chore: import upstream snapshot with attribution

tools/pre_commit/rust-check.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Wrapper for the rust-* pre-commit hooks.
+#
+# Skips (with a warning) when `cargo` or the requested cargo subcommand is
+# not installed, so contributors who don't touch the Rust code aren't forced
+# to install the Rust toolchain (or niche cargo extensions like cargo-sort
+# / cargo-autoinherit). Buildkite CI covers the rust hooks regardless.
+#
+# Usage: tools/pre_commit/rust-check.sh <cargo-subcommand> [extra cargo args...]
+
+set -euo pipefail
+
+# Pre-commit captures stdout/stderr and only replays on failure. Try to write
+# to /dev/tty so the warning is visible during a normal `git commit` even
+# though we exit 0; fall back to stderr where there's no controlling tty
+# (e.g. CI).
+#
+# The leading newline pushes the warning off pre-commit's dot-leader line so
+# the message doesn't mash into "Rust - ... ........WARNING:". The hook's
+# "Passed" still lands on its own line just below the warning.
+warn() {
+    { printf '\n%s\n' "$*" >/dev/tty; } 2>/dev/null || printf '\n%s\n' "$*" >&2
+}
+
+subcommand="$1"
+shift
+
+if ! command -v cargo >/dev/null 2>&1; then
+    warn "WARNING: 'cargo' not found in PATH; skipping rust pre-commit hook (cargo ${subcommand}).
+         Install the Rust toolchain via https://rustup.rs/ if you need to run rust hooks locally."
+    exit 0
+fi
+
+# Cargo subcommands resolve to a `cargo-<name>` binary on PATH. Check up-front
+# so a missing helper produces a friendly skip instead of a cargo error.
+if ! command -v "cargo-${subcommand}" >/dev/null 2>&1; then
+    case "${subcommand}" in
+        fmt) install_hint="rustup component add rustfmt" ;;
+        *)   install_hint="cargo install cargo-${subcommand}" ;;
+    esac
+    warn "WARNING: 'cargo ${subcommand}' is not installed; skipping rust pre-commit hook.
+         Install it with: ${install_hint}"
+    exit 0
+fi
+
+cd "$(git rev-parse --show-toplevel)/rust"
+exec cargo "${subcommand}" "$@"