1 //
2 // Copyright (C) 2016 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 <sysexits.h>
18 #include <unistd.h>
19
20 #include <string>
21 #include <vector>
22
23 #include <base/bind.h>
24 #include <base/callback.h>
25 #include <base/command_line.h>
26 #include <base/logging.h>
27 #include <base/strings/string_split.h>
28 #include <binder/IServiceManager.h>
29 #include <binderwrapper/binder_wrapper.h>
30 #include <brillo/binder_watcher.h>
31 #include <brillo/daemons/daemon.h>
32 #include <brillo/flag_helper.h>
33 #include <brillo/message_loops/message_loop.h>
34 #include <brillo/syslog_logging.h>
35 #include <utils/String16.h>
36 #include <utils/StrongPointer.h>
37
38 #include "android/os/BnUpdateEngineCallback.h"
39 #include "android/os/IUpdateEngine.h"
40 #include "update_engine/client_library/include/update_engine/update_status.h"
41 #include "update_engine/common/error_code.h"
42 #include "update_engine/common/error_code_utils.h"
43 #include "update_engine/update_status_utils.h"
44
45 using android::binder::Status;
46
47 namespace chromeos_update_engine {
48 namespace internal {
49
50 class UpdateEngineClientAndroid : public brillo::Daemon {
51 public:
UpdateEngineClientAndroid(int argc,char ** argv)52 UpdateEngineClientAndroid(int argc, char** argv) : argc_(argc), argv_(argv) {
53 }
54
55 int ExitWhenIdle(const Status& status);
56 int ExitWhenIdle(int return_code);
57
58 private:
59 class UECallback : public android::os::BnUpdateEngineCallback {
60 public:
UECallback(UpdateEngineClientAndroid * client)61 explicit UECallback(UpdateEngineClientAndroid* client) : client_(client) {}
62
63 // android::os::BnUpdateEngineCallback overrides.
64 Status onStatusUpdate(int status_code, float progress) override;
65 Status onPayloadApplicationComplete(int error_code) override;
66
67 private:
68 UpdateEngineClientAndroid* client_;
69 };
70
71 int OnInit() override;
72
73 // Called whenever the UpdateEngine daemon dies.
74 void UpdateEngineServiceDied();
75
76 // Copy of argc and argv passed to main().
77 int argc_;
78 char** argv_;
79
80 android::sp<android::os::IUpdateEngine> service_;
81 android::sp<android::os::BnUpdateEngineCallback> callback_;
82
83 brillo::BinderWatcher binder_watcher_;
84 };
85
onStatusUpdate(int status_code,float progress)86 Status UpdateEngineClientAndroid::UECallback::onStatusUpdate(
87 int status_code, float progress) {
88 update_engine::UpdateStatus status =
89 static_cast<update_engine::UpdateStatus>(status_code);
90 LOG(INFO) << "onStatusUpdate(" << UpdateStatusToString(status) << " ("
91 << status_code << "), " << progress << ")";
92 return Status::ok();
93 }
94
onPayloadApplicationComplete(int error_code)95 Status UpdateEngineClientAndroid::UECallback::onPayloadApplicationComplete(
96 int error_code) {
97 ErrorCode code = static_cast<ErrorCode>(error_code);
98 LOG(INFO) << "onPayloadApplicationComplete(" << utils::ErrorCodeToString(code)
99 << " (" << error_code << "))";
100 client_->ExitWhenIdle(code == ErrorCode::kSuccess ? EX_OK : 1);
101 return Status::ok();
102 }
103
OnInit()104 int UpdateEngineClientAndroid::OnInit() {
105 int ret = Daemon::OnInit();
106 if (ret != EX_OK)
107 return ret;
108
109 DEFINE_bool(update, false, "Start a new update, if no update in progress.");
110 DEFINE_string(payload,
111 "http://127.0.0.1:8080/payload",
112 "The URI to the update payload to use.");
113 DEFINE_int64(offset, 0,
114 "The offset in the payload where the CrAU update starts. "
115 "Used when --update is passed.");
116 DEFINE_int64(size, 0,
117 "The size of the CrAU part of the payload. If 0 is passed, it "
118 "will be autodetected. Used when --update is passed.");
119 DEFINE_string(headers,
120 "",
121 "A list of key-value pairs, one element of the list per line. "
122 "Used when --update is passed.");
123
124 DEFINE_bool(suspend, false, "Suspend an ongoing update and exit.");
125 DEFINE_bool(resume, false, "Resume a suspended update.");
126 DEFINE_bool(cancel, false, "Cancel the ongoing update and exit.");
127 DEFINE_bool(reset_status, false, "Reset an already applied update and exit.");
128 DEFINE_bool(follow,
129 false,
130 "Follow status update changes until a final state is reached. "
131 "Exit status is 0 if the update succeeded, and 1 otherwise.");
132
133 // Boilerplate init commands.
