matrix-tuwunel: run tests in debug profile

[scvalex]

The tuwunel build is timing out intermittently on both aarch64 and x86-64.

The specific step that causes the timeout is the Compiling tuwunel v1.7.1 (/build/source/src/main) step during checkPhase. So, we're timing out building the tests and not running them.

This is caused by tuwunel having 16 integration tests. Cargo compiles each of them as a separate binary which statically links 110 MB worth of tuwunel. Linking 16 big binaries like this takes a really long time in "release" profile.

Building the tests in debug profile reduces the package build from 44min to 12min on my machine. So, let's do that.

The previous version of this PR just disabled the tests, hence the first few comments below. We don't need to do that anymore.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.
• Follows the automation/AI policy.

[PedroHLC]

Maybe all aarch64

[scvalex]

Maybe all aarch64

Good point. Done.

[scvalex]

The builds on 1.7.0 aren't timing out anymore. Let's wait an see what happens with the newly merged 1.7.1. If those don't time out either, I'll just close this PR.

[scvalex]

We're now seeing timeouts on x86-64 too, so this PR should probably disable check phase on all platforms.

I've opened an issue with upstream to see if they have any ideas because thinking some more, 2h11m for a successful build on x86-64 does seem suspiciously long.

[scvalex]

I think I understand what is happening:

• On my machine, building the nixpkgs tuwunel build takes 8m without tests and 44m with tests. The hydra machines are likely slower and busier than my workstation, so they could easily take 3x longer.
• The thing that was confusing me was that the timeout was happening while compiling the tests rather than when running them. I was looking at processes while the build was happening and it was indeed spending a huge amount of time running rustc.
• Tuwunel has 16 integration tests. The way cargo test works is that it compiles every one of the integration tests into a separate binary and each of these statically links the full 110 MB worth of tuwunel.
• By default, nixpkgs builds the tests in release mode in an attempt to not recompile the library. Linking 16 tuwunels in release mode takes a really long time.
• If I configure the tests to build in debug mode, the full nixpkgs build+test takes 12m.

So, new plan is to just set checkType = "debug" for all platforms and run tests for all platforms. I'll make the changes in this PR.

[PedroHLC]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 528878
Commit: 24bb6a0c44cd68bae9b9ea6eee309d08cbcd6e0c

---

x86_64-linux

✅ 1 package built:

• matrix-tuwunel

[PedroHLC]

I won't be ablt to test it in aarch64-linux so soon

╰─λ ./results/matrix-tuwunel-x86_64-linux/bin/tuwunel --version
tuwunel 1.7.1

╰─λ du -h (readlink ./results/matrix-tuwunel-x86_64-linux)
51M     /nix/store/4j2wncgw94ah3ixd33zg6fbpynwgllrr-matrix-tuwunel-1.7.1/bin
51M     /nix/store/4j2wncgw94ah3ixd33zg6fbpynwgllrr-matrix-tuwunel-1.7.1`

[scvalex]

Oh, right. That would be a good test.

I built on aarch64 and deployed to my server. Everything works as expected since this PR doesn't change anything about the final artifacts. It was however much faster to build: this normally takes around 4h on a tiny 2 CPU VM from Hetzner, but now it took only 70m on the same hardware.

[scvalex]

@pbsds Thank you!

[nixpkgs-ci]

Successfully created backport PR for release-26.05:

• [Backport release-26.05] matrix-tuwunel: run tests in debug profile #537165

[scvalex]

To close this off, the 1.7.1 build was successful on both aarch64 and x86-64. The former took 1h2m and the latter 47m, so we're hopefully well within the timeout threshold now.