bug/feature in code_server.erl

[Corrado Santoro]

But the "." dir is still in the path, and your current dir is 
"/home/mbj/src". So, what's the problem here?

--Corrado

Martin Bjorklund wrote:
> Hi,
> 
> code:del_path() doesn't behave as expected:
> 
> nassa src> ls /home/mbj/src/a.beam 
> /home/mbj/src/a.beam
> 
> nassa src> erl -pa /home/mbj/src 
> Erlang (BEAM) emulator version 5.4.10 [source] [hipe]
> 
> Eshell V5.4.10  (abort with ^G)
> 1> code:get_path().
> ["/home/mbj/src",
>  ".",
>  "/home/mbj/src/otp_src_R10B-8/installed/lib/erlang/lib/kernel-2.10.11/ebin",
>   <OTP dirs removed>
> 
> 2> code:del_path("/home/mbj/src").
> true
> 3> code:which(a).
> non_existing
> 4> code:load_file(a).
> {module,a}
> 5> code:which(a).    
> "/home/mbj/src/a.beam"
> 
> 6> code:get_path().
> [".",
>  "/home/mbj/src/otp_src_R10B-8/installed/lib/erlang/lib/kernel-2.10.11/ebin",
>   <OTP dirs removed>
> 
> 
> 
> In 1. we see that /home/mbj/src is in the path
> In 2. /home/mbj/src is deleted
> In 3. we can see that a.beam is not found in the path
> In 4. we can still load a.beam, from /home/mbj/src, although
> /home/mbj/src is not in the path.
> 
> 
> [browsing code_server.erl...]
> 
> The problem is in code_server:mod_to_bin's last clause:
> 
> mod_to_bin([], Mod) ->
>     %% At last, try also erl_prim_loader's own method
>     File = code_aux:to_path(Mod) ++ code_aux:objfile_extension(),
>     case erl_prim_loader:get_file(File) of
> 
> And it turns out that /home/mbj/src is in erl_prim_loader's path,
> since it was added with -pa.
> 
> But why is this clause here?  code_server grabs the path from
> erl_prim_loader at startup, and after that code should be loaded
> according to the path in code_server.
> 
> The workaround for me is to clear erl_prim_loader's path.
> 
> 
> 
> /martin
> 

-- 
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Eng. Corrado Santoro, Ph.D.

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