extensions: add 'basic-graphics' extension #4288

mboudr35 · 2023-07-21T09:10:08Z

This extension provides a shortcut for snaps that make use of the 'mesa-core22' snap
of graphics libraries & resources. It configures the conventional 'graphics-core22'
content plug and provides the 'graphics-launch' helper script for setting-up
the environment.

Those that make frequent use of the 'mesa-core22' snap when building snaps intended for
execution on Ubuntu Core 22 (or eventually later) running ubuntu-frame may especially
appreciate this extension, as this automates much of the boilerplate put in the snapcraft.yaml.

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Have you successfully run make lint?
Have you successfully run pytest tests/unit?

Saviq

Hey, so as discussed my initial feedback on this:

I don't think we should have setup.sh here — it's our shortcut to not having to wait for store declarations, but it shouldn't proliferate in a Snapcraft extension.

There's no IoT specificity - we'd like for any graphical snap to ultimately move to this approach - rather than shipping Mesa et al. Neither is Wayland the only target, so I wonder if we should go for a more optimistic approach, where a Wayland setup is prepared, but not a requirement.

Here's a simpler version of wayland-launch that does this: https://github.com/MirServer/graphics-test-tools/blob/main/scripts/bin/wayland-launch. It should probably be renamed graphics-launch, too - or even integrated into graphics-core22-wrapper. I would probably import the wrapper and cleanup scripts directly here, rather than dump it in build-time. Snapcraft knows how to clean up what's in the base snap, maybe it's possible to do the same for mesa-coreXX?

extensions/graphics/wayland/bin/wayland-launch

Saviq · 2023-07-26T15:23:17Z

snapcraft/extensions/graphics.py

+    """An extension that provides graphics libraries for snaps that don't need to integrate with a full desktop environment.
+
+    This extension is intended to be used with Wayland-ready application snaps that will execute on an
+    Ubuntu Core 22 (and eventually later) systems with ubuntu-frame,
+    however it is not exclusively fixated on Ubuntu Core systems - Desktop should work fine
+    (though you may want to consider one of the gnome/kde extensions instead).
+
+    This extension defines a single plug "graphics-core{base version number}" which is a content
+    interface to the "mesa-core{base version number}" snap that provides the graphics libraries and
+    other important resources.  It also configures apps to use the "opengl" and "wayland" plugs,
+    which are essential for graphical output.
+
+    To assist in the execution of Wayland applications, this extension provides a helper
+    "wayland-launch" script that can be added to the app's command-chain.
+    """


This will need a rewrite if my suggestions about making this more generic go through.

Ultimately we'd like the GNOME / KDE extensions replicate this extension's behaviour, or maybe wrap it, if that's possible.

snapcraft/extensions/graphics.py

tonyespy · 2023-08-01T19:26:43Z

There's no IoT specificity - we'd like for any graphical snap to ultimately move to this approach - rather than shipping Mesa et al. Neither is Wayland the only target, so I wonder if we should go for a more optimistic approach, where a Wayland setup is prepared, but not a requirement.

I'd really hate to see us add this using the name graphics though. We're in a situation right now where Core customers are confused about whether or not to use the gnome extension. Thankfully we're all aligned internally that this approach is not best for people building Core-based graphical IoT snaps. If we think that this extension is useful for people building non IoT graphical snaps too, then lets make sure the name better differentiates it from the existing gnome extension (e.g. gnomeless-graphics?).

mboudr35 · 2023-08-01T19:53:14Z

[...] lets make sure the name better differentiates it from the existing gnome extension (e.g. gnomeless-graphics?).

basic-graphics, primitive-graphics, mesa-graphics, mesa

Perhaps one of these could be a better fit?

Saviq · 2023-08-02T08:39:51Z

[...] lets make sure the name better differentiates it from the existing gnome extension (e.g. gnomeless-graphics?).

basic-graphics, primitive-graphics, mesa-graphics, mesa

plain-graphics, gl, accelerated-graphics, gpu?

mesa shouldn't be a part of it since it's just one implementation.

tonyespy · 2023-08-02T19:18:43Z

What about graphics-minimal (or graphics-min) and we push for re-naming the current gnome extension to graphics-gnome in the next version of snapcraft?

