// Copyright (c) 2012 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 <fcntl.h>      // for open
#include <sys/mount.h>  // for MS_SLAVE

#include <string>
#include <utility>

#include <base/bind.h>
#include <base/callback.h>
#include <base/callback_helpers.h>
#include <base/check.h>
#include <base/check_op.h>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/files/file_descriptor_watcher_posix.h>
#include <base/strings/stringprintf.h>
#include <base/task/single_thread_task_executor.h>
#include <base/time/time.h>
#include <base/optional.h>
#include <brillo/flag_helper.h>
#include <brillo/syslog_logging.h>
#include <libminijail.h>
#include <metrics/metrics_library.h>

#include "crash-reporter/arc_java_collector.h"
#include "crash-reporter/arc_util.h"
#include "crash-reporter/arcpp_cxx_collector.h"
#include "crash-reporter/arcvm_cxx_collector.h"
#include "crash-reporter/arcvm_kernel_collector.h"
#include "crash-reporter/bert_collector.h"
#include "crash-reporter/chrome_collector.h"
#include "crash-reporter/clobber_state_collector.h"
#include "crash-reporter/constants.h"
#include "crash-reporter/crash_reporter_failure_collector.h"
#include "crash-reporter/ec_collector.h"
#include "crash-reporter/ephemeral_crash_collector.h"
#include "crash-reporter/generic_failure_collector.h"
#include "crash-reporter/kernel_collector.h"
#include "crash-reporter/kernel_warning_collector.h"
#include "crash-reporter/missed_crash_collector.h"
#include "crash-reporter/mount_failure_collector.h"
#include "crash-reporter/paths.h"
#include "crash-reporter/security_anomaly_collector.h"
#include "crash-reporter/selinux_violation_collector.h"
#include "crash-reporter/udev_collector.h"
#include "crash-reporter/unclean_shutdown_collector.h"
#include "crash-reporter/user_collector.h"
#include "crash-reporter/util.h"
#include "crash-reporter/vm_collector.h"

using base::FilePath;
using base::StringPrintf;

namespace {

const char kKernelCrashDetected[] =
    "/run/metrics/external/crash-reporter/kernel-crash-detected";
const char kUncleanShutdownDetected[] =
    "/run/metrics/external/crash-reporter/unclean-shutdown-detected";
const char kBootCollectorDone[] = "/run/crash_reporter/boot-collector-done";

// Used for consent verification.
// TODO(mutexlox): Declare this in main and plumb it through via parameters.
MetricsLibrary s_metrics_lib;

bool TouchFile(const FilePath& file_path) {
  return base::WriteFile(file_path, "", 0) == 0;
}

bool SetUpLockFile() {
  base::FilePath lock_file = paths::Get(paths::kCrashSenderLockFile);
  if (!TouchFile(lock_file)) {
    LOG(ERROR) << "Could not touch lock file: " << lock_file.value();
    return false;
  }

  // Allow crash-access group to read and write crash lock file.
  return util::SetGroupAndPermissions(lock_file, constants::kCrashGroupName,
                                      /*execute=*/false);
}

// Set up necessary crash reporter state.
// This function will change ownership and permissions on many files (to allow
// `crash` to read/write them) so it MUST run as root.
// Return true on success.
bool InitializeSystem(std::shared_ptr<UserCollector> user_collector,
                      bool early) {
  // Try to create the lock file for crash_sender. Creating this early ensures
  // that no one else can make a directory or such with this name. If the lock
  // file isn't a normal file, crash_sender will never work correctly.
  if (!SetUpLockFile()) {
    LOG(ERROR) << "Couldn't set up lock file";
    return false;
  }

  // Set up all the common crash state directories first.  If we can't guarantee
  // these basic paths, just give up & don't turn on anything else.
  if (!CrashCollector::InitializeSystemCrashDirectories(early)) {
    return false;
  }

