login_manager/vpd_process_impl.cc

// Copyright 2016 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "login_manager/vpd_process_impl.h"

#include <string>
#include <vector>

#include <base/callback_helpers.h>
#include <base/strings/string_util.h>
#include <base/sys_info.h>
#include <chromeos/dbus/service_constants.h>

#include "login_manager/dbus_util.h"
#include "metrics/metrics_library.h"

namespace {

constexpr char kVpdUpdateMetric[] = "Enterprise.VpdUpdateStatus";

// Convenience function to get the board name and remove "-signed.." if present.
// The output is converted to lower-case. Returns "unknown" if
// CHROMEOS_RELEASE_BOARD is not set.
// TODO(igorcov): Remove this when similar function appears in libchrome.
std::string GetStrippedReleaseBoard() {
  std::string board = base::SysInfo::GetLsbReleaseBoard();
  const size_t index = board.find("-signed-");
  if (index != std::string::npos) {
    board.resize(index);
  }

  return base::ToLowerASCII(board);
}

}  // namespace

namespace login_manager {

VpdProcessImpl::VpdProcessImpl(SystemUtils* system_utils)
    : system_utils_(system_utils) {
  DCHECK(system_utils_);
}

bool VpdProcessImpl::RunInBackground(
    const std::vector<std::string>& flags,
    const std::vector<int>& values,
    bool is_enrolled,
    const PolicyService::Completion& completion) {
  DCHECK(flags.size() == values.size());
  subprocess_.reset(new ChildJobInterface::Subprocess(0, system_utils_));

  is_enrolled_ = is_enrolled;
  std::vector<std::string> argv;
  argv.push_back("/usr/sbin/set_binary_flag_vpd");
  for (size_t i = 0; i < flags.size(); i++) {
    argv.push_back(flags[i]);
    argv.push_back(std::to_string(values[i]));
  }

  if (!subprocess_->ForkAndExec(argv, std::vector<std::string>())) {
    // The caller remains responsible for running |completion|.
    return false;
  }

  // |completion_| will be run when the job exits.
  completion_ = completion;
  return true;
}

bool VpdProcessImpl::IsManagedJob(pid_t pid) {
  return subprocess_ && subprocess_->pid() > 0 && subprocess_->pid() == pid;
}

void VpdProcessImpl::RequestJobExit() {
  if (subprocess_ && subprocess_->pid() > 0)
    subprocess_->Kill(SIGTERM);
}

void VpdProcessImpl::EnsureJobExit(base::TimeDelta timeout) {
  if (subprocess_) {
    if (subprocess_->pid() < 0)
      return;
    if (!system_utils_->ProcessGroupIsGone(subprocess_->pid(), timeout)) {
      subprocess_->KillEverything(SIGABRT);
      DLOG(INFO) << "Child process was killed.";
    }
  }
}

void VpdProcessImpl::HandleExit(const siginfo_t& info) {
  MetricsLibrary metrics;
  metrics.Init();
  metrics.SendSparseToUMA(kVpdUpdateMetric, info.si_status);

  const bool success = (info.si_status == 0);
  LOG_IF(ERROR, !success) << "Failed to update VPD, code = " << info.si_status;

  if (completion_.is_null())
    return;

  // Reset the completion to ensure we won't call it again.
  auto completion = base::ResetAndReturn(&completion_);

  // We have to notify Chrome that the process has finished. Ignore the VPD
  // update error if the device is not enrolled.
  if (success || !is_enrolled_) {
    completion.Run(brillo::ErrorPtr());
    return;
  }

  // TODO(igorcov): Remove the exception when crbug.com/653814 is fixed.
  const std::string board_name = GetStrippedReleaseBoard();
  if (board_name == "parrot" || board_name == "glimmer") {
    LOG(ERROR) << "Failed to update VPD, but error ignored for device: "
               << board_name;
    completion.Run(brillo::ErrorPtr());
    return;
  }

  LOG(ERROR) << "The device failed to update VPD: "
             << board_name
             << ", full board name: "
             << base::SysInfo::GetLsbReleaseBoard();
  completion.Run(CreateError(
      dbus_error::kVpdUpdateFailed, "Failed to update VPD"));
}

}  // namespace login_manager