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 using android::base::GetBoolProperty;
27 using android::base::GetProperty;
28 using android::base::Result;
29 using android::base::WaitForProperty;
30
31 namespace android {
32 namespace apex {
waitForBootStatus(Result<void> (& revert_fn)(const std::string &),void (& complete_fn)())33 void waitForBootStatus(Result<void> (&revert_fn)(const std::string&),
34 void (&complete_fn)()) {
35 while (!GetBoolProperty("sys.boot_completed", false)) {
36 // Check for change in either crashing property or sys.boot_completed
37 // Wait for updatable_crashing property change for most of the time
38 // (arbitrary 30s), briefly check if boot has completed successfully,
39 // if not continue waiting for updatable_crashing.
40 // We use this strategy so that we can quickly detect if an updatable
41 // process is crashing.
42 if (WaitForProperty("sys.init.updatable_crashing", "1",
43 std::chrono::seconds(30))) {
44 auto name = GetProperty("sys.init.updatable_crashing_process_name", "");
45 LOG(ERROR) << "Native process '" << (name.empty() ? "[unknown]" : name)
46 << "' is crashing. Attempting a revert";
47 auto result = revert_fn(name);
48 if (!result.ok()) {
49 LOG(ERROR) << "Revert failed : " << result.error();
50 break;
51 } else {
52 // This should never be reached, since revert_fn should've rebooted a
53 // device. But if for some reason we end up here, let's reboot it
54 // manually.
55 LOG(ERROR) << "Active sessions were reverted, but reboot wasn't "
56 "triggered. Rebooting manually";
57 Reboot();
58 return;
59 }
60 }
61 }
62 // Wait for boot to complete, and then run complete_fn.
63 // TODO(b/158467962): this is a hack, instead we should have a binder call
64 // from system_server into apexd when boot completes.
65 if (WaitForProperty("sys.boot_completed", "1", std::chrono::minutes(5))) {
66 complete_fn();
67 return;
68 } else {
69 LOG(ERROR) << "Boot never completed";
70 }
71 }
72 } // namespace apex
73 } // namespace android
74