  // Set up metrics flag directory. Returns with non-zero if we cannot create
  // it.
  if (!CrashCollector::InitializeSystemMetricsDirectories()) {
    return false;
  }

  return user_collector->Enable(early);
}

int BootCollect(
    bool always_allow_feedback,
    std::shared_ptr<KernelCollector> kernel_collector,
    std::shared_ptr<ECCollector> ec_collector,
    std::shared_ptr<BERTCollector> bert_collector,
    std::shared_ptr<UncleanShutdownCollector> unclean_shutdown_collector,
    std::shared_ptr<EphemeralCrashCollector> ephemeral_crash_collector) {
  bool was_kernel_crash = false;
  bool was_unclean_shutdown = false;
  LOG(INFO) << "Running boot collector";

  if (always_allow_feedback || util::IsFeedbackAllowed(&s_metrics_lib)) {
    /* TODO(drinkcat): Distinguish between EC crash and unclean shutdown. */
    ec_collector->Collect();

    // Invoke to collect firmware bert dump.
    bert_collector->Collect();

    kernel_collector->Enable();
    if (kernel_collector->is_enabled()) {
      was_kernel_crash = kernel_collector->Collect();
    }
    was_unclean_shutdown = unclean_shutdown_collector->Collect();

    // Touch a file to notify the metrics daemon that a kernel
    // crash has been detected so that it can log the time since
    // the last kernel crash.
    if (was_kernel_crash) {
      TouchFile(FilePath(kKernelCrashDetected));
    } else if (was_unclean_shutdown) {
      // We only count an unclean shutdown if it did not come with
      // an associated kernel crash.
      TouchFile(FilePath(kUncleanShutdownDetected));
    }
    ephemeral_crash_collector->Collect();
  } else if (ephemeral_crash_collector->SkipConsent()) {
    ephemeral_crash_collector->Collect();
  }

  // The below calls happen independently of metrics consent, as they do not
  // generate any crash reports.

  // Must enable the unclean shutdown collector *after* collecting.
  unclean_shutdown_collector->Enable();

  // Copy lsb-release and os-release into system crash spool.  Done after
  // collecting so that boot-time collected crashes will be associated with the
  // previous boot.
  unclean_shutdown_collector->SaveVersionData();

  // Presence of this files unblocks powerd from performing lid-closed action
  // (crbug.com/988831).
  TouchFile(FilePath(kBootCollectorDone));

  return 0;
}

// Ensure stdout, stdin, and stderr are open file descriptors.  If
// they are not, any code which writes to stderr/stdout may write out
// to files opened during execution.  In particular, when
// crash_reporter is run by the kernel coredump pipe handler (via
// kthread_create/kernel_execve), it will not have file table entries
// 1 and 2 (stdout and stderr) populated.  We populate them here.
void OpenStandardFileDescriptors() {
  int new_fd = -1;
  // We open /dev/null to fill in any of the standard [0, 2] file
  // descriptors.  We leave these open for the duration of the
  // process.  This works because open returns the lowest numbered
  // invalid fd.
  do {
    new_fd = open("/dev/null", 0);
    CHECK_GE(new_fd, 0) << "Unable to open /dev/null";
  } while (new_fd >= 0 && new_fd <= 2);
  close(new_fd);
}

// Reduce privs that we don't need.  But we still need:
// - The top most /proc to pull details out of it.
// - Read access to the crashing process's memory (regardless of user).
// - Write access to the crash spool dir.
void EnterSandbox(bool write_proc, bool log_to_stderr) {
  // If we're not root, we won't be able to jail ourselves (well, we could if
  // we used user namespaces, but maybe later).  Need to double check handling
  // when called by chrome to process its crashes.
  if (getuid() != 0)
    return;

  struct minijail* j = minijail_new();
  minijail_namespace_ipc(j);
  minijail_namespace_uts(j);
  minijail_namespace_net(j);
  minijail_namespace_vfs(j);
  // Remount mounts as MS_SLAVE to prevent crash_reporter from holding on to
  // mounts that might be unmounted in the root mount namespace.
  minijail_remount_mode(j, MS_SLAVE);
  minijail_mount_tmp(j);
  minijail_mount_dev(j);
  if (!log_to_stderr)
    minijail_bind(j, "/dev/log", "/dev/log", 0);
  minijail_no_new_privs(j);
  minijail_new_session_keyring(j);

