SSHCommandClientEndpoint，扭曲。如何执行多个命令？

Question

我需要执行一些 ssh 命令。我找到了一些例子，但它是针对一个命令的，例如'pwd'：

endpoint = SSHCommandClientEndpoint.newConnection(reactor, 'pwd',
                                            username, host, port,
                                            password=password,
                                            agentEndpoint=agent
                                        )
factory = MonitoringFactory()
d = endpoint.connect(factory)
d.addCallback(lambda protocol: protocol.finished)

我应该怎么做才能执行 2 个命令，例如 'pwd'、'ls'。我应该做2个端点吗？会是对的吗？但它会建立 2 个 ssh 连接，不是吗？在我看来，应该有另一种方式来做我想做的事。

Answer 1

使用SSHCommandClientEndpoint.existingConnection 通过单个 SSH 连接运行多个命令。

from twisted.conch.endpoints import SSHCommandClientEndpoint
from twisted.internet.endpoints import connectProtocol

# Open a connection with a long-running command so that the connection
# is re-usable for other commands indefinitely.
command = b"cat"

endpoint = SSHCommandClientEndpoint.newConnection(
    reactor, command, username, host, port,
    password=password, agentEndpoint=agent)

connecting = connectProtocol(endpoint, Protocol())
def connected(protocol):
    conn = protocol.transport.conn
    a = SSHCommandClientEndpoint.existingConnection(conn, b"pwd")
    b = SSHCommandClientEndpoint.existingConnection(conn, b"...")
    c = SSHCommandClientEndpoint.existingConnection(conn, b"...")
    ...
connecting.addCallback(connected)
...

请记住，这些命令仍然不在同一个 shell 会话中运行。因此，您可能不一定会发现像 pwd 这样的命令非常有用。

如果你想在单个 shell 会话中运行多个命令，那么你需要使用 shell 来组合命令：

# Open a connection with a long-running command so that the connection
# is re-usable for other commands indefinitely.
command = b"pwd; ls foo; cd /tmp"

endpoint = SSHCommandClientEndpoint.newConnection(
    reactor, command, username, host, port,
    password=password, agentEndpoint=agent)

...