[racket] Sandbox needs to access preferences? Why?

From: Eric Hanchrow (eric.hanchrow at gmail.com)
Date: Tue Mar 13 17:29:42 EDT 2012

I've seen this occasionally too from rudybot; I'll see if I can get a
stacktrace next time it happens (doubtful but you never know).

On Tue, Mar 13, 2012 at 1:48 PM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> Do you get a stacktrace with the error?
> Robby
> On Tue, Mar 13, 2012 at 3:06 PM, Jordan Johnson <jmj at fellowhuman.com> wrote:
>> Hi all,
>> I'm trying to write a checker script for the handin server (which is running on my Mac), and when i try handing an assignment in to it, I am getting the error that read access to my preferences file is denied:
>>  ERROR: file-or-directory-modify-seconds: 'read' access denied for
>>    /Users/myusername/Library/Preferences/org.racket-lang.prefs.rktd
>> In the checker I am creating two evaluators, one using make-evaluator/submission and the other using make-module-evaluator.  I have determined that this definition is provoking the error:
>> ;;
>> (define-values (asg-eval solution-eval)
>>          (parameterize ([sandbox-namespace-specs
>>                           (list make-base-namespace 'hw/solutions)])
>>            (values
>>             (make-evaluator/submission
>>              '(special intermediate)
>>              '()
>>              submission)
>>             (make-module-evaluator (build-path asg-dir "solution.rkt")))))
>> ;;
>> submission is bound by the handin server's check: macro, and asg-dir is defined thus:
>> (define asg-dir (build-path server-dir "my-handin-directory-here"))
>> where server-dir is also provided by the handin server.  solution.rkt is a file I have written in ISL, which depends only on 2htdp/image and a library I've linked as hw/solutions.
>> Can you identify what may be triggering the attempt to read preferences, and how I can either avoid it or grant appropriate read permissions?  Thanks...
>> Best,
>> Jordan
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