nixpkgs 26.05 ships rustc 1.95.0, but this crate was developed and verified on
1.97.1 (what CachyOS had, installed 2026-07-17). Taking the compiler from
oxalica/rust-overlay decouples "which Rust the project targets" from "which
release the audio stack came from", so a nixpkgs bump can no longer move the
compiler under the lint gate as a side effect.
Chosen over rustup, which would also have worked here (nix-ld is enabled, so
its prebuilt binaries run) and would have let one rust-toolchain.toml cover the
packaging distroboxes too. The deciding factor is purity: rustup records
nothing in flake.lock, so a fresh clone or darp5 would resolve whatever it
fetched that day. rust-overlay gives the same exact-version control with the
choice pinned in the lock.
`.default` is the rustup "default" profile — rustc, cargo, rust-std, rustfmt
and clippy — so those are no longer listed individually. No windows-gnu target
here: pixelpass is Linux-only, unlike peerspeak.
Verified on 1.97.1: 256 tests pass, fmt clean, and `cargo clippy --all-targets
-- -D warnings` is clean.
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).
mollusk