Merge "Add reason why userspace reboot shutdown sequence failed" am: dfcf2e8a

static Result<void> DoUserspaceReboot() {

    LOG(INFO) << "Userspace reboot initiated";

    auto guard = android::base::make_scope_guard([] {

    // An ugly way to pass a more precise reason on why fallback to hard reboot was triggered.

    std::string sub_reason = "";

    auto guard = android::base::make_scope_guard([&sub_reason] {

        // Leave shutdown so that we can handle a full reboot.

        LeaveShutdown();

        trigger_shutdown("reboot,userspace_failed,shutdown_aborted");

        trigger_shutdown("reboot,userspace_failed,shutdown_aborted," + sub_reason);

    });

    // Triggering userspace-reboot-requested will result in a bunch of setprop

    // actions. We should make sure, that all of them are propagated before

    // proceeding with userspace reboot. Synchronously setting sys.init.userspace_reboot.in_progress

    // property is not perfect, but it should do the trick.

    if (!android::sysprop::InitProperties::userspace_reboot_in_progress(true)) {

        sub_reason = "setprop";

        return Error() << "Failed to set sys.init.userspace_reboot.in_progress property";

    }

    EnterShutdown();

    if (!SetProperty("sys.powerctl", "")) {

        sub_reason = "resetprop";

        return Error() << "Failed to reset sys.powerctl property";

    }

    std::vector<Service*> stop_first;

    StopServicesAndLogViolations(stop_first, sigterm_timeout, true /* SIGTERM */);

    if (int r = StopServicesAndLogViolations(stop_first, sigkill_timeout, false /* SIGKILL */);

        r > 0) {

        sub_reason = "sigkill";

        // TODO(b/135984674): store information about offending services for debugging.

        return Error() << r << " post-data services are still running";

    }

    if (auto result = KillZramBackingDevice(); !result.ok()) {

        sub_reason = "zram";

        return result;

    }

    if (auto result = CallVdc("volume", "reset"); !result.ok()) {

        sub_reason = "vold_reset";

        return result;

    }

    if (int r = StopServicesAndLogViolations(GetDebuggingServices(true /* only_post_data */),

                                             sigkill_timeout, false /* SIGKILL */);

        r > 0) {

        sub_reason = "sigkill_debug";

        // TODO(b/135984674): store information about offending services for debugging.

        return Error() << r << " debugging services are still running";

    }

        LOG(INFO) << "sync() took " << sync_timer;

    }

    if (auto result = UnmountAllApexes(); !result.ok()) {

        sub_reason = "apex";

        return result;

    }

    if (!SwitchToBootstrapMountNamespaceIfNeeded()) {

        sub_reason = "ns_switch";

        return Error() << "Failed to switch to bootstrap namespace";

    }

    // Remove services that were defined in an APEX.