shell/kernel_panic/lib/main.dart

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';
import 'dart:io';

import 'package:flutter/widgets.dart';

import 'kernel_panic.dart';

Future<Null> main() async {
  runApp(
    new Directionality(
      textDirection: TextDirection.ltr,
      child: new _KernelPanicReader(),
    ),
  );
}

class _KernelPanicReader extends StatefulWidget {
  @override
  _KernelPanicReaderState createState() => new _KernelPanicReaderState();
}

class _KernelPanicReaderState extends State<_KernelPanicReader> {
  String _lastPanicString = '';

  @override
  void initState() {
    super.initState();

    File lastPanic = new File('/boot/log/last-panic.txt');
    if (lastPanic.existsSync()) {
      lastPanic.readAsString().then((String lastPanicString) {
        if (lastPanicString.isEmpty) {
          exit(0);
        } else {
          setState(
            () {
              _lastPanicString = lastPanicString;
            },
          );
        }
      });
    } else {
      exit(0);
    }
  }

  @override
  Widget build(BuildContext context) => _lastPanicString.isEmpty
      ? new Container()
      : new KernelPanic(
          kernelPanic: _lastPanicString,
          onDismiss: () => exit(0),
        );
}