feat: send or move files and folders to another machine or an SSH host from the move dialog, streamed as tar with progress, speed and cancel; same conflict rules as a local move

internal/agent/ssh.go

@@ -148,32 +148,22 @@ func (s *sshShell) Close() error {
 	return nil
 }
 
-// runSSH connects to the target and bridges its shell to the session.
-func (a *Agent) runSSH(parent context.Context, sid string, t proto.SSHTarget) {
-	status := func(st, note string) {
-		a.postOut(context.Background(), sid, proto.OutMessage{Status: st, Note: note})
-	}
-	fail := func(err error) {
-		log.Printf("ssh %s: %v", sid, err)
-		status(proto.SSHErr, err.Error())
-		a.postOut(context.Background(), sid, proto.OutMessage{Data: b64.EncodeToString([]byte("\x1b[31m" + err.Error() + "\x1b[0m\r\n"))})
-		a.postOut(context.Background(), sid, proto.OutMessage{Exit: true})
-	}
+// sshConnect connects and signs in to t, saying how it goes by status (the
+// SSHStatus steps). It returns the client and the host key's fingerprint.
+func (a *Agent) sshConnect(ctx context.Context, t proto.SSHTarget, status func(st, note string)) (*ssh.Client, string, error) {
 	if t.Port == 0 {
 		t.Port = 22
 	}
 	addr := net.JoinHostPort(t.Host, strconv.Itoa(t.Port))
 	auth, err := sshAuth(t)
 	if err != nil {
-		fail(err)
-		return
+		return nil, "", err
 	}
 	status(proto.SSHDial, "подключение к "+addr)
 	d := net.Dialer{Timeout: 15 * time.Second, KeepAlive: 30 * time.Second}
-	conn, err := d.DialContext(parent, "tcp", addr)
+	conn, err := d.DialContext(ctx, "tcp", addr)
 	if err != nil {
-		fail(fmt.Errorf("не подключиться к %s: %v", addr, err))
-		return
+		return nil, "", fmt.Errorf("не подключиться к %s: %v", addr, err)
 	}
 	status(proto.SSHAuth, "вход как "+t.User)
 	var fp string
@@ -190,11 +180,33 @@ func (a *Agent) runSSH(parent context.Context, sid string, t proto.SSHTarget) {
 		if strings.Contains(msg, "unable to authenticate") {
 			msg = "сервер не принял вход как " + t.User + " - проверьте пароль или ключ"
 		}
-		fail(errors.New(msg))
-		return
+		return nil, "", errors.New(msg)
 	}
 	_ = conn.SetDeadline(time.Time{})
-	client := ssh.NewClient(c, chans, reqs)
+	return ssh.NewClient(c, chans, reqs), fp, nil
+}
+
+// runSSH connects to the target and bridges its shell to the session.
+func (a *Agent) runSSH(parent context.Context, sid string, t proto.SSHTarget) {
+	status := func(st, note string) {
+		a.postOut(context.Background(), sid, proto.OutMessage{Status: st, Note: note})
+	}
+	fail := func(err error) {
+		log.Printf("ssh %s: %v", sid, err)
+		status(proto.SSHErr, err.Error())
+		a.postOut(context.Background(), sid, proto.OutMessage{Data: b64.EncodeToString([]byte("\x1b[31m" + err.Error() + "\x1b[0m\r\n"))})
+		a.postOut(context.Background(), sid, proto.OutMessage{Exit: true})
+	}
+	client, fp, err := a.sshConnect(parent, t, status)
+	if err != nil {
+		fail(err)
+		return
+	}
+	port := t.Port
+	if port == 0 {
+		port = 22
+	}
+	addr := net.JoinHostPort(t.Host, strconv.Itoa(port))
 	sess, err := client.NewSession()
 	if err != nil {
 		client.Close()