usbkvm: init at 0.1.0

[lschuermann]

This packages the USBKVM desktop application, a GTK application to control a USB keyboard, video and mouse adapter based around the MS2109 HDMI to USB capture IC.

I initially packaged the Git source, building the device firmware as part of the Nix build process. However, this led to issues with an old version of the gcc-arm-embedded package with broken LTO, which ended up soft-bricking my device. Furthermore, the USBKVM developer (@carrotIndustries) kindly requested to package the release tarball instead of the source, as this contains a known-good device firmware version. I'm happy to add an option to build from source in addition to the tarball, if that's reasonable for Nixpkgs.

This was packaged based on initial work done by @rubenhoenle. I can add them as a co-maintainer if they'd like.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[lschuermann]

error: access to URI 'https://github.com/carrotIndustries/usbkvm/releases/download/v0.1.0/usbkvm-v0.1.0.tar.gz' is forbidden in restricted mode

Don't quite know why the CI is failing. I thought that GitHub URLs were allowed in the restricted eval mode, but also haven't contributed much in a while. There's plenty of other packages that use builtins.fetchurl with a GitHub release URL. Do you need to be a trusted user to allow this source to be fetched?

[lschuermann]

I didn't know that fetchers need to be fixed-output derivations in Nixpkgs. Thanks to @Lassulus for the hint!