1 /*
2 * Copyright (C) 2020 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 #include <chrono>
18 #include <thread>
19
20 #include "apexd.h"
21 #include "apexd_lifecycle.h"
22
23 #include <android-base/logging.h>
24 #include <android-base/properties.h>
25
26 #include "apexd_utils.h"
27
28 using android::base::GetProperty;
29 using android::base::Result;
30 using android::base::WaitForProperty;
31
32 constexpr int MAX_WAIT_COUNT = 60;
33 constexpr int WAIT_DURATION_SECONDS = 10;
34 static const char* BOOT_TIMEOUT = "BootTimeout"; // NOLINT
35
36 namespace android {
37 namespace apex {
38
IsBooting()39 bool ApexdLifecycle::IsBooting() {
40 auto status = GetProperty(kApexStatusSysprop, "");
41 return status != kApexStatusReady && status != kApexStatusActivated;
42 }
43
RevertActiveSessions(const std::string & process,const std::string & error)44 void ApexdLifecycle::RevertActiveSessions(const std::string& process,
45 const std::string& error) {
46 auto result = RevertActiveSessionsAndReboot(process, error);
47 if (!result.ok()) {
48 if (error != BOOT_TIMEOUT) {
49 LOG(ERROR) << "Revert failed : " << result.error();
50 // Can not anything more but loop until boot successfully
51 while (!boot_completed_) {
52 std::this_thread::sleep_for(std::chrono::seconds(1));
53 }
54 return;
55 }
56 }
57 // This should never be reached
58 LOG(FATAL) << "Active sessions were reverted, but reboot wasn't triggered.";
59 }
60
WaitForBootStatus(const bool has_active_session)61 void ApexdLifecycle::WaitForBootStatus(const bool has_active_session) {
62 int wait_count = 0;
63 while (!boot_completed_) {
64 // Check for change in either crashing property or sys.boot_completed
65 // Wait for updatable_crashing property change for most of the time
66 // (arbitrary 10s), briefly check if boot has completed successfully,
67 // if not continue waiting for updatable_crashing.
68 // We use this strategy so that we can quickly detect if an updatable
69 // process is crashing.
70 if (WaitForProperty("sys.init.updatable_crashing", "1",
71 std::chrono::seconds(WAIT_DURATION_SECONDS))) {
72 auto name = GetProperty("sys.init.updatable_crashing_process_name", "");
73 LOG(ERROR) << "Native process '" << (name.empty() ? "[unknown]" : name)
74 << "' is crashing. Attempting a revert";
75 RevertActiveSessions(name, "");
76 }
77 // Check if system stuck in boot screen and revert the staging apex once
78 if (has_active_session && ++wait_count == MAX_WAIT_COUNT) {
79 LOG(ERROR) << "System didn't finish boot in "
80 << (WAIT_DURATION_SECONDS * MAX_WAIT_COUNT)
81 << " seconds. Attempting a revert";
82 RevertActiveSessions("", BOOT_TIMEOUT);
83 }
84 }
85 }
86
MarkBootCompleted()87 void ApexdLifecycle::MarkBootCompleted() { boot_completed_ = true; }
88
89 } // namespace apex
90 } // namespace android
91