pexpect - 通过 ssh 运行 script.sh

Question

我在通过 ssh 以编程方式运行本地脚本时遇到问题。
我不确定这是否是本地主机上的 shell 变量替换的问题。

手动运行时，

ssh monit@server1 'bash -s' < /u02/splunk/splunk/etc/apps/Splunk_TA_nix/bin/cpu.sh

我得到了预期的输出，

CPU pctUser pctNice pctSystem pctIowait pctIdle
全部 11.21 0.00 1.50 0.31 86.98
0 0.00 0.00 0.00 0.00 100.00
1 3.00 0.00 1.00 0.00 96.00 ....

但我明白了

bash: /u02/splunk/splunk/etc/apps/Splunk_TA_nix/bin/cpu.sh: 没有这样的文件或目录

运行以下代码时，

splunk_bin_dir = '/u02/splunk/splunk/etc/apps/Splunk_TA_nix/bin'
hostname = 'server1'
username = 'monit'
password = 'monit#_'


command = "/usr/bin/ssh %(username)s@%(hostname)s 'bash -s' < %(splunk_bin_dir)s/cpu.sh" % locals()
print command

ssh_new_conn = 'Are you sure you want to continue connecting'

p = pexpect.spawn(command, timeout=360)
# Handles the 3 possible connection outcomes:
# a) Ssh to the remote host for the first time, triggering 'Are you sure you want to continue connecting'
# b) ask you for password
# c) No password is needed at all, because you already have the key.
i = p.expect([ssh_new_conn,'[pP]assword:',pexpect.EOF])
print ' Initial pexpect command output: ', i
if i == 0:
    # send 'yes'
    p.sendline('yes')
    i = p.expect(['[pP]assword:',pexpect.EOF])
    print 'sent yes. pexpect command output', i
    if i == 0:
        # send the password
        p.sendline(password)
        p.expect(pexpect.EOF)
elif i == 1:
    # send the password
    p.sendline(password)
    p.expect(pexpect.EOF)
elif i == 2:
    print "pexpect faced key or connection timeout"
    pass

print p.before

这些是打印输出，

/usr/bin/ssh monit@server1 'bash -s' 初始 pexpect 命令输出：1
bash: /u02/splunk/splunk/etc/apps/Splunk_TA_nix/bin/cpu.sh: 没有这样的文件或目录

pexpect 碰到了 [pP] 密码行，所以我猜密码被正确传递了，

Answer 1

这里是来自 pexpect 手册的注释：

请记住，Pexpect 不会解释 shell 元字符，例如 重定向、管道或通配符（>、| 或 *）。这是一个常见的错误。 如果你想运行一个命令并通过另一个命令传递它，那么 您还必须启动一个 shell。

这是工作线

command = """/bin/bash -c "/usr/bin/ssh  %(username)s@%(hostname)s 'bash -s' < %(splunk_bin_dir)s/cpu.sh" """ % locals()