Saviq · 2023-08-02T19:35:54Z

What about graphics-minimal (or graphics-min) and we push for re-naming the current gnome extension to graphics-gnome in the next version of snapcraft?

That would suggest there can be a non-graphics GNOME?

tonyespy · 2023-08-02T21:16:48Z

That would suggest there can be a non-graphics GNOME?

Good point. Although that only applies to the last suggestion in my comment.

mboudr35 · 2023-08-21T17:47:21Z

@Saviq @tonyespy I've pushed some changes following previous discussion, please give a look when able!

codecov-commenter · 2023-08-23T16:15:52Z

Codecov Report

Merging #4288 (087449f) into main (c6f41da) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@            Coverage Diff             @@
##             main    #4288      +/-   ##
==========================================
+ Coverage   89.18%   89.20%   +0.02%     
==========================================
  Files         321      322       +1     
  Lines       21614    21650      +36     
==========================================
+ Hits        19276    19313      +37     
+ Misses       2338     2337       -1

Files	Coverage Δ
snapcraft/extensions/basic_graphics.py	`100.00% <100.00%> (ø)`
snapcraft/extensions/registry.py	`92.00% <100.00%> (+0.33%)`	⬆️

... and 1 file with indirect coverage changes

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Saviq

I'd like to see Snapcraft's feedback on this, as I feel this pushes things here and there :)

Some remarks inline.

extensions/basic-graphics/bin/graphics-launch

snapcraft/extensions/basic_graphics.py

Saviq · 2023-09-05T12:11:29Z

snapcraft/extensions/basic_graphics.py

+                # This should be the last part to prime, so the clean-up can execute properly
+                "after": list(self.yaml_data["parts"].keys()),


Wonder how extension ordering affects this… Maybe just naming the part zzz_ would be safer xD

That may be the case, though as I understand the naming convention for extension-provided parts the extname/ prefix is required. I've no idea if applying an ordering prefix to the portion after the / would be applied in the same way

FWIW I mean that there might be an extension processed after yours, in which case the after: will miss any parts introduced there.

It may be needed to document that this extension should be last, if that actually matters.

cmatsuoka · 2023-09-22T13:08:36Z

Thanks! I think it would be interesting for us to play a bit with it and explore some scenarios, do you have a test project I could use? Also it's important to have tests for this extension before landing, including a unit test in tests/unit/extensions and a package building test in tests/spread/extensions.

mr-cal

This looks like a useful extension but I'll echo Claudio's comment - a spread test and test project to experiment with would be helpful.

This extension provides a shortcut for snaps that make use of the 'graphics-core{ver}' interface, such as the 'mesa-core{ver}' and similar snaps, for consuming graphics libraries & resources. It configures the conventional 'graphics-core22' content plug and provides the 'graphics-launch' helper script for setting-up the environment.

Saviq · 2024-10-23T11:48:11Z

@cmatsuoka FYI

Saviq suggested changes Jul 26, 2023

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Karmavil reviewed Jul 27, 2023

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snapcraft/extensions/graphics.py Outdated Show resolved Hide resolved

mboudr35 changed the title ~~extensions: add 'graphics' extension~~ extensions: add 'basic-graphics' extension Aug 22, 2023

Saviq suggested changes Sep 5, 2023

View reviewed changes

sergiusens requested review from cmatsuoka and mr-cal September 21, 2023 18:00

mr-cal reviewed Oct 6, 2023

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mboudr35 closed this by deleting the head repository Jun 24, 2024

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extensions: add 'basic-graphics' extension #4288

extensions: add 'basic-graphics' extension #4288

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		# This should be the last part to prime, so the clean-up can execute properly
		"after": list(self.yaml_data["parts"].keys()),

extensions: add 'basic-graphics' extension #4288

extensions: add 'basic-graphics' extension #4288

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