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mollusk 9ad55c19de build(nix): add a devShell so pixelpass builds on NixOS
The repo assumed a distro with a system-wide Rust and system-wide GStreamer,
which is exactly what NixOS does not provide. This adds a flake devShell
carrying the whole dependency surface:

- Build: rustc/cargo/clippy/rustfmt, pkg-config, and clang — pipewire-sys,
  libspa-sys and libpulse-sys all generate bindings with bindgen, which needs
  a real libclang via LIBCLANG_PATH rather than just clang on PATH.
- Link: pipewire, libpulseaudio, and libxcb. The libxcb one is not obvious:
  x11rb is declared `default-features = false` here, but Cargo unifies
  features across the graph and arboard pulls x11rb with `libxcb` on, so the
  final link really does need -lxcb.
- Runtime: GStreamer is driven as a SUBPROCESS, not linked, so the tools and
  their plugin search path are provided here too. NixOS keeps every plugin in
  its own store path, so gst-launch-1.0 finds them only through
  GST_PLUGIN_SYSTEM_PATH_1_0 — without it the `gst-inspect-1.0 --exists
  pipewiresrc` preflight fails even with the plugins installed.

nixpkgs is pinned to nixos-26.05, the same channel the hosts run, so the
client libraries match the PipeWire daemon and PulseAudio server they talk to.

Verified: 256 tests pass, clippy clean, and `--doctor` reports all checks
passing (capture, encode, mux/audio, viewer, relay).
2026-08-07 13:46:05 -04:00

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/target
# Nix: the symlink `nix build` drops, and direnv's local cache. flake.nix and
# flake.lock ARE tracked — the lock is what pins the toolchain.
/result
/result-*
/.direnv/