coder · sreya · Jun 15, 2022 · Jun 14, 2022 · Jun 14, 2022 · Jun 15, 2022
diff --git a/cli/templatepull.go b/cli/templatepull.go
@@ -0,0 +1,123 @@
+package cli
+
+import (
+	"fmt"
+	"io/fs"
+	"os"
+	"sort"
+
+	"github.com/spf13/cobra"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/cli/cliui"
+	"github.com/coder/coder/codersdk"
+)
+
+func templatePull() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "pull <name> [destination]",
+		Short: "Download the latest version of a template to a path.",
+		Args:  cobra.MaximumNArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var (
+				ctx          = cmd.Context()
+				templateName = args[0]
+				dest         string
+			)
+
+			if len(args) > 1 {
+				dest = args[1]
+			}
+
+			client, err := createClient(cmd)
+			if err != nil {
+				return xerrors.Errorf("create client: %w", err)
+			}
+
+			// TODO(JonA): Do we need to add a flag for organization?
+			organization, err := currentOrganization(cmd, client)
+			if err != nil {
+				return xerrors.Errorf("current organization: %w", err)
+			}
+
+			template, err := client.TemplateByName(ctx, organization.ID, templateName)
+			if err != nil {
+				return xerrors.Errorf("template by name: %w", err)
+			}
+
+			// Pull the versions for the template. We'll find the latest
+			// one and download the source.
+			versions, err := client.TemplateVersionsByTemplate(ctx, codersdk.TemplateVersionsByTemplateRequest{
+				TemplateID: template.ID,
+			})
+			if err != nil {
+				return xerrors.Errorf("template versions by template: %w", err)
+			}
+
+			if len(versions) == 0 {
+				return xerrors.Errorf("no template versions for template %q", templateName)
+			}
+
+			// Sort the slice from newest to oldest template.
+			sort.SliceStable(versions, func(i, j int) bool {
+				return versions[i].CreatedAt.After(versions[j].CreatedAt)
+			})
+
+			latest := versions[0]
+
+			// Download the tar archive.
+			raw, ctype, err := client.Download(ctx, latest.Job.StorageSource)
+			if err != nil {
+				return xerrors.Errorf("download template: %w", err)
+			}
+
+			if ctype != codersdk.ContentTypeTar {
+				return xerrors.Errorf("unexpected Content-Type %q, expecting %q", ctype, codersdk.ContentTypeTar)
+			}
+
+			// If the destination is empty then we write to stdout
+			// and bail early.
+			if dest == "" {
+				_, err = cmd.OutOrStdout().Write(raw)
+				if err != nil {
+					return xerrors.Errorf("write stdout: %w", err)
+				}
+				return nil
+			}
+
+			// Stat the destination to ensure nothing exists already.
+			fi, err := os.Stat(dest)
+			if err != nil && !xerrors.Is(err, fs.ErrNotExist) {
+				return xerrors.Errorf("stat destination: %w", err)
+			}
+
+			if fi != nil && fi.IsDir() {
+				// If the destination is a directory we just bail.
+				return xerrors.Errorf("%q already exists.", dest)
+			}
+
+			// If a file exists at the destination prompt the user
+			// to ensure we don't overwrite something valuable.
+			if fi != nil {
+				_, err = cliui.Prompt(cmd, cliui.PromptOptions{
+					Text:      fmt.Sprintf("%q already exists, do you want to overwrite it?", dest),
+					IsConfirm: true,
+				})
+				if err != nil {
+					return xerrors.Errorf("parse prompt: %w", err)
+				}
+			}
+
+			err = os.WriteFile(dest, raw, 0600)
+			if err != nil {
+				return xerrors.Errorf("write to path: %w", err)
+			}
+
+			return nil
+		},
+	}
+
+	cliui.AllowSkipPrompt(cmd)
+
+	return cmd
+}
diff --git a/cli/templatepull_test.go b/cli/templatepull_test.go
@@ -0,0 +1,143 @@
+package cli_test
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/cli/clitest"
+	"github.com/coder/coder/coderd/coderdtest"
+	"github.com/coder/coder/provisioner/echo"
+	"github.com/coder/coder/provisionersdk/proto"
+	"github.com/coder/coder/pty/ptytest"
+)
+
+func TestTemplatePull(t *testing.T) {
+	t.Parallel()
+
+	// Stdout tests that 'templates pull' pulls down the latest template
+	// and writes it to stdout.