134 base::CommandLine::Init(argc_, argv_);
135 brillo::FlagHelper::Init(argc_, argv_, "Android Update Engine Client");
136 if (argc_ == 1) {
137 LOG(ERROR) << "Nothing to do. Run with --help for help.";
138 return 1;
139 }
140
141 // Ensure there are no positional arguments.
142 const std::vector<std::string> positional_args =
143 base::CommandLine::ForCurrentProcess()->GetArgs();
144 if (!positional_args.empty()) {
145 LOG(ERROR) << "Found a positional argument '" << positional_args.front()
146 << "'. If you want to pass a value to a flag, pass it as "
147 "--flag=value.";
148 return 1;
149 }
150
151 bool keep_running = false;
152 brillo::InitLog(brillo::kLogToStderr);
153
154 // Initialize a binder watcher early in the process before any interaction
155 // with the binder driver.
156 binder_watcher_.Init();
157
158 android::status_t status = android::getService(
159 android::String16("android.os.UpdateEngineService"), &service_);
160 if (status != android::OK) {
161 LOG(ERROR) << "Failed to get IUpdateEngine binder from service manager: "
162 << Status::fromStatusT(status).toString8();
163 return ExitWhenIdle(1);
164 }
165
166 if (FLAGS_suspend) {
167 return ExitWhenIdle(service_->suspend());
168 }
169
170 if (FLAGS_resume) {
171 return ExitWhenIdle(service_->resume());
172 }
173
174 if (FLAGS_cancel) {
175 return ExitWhenIdle(service_->cancel());
176 }
177
178 if (FLAGS_reset_status) {
179 return ExitWhenIdle(service_->resetStatus());
180 }
181
182 if (FLAGS_follow) {
183 // Register a callback object with the service.
184 callback_ = new UECallback(this);
185 bool bound;
186 if (!service_->bind(callback_, &bound).isOk() || !bound) {
187 LOG(ERROR) << "Failed to bind() the UpdateEngine daemon.";
188 return 1;
189 }
190 keep_running = true;
191 }
192
193 if (FLAGS_update) {
194 std::vector<std::string> headers = base::SplitString(
195 FLAGS_headers, "\n", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
196 std::vector<android::String16> and_headers;
197 for (const auto& header : headers) {
198 and_headers.push_back(android::String16{header.data(), header.size()});
199 }
200 Status status = service_->applyPayload(
201 android::String16{FLAGS_payload.data(), FLAGS_payload.size()},
202 FLAGS_offset,
203 FLAGS_size,
204 and_headers);
205 if (!status.isOk())
206 return ExitWhenIdle(status);
207 }
208
209 if (!keep_running)
210 return ExitWhenIdle(EX_OK);
211
212 // When following updates status changes, exit if the update_engine daemon
213 // dies.
214 android::BinderWrapper::Create();
215 android::BinderWrapper::Get()->RegisterForDeathNotifications(
216 android::os::IUpdateEngine::asBinder(service_),
217 base::Bind(&UpdateEngineClientAndroid::UpdateEngineServiceDied,
218 base::Unretained(this)));
219
220 return EX_OK;
221 }
222
ExitWhenIdle(const Status & status)223 int UpdateEngineClientAndroid::ExitWhenIdle(const Status& status) {
224 if (status.isOk())
225 return ExitWhenIdle(EX_OK);
226 LOG(ERROR) << status.toString8();
227 return ExitWhenIdle(status.exceptionCode());
228 }
229
ExitWhenIdle(int return_code)230 int UpdateEngineClientAndroid::ExitWhenIdle(int return_code) {
231 auto delayed_exit = base::Bind(
232 &Daemon::QuitWithExitCode, base::Unretained(this), return_code);
233 if (!brillo::MessageLoop::current()->PostTask(delayed_exit))
234 return 1;
235 return EX_OK;
236 }
237
UpdateEngineServiceDied()238 void UpdateEngineClientAndroid::UpdateEngineServiceDied() {
239 LOG(ERROR) << "UpdateEngineService died.";
240 QuitWithExitCode(1);
241 }
242
243 } // namespace internal
244 } // namespace chromeos_update_engine
245
main(int argc,char ** argv)246 int main(int argc, char** argv) {
247 chromeos_update_engine::internal::UpdateEngineClientAndroid client(
248 argc, argv);
249 return client.Run();
250 }
251