New Chart linter structure

Fixed tests

Adding chart name linter

Add lint error

Moving to blocks

Moving to method

Moved lint rules to functions

Semantic version validation

Linting engine

Adding sources and home validations

Sharing file loading

Sharing file loading

Rolling back readme

Rewriting other linters

Fixing tests

Typo

Using chart.Metadata

Fixing format

Adding UNKNOWN in Engine

Adding tabs

Fixing tabs

_proto/hapi/chart/metadata.proto

@@ -17,6 +17,10 @@ message Maintainer {
 //
 // 	Spec: https://k8s.io/helm/blob/master/docs/design/chart_format.md#the-chart-file
 message Metadata {
+	enum Engine {
+		UNKNOWN = 0;
+		GOTPL = 1;
+	}
 	// The name of the chart
 	string name = 1;
 

cmd/helm/lint.go

@@ -45,6 +45,11 @@ func lintCmd(cmd *cobra.Command, args []string) error {
 	}
 
 	issues := lint.All(path)
+
+	if len(issues) == 0 {
+		fmt.Println("Lint OK")
+	}
+
 	for _, i := range issues {
 		fmt.Printf("%s\n", i)
 	}

docs/examples/alpine/Chart.yaml

@@ -4,5 +4,3 @@ version: 0.1.0
 home: https://k8s.io/helm
 sources:
   - https://github.com/kubernetes/helm
-
-

glide.lock

@@ -5,6 +5,8 @@ imports:
   version: 75cd24fc2f2c
 - name: github.com/aokoli/goutils
   version: 9c37978a95bd5c709a15883b6242714ea6709e64
+- name: github.com/asaskevich/govalidator
+  version: df81827fdd59d8b4fb93d8910b286ab7a3919520
 - name: github.com/beorn7/perks
   version: b965b613227fddccbfffe13eae360ed3fa822f8d
   subpackages:

glide.yaml

@@ -38,3 +38,4 @@ import:
 - package: speter.net/go/exp/math/dec/inf
   repo: https://github.com/go-inf/inf.git
   vcs: git
+- package: github.com/asaskevich/govalidator

pkg/lint/chartfile.go

-package lint
-
-import (
-	"os"
-	"path/filepath"
-
-	"k8s.io/helm/pkg/chartutil"
-)
-
-// Chartfile checks the Chart.yaml file for errors and warnings.
-func Chartfile(basepath string) (m []Message) {
-	m = []Message{}
-
-	path := filepath.Join(basepath, "Chart.yaml")
-	if fi, err := os.Stat(path); err != nil {
-		m = append(m, Message{Severity: ErrorSev, Text: "Chart.yaml file: " + path + " does not exist"})
-		return
-	} else if fi.IsDir() {
-		m = append(m, Message{Severity: ErrorSev, Text: "Chart.yaml is a directory."})
-		return
-	}
-
-	cf, err := chartutil.LoadChartfile(path)
-	if err != nil {
-		m = append(m, Message{
-			Severity: ErrorSev,
-			Text:     err.Error(),
-		})
-		return
-	}
-
-	if cf.Name == "" {
-		m = append(m, Message{
-			Severity: ErrorSev,
-			Text:     "Chart.yaml: 'name' is required",
-		})
-	}
-
-	if cf.Version == "" || cf.Version == "0.0.0" {
-		m = append(m, Message{
-			Severity: ErrorSev,
-			Text:     "Chart.yaml: 'version' is required, and must be greater than 0.0.0",
-		})
-	}
-	return
-}

pkg/lint/lint.go

 package lint
 
+import (
+	"k8s.io/helm/pkg/lint/rules"
+	"k8s.io/helm/pkg/lint/support"
+	"os"
+	"path/filepath"
+)
+
 // All runs all of the available linters on the given base directory.
-func All(basedir string) []Message {
-	out := Chartfile(basedir)
-	out = append(out, Templates(basedir)...)
-	out = append(out, Values(basedir)...)
-	return out
+func All(basedir string) []support.Message {
+	// Using abs path to get directory context
+	current, _ := os.Getwd()
+	chartDir := filepath.Join(current, basedir)
+
+	linter := support.Linter{ChartDir: chartDir}
+	rules.Chartfile(&linter)
+	rules.Values(&linter)
+	rules.Templates(&linter)
+	return linter.Messages
 }

pkg/lint/lint_test.go

 package lint
 
 import (
+	"k8s.io/helm/pkg/lint/support"
 	"strings"
 
