Function block_device_run_smartctl

src/common/blkdev.cc:617–665

}

static int block_device_run_smartctl(const string& devname, int timeout,
				     std::string *result)
{
  string device = "/dev/" + devname;

  // when using --json, smartctl will report its errors in JSON format to stdout 
  SubProcessTimed smartctl(
    "sudo", SubProcess::CLOSE, SubProcess::PIPE, SubProcess::CLOSE,
    timeout);
  smartctl.add_cmd_args(
    "smartctl",
    //"-a",    // all SMART info
    "-x",    // all SMART and non-SMART info
    "--json=o",
    device.c_str(),
    NULL);

  int ret = smartctl.spawn();
  if (ret != 0) {
    *result = std::string("error spawning smartctl: ") + smartctl.err();
    return ret;
  }

  bufferlist output;
  ret = output.read_fd(smartctl.get_stdout(), 100*1024);
  if (ret < 0) {
    *result = std::string("failed read smartctl output: ") + cpp_strerror(-ret);
  } else {
    ret = 0;
    *result = output.to_str();
  }

  int joinerr = smartctl.join();
  // Bit 0: Command line did not parse.
  // Bit 1: Device open failed, device did not return an IDENTIFY DEVICE structure, or device is in a low-power mode (see '-n' option above).
  // Bit 2: Some SMART or other ATA command to the disk failed, or there was a checksum error in a SMART data structure (see '-b' option above).
  // Bit 3: SMART status check returned "DISK FAILING".
  // Bit 4: We found prefail Attributes <= threshold.
  // Bit 5: SMART status check returned "DISK OK" but we found that some (usage or prefail) Attributes have been <= threshold at some time in the past.
  // Bit 6: The device error log contains records of errors.
  // Bit 7: The device self-test log contains records of errors.  [ATA only] Failed self-tests outdated by a newer successful extended self-test are ignored.
  if (joinerr & 3) {
    *result = "smartctl returned an error ("s + stringify(joinerr) +
      "): stderr:\n"s + smartctl.err() + "\nstdout:\n"s + *result;
    return -EINVAL;
  }

  return ret;
}

static std::string escape_quotes(const std::string& s)
{