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. rust-src and the
x86_64-pc-windows-gnu target are added for win-cross-build.sh, which needs
`-Z build-std=std,panic_abort`; that script still expects the peerspeak-win
distrobox for the mingw half.
Verified on 1.97.1: 640 lib tests pass, fmt clean.
NOT fixed here, and pre-existing rather than a migration artifact:
`cargo clippy --all-targets -- -D warnings` fails with 15 warnings — 13
`float_literal_f32_fallback` (bare 0.05/0.01 into `.step()`, wants `0.05_f32`),
one `manual implementation of Option::filter`, one `redundant reference in
format!`, all in src/app/mod.rs. The f32 lint is `future_incompatible` and is
slated to become a hard error, so it needs fixing regardless of platform.
CachyOS was already on 1.97.1 well before the 2026-07-31 S2 merge logged as
"clippy clean", so that claim reflects a plain `cargo clippy` run, which exits
0 on warnings. `cargo clippy --fix` applies all 15 automatically.
The repo assumed a distro with a system-wide Rust, which NixOS does not
provide. This adds a flake devShell carrying the full dependency surface:
- Build: rustc/cargo/clippy/rustfmt, pkg-config, clang (pipewire-sys and
libspa-sys need a real libclang for bindgen, via LIBCLANG_PATH), cmake
(audiopus_sys's vendored-libopus fallback), and git (build.rs stamps
PEERSPEAK_GIT_SHORT from `git rev-parse`).
- Link: alsa-lib, libopus, pipewire.
- dlopen'd at runtime: vulkan-loader, libxkbcommon, wayland and the X11 libs.
Nothing links these, so they never land in the binary's rpath and are
reachable only through LD_LIBRARY_PATH. Omitting them builds fine and then
fails at window creation, which is a confusing way to find out.
- The supply-chain gates CI runs (cargo-deny, cargo-audit) plus cargo-deb.
These were `cargo install`ed on the CachyOS side, which does not carry
over — those binaries link that distro's glibc.
It also carries the screen-share tools (GStreamer + plugin search path,
pactl, mpv). Those look like they belong only to pixelpass, but
tests/screenshare_host_fault.rs starts a REAL pixelpass host, which aborts at
its own preflight without them — so they are a dependency of this test suite.
They are duplicated from pixelpass's flake rather than imported: the two
projects are mutually optional by design, and having one flake consume the
other would reintroduce the build-level dependency that rule prevents.
nixpkgs is pinned to nixos-26.05, the same channel the hosts run, so the
libraries here match the running PipeWire daemon and Vulkan ICD.
Verified: 640 lib tests pass, all 4 screenshare_host_fault live gates pass
(real audio backend, real network bind, real pixelpass child), fmt clean.
Known delta: clippy 1.95.0 (nixpkgs 26.05) flags one collapsible_match in
src/widget/selectable_text.rs that clippy 1.97.1 on CachyOS did not.
mollusk