我想在pyqt5中实现进度条下载git repo

import sys
import os
import subprocess
from PyQt5.QtWidgets import QApplication, QMainWindow, QProgressBar, QPushButton, QLabel
from PyQt5.QtCore import Qt, QThread, pyqtSignal

class GitCloneThread(QThread):
    progress_updated = pyqtSignal(int)

    def __init__(self, repo_url, save_path):
        super().__init__()
        self.repo_url = repo_url
        self.save_path = save_path

    def run(self):
        cmd = ['git', 'clone', self.repo_url, self.save_path]
        process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        total_bytes = 0
        downloaded_bytes = 0

        while True:
            line = process.stdout.readline().decode().strip()
            if not line:
                break

            if 'Receiving objects' in line:
                total_bytes = int(line.split()[2])

            if 'Receiving objects' in line or 'Resolving deltas' in line:
                downloaded_bytes += len(line)

            progress = int(downloaded_bytes / total_bytes * 100)
            self.progress_updated.emit(progress)

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('Git Repo Downloader')
        self.setGeometry(100, 100, 400, 150)

        self.progress_bar = QProgressBar(self)
        self.progress_bar.setGeometry(30, 40, 340, 25)

        self.download_button = QPushButton('Download', self)
        self.download_button.setGeometry(30, 80, 100, 30)
        self.download_button.clicked.connect(self.start_download)

        self.status_label = QLabel(self)
        self.status_label.setGeometry(150, 80, 220, 30)
        self.status_label.setAlignment(Qt.AlignCenter)

    def start_download(self):
        repo_url = 'https://github.com/your/repo.git'
        save_path = '/path/to/save/repo'
        self.download_button.setEnabled(False)

        self.git_thread = GitCloneThread(repo_url, save_path)
        self.git_thread.progress_updated.connect(self.update_progress)
        self.git_thread.finished.connect(self.download_finished)
        self.git_thread.start()

    def update_progress(self, progress):
        self.progress_bar.setValue(progress)
        self.status_label.setText(f'Downloading... {progress}%')

    def download_finished(self):
        self.download_button.setEnabled(True)
        self.status_label.setText('Download finished!')

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())