feat(nix): flake with binary package and NixOS module - #290
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📝 WalkthroughWalkthroughThe change adds Nix packaging, a NixOS module, flake checks, CI automation for validation and release pin updates, Nix installation documentation, ignored Nix outputs, and a UI timestamp handling fix for reproducible package stores. ChangesNix integration
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant User as Nix user
participant Flake as flake.nix
participant Package as nix/package.nix
participant Module as nix/module.nix
participant Systemd as hypercolor user service
User->>Flake: run or import Hypercolor
Flake->>Package: select platform release artifact
Package-->>Flake: provide patched package
User->>Module: enable services.hypercolor
Module->>Systemd: configure hypercolor-daemon user service
Systemd->>Systemd: start with UI, effects, logging, and hardening settings
Merge Risk: 🟡 Moderate · up to Nix release updates and first-time service startup are not yet reliable, so these issues should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (8 skipped: 8 unsupported.) ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
⚔️ Resolve merge conflicts 💡
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In @.github/workflows/ci.yml:
- Line 2342: Update the release-pin pull-request flow around `gh pr create` so
it first queries for an existing open pull request and reports that only when
one is found; otherwise, propagate any `gh pr create` failure instead of
suppressing it with an unconditional fallback.
- Line 2336: Before the git push using --force-with-lease, fetch the existing
${branch} reference from origin so the local remote-tracking state provides a
lease value. Keep the current branch push behavior and force-with-lease
protection unchanged.
- Line 915: Update the checkout step using actions/checkout@v6 in the Nix job to
set persist-credentials to false, while preserving the existing checkout
behavior and other workflow configuration.
In `@docs/content/download.md`:
- Line 72: Add a declaration for the nixpkgs input, including its URL, alongside
the existing hypercolor input in the example before outputs destructures
nixpkgs. Ensure the copied flake evaluates without relying on an undeclared
input.
In `@nix/module.nix`:
- Around line 138-142: Update the hypercolor user-service configuration around
ReadWritePaths to ensure %h/.config/hypercolor, %h/.local/share/hypercolor, and
%h/.local/state/hypercolor are created before systemd performs mount-namespace
setup, using the module’s existing directory-creation mechanism or an equivalent
pre-start dependency.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr.
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.github/workflows/ci.yml.gitignoreREADME.mdcrates/hypercolor-daemon/src/daemon.rsdocs/content/download.mdflake.nixnix/module.nixnix/package.nixnix/release.json
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NixOS users could not run Hypercolor at all: the release binaries expect a conventional dynamic loader path, and both installers assume sudo-managed udev rules under /etc. The flake wraps the per-architecture Linux release tarball the same way packaging/aur does, re-linking the ELF binaries against nixpkgs with autoPatchelf, and ships a NixOS module so a single services.hypercolor.enable = true installs the package, the udev rules, the i2c-dev kernel module, and a hardened systemd user service. nix/release.json pins the version and per-architecture checksums so the flake stays usable at every commit; the release pipeline refreshes it. Libraries the daemon opens at runtime (EGL, GL, Vulkan, Wayland, xkbcommon) and the tray's appindicator land on the RUNPATH, and addDriverRunpath makes /run/opengl-driver visible for GPU compositing. A from-source derivation is deliberately out of scope: the daemon's default feature set builds Servo and SpiderMonkey, which is hours of compile behind a build script that expects network access. Verified on an aarch64 Ubuntu VM with nix 2.35: nix flake check passes, the built daemon reports healthy with all 56 bundled effects and serves the UI.
The nix job runs nix flake check plus a smoke test of the built package whenever the flake, nix/, or udev/ change, and enforces nixfmt so the files stay formatted the way nixpkgs expects. update-nix mirrors update-aur: after the stable release tarballs are published it recomputes their checksums, rewrites nix/release.json, and opens a pull request rather than pushing to main, so the pin lands through the normal review gate.
Adds a NixOS and Nix section to the download page with the nix run one-liner, a minimal flake input example, the services.hypercolor option summary (including the input.allDevices keylogging trade-off), and the non-NixOS profile install path. README points at it from the Linux install paragraph alongside the deb, AUR, and Homebrew options.
Reproducible package stores such as Nix and Guix reset every file mtime to the Unix epoch, so the stale-web-UI heuristic in resolve_ui_dir read the bundled UI as twenty thousand days old and nagged about a rebuild on every daemon start. Modification times at or before epoch plus one second now count as an unknown build time and log the ordinary "Serving web UI" line.
GitHub never runs pull_request workflows for PRs opened with GITHUB_TOKEN, so the nix job would not have checked the checksums the update-nix job writes. The job now installs nix, runs nix flake check, builds the package against the rewritten pin, and confirms the CLI reports the release version before it opens the pull request. The bot branch is pushed with a plain force: a lease against a branch the checkout never fetched rejects every rerun of the tag lane while the previous bot branch still exists, and the pull request fallback below it never gets a chance to run.
systemd does not scan ~/.nix-profile, so the non-NixOS paragraph now links the shipped user unit into ~/.config/systemd/user, reloads and enables it, and copies the udev rules into /etc/udev/rules.d, instead of stopping at "the package ships a user unit".
Nix and Guix stamp store files at one second past the Unix epoch, which is why the daemon's stale-UI filter compares strictly greater than that instant; the comment now says so before someone relaxes it to >=. The flake's module check dropped a grep branch that could never match because NixOS quotes Environment= values.