 	"testing"
 )
 
-const badChartDir = "testdata/badchartfile"
-const badValuesFileDir = "testdata/badvaluesfile"
-const badYamlFileDir = "testdata/albatross"
-const goodChartDir = "testdata/goodone"
+const badChartDir = "rules/testdata/badchartfile"
+const badValuesFileDir = "rules/testdata/badvaluesfile"
+const badYamlFileDir = "rules/testdata/albatross"
+const goodChartDir = "rules/testdata/goodone"
 
 func TestBadChart(t *testing.T) {
 	m := All(badChartDir)
-	if len(m) != 3 {
+	if len(m) != 4 {
+		t.Errorf("Number of errors %v", len(m))
 		t.Errorf("All didn't fail with expected errors, got %#v", m)
 	}
 	// There should be 2 WARNINGs and one ERROR messages, check for them
-	var w, e, e2 = false, false, false
+	var w, e, e2, e3 bool
 	for _, msg := range m {
-		if msg.Severity == WarningSev {
-			if strings.Contains(msg.Text, "No templates") {
+		if msg.Severity == support.WarningSev {
+			if strings.Contains(msg.Text, "Templates directory not found") {
 				w = true
 			}
 		}
-		if msg.Severity == ErrorSev {
-			if strings.Contains(msg.Text, "must be greater than 0.0.0") {
+		if msg.Severity == support.ErrorSev {
+			if strings.Contains(msg.Text, "'version' 0.0.0 is less than or equal to 0") {
 				e = true
 			}
 			if strings.Contains(msg.Text, "'name' is required") {
 				e2 = true
 			}
+			if strings.Contains(msg.Text, "'name' and directory do not match") {
+				e3 = true
+			}
 		}
 	}
-	if !e || !e2 || !w {
+	if !e || !e2 || !e3 || !w {
 		t.Errorf("Didn't find all the expected errors, got %#v", m)
 	}
 }

pkg/lint/rules/chartfile.go

+package rules
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/Masterminds/semver"
+	"github.com/asaskevich/govalidator"
+	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/helm/pkg/lint/support"
+	"k8s.io/helm/pkg/proto/hapi/chart"
+)
+
+// Chartfile runs a set of linter rules related to Chart.yaml file
+func Chartfile(linter *support.Linter) {
+	chartPath := filepath.Join(linter.ChartDir, "Chart.yaml")
+
+	linter.RunLinterRule(support.ErrorSev, validateChartYamlFileExistence(linter, chartPath))
+	linter.RunLinterRule(support.ErrorSev, validateChartYamlNotDirectory(linter, chartPath))
+
+	chartFile, err := chartutil.LoadChartfile(chartPath)
+	validChartFile := linter.RunLinterRule(support.ErrorSev, validateChartYamlFormat(linter, err))
+
+	// Guard clause. Following linter rules require a parseable ChartFile
+	if !validChartFile {
+		return
+	}
+
+	linter.RunLinterRule(support.ErrorSev, validateChartName(linter, chartFile))
+	linter.RunLinterRule(support.ErrorSev, validateChartNameDirMatch(linter, chartFile))
+
+	// Chart metadata
+	linter.RunLinterRule(support.ErrorSev, validateChartVersion(linter, chartFile))
+	linter.RunLinterRule(support.ErrorSev, validateChartEngine(linter, chartFile))
+	linter.RunLinterRule(support.ErrorSev, validateChartMaintainer(linter, chartFile))
+	linter.RunLinterRule(support.ErrorSev, validateChartSources(linter, chartFile))
+	linter.RunLinterRule(support.ErrorSev, validateChartHome(linter, chartFile))
