feat: add coder_devcontainer resource (#368)

* feat: add `coder_devcontainer` resource

This change will allow autostarting Dev Containers.

This is implemented as a resource instead of a `schema.TypeSet` on the
agent resource to allow definition via Coder modules.

Updates coder/coder#16423

Author: mafredri

docs/resources/devcontainer.md

@@ -0,0 +1,29 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "coder_devcontainer Resource - terraform-provider-coder"
+subcategory: ""
+description: |-
+  Define a Dev Container the agent should know of and attempt to autostart (minimum Coder version: v2.21).
+---
+
+# coder_devcontainer (Resource)
+
+Define a Dev Container the agent should know of and attempt to autostart (minimum Coder version: v2.21).
+
+
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `agent_id` (String) The `id` property of a `coder_agent` resource to associate with.
+- `workspace_folder` (String) The workspace folder to for the Dev Container.
+
+### Optional
+
+- `config_path` (String) The path to the Dev Container configuration file (devcontainer.json).
+
+### Read-Only
+
+- `id` (String) The ID of this resource.

provider/devcontainer.go

@@ -0,0 +1,46 @@
+package provider
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/validation"
+)
+
+func devcontainerResource() *schema.Resource {
+	return &schema.Resource{
+		SchemaVersion: 1,
+
+		Description: "Define a Dev Container the agent should know of and attempt to autostart (minimum Coder version: v2.21).",
+		CreateContext: func(_ context.Context, rd *schema.ResourceData, _ interface{}) diag.Diagnostics {
+			rd.SetId(uuid.NewString())
+
+			return nil
+		},
+		ReadContext:   schema.NoopContext,
+		DeleteContext: schema.NoopContext,
+		Schema: map[string]*schema.Schema{
+			"agent_id": {
+				Type:        schema.TypeString,
+				Description: "The `id` property of a `coder_agent` resource to associate with.",
+				ForceNew:    true,
+				Required:    true,
+			},
+			"workspace_folder": {
+				Type:         schema.TypeString,
+				Description:  "The workspace folder to for the Dev Container.",
+				ForceNew:     true,
+				Required:     true,
+				ValidateFunc: validation.StringIsNotEmpty,
+			},
+			"config_path": {
+				Type:        schema.TypeString,
+				Description: "The path to the Dev Container configuration file (devcontainer.json).",
+				ForceNew:    true,
+				Optional:    true,
+			},
+		},
+	}
+}

provider/devcontainer_test.go

@@ -0,0 +1,98 @@
+package provider_test
+
+import (
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
+)
+
+func TestDevcontainer(t *testing.T) {
+	t.Parallel()
+
+	resource.Test(t, resource.TestCase{
+		ProviderFactories: coderFactory(),
+		IsUnitTest:        true,
+		Steps: []resource.TestStep{{
+			Config: `
+			provider "coder" {
+			}
+			resource "coder_devcontainer" "example" {
+				agent_id = "king"
+				workspace_folder = "/workspace"
+				config_path = "/workspace/devcontainer.json"
+			}
+			`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				script := state.Modules[0].Resources["coder_devcontainer.example"]
+				require.NotNil(t, script)
+				t.Logf("script attributes: %#v", script.Primary.Attributes)
+				for key, expected := range map[string]string{
+					"agent_id":         "king",
+					"workspace_folder": "/workspace",
+					"config_path":      "/workspace/devcontainer.json",
+				} {
+					require.Equal(t, expected, script.Primary.Attributes[key])
+				}
+				return nil
+			},
+		}},
+	})
+}
+
+func TestDevcontainerNoConfigPath(t *testing.T) {
+	t.Parallel()
+
+	resource.Test(t, resource.TestCase{
+		ProviderFactories: coderFactory(),
+		IsUnitTest:        true,
+		Steps: []resource.TestStep{{
+			Config: `
+			provider "coder" {
+			}
+			resource "coder_devcontainer" "example" {
+				agent_id = "king"
+				workspace_folder = "/workspace"
+			}
+			`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				script := state.Modules[0].Resources["coder_devcontainer.example"]
+				require.NotNil(t, script)
+				t.Logf("script attributes: %#v", script.Primary.Attributes)
+				for key, expected := range map[string]string{
+					"agent_id":         "king",
+					"workspace_folder": "/workspace",
+				} {
+					require.Equal(t, expected, script.Primary.Attributes[key])
+				}
+				return nil
+			},
+		}},
+	})
+}
+
+func TestDevcontainerNoWorkspaceFolder(t *testing.T) {
+	t.Parallel()
+
+	resource.Test(t, resource.TestCase{
+		ProviderFactories: coderFactory(),
+		IsUnitTest:        true,
+		Steps: []resource.TestStep{{
+			Config: `
+			provider "coder" {
+			}
+			resource "coder_devcontainer" "example" {
+				agent_id = ""
+			}
+			`,
+			ExpectError: regexp.MustCompile(`The argument "workspace_folder" is required, but no definition was found.`),
+		}},
+	})
+}

provider/provider.go

@@ -76,6 +76,7 @@ func New() *schema.Provider {
 			"coder_metadata":       metadataResource(),
 			"coder_script":         scriptResource(),
 			"coder_env":            envResource(),
+			"coder_devcontainer":   devcontainerResource(),
 		},
 	}
 }