1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "apexd"
18
19 #include "apexd_prop.h"
20
21 #include <android-base/logging.h>
22 #include <android-base/properties.h>
23
24 #include "apexd_utils.h"
25
26 namespace android {
27 namespace apex {
waitForBootStatus(Status (& rollback_fn)(),void (& complete_fn)())28 void waitForBootStatus(Status (&rollback_fn)(), void (&complete_fn)()) {
29 while (true) {
30 // Check for change in either crashing property or sys.boot_completed
31 // Wait for updatable_crashing property change for most of the time
32 // (arbitrary 30s), briefly check if boot has completed successfully,
33 // if not continue waiting for updatable_crashing.
34 // We use this strategy so that we can quickly detect if an updatable
35 // process is crashing.
36 if (android::base::WaitForProperty("ro.init.updatable_crashing", "1",
37 std::chrono::seconds(30))) {
38 LOG(INFO) << "Updatable crashing, attempting rollback";
39 auto status = rollback_fn();
40 if (!status.Ok()) {
41 LOG(ERROR) << "Rollback failed : " << status.ErrorMessage();
42 } else {
43 LOG(INFO) << "Successfuly rolled back. Rebooting device";
44 Reboot();
45 }
46 return;
47 }
48 if (android::base::GetProperty("sys.boot_completed", "") == "1") {
49 // Boot completed we can return
50 complete_fn();
51 return;
52 }
53 }
54 }
55 } // namespace apex
56 } // namespace android
57