1 //
2 // Copyright (C) 2015 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 "update_engine/daemon.h"
18
19 #include <sysexits.h>
20
21 #include <base/bind.h>
22 #include <base/location.h>
23 #include <base/time/time.h>
24 #if USE_WEAVE || USE_BINDER
25 #include <binderwrapper/binder_wrapper.h>
26 #endif // USE_WEAVE || USE_BINDER
27
28 #if defined(__BRILLO__) || defined(__CHROMEOS__)
29 #include "update_engine/real_system_state.h"
30 #else // !(defined(__BRILLO__) || defined(__CHROMEOS__))
31 #include "update_engine/daemon_state_android.h"
32 #endif // defined(__BRILLO__) || defined(__CHROMEOS__)
33
34 #if USE_DBUS
35 namespace {
36 const int kDBusSystemMaxWaitSeconds = 2 * 60;
37 } // namespace
38 #endif // USE_DBUS
39
40 namespace chromeos_update_engine {
41
OnInit()42 int UpdateEngineDaemon::OnInit() {
43 // Register the |subprocess_| singleton with this Daemon as the signal
44 // handler.
45 subprocess_.Init(this);
46
47 int exit_code = Daemon::OnInit();
48 if (exit_code != EX_OK)
49 return exit_code;
50
51 #if USE_WEAVE || USE_BINDER
52 android::BinderWrapper::Create();
53 binder_watcher_.Init();
54 #endif // USE_WEAVE || USE_BINDER
55
56 #if USE_DBUS
57 // We wait for the D-Bus connection for up two minutes to avoid re-spawning
58 // the daemon too fast causing thrashing if dbus-daemon is not running.
59 scoped_refptr<dbus::Bus> bus = dbus_connection_.ConnectWithTimeout(
60 base::TimeDelta::FromSeconds(kDBusSystemMaxWaitSeconds));
61
62 if (!bus) {
63 // TODO(deymo): Make it possible to run update_engine even if dbus-daemon
64 // is not running or constantly crashing.
65 LOG(ERROR) << "Failed to initialize DBus, aborting.";
66 return 1;
67 }
68
69 CHECK(bus->SetUpAsyncOperations());
70 #endif // USE_DBUS
71
72 #if defined(__BRILLO__) || defined(__CHROMEOS__)
73 // Initialize update engine global state but continue if something fails.
74 // TODO(deymo): Move the daemon_state_ initialization to a factory method
75 // avoiding the explicit re-usage of the |bus| instance, shared between
76 // D-Bus service and D-Bus client calls.
77 RealSystemState* real_system_state = new RealSystemState(bus);
78 daemon_state_.reset(real_system_state);
79 LOG_IF(ERROR, !real_system_state->Initialize())
80 << "Failed to initialize system state.";
81 #else // !(defined(__BRILLO__) || defined(__CHROMEOS__))
82 DaemonStateAndroid* daemon_state_android = new DaemonStateAndroid();
83 daemon_state_.reset(daemon_state_android);
84 LOG_IF(ERROR, !daemon_state_android->Initialize())
85 << "Failed to initialize system state.";
86 #endif // defined(__BRILLO__) || defined(__CHROMEOS__)
87
88 #if USE_BINDER
89 // Create the Binder Service.
90 #if defined(__BRILLO__) || defined(__CHROMEOS__)
91 binder_service_ = new BinderUpdateEngineBrilloService{real_system_state};
92 #else // !(defined(__BRILLO__) || defined(__CHROMEOS__))
93 binder_service_ = new BinderUpdateEngineAndroidService{
94 daemon_state_android->service_delegate()};
95 #endif // defined(__BRILLO__) || defined(__CHROMEOS__)
96 auto binder_wrapper = android::BinderWrapper::Get();
97 if (!binder_wrapper->RegisterService(binder_service_->ServiceName(),
98 binder_service_)) {
99 LOG(ERROR) << "Failed to register binder service.";
100 }
101
102 daemon_state_->AddObserver(binder_service_.get());
103 #endif // USE_BINDER
104
105 #if USE_DBUS
106 // Create the DBus service.
107 dbus_adaptor_.reset(new UpdateEngineAdaptor(real_system_state, bus));
108 daemon_state_->AddObserver(dbus_adaptor_.get());
109
110 dbus_adaptor_->RegisterAsync(base::Bind(&UpdateEngineDaemon::OnDBusRegistered,
111 base::Unretained(this)));
112 LOG(INFO) << "Waiting for DBus object to be registered.";
113 #else // !USE_DBUS
114 daemon_state_->StartUpdater();
115 #endif // USE_DBUS
116 return EX_OK;
117 }
118
119 #if USE_DBUS
OnDBusRegistered(bool succeeded)120 void UpdateEngineDaemon::OnDBusRegistered(bool succeeded) {
121 if (!succeeded) {
122 LOG(ERROR) << "Registering the UpdateEngineAdaptor";
123 QuitWithExitCode(1);
124 return;
125 }
126
127 // Take ownership of the service now that everything is initialized. We need
128 // to this now and not before to avoid exposing a well known DBus service
129 // path that doesn't have the service it is supposed to implement.
130 if (!dbus_adaptor_->RequestOwnership()) {
131 LOG(ERROR) << "Unable to take ownership of the DBus service, is there "
132 << "other update_engine daemon running?";
133 QuitWithExitCode(1);
134 return;
135 }
136 daemon_state_->StartUpdater();
137 }
138 #endif // USE_DBUS
139
140 } // namespace chromeos_update_engine
141