Re: [PATCH 1/3] repository: create disable_replace_refs()

> From: Derrick Stolee <derrickstolee@github.com>
> 
> Several builtins depend on being able to disable the replace references
> so we actually operate on each object individually. These currently do
> so by directly mutating the 'read_replace_refs' global.
> 
> A future change will move this global into a different place, so it will
> be necessary to change all of these lines. However, we can simplify that
> transition by abstracting the purpose of these global assignments with a
> method call.
> 
> We will never scope this to an in-memory repository as we want to make
> sure that we never use replace refs throughout the life of the process
> if this method is called.
> 

> +/*
> + * Some commands override config and environment settings for using
> + * replace references. Use this method to disable the setting and ensure
> + * those other settings will not override this choice. This applies
> + * globally to all in-process repositories.
> + */
> +void disable_replace_refs(void);
> +