maas.py 文件源码

def install_maas_cli(self):
        """Ensure maas-cli is installed

        Fallback to MAAS stable PPA when needed.
        """
        apt.init()
        cache = apt.Cache()

        try:
            pkg = cache['maas-cli']
        except KeyError:
            cmd = ['add-apt-repository', '-y', MAAS_STABLE_PPA]
            subprocess.check_call(cmd)
            cmd = ['apt-get', 'update']
            subprocess.check_call(cmd)
            self.install_maas_cli()
            return

        if not pkg.current_ver:
            apt_install('maas-cli', fatal=True)