+}
+
+// Auxiliar validation methods
+func validateChartYamlFileExistence(linter *support.Linter, chartPath string) (lintError support.LintError) {
+	_, err := os.Stat(chartPath)
+	if err != nil {
+		lintError = fmt.Errorf("Chart.yaml file does not exists")
+	}
+	return
+}
+
+func validateChartYamlNotDirectory(linter *support.Linter, chartPath string) (lintError support.LintError) {
+	fi, err := os.Stat(chartPath)
+
+	if err == nil && fi.IsDir() {
+		lintError = fmt.Errorf("Chart.yaml is a directory")
+	}
+	return
+}
+
+func validateChartYamlFormat(linter *support.Linter, chartFileError error) (lintError support.LintError) {
+	if chartFileError != nil {
+		lintError = fmt.Errorf("Chart.yaml is malformed: %s", chartFileError.Error())
+	}
+	return
+}
+
+func validateChartName(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	if cf.Name == "" {
+		lintError = fmt.Errorf("Chart.yaml: 'name' is required")
+	}
+	return
+}
+
+func validateChartNameDirMatch(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	if cf.Name != filepath.Base(linter.ChartDir) {
+		lintError = fmt.Errorf("Chart.yaml: 'name' and directory do not match")
+	}
+	return
+}
+
+func validateChartVersion(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	if cf.Version == "" {
+		lintError = fmt.Errorf("Chart.yaml: 'version' value is required")
+		return
+	}
+
+	version, err := semver.NewVersion(cf.Version)
+
+	if err != nil {
+		lintError = fmt.Errorf("Chart.yaml: version '%s' is not a valid SemVer", cf.Version)
+		return
+	}
+
+	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
+}
+
+func validateChartEngine(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	if cf.Engine == "" {
+		return
+	}
+
+	keys := make([]string, 0, len(chart.Metadata_Engine_value))
+	for engine := range chart.Metadata_Engine_value {
+		str := strings.ToLower(engine)
+
+		if str == "unknown" {
+			continue
+		}
+
+		if str == cf.Engine {
+			return
+		}
+
+		keys = append(keys, str)
+	}
+
+	lintError = fmt.Errorf("Chart.yaml: 'engine %v not valid. Valid options are %v", cf.Engine, keys)
+	return
+}
+
+func validateChartMaintainer(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	for _, maintainer := range cf.Maintainers {
+		if maintainer.Name == "" {
+			lintError = fmt.Errorf("Chart.yaml: maintainer requires a name")
+		} else if maintainer.Email != "" && !govalidator.IsEmail(maintainer.Email) {
+			lintError = fmt.Errorf("Chart.yaml: maintainer invalid email")
+		}
+	}
+	return
+}
+
+func validateChartSources(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	for _, source := range cf.Sources {
+		if source == "" || !govalidator.IsRequestURL(source) {
+			lintError = fmt.Errorf("Chart.yaml: 'source' invalid URL %s", source)
+		}
+	}
+	return
+}
+
+func validateChartHome(linter *support.Linter, cf *chart.Metadata) (lintError support.LintError) {
+	if cf.Home != "" && !govalidator.IsRequestURL(cf.Home) {
+		lintError = fmt.Errorf("Chart.yaml: 'home' invalid URL %s", cf.Home)
+	}
+	return
+}

