Add ability to upload local binary

main.go

@@ -41,6 +41,7 @@ type rootCmd struct {
 	noReuseConnection bool
 	bindAddr          string
 	sshFlags          string
+	uploadCodeServer  string
 }
 
 func (c *rootCmd) Spec() cli.CommandSpec {
@@ -58,6 +59,7 @@ func (c *rootCmd) RegisterFlags(fl *pflag.FlagSet) {
 	fl.BoolVar(&c.noReuseConnection, "no-reuse-connection", false, "do not reuse SSH connection via control socket")
 	fl.StringVar(&c.bindAddr, "bind", "", "local bind address for SSH tunnel, in [HOST][:PORT] syntax (default: 127.0.0.1)")
 	fl.StringVar(&c.sshFlags, "ssh-flags", "", "custom SSH flags")
+	fl.StringVar(&c.uploadCodeServer, "upload-code-server", "", "custom code-server binary to upload to the remote host")
 }
 
 func (c *rootCmd) Run(fl *pflag.FlagSet) {
@@ -79,11 +81,12 @@ func (c *rootCmd) Run(fl *pflag.FlagSet) {
 	}
 
 	err := sshCode(host, dir, options{
-		skipSync:        c.skipSync,
-		sshFlags:        c.sshFlags,
-		bindAddr:        c.bindAddr,
-		syncBack:        c.syncBack,
-		reuseConnection: !c.noReuseConnection,
+		skipSync:         c.skipSync,
+		sshFlags:         c.sshFlags,
+		bindAddr:         c.bindAddr,
+		syncBack:         c.syncBack,
+		reuseConnection:  !c.noReuseConnection,
+		uploadCodeServer: c.uploadCodeServer,
 	})
 
 	if err != nil {

sshcode.go

@@ -29,13 +29,14 @@ const (
 )
 
 type options struct {
-	skipSync        bool
-	syncBack        bool
-	noOpen          bool
-	reuseConnection bool
-	bindAddr        string
-	remotePort      string
-	sshFlags        string
+	skipSync         bool
+	syncBack         bool
+	noOpen           bool
+	reuseConnection  bool
+	bindAddr         string
+	remotePort       string
+	sshFlags         string
+	uploadCodeServer string
 }
 
 func sshCode(host, dir string, o options) error {
@@ -76,23 +77,49 @@ func sshCode(host, dir string, o options) error {
 		}
 	}
 
-	flog.Info("ensuring code-server is updated...")
-	dlScript := downloadScript(codeServerPath)
+	// Upload local code-server or download code-server from CI server.
+	if o.uploadCodeServer != "" {
+		flog.Info("uploading local code-server binary...")
+		err = copyCodeServerBinary(o.sshFlags, host, o.uploadCodeServer, codeServerPath)
+		if err != nil {
+			return xerrors.Errorf("failed to upload local code-server binary to remote server: %w", err)
+		}
 
-	// Downloads the latest code-server and allows it to be executed.
-	sshCmdStr := fmt.Sprintf("ssh %v %v '/usr/bin/env bash -l'", o.sshFlags, host)
+		sshCmdStr :=
+			fmt.Sprintf("ssh %v %v 'chmod +x %v'",
+				o.sshFlags, host, codeServerPath,
+			)
 
-	sshCmd := exec.Command("sh", "-l", "-c", sshCmdStr)
-	sshCmd.Stdout = os.Stdout
-	sshCmd.Stderr = os.Stderr
-	sshCmd.Stdin = strings.NewReader(dlScript)
-	err = sshCmd.Run()
-	if err != nil {
-		return xerrors.Errorf("failed to update code-server: \n---ssh cmd---\n%s\n---download script---\n%s: %w",
-			sshCmdStr,
-			dlScript,
-			err,
-		)
+		sshCmd := exec.Command("sh", "-l", "-c", sshCmdStr)
+		sshCmd.Stdout = os.Stdout
+		sshCmd.Stderr = os.Stderr
+		err = sshCmd.Run()
+		if err != nil {
+			return xerrors.Errorf("failed to make code-server binary executable:\n---ssh cmd---\n%s: %w",
+				sshCmdStr,
+				err,
+			)
+		}
+	} else {
+		flog.Info("ensuring code-server is updated...")
+		dlScript := downloadScript(codeServerPath)
+
+		// Downloads the latest code-server and allows it to be executed.
+		sshCmdStr := fmt.Sprintf("ssh %v %v '/usr/bin/env bash -l'", o.sshFlags, host)
+
+		sshCmd := exec.Command("sh", "-l", "-c", sshCmdStr)
+		sshCmd.Stdout = os.Stdout
+		sshCmd.Stderr = os.Stderr
+		sshCmd.Stdin = strings.NewReader(dlScript)
+		err = sshCmd.Run()
+		if err != nil {
+			return xerrors.Errorf("failed to update code-server:\n---ssh cmd---\n%s"+
+				"\n---download script---\n%s: %w",
+				sshCmdStr,
+				dlScript,
+				err,
+			)
+		}
 	}
 
 	if !o.skipSync {
@@ -117,13 +144,13 @@ func sshCode(host, dir string, o options) error {
 
 	flog.Info("Tunneling remote port %v to %v", o.remotePort, o.bindAddr)
 
-	sshCmdStr =
+	sshCmdStr :=
 		fmt.Sprintf("ssh -tt -q -L %v:localhost:%v %v %v 'cd %v; %v --host 127.0.0.1 --allow-http --no-auth --port=%v'",
 			o.bindAddr, o.remotePort, o.sshFlags, host, dir, codeServerPath, o.remotePort,
 		)
 
 	// Starts code-server and forwards the remote port.
-	sshCmd = exec.Command("sh", "-l", "-c", sshCmdStr)
+	sshCmd := exec.Command("sh", "-l", "-c", sshCmdStr)
 	sshCmd.Stdin = os.Stdin
 	sshCmd.Stdout = os.Stdout
 	sshCmd.Stderr = os.Stderr
@@ -399,6 +426,20 @@ func checkSSHMaster(sshMasterCmd *exec.Cmd, sshFlags string, host string) error
 	return xerrors.Errorf("max number of tries exceeded: %d", maxTries)
 }
 
+// copyCodeServerBinary copies a code-server binary from local to remote.
+func copyCodeServerBinary(sshFlags string, host string, localPath string, remotePath string) error {
+	if err := validateIsFile(localPath); err != nil {
+		return err
+	}
+
+	var (
+		src  = localPath
+		dest = host + ":" + remotePath
+	)
+
+	return rsync(src, dest, sshFlags)
+}
+
 func syncUserSettings(sshFlags string, host string, back bool) error {
 	localConfDir, err := configDir()
 	if err != nil {
@@ -517,6 +558,18 @@ func ensureDir(path string) error {
 	return nil
 }
 
+// validateIsFile tries to stat the specified path and ensure it's a file.
+func validateIsFile(path string) error {
+	info, err := os.Stat(path)
+	if err != nil {
+		return err
+	}
+	if info.IsDir() {
+		return xerrors.New("path is a directory")
+	}
+	return nil
+}
+
 // parseHost parses the host argument. If 'gcp:' is prefixed to the
 // host then a lookup is done using gcloud to determine the external IP and any
 // additional SSH arguments that should be used for ssh commands. Otherwise, host