  // If we're initializing the system, we need to write to /proc/sys/.
  if (!write_proc) {
    minijail_remount_proc_readonly(j);
  }

  minijail_enter(j);
  minijail_destroy(j);
}

}  // namespace

int main(int argc, char* argv[]) {
  DEFINE_bool(init, false, "Initialize crash logging");
  DEFINE_bool(boot_collect, false, "Run per-boot crash collection tasks");
  DEFINE_bool(clean_shutdown, false, "Signal clean shutdown");
  DEFINE_bool(clobber_state, false,
              "Report a run of clobber-state unrelated to a mount failure");
  DEFINE_bool(auth_failure, false, "Report auth failure");
  DEFINE_bool(mount_failure, false, "Report mount failure");
  DEFINE_bool(umount_failure, false, "Report umount failure");
  DEFINE_string(mount_device, "",
                "Device that failed to mount. Used with --mount_failure and "
                "--umount_failure");
  DEFINE_bool(testonly_send_all, false,
              "Ignore sampling for this crash and send it regardless. "
              "(This flag is ignored except during crash tests)");
  DEFINE_bool(ephemeral_collect, false,
              "Move crash reports to more persistent storage if available "
              "(tmpfs -> reboot vault) or (tmpfs/reboot vault -> encstateful)");
  DEFINE_bool(crash_test, false, "Crash test");
  DEFINE_bool(early, false,
              "Modifies crash-reporter to work during early boot");
  DEFINE_bool(preserve_across_clobber, false,
              "Persist early user crash reports across clobbers.");
  DEFINE_string(user, "", "User crash info (pid:signal:exec_name)");
  DEFINE_string(udev, "", "Udev event description (type:device:subsystem)");
  DEFINE_int32(weight, 1,
               "Weight to mark report. Used for sampling. "
               "(If we send 1/n reports, the weight should be n.)");
  DEFINE_bool(kernel_warning, false, "Report collected kernel warning");
  DEFINE_bool(kernel_iwlwifi_error, false,
              "Report collected kernel iwlwifi error");
  DEFINE_bool(kernel_ath10k_error, false,
              "Report collected kernel ath10k error");
  DEFINE_bool(kernel_wifi_warning, false,
              "Report collected kernel wifi warning");
  DEFINE_bool(kernel_smmu_fault, false, "Report collected kernel smmu faults");
  DEFINE_bool(kernel_suspend_warning, false,
              "Report collected kernel suspend warning");
  DEFINE_bool(missed_chrome_crash, false,
              "Report that we missed a Chrome crash");
  DEFINE_int32(recent_miss_count, -1,
               "For missed_chrome_crash, how many Chrome crashes have we "
               "missed over the last 1 minute");
  DEFINE_int32(recent_match_count, -1,
               "For missed_chrome_crash, how many Chrome crashes have we "
               "matched over the last 1 minute");
  DEFINE_int32(pending_miss_count, -1,
               "For missed_chrome_crash, how many Chrome crashes are we "
               "tracking that might be counted as a miss soon");
  DEFINE_bool(log_to_stderr, false, "Log to stderr instead of syslog.");
  DEFINE_string(arc_service_failure, "",
                "The specific ARC service name that failed");
  DEFINE_bool(suspend_failure, false, "Report collected suspend failure logs.");
  DEFINE_bool(vm_crash, false, "Report collected from VM crash");
  DEFINE_int32(vm_pid, -1, "PID of the main VM process");
  DEFINE_bool(crash_reporter_crashed, false,
              "Report crash_reporter itself crashing");
  DEFINE_string(service_failure, "", "The specific service name that failed");
  DEFINE_bool(security_anomaly, false, "Report collected security anomaly");
  DEFINE_bool(selinux_violation, false, "Report collected SELinux violation");
  // TODO(crbug.com/1000398): Remove --chrome flag after Chrome switches from
  // breakpad to crashpad.
  // Note: --chrome is being replaced by --chrome_memfd;
  //       --chrome_dump_dir is only used for tests and only used when
  // --chrome_memfd is used and not when --chrome is used.
  DEFINE_string(chrome, "", "Chrome crash dump file");
  DEFINE_int32(chrome_memfd, -1, "Chrome crash dump memfd");
  DEFINE_string(chrome_dump_dir, "",
                "Directory to write Chrome minidumps, used for tests only");
  DEFINE_int32(pid, -1, "PID of crashing process");
  DEFINE_int32(uid, -1, "UID of crashing process");
  DEFINE_string(exe, "", "Executable name of crashing process");
  DEFINE_string(error_key, "",
                "Key for error reports. Replaces exe for some errors that "
                "aren't tied to an executable. Unlike exe, this is not "
                "uploaded as part of the crash report.");
  DEFINE_int64(crash_loop_before, -1,
               "UNIX timestamp. If invoked before this time, use the special "
               "login-crash-loop handling system. (Keep crash report in memory "
               "and then pass to debugd for immediate upload.)");
  DEFINE_bool(core2md_failure, false, "Core2md failure test");
  DEFINE_bool(directory_failure, false, "Spool directory failure test");
  DEFINE_bool(
      always_allow_feedback, false,
      "Force if feedback is allowed check to return true, used for tests only");
#if USE_ARCPP || USE_ARCVM
  DEFINE_string(arc_java_crash, "",
                "Read Java crash log of the given type from standard input");
  DEFINE_string(arc_device, "", "Metadata for ARC crashes");
  DEFINE_string(arc_board, "", "Metadata for ARC crashes");
  DEFINE_string(arc_cpu_abi, "", "Metadata for ARC crashes");
  DEFINE_string(arc_fingerprint, "", "Metadata for ARC crashes");
  DEFINE_int64(arc_uptime, 0, "Uptime of ARC instance in milliseconds");
#endif
#if USE_ARCVM
  // TODO(b/169638371): Replace the word "native".
  DEFINE_bool(arc_native, false, "ARC Native Crash");
  DEFINE_int64(arc_native_time, -1,
               "UNIX timestamp of the time when the native crash happened. "
               "Metadata for ARCVM native crashes");
  DEFINE_bool(arc_kernel, false, "ARC Kernel Crash");
#endif

