Assure all dependencies are present before linting

helm/main.go

@@ -187,7 +187,14 @@ func (h *Helm) Lint(
 	// +optional
 	args []string,
 ) (string, error) {
-	c := h.createContainer(directory)
+	var c *dagger.Container
+
+	if h.hasMissingDependencies(ctx, directory) {
+		c = h.createContainer(directory).WithMountedDirectory("./charts", h.dependencyUpdate(directory))
+	} else {
+		c = h.createContainer(directory)
+	}
+
 	out, err := c.WithExec([]string{"sh", "-c", fmt.Sprintf("%s %s", "helm lint", strings.Join(args, " "))}).Stdout(ctx)
 	if err != nil {
 		return "", err
@@ -196,6 +203,24 @@ func (h *Helm) Lint(
 	return out, nil
 }
 
+func (h *Helm) hasMissingDependencies(
+	// method call context
+	ctx context.Context,
+	// directory that contains the Helm Chart
+	directory *dagger.Directory,
+) bool {
+	_, err := h.createContainer(directory).WithExec([]string{"sh", "-c", "helm dep list | grep missing"}).Stdout(ctx)
+	return err == nil
+}
+
+func (h *Helm) dependencyUpdate(
+	// directory that contains the Helm Chart
+	directory *dagger.Directory,
+) *dagger.Directory {
+	c := h.createContainer(directory)
+	return c.WithExec([]string{"sh", "-c", "helm dep update"}).Directory("charts")
+}
+
 func (h *Helm) createContainer(
 	// directory that contains the Helm Chart
 	directory *dagger.Directory,

tests/main.go

@@ -19,6 +19,7 @@ func (m *Go) All(ctx context.Context) error {
 	p.Go(m.HelmLint)
 	p.Go(m.HelmLintWithArg)
 	p.Go(m.HelmLintWithArgs)
+	p.Go(m.HelmLintWithMissingDependencies)
 
 	return p.Wait()
 }
@@ -123,3 +124,17 @@ func (m *Go) HelmLintWithArgs(
 
 	return nil
 }
+
+func (m *Go) HelmLintWithMissingDependencies(
+	// method call context
+	ctx context.Context,
+) error {
+	directory := dag.CurrentModule().Source().Directory("./testdata/mydependentchart/")
+	_, err := dag.Helm().Lint(ctx, directory)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

tests/testdata/mydependentchart/Chart.yaml

@@ -0,0 +1,30 @@
+apiVersion: v2
+name: dagger-module-helm-test
+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.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.1
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"
+
+# This is an optional list containing all dependencies.
+dependencies:
+  - name: dependency-track
+    version: 1.8.1
+    repository:  https://puzzle.github.io/dependencytrack-helm/