python - 如何使用 apt.progress 类检查 python_apt 中 commit() 的进度？

Question

我正在检查 python_apt 提供的这段代码，但它似乎有点过时了:

https://github.com/jolicloud/python-apt/blob/master/doc/examples/inst.py

我在这里要做的就是跟踪 commit() 方法的进度；目前，当我们调用 commit() 并传入 fprogress 和 iprogress 时，我可以在控制台上看到 pkg_list 中的所有包 下载正确，问题出现在这之后。

程序继续执行，它没有像我认为应该的那样触发 dpkg_status_change()？

不知道多个包安装是否成功？

import apt 
from apt.progress.base import InstallProgress

    class InstallStatusUpdate(InstallProgress):

            def conffile(self, current, new):
                print "conffile prompt: %s %s" % (current, new)

            def processing(self, pkg, stage):
                print "Processing ", pkg, " stage: ", stage

            def error(self, pkg, errormsg):
                print "Package ", pkg, " error: ", errormsg

            def finish_update(self):
                print "Installation is complete"

            def status_change(self, pkg, percent, status):
                print "Package: ", pkg, " at ", percent, " -> ", status

            def dpkg_status_change(self, pkg, status):
                print "Package ", pkg, ", Status: ", status



    def install_updates(self, pkg_list):
            fprogress = apt.progress.TextFetchProgress()
            iprogress = InstallStatusUpdate()

            cache_tmp = apt.Cache()
            cache_tmp.update()
            cache_tmp.open(None)

            for pkg in pkg_list:
                try:
                    self.pkgname = cache_tmp[pkg.name]
                    if self.pkgname.is_installed and self.pkgname.is_upgradable:
                        self.pkgname.mark_upgrade()
                    else:
                        self.pkgname.mark_install()
                except Exception as e:
                    print e.message

            result = self.pkgname.commit(fprogress, iprogress)
            #Maybe i'm doing something wrong here but result always = None...

Answer 1

显然使用 python_apt commit() 很痛苦，我最终使用 subprocess 等待一切完成(就像它应该be) 并在最后解析输出以验证包确实已升级。

在 _apt_update() 中，我在尝试 apt-get update 之前检查以确保系统在线，然后继续安装传递给 _apt_install()。

 def _apt_update(self):
        import urllib2

        try:
            response = urllib2.urlopen('http://74.125.113.99', timeout=1)
            #We have internet access
            subprocess.Popen(['apt-get', 'update'])
            return True
        except urllib2.URLError as err: pass
        return False

 def _apt_install(self, pkg, update=True):
        upgraded = 0

        if update == True:
            self._apt_update()

        proc = subprocess.Popen(['apt-get', 'install', pkg, "-y"], stdout=subprocess.PIPE)
        for line in proc.stdout:
            if "upgraded" in line and "newly installed" in line and "to remove" in line:
                values = line.split(",")
                for pos in values:
                    key, value = pos.split(" ")
                    if value == "upgraded":
                        upgraded = int(key)
                    break

        print "Upgraded OK (", upgraded, ")"
        if upgraded > 0:
            return True
        else:
            return False