Question

我需要在python中执行此命令并从键盘输入密码，这是有效的：

import os
cmd = "cat /home/user1/.ssh/id_rsa.pub | ssh user2@host.net \'cat >> .ssh/authorized_keys\' > /dev/null 2>&1"
os.system(cmd)

如您所见，我希望通过ssh将公钥附加到远程主机请参见此处：equivalent-of-ftp-put-and-append-in-scp和此处：copy-and-append-files-to-a-remote-machine-cat-error

当然我希望它在没有用户输入的情况下完成它我尝试了pexpect并且我认为命令对它来说很奇怪：

import pexpect

child = pexpect.spawn(command=cmd, timeout=10, logfile=open('debug.txt', 'a+'))
matched = child.expect(['Password:', pexpect.EOF, pexpect.TIMEOUT])
if matched == 0:
    child.sendline(passwd)

在debug.txt中：

ssh-rsa AAAA..........vcxv233x5v3543sfsfvsv user1@host1
/bin/cat: |: No such file or directory
/bin/cat: ssh: No such file or directory
/bin/cat: user2@host.net: No such file or directory
/bin/cat: cat >> .ssh/authorized_keys: No such file or directory
/bin/cat: >: No such file or directory
/bin/cat: 2>&1: No such file or directory

我看到两个解决方案：

修复pexpect的命令，它将整个字符串识别为一个命令或
将passwd作为假用户注入/写入stdin，但是如何！？！？

Answer 1

来自the pexpect docs：

请记住，Pexpect不会解释shell元字符，例如重定向，管道或外卡（>，|或*）。这是一个常见的错误。如果要运行命令并通过它另一个命令然后你还必须启动一个shell。例如::
child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > logs.txt"')
child.expect(pexpect.EOF)

Answer 2

这对我有用：

command = "/bin/bash -c \"cat /home/user1/.ssh/id_rsa.pub | ssh user2@host.net \'cat >> ~/.ssh/authorized_keys\' > /dev/null 2>&1\""
child = spawn(command=command, timeout=5)

如何在命令中将命令传递给python中的pexpext

2 个答案: