如何通过远程服务器上的结构替换文件字符串？

Question

我想用fabric来替换远程服务器文件字符串。下面的代码。

def readsn():

    with open(hn) as f:
        while True:
            line=f.readline()
            if not line:
                break
            desthost = line.strip().lstrip().rstrip()
            env.host_string = desthost
            run('cp %s %s' %(path,path+time.strftime(r'%Y%m%d%H%M%S', time.localtime())))
            run(change_conf(path, old, new))

def change_conf(path,old,new):
    f = fileinput.input(path,backup='.bak',inplace=True)
    for line in f:
        line = line.rstrip()
        match = re.match(r,line)
        if match:
            print line.replace(old, new)
        print line
    f.close()

我收到以下错误：

Traceback (most recent call last):
  File "change_conf_batch.py", line 45, in <module>
    readsn()
  File "change_conf_batch.py", line 32, in readsn
    run(change_conf(path, old, new))
  File "/root/.pythonbrew/venvs/Python-2.7.10/flask/lib/python2.7/site-packages/fabric/network.py", line 677, in host_prompting_wrapper
    return func(*args, **kwargs)
  File "/root/.pythonbrew/venvs/Python-2.7.10/flask/lib/python2.7/site-packages/fabric/operations.py", line 1088, in run
    shell_escape=shell_escape, capture_buffer_size=capture_buffer_size,
  File "/root/.pythonbrew/venvs/Python-2.7.10/flask/lib/python2.7/site-packages/fabric/operations.py", line 914, in _run_command
    _prefix_env_vars(_prefix_commands(command, 'remote')),
  File "/root/.pythonbrew/venvs/Python-2.7.10/flask/lib/python2.7/site-packages/fabric/operations.py", line 670, in _prefix_commands
    return prefix + command
TypeError: cannot concatenate 'str' and 'NoneType' objects

Answer 1

run() 需要带有命令的字符串。它只能运行远程服务器上的 programs/scripts - 它不能运行你的功能。

顺便说一句：现在 Python 首先执行你的函数 returns None 然后 run() 使用这个结果作为命令在服务器上执行。

如果您在远程服务器上有 Linux，那么您可以使用 sed 命令。即

run('sed "s/old_text/new_text/g" old_file > new_file')

或者您必须在远程服务器上复制您的脚本，然后运行它

您也可以从服务器下载文件(get()), change it locally (using your function) and send back on server (put())

如何通过远程服务器上的结构替换文件字符串？

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