pkg/lint/chartfile_test.go → pkg/lint/rules/chartfile_test.go

-package lint
+package rules
 
 import (
+	"k8s.io/helm/pkg/lint/support"
+	"strings"
 	"testing"
 )
 
 const badchartfile = "testdata/badchartfile"
 
 func TestChartfile(t *testing.T) {
-	msgs := Chartfile(badchartfile)
-	if len(msgs) != 2 {
-		t.Errorf("Expected 2 errors, got %d", len(msgs))
+	linter := support.Linter{ChartDir: badchartfile}
+	Chartfile(&linter)
+	msgs := linter.Messages
+
+	if len(msgs) != 3 {
+		t.Errorf("Expected 3 errors, got %d", len(msgs))
 	}
 
-	if msgs[0].Text != "Chart.yaml: 'name' is required" {
+	if !strings.Contains(msgs[0].Text, "'name' is required") {
 		t.Errorf("Unexpected message 0: %s", msgs[0].Text)
 	}
 
-	if msgs[1].Text != "Chart.yaml: 'version' is required, and must be greater than 0.0.0" {
+	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[2].Text, "'version' 0.0.0 is less than or equal to 0") {
+		t.Errorf("Unexpected message 2: %s", msgs[2].Text)
+	}
 }

pkg/lint/rules/template.go

+package rules
+
+import (
+	"fmt"
+	"github.com/Masterminds/sprig"
+	"io/ioutil"
+	"k8s.io/helm/pkg/lint/support"
+	"os"
+	"path/filepath"
+	"text/template"
+)
+
+// Templates lints a chart's templates.
+func Templates(linter *support.Linter) {
+	templatespath := filepath.Join(linter.ChartDir, "templates")
+
+	templatesExist := linter.RunLinterRule(support.WarningSev, validateTemplatesExistence(linter, templatespath))
+
+	// Templates directory is optional for now
+	if !templatesExist {
+		return
+	}
+
+	linter.RunLinterRule(support.ErrorSev, validateTemplatesDir(linter, templatespath))
+	linter.RunLinterRule(support.ErrorSev, validateTemplatesParseable(linter, templatespath))
+}
+
+func validateTemplatesExistence(linter *support.Linter, templatesPath string) (lintError support.LintError) {
+	if _, err := os.Stat(templatesPath); err != nil {
+		lintError = fmt.Errorf("Templates directory not found")
+	}
+	return
+}
+
+func validateTemplatesDir(linter *support.Linter, templatesPath string) (lintError support.LintError) {
+	fi, err := os.Stat(templatesPath)
+	if err == nil && !fi.IsDir() {
+		lintError = fmt.Errorf("'templates' is not a directory")
+	}
+	return
+}
+
+func validateTemplatesParseable(linter *support.Linter, templatesPath string) (lintError support.LintError) {
+	tpl := template.New("tpl").Funcs(sprig.TxtFuncMap())
+
+	lintError = filepath.Walk(templatesPath, func(name string, fi os.FileInfo, e error) error {
+		if e != nil {
+			return e
+		}
+		if fi.IsDir() {
+			return nil
+		}
+
+		data, err := ioutil.ReadFile(name)
+		if err != nil {
+			lintError = fmt.Errorf("cannot read %s: %s", name, err)
+			return lintError
+		}
+
+		newtpl, err := tpl.Parse(string(data))
+		if err != nil {
+			lintError = fmt.Errorf("error processing %s: %s", name, err)
+			return lintError
+		}
+		tpl = newtpl
+		return nil
+	})
+
+	return
+}

pkg/lint/template_test.go → pkg/lint/rules/template_test.go

-package lint
+package rules
 
 import (
+	"k8s.io/helm/pkg/lint/support"
 	"strings"
 	"testing"
 )
@@ -8,10 +9,12 @@ import (
 const templateTestBasedir = "./testdata/albatross"
 
 func TestTemplate(t *testing.T) {
-	res := Templates(templateTestBasedir)
+	linter := support.Linter{ChartDir: templateTestBasedir}
+	Templates(&linter)
+	res := linter.Messages
 
 	if len(res) != 1 {
-		t.Fatalf("Expected one error, got %d", len(res))
+		t.Fatalf("Expected one error, got %d, %v", len(res), res)
 	}
 
 	if !strings.Contains(res[0].Text, "deliberateSyntaxError") {

pkg/lint/rules/values.go

+package rules
+
+import (
+	"fmt"
+	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/helm/pkg/lint/support"
+	"os"
+	"path/filepath"
+)
+
+// 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))
+
+	if !fileExists {
+		return
+	}
+
+	linter.RunLinterRule(support.ErrorSev, validateValuesFile(linter, vf))
+}
+
+func validateValuesFileExistence(linter *support.Linter, valuesPath string) (lintError support.LintError) {
+	_, err := os.Stat(valuesPath)
+	if err != nil {
+		lintError = fmt.Errorf("values.yaml file does not exists")
+	}
+	return
+}
+
+func validateValuesFile(linter *support.Linter, valuesPath string) (lintError support.LintError) {
+	_, err := chartutil.ReadValuesFile(valuesPath)
+	if err != nil {
+		lintError = fmt.Errorf("values.yaml is malformed: %s", err.Error())
+	}
+	return
+}

pkg/lint/doc.go → pkg/lint/support/doc.go

@@ -3,4 +3,4 @@
 Linting is the process of testing charts for errors or warnings regarding
 formatting, compilation, or standards compliance.
 */
-package lint
+package support

pkg/lint/message.go → pkg/lint/support/message.go

-package lint
+package support
 
 import "fmt"
 
@@ -22,14 +22,33 @@ 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
+	Severity Severity
 	// Text contains the message text
 	Text string
 }
 
+type Linter struct {
+	Messages []Message
+	ChartDir string
+}
+
+type LintError interface {
+	error
+}
+
+type ValidationFunc func(*Linter) LintError
+
 // 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)
 }
+
+// Returns true if the validation passed
+func (l *Linter) RunLinterRule(severity Severity, lintError LintError) bool {
+	if lintError != nil {
+		l.Messages = append(l.Messages, Message{Text: lintError.Error(), Severity: severity})
+	}
+	return lintError == nil
+}

pkg/lint/message_test.go → pkg/lint/support/message_test.go

-package lint
+package support
 
 import (
 	"fmt"

