Function sha512

src/common/command_utils.cpp:172–201

Future<string> sha512(const Path& input)
{
#ifdef __linux__
  const string cmd = "sha512sum";
  vector<string> argv = {
    cmd,
    input             // Input file to compute shasum.
  };
#else
  const string cmd = "shasum";
  vector<string> argv = {
    cmd,
    "-a", "512",      // Shasum type.
    input             // Input file to compute shasum.
  };
#endif // __linux__

  return launch(cmd, argv)
    .then([cmd](const string& output) -> Future<string> {
      vector<string> tokens = strings::tokenize(output, " ");
      if (tokens.size() < 2) {
        return Failure(
            "Failed to parse '" + output + "' from '" + cmd + "' command");
      }

      // TODO(jojy): Check the size of tokens[0].

      return tokens[0];
    });
}


Future<Nothing> gzip(const Path& input)