feat(cli): validate name length on template create (#3823)

* feat(cli): add template create validation test

This adds a test to validate that `template create` prints an error
message if called with a template name exceeding the 32-char limit.

* fixup

* fixup test

* feat(cli): add name validation to templatecreate

This adds a validation step to ensure the template name is less than 32
characters.

* fixup!: use utf8.RuneCountInString

* fixup!: remove pty from test

cli/templatecreate.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/briandowns/spinner"
 	"github.com/spf13/cobra"
@@ -49,6 +50,10 @@ func templateCreate() *cobra.Command {
 				templateName = args[0]
 			}
 
+			if utf8.RuneCountInString(templateName) > 31 {
+				return xerrors.Errorf("Template name must be less than 32 characters")
+			}
+
 			_, err = client.TemplateByName(cmd.Context(), organization.ID, templateName)
 			if err == nil {
 				return xerrors.Errorf("A template already exists named %q!", templateName)

cli/templatecreate_test.go

@@ -241,6 +241,21 @@ func TestTemplateCreate(t *testing.T) {
 		err = create()
 		require.NoError(t, err, "Template must be recreated without error")
 	})
+
+	t.Run("WithParameterExceedingCharLimit", func(t *testing.T) {
+		t.Parallel()
+		client := coderdtest.New(t, &coderdtest.Options{IncludeProvisionerD: true})
+		coderdtest.CreateFirstUser(t, client)
+		cmd, root := clitest.New(t, "templates", "create", "1234567890123456789012345678901234567891", "--test.provisioner", string(database.ProvisionerTypeEcho))
+		clitest.SetupConfig(t, client, root)
+
+		execDone := make(chan error)
+		go func() {
+			execDone <- cmd.Execute()
+		}()
+
+		require.EqualError(t, <-execDone, "Template name must be less than 32 characters")
+	})
 }
 
 func createTestParseResponse() []*proto.Parse_Response {