pkg/lint/template.go

-package lint
-
-import (
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"text/template"
-
-	"github.com/Masterminds/sprig"
-)
-
-// Templates lints a chart's templates.
-func Templates(basepath string) (messages []Message) {
-	messages = []Message{}
-	path := filepath.Join(basepath, "templates")
-	if fi, err := os.Stat(path); err != nil {
-		messages = append(messages, Message{Severity: WarningSev, Text: "No templates"})
-		return
-	} else if !fi.IsDir() {
-		messages = append(messages, Message{Severity: ErrorSev, Text: "'templates' is not a directory"})
-		return
-	}
-
-	tpl := template.New("tpl").Funcs(sprig.TxtFuncMap())
-
-	err := filepath.Walk(basepath, func(name string, fi os.FileInfo, e error) error {
-		// If an error is returned, we fail. Non-fatal errors should just be
-		// added directly to messages.
-		if e != nil {
-			return e
-		}
-		if fi.IsDir() {
-			return nil
-		}
-
-		data, err := ioutil.ReadFile(name)
-		if err != nil {
-			messages = append(messages, Message{
-				Severity: ErrorSev,
-				Text:     fmt.Sprintf("cannot read %s: %s", name, err),
-			})
-			return nil
-		}
-
-		// An error rendering a file should emit a warning.
-		newtpl, err := tpl.Parse(string(data))
-		if err != nil {
-			messages = append(messages, Message{
-				Severity: ErrorSev,
-				Text:     fmt.Sprintf("error processing %s: %s", name, err),
-			})
-			return nil
-		}
-		tpl = newtpl
-		return nil
-	})
-
-	if err != nil {
-		messages = append(messages, Message{Severity: ErrorSev, Text: err.Error()})
-	}
-
-	return
-}

pkg/lint/values.go

-package lint
-
-import (
-	"os"
-	"path/filepath"
-
-	"k8s.io/helm/pkg/chartutil"
-)
-
-// Values lints a chart's values.yaml file.
-func Values(basepath string) (messages []Message) {
-	vf := filepath.Join(basepath, "values.yaml")
-	messages = []Message{}
-	if _, err := os.Stat(vf); err != nil {
-		messages = append(messages, Message{Severity: InfoSev, Text: "No values.yaml file"})
-		return
-	}
-	_, err := chartutil.ReadValuesFile(vf)
-	if err != nil {
-		messages = append(messages, Message{Severity: ErrorSev, Text: err.Error()})
-	}
-	return messages
-}

pkg/proto/hapi/chart/metadata.pb.go

@@ -13,6 +13,27 @@ var _ = proto.Marshal
 var _ = fmt.Errorf
 var _ = math.Inf
 
+type Metadata_Engine int32
+
+const (
+	Metadata_UNKNOWN Metadata_Engine = 0
+	Metadata_GOTPL   Metadata_Engine = 1
+)
+
+var Metadata_Engine_name = map[int32]string{
+	0: "UNKNOWN",
+	1: "GOTPL",
+}
+var Metadata_Engine_value = map[string]int32{
+	"UNKNOWN": 0,
+	"GOTPL":   1,
+}
+
+func (x Metadata_Engine) String() string {
+	return proto.EnumName(Metadata_Engine_name, int32(x))
+}
+func (Metadata_Engine) EnumDescriptor() ([]byte, []int) { return fileDescriptor2, []int{1, 0} }
+
 // Maintainer describes a Chart maintainer.
 type Maintainer struct {
 	// Name is a user name or organization name
@@ -63,23 +84,26 @@ func (m *Metadata) GetMaintainers() []*Maintainer {
 func init() {
 	proto.RegisterType((*Maintainer)(nil), "hapi.chart.Maintainer")
 	proto.RegisterType((*Metadata)(nil), "hapi.chart.Metadata")
+	proto.RegisterEnum("hapi.chart.Metadata_Engine", Metadata_Engine_name, Metadata_Engine_value)
 }
 
 var fileDescriptor2 = []byte{
-	// 234 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x6c, 0x90, 0xbd, 0x4f, 0xc3, 0x40,
-	0x0c, 0xc5, 0x15, 0xda, 0x7c, 0xe0, 0x6c, 0x16, 0xaa, 0x0c, 0x53, 0xd4, 0x89, 0x29, 0x95, 0x40,
-	0x42, 0xcc, 0xec, 0x5d, 0x3a, 0xb2, 0x99, 0xc4, 0x22, 0x27, 0x48, 0x2e, 0xba, 0x3b, 0x40, 0xfc,
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