Re: [racket-users] Gtk initialization failed for display ":0"

['Wayne Harris' via Racket Users]

Matthew Flatt  writes:

> At Sat, 11 Jul 2020 10:36:33 -0600, Matthew Flatt wrote:
>> Following up on Sam's suggestion, I recommend `xfvb-run` as something
>> like
>>
>>  xfvb-run racket -l handin-server
>
> Should be `xvfb-run`. I always have trouble getting those letters in
> the right order.

We'll post on [f]ace[b]ook all your spelling mistakes!  (You'll be
horrified!)

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Re: [racket-users] Gtk initialization failed for display ":0"

[Matthew Flatt]

At Sat, 11 Jul 2020 10:36:33 -0600, Matthew Flatt wrote:
> Following up on Sam's suggestion, I recommend `xfvb-run` as something
> like
> 
>  xfvb-run racket -l handin-server

Should be `xvfb-run`. I always have trouble getting those letters in
the right order.

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Re: [racket-users] Gtk initialization failed for display ":0"

[Matthew Flatt]

At Sat, 11 Jul 2020 09:26:47 -0700 (PDT), Shriram Krishnamurthi wrote:
> I'm running headless Racket from a Docker container for auto-grading 
> assignments in Gradescope.
> 
> The students are writing BSL programs with 2htdp/image. This does not cause 
> any problems for most of them.
> 
> Two students, however, get an error in file loading with the error message 
> in the subject line («Gtk initialization failed for display ":0"»).
> 
> I finally localized the problem: it's because they are using the universe 
> Teachpack.
> 
> I don't know what in universe is causing this, but it seems rather weird 
> that *image*, which is fundamentally graphical, does not cause this problem 
> but *universe*, which is it fundamentally not, does.

It's helpful help to distinguish between "images" and "GUIs". The
`2htdp/image` library is only about drawing images, so it doesn't need
a GUI context. The `2htdp/universe` library deals with windows and
mouse clicks, so it needs a GUI context.

> Furthermore, this dependency means that any program that depends on 
> universe would likely not be able to be auto-graded (at least in a 
> Gradescope-like headless context), which seems a rather severe restriction. 
> (And ironic, given that the design of universe is to enable testing, and 
> hence also auto-grading.) I don't know how Northeastern does auto-grading 
> of universe that gets around this, but it's clearly in a different setting.

Following up on Sam's suggestion, I recommend `xfvb-run` as something
like

 xfvb-run racket -l handin-server


Matthew

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Re: [racket-users] Gtk initialization failed for display ":0"

[Sam Tobin-Hochstadt]

The usual solution to this problem is to use xvfb to create a virtual
display, which works great in this situation when the display is not really
needed anyway. This is how we run the handin server headless and how all
the racket CI works.

Sam

On Sat, Jul 11, 2020, 12:26 PM Shriram Krishnamurthi 
wrote:

> I'm running headless Racket from a Docker container for auto-grading
> assignments in Gradescope.
>
> The students are writing BSL programs with 2htdp/image. This does not
> cause any problems for most of them.
>
> Two students, however, get an error in file loading with the error message
> in the subject line («Gtk initialization failed for display ":0"»).
>
> I finally localized the problem: it's because they are using the universe
> Teachpack.
>
> I don't know what in universe is causing this, but it seems rather weird
> that *image*, which is fundamentally graphical, does not cause this
> problem but *universe*, which is it fundamentally not, does.
>
> Furthermore, this dependency means that any program that depends on
> universe would likely not be able to be auto-graded (at least in a
> Gradescope-like headless context), which seems a rather severe restriction.
> (And ironic, given that the design of universe is to enable testing, and
> hence also auto-grading.) I don't know how Northeastern does auto-grading
> of universe that gets around this, but it's clearly in a different setting.
>
> I don't have a "question" because I seem to have identified the base issue
> here. This is mostly here for future reference, since I saw some posts from
> looking for that string that didn't answer my need (but were still useful
> in indicating it might be a dependency), so I'm leaving this here for a
> future person who might be searching.
>
> However, it would also be nice if the universe Teachpack could avoid this
> dependency entirely or refactor it into parts that do and don't need it.
>
> Shriram
>
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> 
> .
>

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[racket-users] Gtk initialization failed for display ":0"

[Shriram Krishnamurthi]

I'm running headless Racket from a Docker container for auto-grading 
assignments in Gradescope.

The students are writing BSL programs with 2htdp/image. This does not cause 
any problems for most of them.

Two students, however, get an error in file loading with the error message 
in the subject line («Gtk initialization failed for display ":0"»).

I finally localized the problem: it's because they are using the universe 
Teachpack.

I don't know what in universe is causing this, but it seems rather weird 
that *image*, which is fundamentally graphical, does not cause this problem 
but *universe*, which is it fundamentally not, does.

Furthermore, this dependency means that any program that depends on 
universe would likely not be able to be auto-graded (at least in a 
Gradescope-like headless context), which seems a rather severe restriction. 
(And ironic, given that the design of universe is to enable testing, and 
hence also auto-grading.) I don't know how Northeastern does auto-grading 
of universe that gets around this, but it's clearly in a different setting.

I don't have a "question" because I seem to have identified the base issue 
here. This is mostly here for future reference, since I saw some posts from 
looking for that string that didn't answer my need (but were still useful 
in indicating it might be a dependency), so I'm leaving this here for a 
future person who might be searching.

However, it would also be nice if the universe Teachpack could avoid this 
dependency entirely or refactor it into parts that do and don't need it.

Shriram

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