container.py 文件源码

def shell(self, username=None, cmd_args=[]):
        """ Opens a new interactive shell in the container. """
        # We run this in case our lxdock.yml config was modified since our last `lxdock up`.
        self._setup_env()

        # For now, it's much easier to call `lxc`, but eventually, we might want to contribute
        # to pylxd so it supports `interactive = True` in `exec()`.
        shellcfg = self.options.get('shell', {})
        shelluser = username or shellcfg.get('user')
        if shelluser:
            # This part is the result of quite a bit of `su` args trial-and-error.
            shellhome = shellcfg.get('home') if not username else None
            homearg = '--env HOME={}'.format(shellhome) if shellhome else ''
            cmd = 'lxc exec {} {} -- su -m {}'.format(self.lxd_name, homearg, shelluser)
        else:
            cmd = 'lxc exec {} -- su -m root'.format(self.lxd_name)

        if cmd_args:
            # Again, a bit of trial-and-error.
            # 1. Using `su -s SCRIPT_FILE` instead of `su -c COMMAND` because `su -c` cannot
            #    receive SIGINT (Ctrl-C).
            #    Ref: //sethmiller.org/it/su-forking-and-the-incorrect-trapping-of-sigint-ctrl-c/
            #    See also: //github.com/lxdock/lxdock/pull/67#issuecomment-299755944
            # 2. Applying shlex.quote to every argument to protect special characters.
            #    e.g.: lxdock shell container_name -c echo "he re\"s" '$PATH'

            self._guest.run(['mkdir', '-p',
                             str(PurePosixPath(self._guest_shell_script_file).parent)])
            self._container.files.put(self._guest_shell_script_file, textwrap.dedent(
                """\
                #!/bin/sh
                {}
                """.format(' '.join(map(shlex.quote, cmd_args)))))
            self._guest.run(['chmod', 'a+rx', self._guest_shell_script_file])
            cmd += ' -s {}'.format(self._guest_shell_script_file)

        subprocess.call(cmd, shell=True)