function unzip()

in lib/cmds/update.ts [234:275]
33 lines of code
7 McCabe index (conditional complexity)

function unzip<T extends Binary>(binary: T, outputDir: string, fileName: string): void {
  // remove the previously saved file and unzip it
  let osType = Config.osType();
  let mv = path.resolve(outputDir, binary.executableFilename());
  try {
    fs.unlinkSync(mv);
  } catch (err) {
    try {
      rimraf.sync(mv);
    } catch (err2) {
    }
  }

  // unzip the file
  logger.info(binary.name + ': unzipping ' + fileName);
  if (fileName.slice(-4) == '.zip') {
    try {
      let zip = new AdmZip(path.resolve(outputDir, fileName));
      zip.extractAllTo(outputDir, true);
    } catch (e) {
      throw new Error(`Invalid filename: ${path.resolve(outputDir, fileName)}`)
    }
  } else {
    // We will only ever get .tar files on linux
    child_process.spawnSync('tar', ['zxvf', path.resolve(outputDir, fileName), '-C', outputDir]);
  }

  // rename
  fs.renameSync(path.resolve(outputDir, binary.zipContentName()), mv);

  // set permissions
  if (osType !== 'Windows_NT') {
    logger.info(binary.name + ': setting permissions to 0755 for ' + mv);
    if (binary.id() !== AndroidSDK.id) {
      fs.chmodSync(mv, '0755');
    } else {
      fs.chmodSync(path.resolve(mv, 'tools', 'android'), '0755');
      fs.chmodSync(path.resolve(mv, 'tools', 'emulator'), '0755');
      // TODO(sjelin): get 64 bit versions working
    }
  }
}