  OpenStandardFileDescriptors();

  FilePath my_path = util::GetPathToThisBinary(argv);

  brillo::FlagHelper::Init(argc, argv, "Chromium OS Crash Reporter");

  base::SingleThreadTaskExecutor task_executor(base::MessagePumpType::IO);
  base::FileDescriptorWatcher watcher(task_executor.task_runner());

  // In certain cases, /dev/log may not be available: log to stderr instead.
  if (FLAGS_log_to_stderr) {
    brillo::InitLog(brillo::kLogToStderr);
  } else {
    brillo::OpenLog(my_path.BaseName().value().c_str(), true);
    brillo::InitLog(brillo::kLogToSyslog);
  }

  if (util::SkipCrashCollection(argc, argv)) {
    return 0;
  }

  bool always_allow_feedback = false;
  if (FLAGS_always_allow_feedback) {
    CHECK(util::IsTestImage()) << "--always_allow_feedback is only for tests";
    LOG(INFO) << "--always_allow_feedback set; skipping consent check";
    always_allow_feedback = true;
  }

  bool testonly_send_all = false;
  if (FLAGS_testonly_send_all) {
    if (util::IsCrashTestInProgress()) {
      testonly_send_all = true;
    } else {
      LOG(ERROR) << "Ignoring --testonly_send_all since this is not a test";
    }
  }

