: `read' access denied for

Questions & Answers
1

Hi! Newish to Racket and I hope this is appropriate. I am going thought the material in Berkeley's CS61A and I am running into the following error when I run their autograder locally as in
racket -tm grader.rkt -- hw1-tests.rkt hw1.rkt

An error occurred:
file-or-directory-modify-seconds: `read' access denied for /Users/bernardino/Library/Preferences/org.racket-lang.prefs.rktd

I looked around and did find some Github issue but it wasn't helpful. I could just extract all their tests but I would like to understand what's off.

Any pointers?
Thank you

1 Like
2

I'm not sure how or why this happened, but I would check the permissions on ~/Library/Preferences/org.racket-lang.prefs.rktd and try to adjust them with chmod.

If that doesn't work, maybe removing that file will cause it to be re-created? Or re-installing Racket?

3

If Ben's advice doesn't work, we'll need to know your OS and how you installed Racket.

4

I'm not sure if this is relevant, but are you trying to run the grader while DrRacket is open?

5

Thanks everyone for the support and apologies for the late feedback... I tried changing permissions and even running as sudo. Nothing. Then deleted the incriminated file and finally reinstalled everything. Still getting that error.
@soegaard I'm running MacOS Ventura13.0 on an Apple M1 Silicon MacBook Air. Racket was installed with the provided installer from the racket-lang site for the Silicon architecture ....

At this stage I am just being stubborn I guess, it's not a huge deal.

6

In that case I suspect the fault is in the grader.

Is it this one?

Homework 0.1 - CS 61AS Textbook

If so, just run the test manually:

https://inst.eecs.berkeley.edu//~cs61as/autograder/tests/hw0-1-tests.rkt

E.g. for this test:

  (define/test
    sum-of-squares-tests
    (check-equal? (sum-of-squares 3 4) 25)
    (check-equal? (sum-of-squares -1 -2) 5)
    (check-equal? (sum-of-squares 1 2) 5))

try the expressions (sum-of-squares 3 4), (sum-of-squares -1 -2) etc in the repl
and see if you get the right result.

7

A possibility, related to @soegaard 's diagnosis,a is that the solution you're trying to run through the autograder is using a library that the homework's authors did not intend (e.g., the framework) and that library is, behind the scenes, trying to use the preferences file.

8

The grader is here:

https://inst.eecs.berkeley.edu//~cs61as/autograder/grader.rkt

And the evaluator has this:

#:allow-for-require (list '(planet dyoo/simply-scheme)
			       'rackunit
			       'rackunit/text-ui
			       submission-file)))

So it looks like, the grader want's you to use simply-scheme?

1 Like
9

@soegaard (and everyone) thanks

it looks like, the grader want's you to use simply-scheme?

How do I do that?

10

Yes, I am already running the tests manually (as I mentioned in the first post) but like I said I'd be interested in just solving what's wrong for the sake of it

11

Looking more closely at the Berkeley page, I see there is a template for the first homework.

It just starts with #lang racket so I don't think they are using Simply Scheme at all.
So I think it is safe to forget about Simply Scheme.

https://inst.eecs.berkeley.edu//~cs61as/templates/hw0-1.rkt

12

Yeah I was wondering about that ....
This is what I found but let's say it's not exactly clear to me...

13

Does your code use the 2htdp/image library?

14

Also, reading over that issue, it looks like you might simply need to add (require racket/gui/base) to the grading script (outside the sandbox, so not in your sample solution).

1 Like
15

Just my two cents after facing the same issue (but for hw2.rkt of the same course) - what I had to do to make the tests run was change the sandbox-path-permissions in the grader.rkt from
[sandbox-path-permissions (list '(exists "/"))]
to
[sandbox-path-permissions (list '(execute "/"))]
after looking at this part of the documentation.
Still don't understand the why, but I hope this will help anyone facing the same issue.

UPDATE: Actually, now that I thought this through, the less permissive
[sandbox-path-permissions (list '(read "/"))]
can be used, with the same success.

2 Likes
16

Only saw this now! Thanks, it worked.