1 /*
2 * Copyright (C) 2023 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 // This binary is run on boot as a oneshot service. It should not be run at any
18 // other point.
19
20 #include <string>
21
22 #include "android-base/logging.h"
23 #include "android-base/properties.h"
24
SetPropertyAndLog(const std::string & key,const std::string & value,const std::string & message="")25 static void SetPropertyAndLog(const std::string& key,
26 const std::string& value,
27 const std::string& message = "") {
28 if (android::base::SetProperty(key, value)) {
29 LOG(INFO) << "Set property " << key << " to " << value << " " << message;
30 } else {
31 LOG(ERROR) << "Failed to set property " << key << " to " << value << " " << message;
32 }
33 }
34
35 // Copies the value of one system property to another if it isn't empty and
36 // passes the predicate test_fn.
CopyPropertyIf(const char * src,const char * dst,bool (* test_fn)(const std::string &))37 static void CopyPropertyIf(const char* src, const char* dst, bool (*test_fn)(const std::string&)) {
38 std::string prop = android::base::GetProperty(src, "");
39 if (prop.empty()) {
40 LOG(INFO) << "Property " << src << " not set";
41 } else if (!test_fn(prop)) {
42 LOG(INFO) << "Property " << src << " has ignored value " << prop;
43 } else {
44 SetPropertyAndLog(dst, prop, std::string("from ") + src);
45 }
46 }
47
main(int,char ** argv)48 int main(int, char** argv) {
49 android::base::InitLogging(argv);
50
51 // Copy properties that must only be set at boot and not change value later.
52 // Note that P/H can change the properties in the experiment namespaces at any
53 // time.
54 CopyPropertyIf("persist.device_config.runtime_native_boot.useartservice",
55 "dalvik.vm.useartservice",
56 // If an OEM has set dalvik.vm.useartservice to false we
57 // shouldn't override it to true from the P/H property.
58 [](const std::string& prop) { return prop == "false"; });
59
60 return 0;
61 }
62