fix(provisioner/terraform/tfparse): allow empty values in coder_workspace_tag defaults (#16303)

* chore(docs): update docs re workspace tag default values
* chore(coderdenttest): use random name instead of t.Name() in newExternalProvisionerDaemon
* fix(provisioner/terraform/tfparse): allow empty values in coder_workspace_tag defaults

coderd/templateversions_test.go

@@ -429,9 +429,8 @@ func TestPostTemplateVersionsByOrganization(t *testing.T) {
 							}
 						}`,
 				},
-				reqTags: map[string]string{"a": "b"},
-				// wantTags: map[string]string{"owner": "", "scope": "organization", "a": "b"},
-				expectError: `provisioner tag "a" evaluated to an empty value`,
+				reqTags:  map[string]string{"a": "b"},
+				wantTags: map[string]string{"owner": "", "scope": "organization", "a": "b"},
 			},
 			{
 				name: "main.tf with disallowed workspace tag value",
@@ -568,6 +567,42 @@ func TestPostTemplateVersionsByOrganization(t *testing.T) {
 				},
 				wantTags: map[string]string{"owner": "", "scope": "organization"},
 			},
+			{
+				name: "main.tf with tags from parameter with default value from variable no default",
+				files: map[string]string{
+					`main.tf`: `
+						variable "provisioner" {
+						  type        = string
+						}
+						variable "default_provisioner" {
+						  type        = string
+						  default     = "" # intentionally blank, set on template creation
+						}
+						data "coder_parameter" "provisioner" {
+						  name         = "provisioner"
+						  mutable      = false
+						  default      = var.default_provisioner
+						  dynamic "option" {
+							for_each = toset(split(",", var.provisioner))
+							content {
+							  name  = option.value
+							  value = option.value
+							}
+						  }
+						}
+						data "coder_workspace_tags" "tags" {
+						  tags = {
+							"provisioner" : data.coder_parameter.provisioner.value
+						  }
+						}`,
+				},
+				reqTags: map[string]string{
+					"provisioner": "alpha",
+				},
+				wantTags: map[string]string{
+					"provisioner": "alpha", "owner": "", "scope": "organization",
+				},
+			},
 		} {
 			tt := tt
 			t.Run(tt.name, func(t *testing.T) {

docs/admin/templates/extending-templates/workspace-tags.md

@@ -62,11 +62,6 @@ variables and parameters. This is illustrated in the table below:
 
 ## Constraints
 
-### Default Values
-
-All template variables and `coder_parameter` data sources **must** provide a
-default value. Failure to do so will result in an error.
-
 ### Tagged provisioners
 
 It is possible to choose tag combinations that no provisioner can handle. This
@@ -127,6 +122,6 @@ variables, and references to other resources.
 
 #### Not supported
 
-- Function calls: `try(var.foo, "default")`
+- Function calls that reference files on disk: `abspath`, `file*`, `pathexpand`
 - Resources: `compute_instance.dev.name`
 - Data sources other than `coder_parameter`: `data.local_file.hostname.content`

enterprise/coderd/coderdenttest/coderdenttest.go

@@ -389,7 +389,7 @@ func newExternalProvisionerDaemon(t testing.TB, client *codersdk.Client, org uui
 	daemon := provisionerd.New(func(ctx context.Context) (provisionerdproto.DRPCProvisionerDaemonClient, error) {
 		return client.ServeProvisionerDaemon(ctx, codersdk.ServeProvisionerDaemonRequest{
 			ID:           uuid.New(),
-			Name:         t.Name(),
+			Name:         testutil.GetRandomName(t),
 			Organization: org,
 			Provisioners: []codersdk.ProvisionerType{provisionerType},
 			Tags:         tags,

enterprise/coderd/provisionerdaemons_test.go

@@ -285,7 +285,7 @@ func TestProvisionerDaemonServe(t *testing.T) {
 			daemons, err := client.ProvisionerDaemons(context.Background())
 			assert.NoError(t, err, "failed to get provisioner daemons")
 			return len(daemons) > 0 &&
-				assert.Equal(t, t.Name(), daemons[0].Name) &&
+				assert.NotEmpty(t, daemons[0].Name) &&
 				assert.Equal(t, provisionersdk.ScopeUser, daemons[0].Tags[provisionersdk.TagScope]) &&
 				assert.Equal(t, user.UserID.String(), daemons[0].Tags[provisionersdk.TagOwner])
 		}, testutil.WaitShort, testutil.IntervalMedium)