  // Make it possible to test what happens when we crash while handling a crash.
  if (FLAGS_crash_test) {
    LOG(ERROR) << "crash_test requested";
    *(volatile char*)0 = 0;
    return 0;
  }

  // Now that we've processed the command line, sandbox ourselves.
  EnterSandbox(FLAGS_init || FLAGS_clean_shutdown, FLAGS_log_to_stderr);

  // Decide if we should use Crash-Loop sending mode. If session_manager sees
  // several Chrome crashes in a brief period, it will log the user out. On the
  // last Chrome startup before it logs the user out, it will set the
  // --crash_loop_before flag. The value of the flag will be a time_t timestamp
  // giving the last second at which a crash would be considered a crash loop
  // and thus log the user out. If we have another crash before that second,
  // we have detected a crash-loop and we want to invoke special handling
  // (specifically, we don't want to save the crash in the user's home directory
  // because that will be inaccessible to crash_sender once the user is logged
  // out).
  CrashCollector::CrashSendingMode crash_sending_mode =
      CrashCollector::kNormalCrashSendMode;
  if (FLAGS_crash_loop_before >= 0) {
    base::Time crash_loop_before =
        base::Time::FromTimeT(static_cast<time_t>(FLAGS_crash_loop_before));
    if (base::Time::Now() <= crash_loop_before) {
      crash_sending_mode = CrashCollector::kCrashLoopSendingMode;
      LOG(INFO) << "Using crash loop sending mode";
    }
  }

  UserCollectorBase::CrashAttributes user_crash_attrs;
  if (!FLAGS_user.empty()) {
    base::Optional<UserCollectorBase::CrashAttributes> attrs =
        UserCollectorBase::ParseCrashAttributes(FLAGS_user);
    if (!attrs.has_value()) {
      LOG(ERROR) << "Invalid parameter: --user=" << FLAGS_user;
      return 1;
    }
    user_crash_attrs = *attrs;
  }

  std::vector<CollectorInfo> collectors;

#if USE_ARCPP || USE_ARCVM
  arc_util::BuildProperty build_prop = {.device = FLAGS_arc_device,
                                        .board = FLAGS_arc_board,
                                        .cpu_abi = FLAGS_arc_cpu_abi,
                                        .fingerprint = FLAGS_arc_fingerprint};
#endif  // USE_ARCPP || USE_ARCVM

#if USE_ARCVM
  collectors.push_back(ArcvmCxxCollector::GetHandlerInfo(
      FLAGS_arc_native, build_prop,
      ArcvmCxxCollector::CrashInfo{
          .time = static_cast<time_t>(FLAGS_arc_native_time),
          .pid = FLAGS_pid,
          .exec_name = FLAGS_exe},
      FLAGS_arc_uptime));

  collectors.push_back(
      ArcvmKernelCollector::GetHandlerInfo(FLAGS_arc_kernel, build_prop));
#endif  // USE_ARCVM

#if USE_ARCPP || USE_ARCVM
  collectors.push_back(ArcJavaCollector::GetHandlerInfo(
      FLAGS_arc_java_crash, build_prop, FLAGS_arc_uptime));
#endif  // USE_ARCPP || USE_ARCVM

#if USE_ARCPP
  auto arcpp_cxx_collector = std::make_shared<ArcppCxxCollector>();

