覆盖SCons缓存复制功能 [英] Overriding SCons Cache Copy Function

问题描述

我试图弄清楚当SCons将工件从缓存目录(由CacheDir提供)复制到使用的硬链接时，如何覆盖行为.

I'm trying to figure out how to override the behaviour when SCons copies artifacts from the cache directory (given by CacheDir) to used hard-links.

我目前的尝试

def link_or_copy_file(class_instance, src, dst):
    # do hardlinking instead...

SCons.Defaults.DefaultEnvironment()._copy_from_cache = link_or_copy_file
SCons.Defaults.DefaultEnvironment()._copy2_from_cache = link_or_copy_file

env = Environment()

env._copy_from_cache = link_or_copy_file
env._copy2_from_cache = link_or_copy_file

对env的后续使用没有影响.永远不会调用功能link_or_copy_file.怎么了?

has no effect on subsequent usage of env. The function link_or_copy_file is never called. What is wrong?

不可能以这种方式覆盖Python类成员函数.

Isn't it possible to override a Python class member function in this way.

更新:另请注意，在调用env.Decider()之后，我正在执行此操作，因为此函数可能会覆盖成员_copy_from_cache和_copy2_from_cache.

Update: Also note that I'm doing this after env.Decider() has been called as this function possibly overrides the members _copy_from_cache and _copy2_from_cache.

推荐答案

我们终于弄清楚了

import SCons.Environment
SCons.Environment.Environment._copy_from_cache = link_or_copy_file
SCons.Environment.Environment._copy2_from_cache = link_or_copy_file

工作.

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