Add build command

which only builds the image but does not run it

cmd/build.go

@@ -0,0 +1,95 @@
+// Copyright (c) 2020 Gitpod GmbH. All rights reserved.
+// Licensed under the GNU Affero General Public License (AGPL).
+// See License-AGPL.txt in the project root for license information.
+
+package cmd
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/gitpod-io/gitpod/run-gp/pkg/console"
+	"github.com/gitpod-io/gitpod/run-gp/pkg/update"
+	"github.com/spf13/cobra"
+)
+
+// serveCmd represents the serve command
+var buildCmd = &cobra.Command{
+	Use:   "build <target-reference>",
+	Short: "Builds the workspace image",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		uiMode := console.UIModeAuto
+		if rootOpts.Verbose {
+			uiMode = console.UIModeDaemon
+		}
+		log, done, err := console.NewBubbleTeaUI(console.BubbleUIOpts{
+			UIMode:  uiMode,
+			Verbose: rootOpts.Verbose,
+		})
+		if err != nil {
+			return err
+		}
+		console.Init(log)
+
+		cfg, err := getGitpodYaml()
+		if err != nil {
+			return err
+		}
+		if cfg.WorkspaceLocation == "" {
+			cfg.WorkspaceLocation = cfg.CheckoutLocation
+		}
+
+		runtime, err := getRuntime(rootOpts.Workdir)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		shutdown := make(chan struct{})
+		go func() {
+			defer close(shutdown)
+
+			if rootOpts.cfg.AutoUpdate.Enabled {
+				ctx, cancel := context.WithTimeout(context.Background(), 30*time.Minute)
+				defer cancel()
+				didUpdate, err := update.Update(ctx, version, update.NewGitHubReleaseDiscovery(ctx), rootOpts.cfg.Filename)
+				if errors.Is(err, context.Canceled) {
+					return
+				} else if err != nil {
+					log.Warnf("failed to auto-update: %v", err)
+				} else if didUpdate {
+					log.Warnf("Updated to new version - update comes into effect with the next start of run-gp")
+				}
+			}
+
+			buildingPhase := log.StartPhase("[building]", "workspace image")
+			ref := args[0]
+			bldLog := log.Writer()
+			err = runtime.BuildImage(ctx, bldLog, ref, cfg)
+			if err != nil {
+				buildingPhase.Failure(err.Error())
+				return
+			}
+			bldLog.Discard()
+			buildingPhase.Success()
+		}()
+
+		select {
+		case <-done:
+			cancel()
+			<-shutdown
+		case <-shutdown:
+			log.Quit()
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(buildCmd)
+}