[Nix-dev] builtins.toPath returns ... a string?

[Kirill Elagin]

The relevant commit is this:
https://github.com/NixOS/nix/commit/d7efd7639420f4c840cbfdfcbbb3c45292f3ac54
Looks like `toPath` is not only obsolete, but prohibited since semantics of
paths changed and now it makes no sense no convert something to a path.


--
Кирилл Елагин


On Thu, May 22, 2014 at 7:49 PM, Marc Weber <marco-oweber at gmx.de> wrote:

> --eval-only --strict -xml output:
>
> of
>
>   {
>     s = "/home";
>     p = /home;
>     to_p = builtins.toPath "/home";
>   }
>
> Same
>
>   || <?xml version='1.0' encoding='utf-8'?>
>   || <expr>
>   ||   <attrs>
>   ||     <attr column="3" line="3" name="p" path="/tmp/test.nix">
>   ||       <path value="/home" />
>   ||     </attr>
>   ||     <attr column="3" line="2" name="s" path="/tmp/test.nix">
>   ||       <string value="/home" />
>   ||     </attr>
>   ||     <attr column="3" line="4" name="to_p" path="/tmp/test.nix">
>   ||       <string value="/home" />
>   ||     </attr>
>   ||   </attrs>
>   || </expr>
>
>
> primops.cc
>
>   /* Convert the argument to a path.  !!! obsolete? */
>   static void prim_toPath(EvalState & state, const Pos & pos, Value * *
> args, Value & v)
>   {
>       PathSet context;
>       Path path = state.coerceToPath(pos, *args[0], context);
>       mkString(v, canonPath(path), context);
>   }
>
> You may want to talk about your use case.
>
> Marc Weber
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>
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