  // Always initialize arcpp_cxx_collector so that we can use it to determine
  // whether the process is a process in the ARC++ container or a normal
  // process of the host.
  arcpp_cxx_collector->Initialize(FLAGS_directory_failure, false /* early */);
  bool is_arcpp_cxx_process =
      !FLAGS_user.empty() && ArcppCxxCollector::IsArcRunning() &&
      arcpp_cxx_collector->IsArcProcess(user_crash_attrs.pid);

  collectors.push_back({
      .collector = arcpp_cxx_collector,
      .init = base::DoNothing(),
      .handlers = {{
          // This handles native crashes of ARC++.
          .should_handle = is_arcpp_cxx_process,
          .cb = base::BindRepeating(&ArcppCxxCollector::HandleCrash,
                                    arcpp_cxx_collector, user_crash_attrs,
                                    nullptr),
      }},
  });
#else   // USE_ARCPP
  bool is_arcpp_cxx_process = false;
#endif  // USE_ARCPP

  auto user_collector = std::make_shared<UserCollector>();
  collectors.push_back({
      .collector = user_collector,
      .init = base::BindRepeating(&UserCollector::Initialize, user_collector,
                                  my_path.value(), FLAGS_core2md_failure,
                                  FLAGS_directory_failure, FLAGS_early),
      .handlers = {{
                       // NOTE: This is not handling a crash; it's instead
                       // initializing the entire crash reporting system.
                       // So, leave |cb| unset and call InitializeSystem
                       // manually below.
                       .should_handle = FLAGS_init,
                   },
                   {
                       .should_handle = FLAGS_clean_shutdown,
                       // Leave cb unset: clean_shutdown requires other
                       // collectors, so it's handled later.
                   },
                   {
                       .should_handle =
                           !FLAGS_user.empty() && !is_arcpp_cxx_process,
                       .cb = base::BindRepeating(&UserCollector::HandleCrash,
                                                 user_collector,
                                                 user_crash_attrs, nullptr),
                   }},
  });

  auto ephemeral_crash_collector = std::make_shared<EphemeralCrashCollector>();
  collectors.push_back({
      .collector = ephemeral_crash_collector,
      .init = base::BindRepeating(&EphemeralCrashCollector::Initialize,
                                  ephemeral_crash_collector,
                                  FLAGS_preserve_across_clobber),
      .handlers =
          {{
               .should_handle = FLAGS_ephemeral_collect,
               .cb = base::BindRepeating(&EphemeralCrashCollector::Collect,
                                         ephemeral_crash_collector),
           },
           {
               .should_handle = FLAGS_boot_collect,
               // leave cb empty because boot_collect needs multiple collectors.
               // It's handled separately at the end of main.
           }},
  });

  collectors.push_back(
      ClobberStateCollector::GetHandlerInfo(FLAGS_clobber_state));

  collectors.push_back(MountFailureCollector::GetHandlerInfo(
      FLAGS_mount_device, testonly_send_all, FLAGS_mount_failure,
      FLAGS_umount_failure));

  collectors.push_back(MissedCrashCollector::GetHandlerInfo(
      FLAGS_missed_chrome_crash, FLAGS_pid, FLAGS_recent_miss_count,
      FLAGS_recent_match_count, FLAGS_pending_miss_count));

  auto unclean_shutdown_collector =
      std::make_shared<UncleanShutdownCollector>();
  collectors.push_back({
      .collector = unclean_shutdown_collector,
      .handlers = {{
          .should_handle = FLAGS_boot_collect || FLAGS_clean_shutdown,
          // leave cb empty because both of these need multiple collectors and
          // are handled separately at the end of main.
      }},
  });

  std::vector<InvocationInfo> boot_handlers = {{
      .should_handle = FLAGS_boot_collect,
      // leave cb empty because boot_collect needs multiple collectors and is
      // handled separately at the end of main. should_handle is only true so
      // the collector gets initialized.
  }};

  auto kernel_collector = std::make_shared<KernelCollector>();
  collectors.push_back({
      .collector = kernel_collector,
      .handlers = boot_handlers,
  });

  auto ec_collector = std::make_shared<ECCollector>();
  collectors.push_back({
      .collector = ec_collector,
      .handlers = boot_handlers,
  });

