[racket-dev] no symlinks in planet links (was: Re: single-instantiation trick: kludgy workaround for planet packages?)

From: John Clements (clements at brinckerhoff.org)
Date: Wed Oct 6 17:19:24 EDT 2010

On Oct 5, 2010, at 7:37 PM, Ryan Culpepper wrote:

> John Clements wrote:
>> On Oct 5, 2010, at 3:25 PM, Ryan Culpepper wrote:
>>> It looks like you're using a PLaneT development link. Perhaps that's the source of the problem?
>>> How about dropping the following code into drracket-link.rkt so it prints out its (absolute) resolved module path when it gets required from the tool.
>>> (eprintf "drracket-link.rkt = ~s\n"
>>>          (resolved-module-path-name
>>>           (variable-reference->resolved-module-path
>>>            (#%variable-reference))))
>> wait... isn't that part of the error message I attached earlier?  Viz:
>> namespace-attach-module: unknown module (in the source namespace): #<resolved-module-path:"/Users/clements/clements/planet-collects/rsound/private/drracket-link.rkt">
> No, that's based on the absolute module path you passed to namespace-attach module.
> What I'm wondering about is, when you use the relative require, what does the module think its resolved module path is. That's what the expression above is designed to show.

Fooey.  Okay, here's what I get:

pcp062719pcs:~/git-clements clements$ drracket-link.rkt = #<path:/Users/clements/git-clements/clements/planet-collects/rsound/private/drracket-link.rkt>
namespace-attach-module: unknown module (in the source namespace): #<resolved-module-path:"/Users/clements/clements/planet-collects/rsound/private/drracket-link.rkt">


The difference between these is a symbolic link from ~/clements/planet-collects to ~/git-clements/clements/planet-collects.

.... aaand, sure enough, re-creating the link using a fully-expanded path solves this problem.

So, it looks like planet is broken wrt planet-links containing symbolic links.  Maybe you could solve this by just putting a fully-expand-path-mumble somewhere very early in the signal chain? ... Hmm, actually that might not be such a great idea; you break the abstraction of the symbolic link from the standpoint of the user.



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