feature(cmd): `helm dep list` with transitive dependencies

Signed-off-by: Yonatan Kahana <yonatankahana.il@gmail.com>

cmd/helm/dependency.go

@@ -100,7 +100,7 @@ func newDependencyCmd(out io.Writer) *cobra.Command {
 
 func newDependencyListCmd(out io.Writer) *cobra.Command {
 	client := action.NewDependency()
-
+	var transitive *bool
 	cmd := &cobra.Command{
 		Use:     "list CHART",
 		Aliases: []string{"ls"},
@@ -112,8 +112,11 @@ func newDependencyListCmd(out io.Writer) *cobra.Command {
 			if len(args) > 0 {
 				chartpath = filepath.Clean(args[0])
 			}
-			return client.List(chartpath, out)
+			return client.List(chartpath, out, *transitive)
 		},
 	}
+
+	transitive = cmd.Flags().Bool("transitive", false, "show transitive dependencies (dependencies of dependencies)")
+
 	return cmd
 }

pkg/action/dependency.go

@@ -44,7 +44,7 @@ func NewDependency() *Dependency {
 }
 
 // List executes 'helm dependency list'.
-func (d *Dependency) List(chartpath string, out io.Writer) error {
+func (d *Dependency) List(chartpath string, out io.Writer, transitive bool) error {
 	c, err := loader.Load(chartpath)
 	if err != nil {
 		return err
@@ -55,7 +55,17 @@ func (d *Dependency) List(chartpath string, out io.Writer) error {
 		return nil
 	}
 
-	d.printDependencies(chartpath, out, c)
+	table := uitable.New()
+	table.MaxColWidth = 80
+	table.AddRow("NAME", "VERSION", "REPOSITORY", "STATUS")
+
+	d.printDependencies(table, chartpath, c)
+
+	if transitive {
+		d.printTransitiveDependencies(table, c)
+	}
+
+	fmt.Fprintln(out, table)
 	fmt.Fprintln(out)
 	d.printMissing(chartpath, out, c.Metadata.Dependencies)
 	return nil
@@ -138,14 +148,23 @@ func (d *Dependency) dependencyStatus(chartpath string, dep *chart.Dependency, p
 }
 
 // printDependencies prints all of the dependencies in the yaml file.
-func (d *Dependency) printDependencies(chartpath string, out io.Writer, c *chart.Chart) {
-	table := uitable.New()
-	table.MaxColWidth = 80
-	table.AddRow("NAME", "VERSION", "REPOSITORY", "STATUS")
+func (d *Dependency) printDependencies(table *uitable.Table, chartpath string, c *chart.Chart) {
 	for _, row := range c.Metadata.Dependencies {
 		table.AddRow(row.Name, row.Version, row.Repository, d.dependencyStatus(chartpath, row, c))
 	}
-	fmt.Fprintln(out, table)
+}
+
+// printTransitiveDependencies prints all the transitive dependencies in a given chart.
+func (d *Dependency) printTransitiveDependencies(table *uitable.Table, c *chart.Chart) {
+	for _, sc := range c.Dependencies() {
+		if sc.Lock != nil {
+			for _, td := range sc.Lock.Dependencies {
+				table.AddRow(td.Name, td.Version, td.Repository, "transitive")
+			}
+		}
+
+		d.printTransitiveDependencies(table, sc)
+	}
 }
 
 // printMissing prints warnings about charts that are present on disk, but are

pkg/action/dependency_test.go

@@ -27,6 +27,7 @@ func TestList(t *testing.T) {
 	for _, tcase := range []struct {
 		chart      string
 		golden     string
+		transitive bool
 	}{
 		{
 			chart:  "testdata/charts/chart-with-compressed-dependencies",
@@ -48,9 +49,14 @@ func TestList(t *testing.T) {
 			chart:  "testdata/charts/chart-missing-deps",
 			golden: "output/missing-deps.txt",
 		},
+		{
+			chart:      "testdata/charts/transitive-dependencies",
+			golden:     "output/transitive-dependencies.txt",
+			transitive: true,
+		},
 	} {
 		buf := bytes.Buffer{}
-		if err := NewDependency().List(tcase.chart, &buf); err != nil {
+		if err := NewDependency().List(tcase.chart, &buf, tcase.transitive); err != nil {
 			t.Fatal(err)
 		}
 		test.AssertGoldenBytes(t, buf.Bytes(), tcase.golden)

pkg/action/testdata/charts/transitive-dependencies/Chart.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+appVersion: "1.0"
+description: A Helm chart
+name: my-chart
+version: 0.1.0
+dependencies:
+- name: wordpress
+  version: 5.0.2
+  repository: https://kubernetes-charts.storage.googleapis.com

pkg/action/testdata/charts/transitive-dependencies/requirements.lock

@@ -0,0 +1,6 @@
+dependencies:
+- name: wordpress
+  repository: https://kubernetes-charts.storage.googleapis.com
+  version: 5.0.2
+digest: sha256:47874170647e0698d5fc4cb23bbc97e3e2bf80d841cffa0a2fb2688aa4a35372
+generated: "2020-05-21T22:52:53.59605223+03:00"

pkg/action/testdata/output/transitive-dependencies.txt

@@ -0,0 +1,4 @@
+NAME     	VERSION	REPOSITORY                                       	STATUS    
+wordpress	5.0.2  	https://kubernetes-charts.storage.googleapis.com 	ok        
+mariadb  	5.2.5  	https://kubernetes-charts.storage.googleapis.com/	transitive
+