Support Linter for Values

cmd/tiller/release_server.go

@@ -220,33 +220,20 @@ func (s *releaseServer) InstallRelease(c ctx.Context, req *services.InstallRelea
 		return nil, errMissingChart
 	}
 
-	ts := timeconv.Now()
 	name, err := s.uniqName(req.Name)
 	if err != nil {
 		return nil, err
 	}
 
-	overrides := map[string]interface{}{
-		"Release": map[string]interface{}{
-			"Name":      name,
-			"Time":      ts,
-			"Namespace": s.env.Namespace,
-			"Service":   "Tiller",
-		},
-		"Chart": req.Chart.Metadata,
-	}
-
-	// Render the templates
-	// TODO: Fix based on whether chart has `engine: SOMETHING` set.
-	vals, err := chartutil.CoalesceValues(req.Chart, req.Values, nil)
+	ts := timeconv.Now()
+	options := map[string]interface{}{"namespace": s.env.Namespace, "releaseName": name, "releaseTime": ts}
+	valuesToRender, err := chartutil.ToRenderValues(req.Chart, req.Values, options)
 	if err != nil {
 		return nil, err
 	}
 
-	overrides["Values"] = vals
-
 	renderer := s.engine(req.Chart)
-	files, err := renderer.Render(req.Chart, overrides)
+	files, err := renderer.Render(req.Chart, valuesToRender)
 	if err != nil {
 		return nil, err
 	}

pkg/chartutil/values.go

@@ -288,6 +288,27 @@ func coalesceTables(dst, src map[string]interface{}) map[string]interface{} {
 	return dst
 }
 
+// ToRenderValues composes the struct from the data coming from the Releases, Charts and Values files
+func ToRenderValues(chrt *chart.Chart, chrtVals *chart.Config, options map[string]interface{}) (Values, error) {
+	overrides := map[string]interface{}{
+		"Release": map[string]interface{}{
+			"Name":      options["releaseName"],
+			"Time":      options["releaseTime"],
+			"Namespace": options["namespace"],
+			"Service":   "Tiller",
+		},
+		"Chart": chrt.Metadata,
+	}
+
+	vals, err := CoalesceValues(chrt, chrtVals, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	overrides["Values"] = vals
+	return overrides, nil
+}
+
 // istable is a special-purpose function to see if the present thing matches the definition of a YAML table.
 func istable(v interface{}) bool {
 	_, ok := v.(map[string]interface{})

pkg/lint/rules/template.go

@@ -19,17 +19,18 @@ package rules
 import (
 	"bytes"
 	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"text/template"
+
 	"github.com/Masterminds/sprig"
 	"gopkg.in/yaml.v2"
 	"k8s.io/helm/pkg/chartutil"
 	"k8s.io/helm/pkg/engine"
 	"k8s.io/helm/pkg/lint/support"
 	"k8s.io/helm/pkg/timeconv"
-	"os"
-	"path/filepath"
-	"regexp"
-	"strings"
-	"text/template"
 )
 
 func Templates(linter *support.Linter) {
@@ -51,18 +52,9 @@ func Templates(linter *support.Linter) {
 		return
 	}
 
-	// Based on cmd/tiller/release_server.go
-	overrides := map[string]interface{}{
-		"Release": map[string]interface{}{
-			"Name":    "testRelease",
-			"Service": "Tiller",
-			"Time":    timeconv.Now(),
-		},
-		"Chart": chart.Metadata,
-	}
-
-	chartValues, _ := chartutil.CoalesceValues(chart, chart.Values, overrides)
-	renderedContentMap, err := engine.New().Render(chart, chartValues)
+	options := map[string]interface{}{"namespace": "testNamespace", "releaseName": "testRelease", "releaseTime": timeconv.Now()}
+	valuesToRender, err := chartutil.ToRenderValues(chart, chart.Values, options)
+	renderedContentMap, err := engine.New().Render(chart, valuesToRender)
 
 	renderOk := linter.RunLinterRule(support.ErrorSev, validateNoError(err))
 
@@ -88,7 +80,7 @@ func Templates(linter *support.Linter) {
 		}
 
 		// Check that all the templates have a matching value
-		linter.RunLinterRule(support.WarningSev, validateNonMissingValues(fileName, templatesPath, chartValues, preExecutedTemplate))
+		linter.RunLinterRule(support.WarningSev, validateNonMissingValues(fileName, templatesPath, valuesToRender, preExecutedTemplate))
 
 		linter.RunLinterRule(support.WarningSev, validateQuotes(fileName, string(preExecutedTemplate)))
 

pkg/lint/rules/template_test.go

@@ -17,9 +17,12 @@ limitations under the License.
 package rules
 
 import (
-	"k8s.io/helm/pkg/lint/support"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
+
+	"k8s.io/helm/pkg/lint/support"
 )
 
 const templateTestBasedir = "./testdata/albatross"
@@ -73,7 +76,7 @@ func TestValidateQuotes(t *testing.T) {
 
 }
 
-func TestTemplate(t *testing.T) {
+func TestTemplateParsing(t *testing.T) {
 	linter := support.Linter{ChartDir: templateTestBasedir}
 	Templates(&linter)
 	res := linter.Messages
@@ -86,3 +89,22 @@ func TestTemplate(t *testing.T) {
 		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")
+
+// Test a template with all the existing features:
+// namespaces, partial templates
+func TestTemplateIntegrationHappyPath(t *testing.T) {
+	// Rename file so it gets ignored by the linter
+	os.Rename(wrongTemplatePath, ignoredTemplatePath)
+	defer os.Rename(ignoredTemplatePath, wrongTemplatePath)
+
+	linter := support.Linter{ChartDir: templateTestBasedir}
+	Templates(&linter)
+	res := linter.Messages
+
+	if len(res) != 0 {
+		t.Fatalf("Expected no error, got %d, %v", len(res), res)
+	}
+}

pkg/lint/rules/testdata/albatross/templates/_helpers.tpl

@@ -0,0 +1,16 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{define "name"}}{{default "nginx" .Values.nameOverride | trunc 24 }}{{end}}
+
+{{/*
+Create a default fully qualified app name.
+
+We truncate at 24 chars because some Kubernetes name fields are limited to this
+(by the DNS naming spec).
+*/}}
+{{define "fullname"}}
+{{- $name := default "nginx" .Values.nameOverride -}}
+{{printf "%s-%s" .Release.Name $name | trunc 24 -}}
+{{end}}

pkg/lint/rules/testdata/albatross/templates/albatross.yaml

@@ -1,2 +0,0 @@
-metadata:
-  name: {{.name | default "foo" | title}}

pkg/lint/rules/testdata/albatross/templates/svc.yaml

@@ -0,0 +1,18 @@
+# This is a service gateway to the replica set created by the deployment.
+# Take a look at the deployment.yaml for general notes about this chart.
+apiVersion: v1
+kind: Service
+metadata:
+  name: "{{ .Values.name }}"
+  labels:
+    heritage: {{ .Release.Service | quote }}
+    release: {{ .Release.Name | quote }}
+    chart: "{{.Chart.Name}}-{{.Chart.Version}}"
+spec:
+  ports:
+  - port: {{default 80 .Values.httpPort | quote}}
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: {{template "fullname" .}}