Function downloadFd

apps/kimi-code/src/utils/process/fd-detect.ts:103–139

()

}

async function downloadFd(): Promise<string | null> {
  const assetName = getFdAssetName();
  if (assetName === null) return null;
  const expectedSha256 = FD_ARCHIVE_SHA256[assetName];
  if (expectedSha256 === undefined) return null;

  const binDir = getBinDir();
  mkdirSync(binDir, { recursive: true });

  const binaryPath = getManagedFdBinaryPath();
  const extractDir = join(
    binDir,
    `fd_extract_${process.pid}_${Date.now()}_${Math.random().toString(36).slice(2, 10)}`,
  );
  mkdirSync(extractDir, { recursive: true });
  const archivePath = join(extractDir, assetName);

  try {
    const downloadUrl = `${FD_BASE_URL}/${assetName}`;
    await downloadFile(downloadUrl, archivePath);
    verifyArchive(archivePath, expectedSha256);
    extractArchive(archivePath, extractDir, assetName);

    const binaryName = platform() === 'win32' ? 'fd.exe' : 'fd';
    const extractedBinary = findBinaryRecursively(extractDir, binaryName);
    if (extractedBinary === null) return null;

    rmSync(binaryPath, { force: true });
    renameSync(extractedBinary, binaryPath);
    if (platform() !== 'win32') {
      chmodSync(binaryPath, 0o755);
    }
    return binaryPath;
  } finally {
    rmSync(extractDir, { recursive: true, force: true });
  }
}

function verifyArchive(path: string, expectedSha256: string): void {
  const actualSha256 = createHash('sha256').update(readFileSync(path)).digest('hex');