Re: [PATCH v2 2/3] replace-objects: create wrapper around setting

[René Scharfe <l.s.r@xxxxxx>]

Am 02.06.23 um 16:29 schrieb Derrick Stolee via GitGitGadget:
> diff --git a/replace-object.c b/replace-object.c
> index ceec81c940c..cf91c3ba456 100644
> --- a/replace-object.c
> +++ b/replace-object.c
> @@ -85,7 +85,14 @@ const struct object_id *do_lookup_replace_object(struct repository *r,
>  	die(_("replace depth too high for object %s"), oid_to_hex(oid));
>  }
>
> +static int read_replace_refs = 1;
> +

This breaks compilation:

   replace-object.c:88:12: error: static declaration of 'read_replace_refs' follows non-static declaration
   static int read_replace_refs = 1;
              ^
   ./replace-object.h:14:12: note: previous declaration is here
   extern int read_replace_refs;
              ^

And this variable is still referenced in two more places outside this
file, which won't work now that it has become static (file-scoped):

   $ git grep read_replace_refs
   builtin/commit-graph.c:extern int read_replace_refs;
   config.c:               read_replace_refs = git_config_bool(var, value);
   replace-object.c: * references, regardless of the value of read_replace_refs.
   replace-object.c:static int read_replace_refs = 1;
   replace-object.c:       read_replace_refs = 0;
   replace-object.c:       return read_replace_refs;
   replace-object.h:extern int read_replace_refs;

Perhaps postpone adding "static" to patch 3?

>  void disable_replace_refs(void)
>  {
>  	read_replace_refs = 0;
>  }
> +
> +int replace_refs_enabled(struct repository *r)
> +{
> +	return read_replace_refs;
> +}
> diff --git a/replace-object.h b/replace-object.h
> index 7786d4152b0..b141075023e 100644
> --- a/replace-object.h
> +++ b/replace-object.h
> @@ -27,6 +27,19 @@ void prepare_replace_object(struct repository *r);
>  const struct object_id *do_lookup_replace_object(struct repository *r,
>  						 const struct object_id *oid);
>
> +
> +/*
> + * Some commands disable replace-refs unconditionally, and otherwise each
> + * repository could alter the core.useReplaceRefs config value.
> + *
> + * Return 1 if and only if all of the following are true:
> + *
> + *  a. disable_replace_refs() has not been called.
> + *  b. GIT_NO_REPLACE_OBJECTS is unset or zero.
> + *  c. the given repository does not have core.useReplaceRefs=false.
> + */
> +int replace_refs_enabled(struct repository *r);
> +
>  /*
>   * If object sha1 should be replaced, return the replacement object's
>   * name (replaced recursively, if necessary).  The return value is
> @@ -41,7 +54,7 @@ const struct object_id *do_lookup_replace_object(struct repository *r,
>  static inline const struct object_id *lookup_replace_object(struct repository *r,
>  							    const struct object_id *oid)
>  {
> -	if (!read_replace_refs ||
> +	if (!replace_refs_enabled(r) ||
>  	    (r->objects->replace_map_initialized &&
>  	     r->objects->replace_map->map.tablesize == 0))
>  		return oid;