使用Fabric在远程shell中运行（）调用时，是否可以捕获错误代码？ [英] Can I catch error codes when using Fabric to run() calls in a remote shell?

问题描述

通常，一旦run（）调用返回一个非零退出代码，Fabric就会退出。然而，对于一些电话，这是预期的。例如，当无法压缩文件时，PNGOut会返回错误代码2。

Normally Fabric quits as soon as a run() call returns a non-zero exit code. For some calls, however, this is expected. For example, PNGOut returns an error code of 2 when it is unable to compress a file.

目前，我只能通过使用shell逻辑来规避此限制（ do_something_that_fails || true 或 do_something_that_fails || do_something_else ），但我宁可将我的逻辑保留在简单的Python（as是织物承诺）。

Currently I can only circumvent this limitation by either using shell logic (do_something_that_fails || true or do_something_that_fails || do_something_else), but I'd rather be able to keep my logic in plain Python (as is the Fabric promise).

有没有办法检查错误代码并对其做出反应，而不是使面料恐慌死亡？我仍然希望其他调用的默认行为，因此通过修改环境来改变它的行为看起来不是一个好的选择（就我而言，只要使用它来告诉它，而不是要死）。

Is there a way to check for an error code and react to it rather than having Fabric panic and die? I still want the default behaviours for other calls, so changing its behaviour by modifying the environment doesn't seem like a good option (and as far as I recall, you can only use that to tell it to warn instead of dying anyway).

推荐答案

您可以通过使用设置来防止非零退出代码中止上下文管理器和 warn_only 设置：

You can prevent aborting on non-zero exit codes by using the settings context manager and the warn_only setting:

from fabric.api import settings

with settings(warn_only=True):
    result = run('pngout old.png new.png')
    if result.return_code == 0: 
        do something
    elif result.return_code == 2: 
        do something else 
    else: #print error to user
        print result
        raise SystemExit()

更新：我的答案已经过时了。见下面的评论。

Update: My answer is outdated. See comments below.

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