Following up my earlier post with more detail -- pardon the length, but I want
to be sure of giving enough info to allow a useful answer:
I'm using Racket 5.3.1 on OS X and a fresh copy of the handin-server
collection, recently downloaded from the Racket git repo (and configured with
"raco setup -l handin-server"), and encountering two problems in my attempts to
write a checker script:
-- 1 --
Starting a checker file with "#lang handin-server/checker" (as the
handin-server/checker docs suggest) does not work; the log file indicates the
server is failing to load the checker, with this error:
standard-module-name-resolver: collection not found
collection: "handin-server/checker/lang"
Using "#lang s-exp handin-server/checker" seems to work, but I can't tell if
there are other related problems that this fix is merely hiding.
-- 2 --
I can create and run checker files that define a trivial checker function
explicitly (i.e., without using the "check:" form from handin-server/checker),
but it appears that if I do anything that creates an evaluator -- be it using
make-evaluator/submission (or the other make-evaluator* functions, whether I'm
require'ing them from handin-server/sandbox or directly from racket/sandbox) or
using "check:" -- when the client attempts to hand in, I get an error from
namespace-attach-module, quoted below in my original message. For example, this
triggers the error:
#lang racket
(require racket/sandbox)
(provide checker)
(define (checker users submission)
(define e (make-evaluator '(special beginner)))
"save-it-here.rkt")
If I comment out the (define e ...) line above, the handin runs as specified in
the docs. Changing the evaluator's language makes no visible difference.
Having tried plenty of variations of checker file, server config.rktd file, and
even client setup (which, I expect, is irrelevant), I don't know where else to
look for the root problem. Can anyone point out possible causes I might be
missing, or fixes that might work?
I've been hesitant to file this as a bug report, figuring that there may be
something I have misunderstood in the docs...but I'm now thinking it looks like
there really is something amiss in the server. I'd like to get that conjecture
decided, of course.
By the way, is it possible to write automated tests for a checker script that
uses #lang handin-server/checker -- as opposed to testing it interactively
using the client?
Regards,
Jordan
On Nov 13, 2012, at 9:55 PM, Jordan Johnson wrote:
> Hi all,
>
> I am trying to set up the handin server -- spent some time at it last year,
> but gave up as the school year was already underway with its pressing demands
> -- and am getting this error when trying to hand in an assignment from a test
> account:
>
> ; --begin error message--
> submit error: Error in your code -- namespace-attach-module: a
> different module with the same name is already in the destination namespace
> module name: "/usr/local/racket/collects/scheme/base.rkt"
> ; --end error message--
>
> It happens even with a trivially simple checker file:
>
> ;; sample checker.rkt file:
> #lang s-exp handin-server/checker
>
> (check: :language '(special beginner)
> )
> ;; end checker.rkt
>
> I've been trying valiantly to troubleshoot on my own, but I've given more
> hours to the project than I can afford -- so, any suggestions where to look?
>
> Thanks,
> jmj
____________________
Racket Users list:
http://lists.racket-lang.org/users
