如何使用 pexpect 附加到远程服务器上的文件

Question

我正在尝试将 public 密钥附加到远程服务器上的授权密钥文件中，但它不起作用。尽管没有错误，但似乎并没有将输出重定向到文件。这是我的代码：

print "DEGUG: ===  append to authorized keys  START ==="
print "DEBUG:  sending echo <local public key> >> /root/.ssh/authorized_keys"
print "        local public key: " + local_public_key
child.sendline('echo ' + local_public_key + ' >> /root/.ssh/authorized_keys')
child.expect(prompt)
child.expect(prompt)
child.sendline('echo $?')
child.expect(prompt)
ec = child.before.strip()
print("exit code: >>>>" + str(ec) + "<<<<")
print "DEGUG: ===  append to authorized keys  END ==="

这是输出：

DEGUG: ===  append to authorized keys  START ===
DEBUG:  sending echo <local public key> >> /root/.ssh/authorized_keys
    local public key: ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAQEAy408yT80SP2x9rZkR56j4wsbpqUSYOW1uY8Lf4XfJLinbtcpwyyYGJCuNbA30ve1+Lt/AJ2d1VdSAS4Afu1LKucFmj2lN8dqKWsCUBYXXtkUHILVelRTglMGFLTbLJofXYwUXA60UWWilYvWJ2j4HRjHgxUP7i0fYy4ruy5zpspZ8Svr+PMY9UjA3HSnPhFB2ZHkC+9kzexfVCM7nvKw9LekxY0x/BrD5z6D+652sr8A9EOgBsg9A/soL4JMycdWmTBDe16O5f4Db5Qt7oqn3Hbw7lki1XULIvTzyNhUtoiGiQiCbCh7G1ba+IccvfrIaK+kpmugeoaTC4zldXEGbw==

echo ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAQEAy408yT80SP2x9rZkR56j4wsbpqUSYOW1uY8Lf4XfJLinbtcpwyyYGJCuNbA30ve1+Lt/AJ2d1VdSAS4Afu1LKucFmj2lN8dqKWsCUBYXXtkUHILVelRTglMGFLTbLJofXYwUXA60UWWilYvWJ2j4HRjHgxUP7i0fYy4ruy5zpspZ8Svr+PMY9UjA3HSnPhFB2ZHkC+9kzexfVCM7nvKw9LekxY0x/BrD5z6D+652sr8A9EOgBsg9A/soL4JMycdWmTBDe16O5f4Db5Qt7oqn3Hbw7lki1XULIvTzyNhUtoiGiQiCbCh7G1ba+IccvfrIaK+kpmugeoaTC4zldXEGbw==
 >> /root/.ssh/authorized_keys
R56j4wsbpqUSYOW1uY8Lf4XfJLinbtcpwyyYGJCuNbA30ve1+Lt/AJ2d1VdSAS4Afu1LKucFmj2lN8dqKWsCUBYXXtkUHILVelRTglMGFLTbLJofXYwUXA60UWWilYvWJ2j4HRjHgxUP7i0fYy4ruy5zpspZ8Svr+PMY9UjA3HSnPhFB2ZHkC+9kzexfVCM7nvKw9LekxY0x/BrD5z6D+652sr8A9EOgBsg9A/soL4JMycdWmTBDe16O5f4Db5Qt7oqn3Hbw7lki1XULIvTzyNhUtoiGiQiCbCh7G1ba+IccvfrIaK+kpmugeoaTC4zldXEGbw==
ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAQEAy408yT80SP2x9rZkR56j4wsbpqUSYOW1uY8Lf4XfJLinbtcpwyyYGJCuNbA30ve1+Lt/AJ2d1VdSAS4Afu1LKucFmj2lN8dqKWsCUBYXXtkUHILVelRTglMGFLTbLJofXYwUXA60UWWilYvWJ2j4HRjHgxUP7i0fYy4ruy5zpspZ8Svr+PMY9UjA3HSnPhFB2ZHkC+9kzexfVCM7nvKw9LekxY0x/BrD5z6D+652sr8A9EOgBsg9A/soL4JMycdWmTBDe16O5f4Db5Qt7oqn3Hbw7lki1XULIvTzyNhUtoiGiQiCbCh7G1ba+IccvfrIaK+kpmugeoaTC4zldXEGbw==
[root@slccaa01cn01 ~]#  >> /root/.ssh/authorized_keys
[root@slccaa01cn01 ~]# echo $?
echo $?
0
[root@slccaa01cn01 ~]# exit code: >>>>echo $?
0
[root@slccaa01cn01 ~]<<<<
DEGUG: ===  append to authorized keys  END ===

当我在远程检查 authorized_keys 文件时，没有添加新密钥。 似乎密钥被回显到标准输出而不是写入文件。不知道如何解决这个问题。

Answer 1

您似乎忘记删除 local_public_key 中尾随的 \n 字符。所以像这样尝试：

child.sendline('echo ' + local_public_key.strip() + ' >> /root/.ssh/authorized_keys')
#                                        ^^^^^^^^

如何使用 pexpect 附加到远程服务器上的文件

How to append to a file on remote server with pexpect

python

pexpect