  auto bert_collector = std::make_shared<BERTCollector>();
  collectors.push_back({
      .collector = bert_collector,
      .handlers = boot_handlers,
  });

  collectors.push_back(UdevCollector::GetHandlerInfo(FLAGS_udev));

  collectors.push_back(ChromeCollector::GetHandlerInfo(
      crash_sending_mode, FLAGS_chrome, FLAGS_chrome_memfd, FLAGS_pid,
      FLAGS_uid, FLAGS_exe, FLAGS_error_key, FLAGS_chrome_dump_dir));

  collectors.push_back(KernelWarningCollector::GetHandlerInfo(
      FLAGS_weight, FLAGS_kernel_warning, FLAGS_kernel_wifi_warning,
      FLAGS_kernel_smmu_fault, FLAGS_kernel_suspend_warning,
      FLAGS_kernel_iwlwifi_error, FLAGS_kernel_ath10k_error));

  collectors.push_back(GenericFailureCollector::GetHandlerInfo(
      FLAGS_suspend_failure, FLAGS_auth_failure, FLAGS_arc_service_failure,
      FLAGS_service_failure));

  collectors.push_back(
      SELinuxViolationCollector::GetHandlerInfo(FLAGS_selinux_violation));

  collectors.push_back(CrashReporterFailureCollector::GetHandlerInfo(
      FLAGS_crash_reporter_crashed));

  collectors.push_back(
      VmCollector::GetHandlerInfo(FLAGS_vm_crash, FLAGS_vm_pid));

  collectors.push_back(SecurityAnomalyCollector::GetHandlerInfo(
      FLAGS_weight, FLAGS_security_anomaly));

  for (const CollectorInfo& collector : collectors) {
    bool ran_init = false;
    for (const InvocationInfo& info : collector.handlers) {
      if (info.should_handle) {
        if (!ran_init) {
          if (collector.init) {
            collector.init.Run();
          } else {
            collector.collector->Initialize(FLAGS_early);
          }
          ran_init = true;
        }
        if (info.cb) {
          // Accumulate logs to a string to help in diagnosing failures during
          // collection.
          brillo::LogToString(true);

          // Default to successful exit status if there's no consent.
          bool handled = true;
          // For early boot crash collectors, the consent file will not be
          // accessible.  Instead, check consent during boot collection.
          if (FLAGS_early || always_allow_feedback ||
              util::IsFeedbackAllowed(&s_metrics_lib)) {
            handled = info.cb.Run();
          } else if (collector.collector == ephemeral_crash_collector &&
                     ephemeral_crash_collector->SkipConsent()) {
            // Due to the specific circumstances in which the ephemeral
            // collector runs, it might need to skip consent checks (e.g. if
            // it's running just after a disk clobber, the clobber may have
            // wiped out a user's preferences). Other collectors should not skip
            // consent checks.
            handled = info.cb.Run();
          }
          brillo::LogToString(false);
          return handled ? 0 : 1;
        }
      }
    }
  }

  if (FLAGS_init) {
    // Called manually to skip the normal consent checks; we always initialize
    // the system regardless of consent.
    return InitializeSystem(user_collector, FLAGS_early) ? 0 : 1;
  }

  // These special cases (which use multiple collectors) are at the end so that
  // it's clear that all relevant collectors have been initialized.
  if (FLAGS_boot_collect) {
    return BootCollect(always_allow_feedback, kernel_collector, ec_collector,
                       bert_collector, unclean_shutdown_collector,
                       ephemeral_crash_collector);
  }

  if (FLAGS_clean_shutdown) {
    int ret = 0;
    if (!unclean_shutdown_collector->Disable())
      ret = 1;
    if (!user_collector->Disable())
      ret = 1;
    return ret;
  }

  LOG(ERROR) << "Nothing to do! (Bad arguments?)";
  return 1;
}