+	t.Run("Stdout", func(t *testing.T) {
+		t.Parallel()
+
+		client := coderdtest.New(t, &coderdtest.Options{IncludeProvisionerD: true})
+		user := coderdtest.CreateFirstUser(t, client)
+
+		// Create an initial template bundle.
+		source1 := genTemplateVersionSource()
+		// Create an updated template bundle. This will be used to ensure
+		// that templates are correctly returned in order from latest to oldest.
+		source2 := genTemplateVersionSource()
+
+		expected, err := echo.Tar(source2)
+		require.NoError(t, err)
+
+		version1 := coderdtest.CreateTemplateVersion(t, client, user.OrganizationID, source1)
+		_ = coderdtest.AwaitTemplateVersionJob(t, client, version1.ID)
+
+		template := coderdtest.CreateTemplate(t, client, user.OrganizationID, version1.ID)
+
+		// Update the template version so that we can assert that templates
+		// are being sorted correctly.
+		_ = coderdtest.UpdateTemplateVersion(t, client, user.OrganizationID, source2, template.ID)
+
+		cmd, root := clitest.New(t, "templates", "pull", template.Name)
+		clitest.SetupConfig(t, client, root)
+
+		var buf bytes.Buffer
+		cmd.SetOut(&buf)
+
+		err = cmd.Execute()
+		require.NoError(t, err)
+
+		require.True(t, bytes.Equal(expected, buf.Bytes()), "tar files differ")
+	})
+
+	// ToFile tests that 'templates pull' pulls down the latest template
+	// and writes it to the correct directory.
+	t.Run("ToFile", func(t *testing.T) {
+		t.Parallel()
+
+		client := coderdtest.New(t, &coderdtest.Options{IncludeProvisionerD: true})
+		user := coderdtest.CreateFirstUser(t, client)
+
+		// Create an initial template bundle.
+		source1 := genTemplateVersionSource()
+		// Create an updated template bundle. This will be used to ensure
+		// that templates are correctly returned in order from latest to oldest.
+		source2 := genTemplateVersionSource()
+
+		expected, err := echo.Tar(source2)
+		require.NoError(t, err)
+
+		version1 := coderdtest.CreateTemplateVersion(t, client, user.OrganizationID, source1)
+		_ = coderdtest.AwaitTemplateVersionJob(t, client, version1.ID)
+
+		template := coderdtest.CreateTemplate(t, client, user.OrganizationID, version1.ID)
+
+		// Update the template version so that we can assert that templates
+		// are being sorted correctly.
+		_ = coderdtest.UpdateTemplateVersion(t, client, user.OrganizationID, source2, template.ID)
+
+		dir := t.TempDir()
+
+		dest := filepath.Join(dir, "actual.tar")
+
+		// Create the file so that we can test that the command
+		// warns the user before overwriting a preexisting file.
+		fi, err := os.OpenFile(dest, os.O_CREATE|os.O_RDONLY, 0600)
+		require.NoError(t, err)
+		_ = fi.Close()
+
+		cmd, root := clitest.New(t, "templates", "pull", template.Name, dest)
+		clitest.SetupConfig(t, client, root)
+
+		pty := ptytest.New(t)
+		cmd.SetIn(pty.Input())
+		cmd.SetOut(pty.Output())
+
+		errChan := make(chan error)
+		go func() {
+			defer close(errChan)
+			errChan <- cmd.Execute()
+		}()
+
+		// We expect to be prompted that a file already exists.
+		pty.ExpectMatch("already exists")
+		pty.WriteLine("yes")
+
+		require.NoError(t, <-errChan)
+
+		actual, err := os.ReadFile(dest)
+		require.NoError(t, err)
+
+		require.True(t, bytes.Equal(actual, expected), "tar files differ")
+	})
+}
+
+// genTemplateVersionSource returns a unique bundle that can be used to create
+// a template version source.
+func genTemplateVersionSource() *echo.Responses {
+	return &echo.Responses{
+		Parse: []*proto.Parse_Response{
+			{
+				Type: &proto.Parse_Response_Log{
+					Log: &proto.Log{
+						Output: uuid.NewString(),
+					},
+				},
+			},
+
+			{
+				Type: &proto.Parse_Response_Complete{
+					Complete: &proto.Parse_Complete{},
+				},
+			},
+		},
+		Provision: echo.ProvisionComplete,
+	}
+}
diff --git a/cli/templates.go b/cli/templates.go
@@ -33,6 +33,7 @@ func templates() *cobra.Command {
 		templateUpdate(),
 		templateVersions(),
 		templateDelete(),
+		templatePull(),
 	)
 
