facade.py 文件源码

def wait_child(self):
        """Override to find out whether dpkg exited or not.

        The C{run()} method returns os.WEXITSTATUS(res) without checking
        os.WIFEXITED(res) first, so it can signal that everything is ok,
        even though something causes dpkg not to exit cleanly.

        Save whether dpkg exited cleanly into the C{dpkg_exited}
        attribute. If dpkg exited cleanly the exit code can be used to
        determine whether there were any errors. If dpkg didn't exit
        cleanly it should mean that something went wrong.
        """
        res = super(LandscapeInstallProgress, self).wait_child()
        self.dpkg_exited = os.WIFEXITED(res)
        return res