add lint-mode flag to helm template

Signed-off-by: bennsimon <bennsimonotieno@gmail.com>

pkg/action/action.go

@@ -177,7 +177,7 @@ func splitAndDeannotate(postrendered string) (map[string]string, error) {
 // TODO: As part of the refactor the duplicate code in cmd/helm/template.go should be removed
 //
 //	This code has to do with writing files to disk.
-func (cfg *Configuration) renderResources(ch *chart.Chart, values common.Values, releaseName, outputDir string, subNotes, useReleaseName, includeCrds bool, pr postrenderer.PostRenderer, interactWithRemote, enableDNS, hideSecret bool) ([]*release.Hook, *bytes.Buffer, string, error) {
+func (cfg *Configuration) renderResources(ch *chart.Chart, values common.Values, releaseName, outputDir string, subNotes, useReleaseName, includeCrds bool, pr postrenderer.PostRenderer, interactWithRemote, enableDNS, hideSecret bool, lintMode bool) ([]*release.Hook, *bytes.Buffer, string, error) {
 	var hs []*release.Hook
 	b := bytes.NewBuffer(nil)
 
@@ -213,6 +213,7 @@ func (cfg *Configuration) renderResources(ch *chart.Chart, values common.Values,
 		e.EnableDNS = enableDNS
 		e.CustomTemplateFuncs = cfg.CustomTemplateFuncs
 
+		e.LintMode = lintMode
 		files, err2 = e.Render(ch, values)
 	}
 

pkg/action/install.go

@@ -131,6 +131,8 @@ type Install struct {
 	// Lock to control raceconditions when the process receives a SIGTERM
 	Lock           sync.Mutex
 	goroutineCount atomic.Int32
+	// In LintMode, some 'required' template values may be missing, so don't fail
+	LintMode bool
 }
 
 // ChartPathOptions captures common options used for controlling chart paths
@@ -342,7 +344,7 @@ func (i *Install) RunWithContext(ctx context.Context, chrt *chart.Chart, vals ma
 	rel := i.createRelease(chrt, vals, i.Labels)
 
 	var manifestDoc *bytes.Buffer
-	rel.Hooks, manifestDoc, rel.Info.Notes, err = i.cfg.renderResources(chrt, valuesToRender, i.ReleaseName, i.OutputDir, i.SubNotes, i.UseReleaseName, i.IncludeCRDs, i.PostRenderer, interactWithRemote, i.EnableDNS, i.HideSecret)
+	rel.Hooks, manifestDoc, rel.Info.Notes, err = i.cfg.renderResources(chrt, valuesToRender, i.ReleaseName, i.OutputDir, i.SubNotes, i.UseReleaseName, i.IncludeCRDs, i.PostRenderer, interactWithRemote, i.EnableDNS, i.HideSecret, i.LintMode)
 	// Even for errors, attach this if available
 	if manifestDoc != nil {
 		rel.Manifest = manifestDoc.String()

pkg/action/upgrade.go

@@ -284,7 +284,7 @@ func (u *Upgrade) prepareUpgrade(name string, chart *chart.Chart, vals map[strin
 		interactWithRemote = true
 	}
 
-	hooks, manifestDoc, notesTxt, err := u.cfg.renderResources(chart, valuesToRender, "", "", u.SubNotes, false, false, u.PostRenderer, interactWithRemote, u.EnableDNS, u.HideSecret)
+	hooks, manifestDoc, notesTxt, err := u.cfg.renderResources(chart, valuesToRender, "", "", u.SubNotes, false, false, u.PostRenderer, interactWithRemote, u.EnableDNS, u.HideSecret, false)
 	if err != nil {
 		return nil, nil, false, err
 	}

pkg/cmd/template.go

@@ -203,6 +203,7 @@ func newTemplateCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 	f.StringVar(&kubeVersion, "kube-version", "", "Kubernetes version used for Capabilities.KubeVersion")
 	f.StringSliceVarP(&extraAPIs, "api-versions", "a", []string{}, "Kubernetes api versions used for Capabilities.APIVersions (multiple can be specified)")
 	f.BoolVar(&client.UseReleaseName, "release-name", false, "use release name in the output-dir path.")
+	f.BoolVar(&client.LintMode, "lint-mode", false, "ignore missing 'required' template values.")
 	bindPostRenderFlag(cmd, &client.PostRenderer, settings)
 
 	return cmd