build: use rust stable for linting

Nightly is no longer required since latest update, so we can remove its
requirement and thus simplify the devel rather than require using both
stable and nightly compiler.
This should also reduce the target/debug size as there'll be only
builds from one compiler.

Signed-off-by: Tiago Castro <tiagolobocastro@gmail.com>

Author: tiagolobocastro

nix/shell/rust.nix

@@ -19,7 +19,7 @@ let
 
   shellEnv = {
     # Path to nightly Rust, needed for linter and style.
-    RUST_NIGHTLY_PATH = rustChannels.nightly;
+    # RUST_NIGHTLY_PATH = rustChannels.nightly;
 
     # Path to debug output dir.
     RUST_TARGET_DEBUG = "target/debug";

scripts/rust-linter-env.sh

@@ -46,10 +46,10 @@ fi
 # rustfmt and clippy "2021-11-29".
 # When upgrading Rust toolchain version, check 'cargo --version',
 # 'cargo fmt --version', 'cargo clippy --version' and put them here.
-RUST_TOOLCHAIN_VER="2024-10-30"
-WANTED_CARGO_VER="cargo 1.84.0-nightly (* 2024-10-25)"
-WANTED_RUSTFMT_VER="rustfmt 1.8.0-nightly (* 2024-10-29)"
-WANTED_CLIPPY_VER="clippy 0.1.84 (* 2024-10-29)"
+RUST_TOOLCHAIN_VER=${RUST_TOOLCHAIN_VER:-"1.82.0"}
+WANTED_CARGO_VER=${WANTED_CARGO_VER:-"cargo 1.82.0 (* 2024-08-21)"}
+WANTED_RUSTFMT_VER=${WANTED_RUSTFMT_VER:-"rustfmt 1.7.1-stable (* 2024-10-15)"}
+WANTED_CLIPPY_VER=${WANTED_CLIPPY_VER:-"clippy 0.1.82 (* 2024-10-15)"}
 CARGO="cargo"
 CARGO_MODE="system"