enterprise/coderd/workspaces_test.go

@@ -1488,8 +1488,11 @@ func TestWorkspaceTagsTerraform(t *testing.T) {
 		createTemplateVersionRequestTags map[string]string
 		// the coder_workspace_tags bit of main.tf.
 		// you can add more stuff here if you need
-		tfWorkspaceTags     string
-		skipCreateWorkspace bool
+		tfWorkspaceTags                  string
+		templateImportUserVariableValues []codersdk.VariableValue
+		// if we need to set parameters on workspace build
+		workspaceBuildParameters []codersdk.WorkspaceBuildParameter
+		skipCreateWorkspace      bool
 	}{
 		{
 			name:            "no tags",
@@ -1589,6 +1592,38 @@ func TestWorkspaceTagsTerraform(t *testing.T) {
 			// matching tag foo=bar.
 			skipCreateWorkspace: true,
 		},
+		{
+			name:                             "overrides with dynamic option from var",
+			provisionerTags:                  map[string]string{"foo": "bar"},
+			createTemplateVersionRequestTags: map[string]string{"foo": "bar"},
+			templateImportUserVariableValues: []codersdk.VariableValue{{Name: "default_foo", Value: "baz"}, {Name: "foo", Value: "bar,baz"}},
+			workspaceBuildParameters:         []codersdk.WorkspaceBuildParameter{{Name: "foo", Value: "bar"}},
+			tfWorkspaceTags: `
+				variable "default_foo" {
+					type = string
+				}
+				variable "foo" {
+					type = string
+				}
+				data "coder_parameter" "foo" {
+					name = "foo"
+					type = "string"
+					default = var.default_foo
+					mutable = false
+					dynamic "option" {
+						for_each = toset(split(",", var.foo))
+						content {
+							name  = option.value
+							value = option.value
+						}
+					}
+				}
+				data "coder_workspace_tags" "tags" {
+					tags = {
+						"foo" = data.coder_parameter.foo.value
+					}
+				}`,
+		},
 	} {
 		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
@@ -1617,11 +1652,12 @@ func TestWorkspaceTagsTerraform(t *testing.T) {
 			fi, err := templateAdmin.Upload(ctx, "application/x-tar", bytes.NewReader(tarBytes))
 			require.NoError(t, err, "failed to upload file")
 			tv, err := templateAdmin.CreateTemplateVersion(ctx, owner.OrganizationID, codersdk.CreateTemplateVersionRequest{
-				Name:            testutil.GetRandomName(t),
-				FileID:          fi.ID,
-				StorageMethod:   codersdk.ProvisionerStorageMethodFile,
-				Provisioner:     codersdk.ProvisionerTypeTerraform,
-				ProvisionerTags: tc.createTemplateVersionRequestTags,
+				Name:               testutil.GetRandomName(t),
+				FileID:             fi.ID,
+				StorageMethod:      codersdk.ProvisionerStorageMethodFile,
+				Provisioner:        codersdk.ProvisionerTypeTerraform,
+				ProvisionerTags:    tc.createTemplateVersionRequestTags,
+				UserVariableValues: tc.templateImportUserVariableValues,
 			})
 			require.NoError(t, err, "failed to create template version")
 			coderdtest.AwaitTemplateVersionJobCompleted(t, templateAdmin, tv.ID)
@@ -1630,8 +1666,9 @@ func TestWorkspaceTagsTerraform(t *testing.T) {
 			if !tc.skipCreateWorkspace {
 				// Creating a workspace as a non-privileged user must succeed
 				ws, err := member.CreateUserWorkspace(ctx, memberUser.Username, codersdk.CreateWorkspaceRequest{
-					TemplateID: tpl.ID,
-					Name:       coderdtest.RandomUsername(t),
+					TemplateID:          tpl.ID,
+					Name:                coderdtest.RandomUsername(t),
+					RichParameterValues: tc.workspaceBuildParameters,
 				})
 				require.NoError(t, err, "failed to create workspace")
 				coderdtest.AwaitWorkspaceBuildJobCompleted(t, member, ws.LatestBuild.ID)

examples/workspace-tags/README.md

@@ -7,7 +7,7 @@ icon: /icon/docker.png
 
 ## Overview
 
-This Coder template presents use of [Workspace Tags](https://coder.com/docs/templates/workspace-tags) [Coder Parameters](https://coder.com/docs/templates/parameters).
+This Coder template presents use of [Workspace Tags](https://coder.com/docs/admin/templates/extending-templates/workspace-tags) and [Coder Parameters](https://coder.com/docs/templates/parameters).
 
 ## Use case
 
@@ -18,10 +18,8 @@ By using `coder_workspace_tags` and `coder_parameter`s, template administrators
 ## Notes
 
 - You will need to have an [external provisioner](https://coder.com/docs/admin/provisioners#external-provisioners) with the correct tagset running in order to import this template.
-- When specifying values for the `coder_workspace_tags` data source, you are restricted to using a subset of Terraform's capabilities.
-- You must specify default values for all data sources and variables referenced by the `coder_workspace_tags` data source.
+- When specifying values for the `coder_workspace_tags` data source, you are restricted to using a subset of Terraform's capabilities. See [here](https://coder.com/docs/admin/templates/extending-templates/workspace-tags) for more details.
 
-See [Workspace Tags](https://coder.com/docs/templates/workspace-tags) for more information.
 
 ## Development
 

provisioner/terraform/tfparse/tfparse.go

@@ -239,13 +239,6 @@ func (p *Parser) WorkspaceTagDefaults(ctx context.Context) (map[string]string, e
 		return nil, xerrors.Errorf("eval provisioner tags: %w", err)
 	}
 
-	// Ensure that none of the tag values are empty after evaluation.
-	for k, v := range evalTags {
-		if len(strings.TrimSpace(v)) > 0 {
-			continue
-		}
-		return nil, xerrors.Errorf("provisioner tag %q evaluated to an empty value, please set a default value", k)
-	}
 	return evalTags, nil
 }
 

provisioner/terraform/tfparse/tfparse_test.go

@@ -268,7 +268,7 @@ func Test_WorkspaceTagDefaultsFromFile(t *testing.T) {
 						}
 					}`,
 			},
-			expectError: `provisioner tag "az" evaluated to an empty value, please set a default value`,
+			expectTags: map[string]string{"cluster": "developers", "az": "", "platform": "kubernetes", "region": "us"},
 		},
 		{
 			name: "main.tf with missing parameter default value outside workspace tags",