Feat: support helm flag --enable-dns (#830)

* Support helm flag --enable-dns

Signed-off-by: vincent_stchu <24803055+vincentstchu@users.noreply.github.com>

pkg/state/state.go

@@ -157,6 +157,8 @@ type HelmSpec struct {
 	KubeContext string   `yaml:"kubeContext,omitempty"`
 	Args        []string `yaml:"args,omitempty"`
 	Verify      bool     `yaml:"verify"`
+	// EnableDNS, when set to true, enable DNS lookups when rendering templates
+	EnableDNS bool `yaml:"enableDNS"`
 	// Devel, when set to true, use development versions, too. Equivalent to version '>0.0.0-0'
 	Devel bool `yaml:"devel"`
 	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
@@ -233,6 +235,8 @@ type ReleaseSpec struct {
 	// Verify enables signature verification on fetched chart.
 	// Beware some (or many?) chart repositories and charts don't seem to support it.
 	Verify *bool `yaml:"verify,omitempty"`
+	// EnableDNS, when set to true, enable DNS lookups when rendering templates
+	EnableDNS *bool `yaml:"enableDNS,omitempty"`
 	// Devel, when set to true, use development versions, too. Equivalent to version '>0.0.0-0'
 	Devel *bool `yaml:"devel,omitempty"`
 	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
@@ -2477,6 +2481,10 @@ func (st *HelmState) flagsForUpgrade(helm helmexec.Interface, release *ReleaseSp
 		flags = append(flags, "--verify")
 	}
 
+	if release.EnableDNS != nil && *release.EnableDNS || release.EnableDNS == nil && st.HelmDefaults.EnableDNS {
+		flags = append(flags, "--enable-dns")
+	}
+
 	if release.Wait != nil && *release.Wait || release.Wait == nil && st.HelmDefaults.Wait {
 		flags = append(flags, "--wait")
 	}

pkg/state/state_test.go

@@ -235,6 +235,41 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 				"--namespace", "test-namespace",
 			},
 		},
+		{
+			name: "enable-dns",
+			defaults: HelmSpec{
+				EnableDNS: false,
+			},
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				EnableDNS: &enable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--enable-dns",
+				"--namespace", "test-namespace",
+			},
+		},
+		{
+			name: "enable-dns-from-default",
+			defaults: HelmSpec{
+				EnableDNS: true,
+			},
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				EnableDNS: &disable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--namespace", "test-namespace",
+			},
+		},
 		{
 			name: "force",
 			defaults: HelmSpec{

pkg/state/temp_test.go

@@ -38,39 +38,39 @@ func TestGenerateID(t *testing.T) {
 	run(testcase{
 		subject: "baseline",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
-		want:    "foo-values-77cb4d7f9b",
+		want:    "foo-values-76d4857b56",
 	})
 
 	run(testcase{
 		subject: "different bytes content",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
 		data:    []byte(`{"k":"v"}`),
-		want:    "foo-values-6f6bc74b55",
+		want:    "foo-values-55d59fb487",
 	})
 
 	run(testcase{
 		subject: "different map content",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
 		data:    map[string]interface{}{"k": "v"},
-		want:    "foo-values-57dfc6cb8f",
+		want:    "foo-values-7c8d99f9f7",
 	})
 
 	run(testcase{
 		subject: "different chart",
 		release: ReleaseSpec{Name: "foo", Chart: "stable/envoy"},
-		want:    "foo-values-74594bb67",
+		want:    "foo-values-7467f76549",
 	})
 
 	run(testcase{
 		subject: "different name",
 		release: ReleaseSpec{Name: "bar", Chart: "incubator/raw"},
-		want:    "bar-values-bdbb54d7",
+		want:    "bar-values-dbdf465b7",
 	})
 
 	run(testcase{
 		subject: "specific ns",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw", Namespace: "myns"},
-		want:    "myns-foo-values-677dcd477",
+		want:    "myns-foo-values-6d4874d757",
 	})
 
 	for id, n := range ids {