Install buildifier via Bazel

.github/workflows/lint.yml

@@ -30,9 +30,6 @@ jobs:
           chmod +x llvm.sh
           sudo ./llvm.sh 18
           sudo apt-get install -y --no-install-recommends clang-format-18
-          # buildifier won't install properly if specifying a particular version
-          go install github.com/bazelbuild/buildtools/buildifier@latest
-          echo "BUILDIFIER=$HOME/go/bin/buildifier" >> $GITHUB_ENV
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         # The pnpm version will be determined by the `packageManager` field in `.npmrc`
@@ -44,6 +41,7 @@ jobs:
           pip install ruff
       - name: Lint
         run: |
+          ln -s $(bazel info output_base)/external external
           python3 ./tools/cross/format.py --check
         env:
           CLANG_FORMAT: clang-format-18

WORKSPACE

@@ -597,3 +597,39 @@ new_local_repository(
         visibility = ["//visibility:public"],)""",
     path = "empty",
 )
+
+# Dev tools
+http_file(
+    name = "buildifier-darwin-arm64",
+    executable = True,
+    integrity = "sha256-Wmr8asegn1RVuguJvZnVriO0F03F3J1sDtXOjKrD+BM=",
+    url = "https://github.com/bazelbuild/buildtools/releases/download/v7.3.1/buildifier-darwin-arm64",
+)
+
+http_file(
+    name = "buildifier-darwin-amd64",
+    executable = True,
+    integrity = "sha256-Wmr8asegn1RVuguJvZnVriO0F03F3J1sDtXOjKrD+BM=",
+    url = "https://github.com/bazelbuild/buildtools/releases/download/v7.3.1/buildifier-darwin-arm64",
+)
+
+http_file(
+    name = "buildifier-linux-arm64",
+    executable = True,
+    integrity = "sha256-C/hsS//69PCO7Xe95bIILkrlA5oR4uiwOYTBc8NKVhw=",
+    url = "https://github.com/bazelbuild/buildtools/releases/download/v7.3.1/buildifier-linux-arm64",
+)
+
+http_file(
+    name = "buildifier-linux-amd64",
+    executable = True,
+    integrity = "sha256-VHTMUSinToBng9VAgfWBZixL6K5lAi9VfpKB7V3IgAk=",
+    url = "https://github.com/bazelbuild/buildtools/releases/download/v7.3.1/buildifier-linux-amd64",
+)
+
+http_file(
+    name = "buildifier-windows-amd64",
+    executable = True,
+    integrity = "sha256-NwzVdgda0pkwqC9d4TLxod5AhMeEqCUUvU2oDIWs9Kg=",
+    url = "https://github.com/bazelbuild/buildtools/releases/download/v7.3.1/buildifier-windows-amd64.exe",
+)

tools/cross/format.py

@@ -2,9 +2,11 @@
 
 import logging
 import os
+import platform
 import re
 import shutil
 import subprocess
+import sys
 from argparse import ArgumentParser, Namespace
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from dataclasses import dataclass
@@ -15,7 +17,6 @@
 CLANG_FORMAT = os.environ.get("CLANG_FORMAT", "clang-format")
 PRETTIER = os.environ.get("PRETTIER", "node_modules/.bin/prettier")
 RUFF = os.environ.get("RUFF", "ruff")
-BUILDIFIER = os.environ.get("BUILDIFIER", "buildifier")
 
 
 def parse_args() -> Namespace:
@@ -100,6 +101,23 @@ def matches_any_glob(globs: tuple[str, ...], file: Path) -> bool:
     return any(file.match(glob) for glob in globs)
 
 
+def exec_target() -> str:
+    ALIASES = {"aarch64": "arm64", "x86_64": "amd64", "AMD64": "amd64"}
+
+    machine = platform.machine()
+    return f"{sys.platform}-{ALIASES.get(machine, machine)}"
+
+
+def run_bazel_tool(tool_name: str, args: list[str]) -> subprocess.CompletedProcess:
+    tool_target = f"{tool_name}-{exec_target()}"
+    tool_path = Path("external") / tool_target / "file" / "downloaded"
+
+    if not tool_path.exists():
+        subprocess.run(["bazel", "fetch", f"@{tool_target}//file"])
+
+    return subprocess.run([tool_path, *args])
+
+
 def clang_format(files: list[Path], check: bool = False) -> bool:
     cmd = [CLANG_FORMAT]
     if check:
@@ -117,8 +135,8 @@ def prettier(files: list[Path], check: bool = False) -> bool:
 
 
 def buildifier(files: list[Path], check: bool = False) -> bool:
-    cmd = [BUILDIFIER, "--mode=check" if check else "--mode=fix"]
-    result = subprocess.run(cmd + files)
+    cmd = ["--mode=check" if check else "--mode=fix"]
+    result = run_bazel_tool("buildifier", cmd + files)
     return result.returncode == 0