The Nix job runs PR-controlled flake output, so it no longer persists the checkout token. The release-pin job now asks whether a pull request for the bot branch is already open before creating one, instead of treating every gh pr create failure as "already exists". Both checkouts move to actions/checkout@v7 to match the rest of the workflow. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014466GJcZeEz2om6JDZ3Chm
ProtectHome=read-only with ReadWritePaths= requires every listed path to exist when systemd sets up the mount namespace. The deb and AUR installers create those directories at install time, but a NixOS module has no install step, so a fresh login would fail the unit before ExecStart. User tmpfiles rules create them at session start. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014466GJcZeEz2om6JDZ3Chm
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The example destructures nixpkgs in outputs without declaring it, so a copied flake failed evaluation with a missing-input error. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014466GJcZeEz2om6JDZ3Chm
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What this changes
NixOS users could not run Hypercolor at all: the release binaries expect a conventional dynamic loader, and both installers assume sudo-managed udev rules under
/etc. The repository is now a flake. It wraps the official per-architecture Linux release tarball the same way the AUR package does, re-links the ELF binaries against nixpkgs with autoPatchelf, and ships a NixOS module so one line of configuration installs everything:The module installs the package, the vendor udev rules, the
i2c-devkernel module for SMBus discovery, enables the XDG portal for Wayland screen capture, and defines a hardened systemd user service with the same settings as the packaged deb and AUR unit. Options coverautoStart,logLevel,extraArgs,smbus.enable, and an opt-ininput.allDeviceswhose description spells out the keylogging trade-off before anyone turns it on.Outside NixOS,
nix run github:hyperb1iss/hypercolor -- devicestries the CLI with nothing installed, andnix profile installgets the binaries plus a user unit with store paths already filled in.Why
OpenRGB ships in nixpkgs with a
services.hardware.openrgbmodule, and Hypercolor positions itself as the thing you reach for instead. The missing Nix path was a visible gap for exactly the audience most likely to notice it.A from-source derivation is deliberately out of scope. The daemon's default feature set builds Servo and SpiderMonkey, which is hours of compile behind a build script that expects network access, and the UI and effects add two more fixed-output hashes on top. Wrapping the tarball gives NixOS users a working install today; the source build can follow when someone wants that project.
🛠️ How it works
nix/release.jsonpins the version and per-architecture checksums, so the flake is usable at every commit rather than only after a release.nix/package.nixfetches that tarball, keeps theshare/hypercolorlayout the daemon already discovers relative to its executable, and puts the libraries the daemon opens at runtime (EGL, GL, Vulkan, Wayland, xkbcommon, the tray's appindicator) on the RUNPATH.addDriverRunpathmakes/run/opengl-drivervisible so the GPU compositor works on NixOS graphics stacks.CI grows two jobs. The
nixjob runsnix flake check, enforces nixfmt, builds the package, and smoke-tests the result whenever the flake,nix/, orudev/change. Theupdate-nixjob mirrorsupdate-aur: after a stable release publishes its tarballs, it recomputes the checksums, builds the flake against the new pin in the same job, and opens a pull request bumping it so main keeps its review gate. The in-job build matters because GitHub never runspull_requestworkflows for PRs opened with the workflow token, so that PR will show no checks of its own.One daemon fix rides along. Nix stamps every store mtime at one second past the Unix epoch, which made the stale-web-UI heuristic log a rebuild warning on every start with the bundled UI reported as twenty thousand days old. Epoch-normalized mtimes now count as unknown build time.
Verification
nix flake check, which builds the module's unit and asserts on its contents)just verifypasses locally (Rust fmt + lint + test) (fmt and clippy onhypercolor-daemonpass; the full workspace suite was not rerun for a one-expression change)just denypasses (not applicable)just ui-testandjust ui-buildpass (not applicable)just sdk-lint,just sdk-check, andjust sdk-buildpass (not applicable)just python-verifypasses (not applicable)just compat-checkpasses (not applicable)just docs-buildpassescd docs && zola checkpassesci.yml; nixfmt in check mode on all three nix files)just e2e-buildpasses with the normal Servo stack (not applicable)just e2e-build-cpupasses when validating the CPU smoke fallback (not applicable)just e2epasses against the Servo stack (not applicable)The x86_64 path ran in CI: the
Nix Flakejob on run 34769145478 passed nixfmt,nix flake check, the package build, and the smoke test onubuntu-latest. That run was dispatched by hand because GitHub delivered nopull_requestevent for this branch (no workflow run and no Actions check suite exists on the head commit, while other apps queued normally); the workflow file itself parses, since the dispatch was accepted.The aarch64 path ran on an Ubuntu VM with nix 2.35:
nix flake checkpasses, including the module check that evaluates a NixOS host with the module enabled and asserts the generated unit carries the store-path--ui-dirand--effects-dirflags,ProtectSystem=strict, and the configured extra args.nix build .#hypercolorresolves every library: autoPatchelf reports zero unsatisfied dependencies, and listing through each binary's patched interpreter shows nothing missing for the daemon, the CLI, or the app shell. Plainlddon the Ubuntu host reports spurious glibc misses because it uses the host loader, so do not read that as a signal./healthas healthy, listed all 56 bundled effects, and served the web UI index with a 200.update-nix, and the non-NixOS activation steps in the docs) are in the last three commits.The NixOS module was not booted on a real NixOS install; the evaluation check proves the option wiring and the unit text, not a live login session.
Notes for reviewers
The module defines its own user unit rather than reusing the packaged one, so options map cleanly onto
ExecStartand environment. It intentionally omits theMemoryMax=512MandCPUQuota=25%lines from the packaged unit; those caps apply to a render daemon and read as a nerf, so this PR does not carry them into a new surface. Say the word if you want them kept for parity.