turnout 0.2.0

A developer's switchyard: point local apps at any backend stand, keep servers and secrets at hand, build and deploy from any directory
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// Downloads the turnout binary matching this package version from GitHub Releases.
const fs = require("fs");
const https = require("https");
const path = require("path");
const { spawnSync } = require("child_process");

const pkg = require("./package.json");
const REPO = "lacodda/turnout";
// The wrapper can be patched independently of the Rust binary: an explicit
// turnout.binary field pins the release tag, otherwise it follows the version.
const TAG = (pkg.turnout && pkg.turnout.binary) || `v${pkg.version}`;

const TARGETS = {
  "win32-x64": ["x86_64-pc-windows-msvc", "zip"],
  "linux-x64": ["x86_64-unknown-linux-gnu", "tar.gz"],
  "darwin-arm64": ["aarch64-apple-darwin", "tar.gz"],
};

const key = `${process.platform}-${process.arch}`;
const entry = TARGETS[key];
if (!entry) {
  console.error(`turnout-cli: no prebuilt binary for ${key}; install with: cargo install turnout`);
  process.exit(1);
}
const [target, ext] = entry;
const name = `turnout-${TAG}-${target}`;
const url = `https://github.com/${REPO}/releases/download/${TAG}/${name}.${ext}`;
const exe = process.platform === "win32" ? "turnout.exe" : "turnout";
const archive = path.join(__dirname, `archive.${ext}`);

function download(url, file, redirects, done) {
  if (redirects > 5) return done(new Error("too many redirects"));
  https
    .get(url, { headers: { "user-agent": "turnout-cli" } }, (res) => {
      if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
        res.resume();
        return download(res.headers.location, file, redirects + 1, done);
      }
      if (res.statusCode !== 200) {
        res.resume();
        return done(new Error(`HTTP ${res.statusCode} for ${url}`));
      }
      const out = fs.createWriteStream(file);
      res.pipe(out);
      out.on("finish", () => out.close(done));
      out.on("error", done);
    })
    .on("error", done);
}

console.log(`turnout-cli: downloading ${url}`);
download(url, archive, 0, (err) => {
  if (err) {
    console.error(`turnout-cli: download failed: ${err.message}`);
    process.exit(1);
  }
  // Extraction must not depend on which tar happens to be first in PATH
  // (Git Bash ships a GNU tar that cannot read zip): zip goes through
  // PowerShell's Expand-Archive, tar.gz through tar on Unix systems.
  const result =
    ext === "zip"
      ? spawnSync(
          "powershell.exe",
          ["-NoProfile", "-NonInteractive", "-Command", "Expand-Archive -LiteralPath 'archive.zip' -DestinationPath . -Force"],
          { cwd: __dirname, stdio: "inherit" },
        )
      : spawnSync("tar", ["-xzf", `archive.${ext}`], { cwd: __dirname, stdio: "inherit" });
  if (result.status !== 0) {
    console.error("turnout-cli: cannot extract the archive");
    process.exit(1);
  }
  fs.renameSync(path.join(__dirname, name, exe), path.join(__dirname, exe));
  fs.rmSync(path.join(__dirname, name), { recursive: true, force: true });
  fs.rmSync(archive, { force: true });
  if (process.platform !== "win32") {
    fs.chmodSync(path.join(__dirname, exe), 0o755);
  }
  console.log(`turnout-cli: installed turnout ${TAG}`);
});