v), should have returned %t but returned %t", test.Severity, test.LintError, test.ExpectedReturn, isValid)
+			t.Errorf("RunLinterRule(%d, \"chart\", %v), should have returned %t but returned %t", test.Severity, test.LintError, test.ExpectedReturn, isValid)
 		}
 	}
 }
 
 func TestMessage(t *testing.T) {
-	m := Message{ErrorSev, "Foo"}
-	if m.String() != "[ERROR] Foo" {
-		t.Errorf("Unexpected output: %s", m.String())
+	m := Message{ErrorSev, "Chart.yaml", errors.New("Foo")}
+	if m.Error() != "[ERROR] Chart.yaml: Foo" {
+		t.Errorf("Unexpected output: %s", m.Error())
 	}
 
-	m = Message{WarningSev, "Bar"}
-	if m.String() != "[WARNING] Bar" {
-		t.Errorf("Unexpected output: %s", m.String())
+	m = Message{WarningSev, "templates/", errors.New("Bar")}
+	if m.Error() != "[WARNING] templates/: Bar" {
+		t.Errorf("Unexpected output: %s", m.Error())
 	}
 
-	m = Message{InfoSev, "FooBar"}
-	if m.String() != "[INFO] FooBar" {
-		t.Errorf("Unexpected output: %s", m.String())
+	m = Message{InfoSev, "templates/rc.yaml", errors.New("FooBar")}
+	if m.Error() != "[INFO] templates/rc.yaml: FooBar" {
+		t.Errorf("Unexpected output: %s", m.Error())
 	}
 }

pkg/repo/repo.go

@@ -118,6 +118,7 @@ func (r *ChartRepository) saveIndexFile() error {
 	return ioutil.WriteFile(filepath.Join(r.RootPath, indexPath), index, 0644)
 }
 
+// Index generates an index for the chart repository and writes an index.yaml file
 func (r *ChartRepository) Index() error {
 	if r.IndexFile == nil {
 		r.IndexFile = &IndexFile{Entries: make(map[string]*ChartRef)}