 	return cmd

diff --git a/coderd/provisionerjobs.go b/coderd/provisionerjobs.go
@@ -287,9 +287,10 @@ func convertProvisionerJobLog(provisionerJobLog database.ProvisionerJobLog) code
 
 func convertProvisionerJob(provisionerJob database.ProvisionerJob) codersdk.ProvisionerJob {
 	job := codersdk.ProvisionerJob{
-		ID:        provisionerJob.ID,
-		CreatedAt: provisionerJob.CreatedAt,
-		Error:     provisionerJob.Error.String,
+		ID:            provisionerJob.ID,
+		CreatedAt:     provisionerJob.CreatedAt,
+		Error:         provisionerJob.Error.String,
+		StorageSource: provisionerJob.StorageSource,
 	}
 	// Applying values optional to the struct.
 	if provisionerJob.StartedAt.Valid {

diff --git a/codersdk/provisionerdaemons.go b/codersdk/provisionerdaemons.go
@@ -60,13 +60,14 @@ const (
 )
 
 type ProvisionerJob struct {
-	ID          uuid.UUID            `json:"id"`
-	CreatedAt   time.Time            `json:"created_at"`
-	StartedAt   *time.Time           `json:"started_at,omitempty"`
-	CompletedAt *time.Time           `json:"completed_at,omitempty"`
-	Error       string               `json:"error,omitempty"`
-	Status      ProvisionerJobStatus `json:"status"`
-	WorkerID    *uuid.UUID           `json:"worker_id,omitempty"`
+	ID            uuid.UUID            `json:"id"`
+	CreatedAt     time.Time            `json:"created_at"`
+	StartedAt     *time.Time           `json:"started_at,omitempty"`
+	CompletedAt   *time.Time           `json:"completed_at,omitempty"`
+	Error         string               `json:"error,omitempty"`
+	Status        ProvisionerJobStatus `json:"status"`
+	WorkerID      *uuid.UUID           `json:"worker_id,omitempty"`
+	StorageSource string               `json:"storage_source"`
 }
 
 type ProvisionerJobLog struct {

diff --git a/site/src/api/typesGenerated.ts b/site/src/api/typesGenerated.ts
@@ -211,9 +211,10 @@ export interface ProvisionerJob {
   readonly error?: string
   readonly status: ProvisionerJobStatus
   readonly worker_id?: string
+  readonly storage_source: string
 }
 
-// From codersdk/provisionerdaemons.go:72:6
+// From codersdk/provisionerdaemons.go:73:6
 export interface ProvisionerJobLog {
   readonly id: string
   readonly created_at: string

diff --git a/site/src/testHelpers/entities.ts b/site/src/testHelpers/entities.ts
@@ -69,7 +69,9 @@ export const MockProvisionerJob: TypesGen.ProvisionerJob = {
   created_at: "",
   id: "test-provisioner-job",
   status: "succeeded",
+  storage_source: "asdf",
 }
+
 export const MockFailedProvisionerJob: TypesGen.ProvisionerJob = {
   ...MockProvisionerJob,
   status: "failed",