Terraform module version optional

pkg/app/piped/cloudprovider/terraform/module.go

@@ -22,7 +22,7 @@ type FileMapping struct {
 type ModuleMapping struct {
 	Name    string   `hcl:"name,label"`
 	Source  string   `hcl:"source"`
-	Version string   `hcl:"version"`
+	Version string   `hcl:"version,optional"`
 	Remain  hcl.Body `hcl:",remain"`
 }
 

pkg/app/piped/cloudprovider/terraform/module_test.go

@@ -34,6 +34,22 @@ func TestLoadTerraformFiles(t *testing.T) {
 			},
 			expectedErr: false,
 		},
+		{
+			name:      "single module with optional argument",
+			moduleDir: "./testdata/single_module_optional",
+			expected: []File{
+				{
+					Modules: []*Module{
+						{
+							Name:    "helloworld",
+							Source:  "helloworld",
+							Version: "",
+						},
+					},
+				},
+			},
+			expectedErr: false,
+		},
 		{
 			name:      "multi modules",
 			moduleDir: "./testdata/multi_modules",
@@ -120,6 +136,19 @@ func TestFindArticatVersions(t *testing.T) {
 			},
 			expectedErr: false,
 		},
+		{
+			name:      "single module with optional field",
+			moduleDir: "./testdata/single_module_optional",
+			expected: []*model.ArtifactVersion{
+				{
+					Kind:    model.ArtifactVersion_TERRAFORM_MODULE,
+					Name:    "helloworld",
+					Url:     "helloworld",
+					Version: "",
+				},
+			},
+			expectedErr: false,
+		},
 		{
 			name:      "multi modules",
 			moduleDir: "./testdata/multi_modules",

pkg/app/piped/cloudprovider/terraform/testdata/single_module_optional/helloworld/main.tf

@@ -0,0 +1,19 @@
+resource "docker_container" "helloworld" {
+  name = "gcr.io/pipecd/helloworld:${var.image_version}"
+  ports {
+    internal = 9376
+    external = "${var.external_port}"
+  }
+}
+
+variable "external_port" {
+    default = 80
+}
+
+variable "image_version" {
+  default = "latest"
+}
+
+output "container" {
+  value = docker_image.helloworld
+}

pkg/app/piped/cloudprovider/terraform/testdata/single_module_optional/main.tf

@@ -0,0 +1,8 @@
+provider "docker" {
+}
+
+module "helloworld" {
+  source = "helloworld"
+  image_version = "v1.0.0"
+  external_port = 8080
+}