Reland: Add getprop to toolbox
Add a non-toybox version of getprop, so that we can interface with the
new C++ PropertyInfoAreaFile class to return property context
information.
Bug: 36001741
Test: Compared toolbox getprop results with toybox getprop
Change-Id: I4e90aa5b843cb5cfcbe85f05f23ae8e22729b26e
diff --git a/toolbox/getprop.cpp b/toolbox/getprop.cpp
new file mode 100644
index 0000000..611e244
--- /dev/null
+++ b/toolbox/getprop.cpp
@@ -0,0 +1,127 @@
+//
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include <getopt.h>
+#include <sys/system_properties.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <android-base/properties.h>
+#include <property_info_parser/property_info_parser.h>
+
+using android::base::GetProperty;
+using android::properties::PropertyInfoAreaFile;
+
+PropertyInfoAreaFile property_info_file;
+
+void PrintAllProperties(bool print_property_context) {
+ std::vector<std::pair<std::string, std::string>> properties;
+ __system_property_foreach(
+ [](const prop_info* pi, void* cookie) {
+ __system_property_read_callback(
+ pi,
+ [](void* cookie, const char* name, const char* value, unsigned) {
+ auto properties =
+ reinterpret_cast<std::vector<std::pair<std::string, std::string>>*>(cookie);
+ properties->emplace_back(name, value);
+ },
+ cookie);
+ },
+ &properties);
+
+ std::sort(properties.begin(), properties.end());
+
+ if (print_property_context) {
+ for (auto& [name, value] : properties) {
+ const char* context = nullptr;
+ property_info_file->GetPropertyInfo(name.c_str(), &context, nullptr);
+ value = context;
+ }
+ }
+
+ for (const auto& [name, value] : properties) {
+ std::cout << "[" << name << "]: [" << value << "]" << std::endl;
+ }
+}
+
+void PrintProperty(const char* name, const char* default_value, bool print_property_context) {
+ if (print_property_context) {
+ const char* context = nullptr;
+ property_info_file->GetPropertyInfo(name, &context, nullptr);
+ std::cout << context << std::endl;
+ } else {
+ std::cout << GetProperty(name, default_value) << std::endl;
+ }
+}
+
+extern "C" int getprop_main(int argc, char** argv) {
+ bool print_property_context = false;
+
+ while (true) {
+ static const struct option long_options[] = {
+ {"help", no_argument, nullptr, 'h'},
+ {nullptr, 0, nullptr, 0},
+ };
+
+ int arg = getopt_long(argc, argv, "Z", long_options, nullptr);
+
+ if (arg == -1) {
+ break;
+ }
+
+ switch (arg) {
+ case 'h':
+ std::cout << "usage: getprop [-Z] [NAME [DEFAULT]]\n\n"
+ "Gets an Android system property, or lists them all.\n"
+ "Use -Z to return the property context instead of the property value\n"
+ << std::endl;
+ return 0;
+ case 'Z':
+ print_property_context = true;
+ break;
+ case '?':
+ return -1;
+ default:
+ std::cerr << "getprop: getopt returned invalid result: " << arg << std::endl;
+ return -1;
+ }
+ }
+
+ if (print_property_context) {
+ property_info_file.LoadDefaultPath();
+ if (!property_info_file) {
+ std::cerr << "Unable to load property info file" << std::endl;
+ return -1;
+ }
+ }
+
+ if (optind >= argc) {
+ PrintAllProperties(print_property_context);
+ return 0;
+ }
+
+ if (optind < argc - 2) {
+ std::cerr << "getprop: Max 2 arguments (see \"getprop --help\")" << std::endl;
+ return -1;
+ }
+
+ PrintProperty(argv[optind], (optind == argc - 1) ? "" : argv[optind + 1],
+ print_property_context);
+
+ return 0;
+}