init: introduce Result<T> for return values and error handling
init tries to propagate error information up to build context before logging errors. This is a good thing, however too often init has the overly verbose paradigm for error handling, below: bool CalculateResult(const T& input, U* output, std::string* err) bool CalculateAndUseResult(const T& input, std::string* err) { U output; std::string calculate_result_err; if (!CalculateResult(input, &output, &calculate_result_err)) { *err = "CalculateResult " + input + " failed: " + calculate_result_err; return false; } UseResult(output); return true; } Even more common are functions that return only true/false but also require passing a std::string* err in order to see the error message. This change introduces a Result<T> that is use to either hold a successful return value of type T or to hold an error message as a std::string. If the functional only returns success or a failure with an error message, Result<Success> may be used. The classes Error and ErrnoError are used to indicate a failed Result<T>. A successful Result<T> is constructed implicitly from any type that can be implicitly converted to T or from the constructor arguments for T. This allows you to return a type T directly from a function that returns Result<T>. Error and ErrnoError are used to construct a Result<T> has failed. Each of these classes take an ostream as an input and are implicitly cast to a Result<T> containing that failure. ErrnoError() additionally appends ": " + strerror(errno) to the end of the failure string to aid in interacting with C APIs. The end result is that the above code snippet is turned into the much clearer example below: Result<U> CalculateResult(const T& input); Result<Success> CalculateAndUseResult(const T& input) { auto output = CalculateResult(input); if (!output) { return Error() << "CalculateResult " << input << " failed: " << output.error(); } UseResult(*output); return Success(); } This change also makes this conversion for some of the util.cpp functions that used the old paradigm. Test: boot bullhead, init unit tests Merged-In: I1e7d3a8820a79362245041251057fbeed2f7979b Change-Id: I1e7d3a8820a79362245041251057fbeed2f7979b
This commit is contained in:
parent
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11a3aeeae3
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@ -159,6 +159,7 @@ cc_test {
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"devices_test.cpp",
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"init_test.cpp",
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"property_service_test.cpp",
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"result_test.cpp",
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"service_test.cpp",
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"ueventd_test.cpp",
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"util_test.cpp",
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@ -151,9 +151,8 @@ static int do_class_restart(const std::vector<std::string>& args) {
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}
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static int do_domainname(const std::vector<std::string>& args) {
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std::string err;
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if (!WriteFile("/proc/sys/kernel/domainname", args[1], &err)) {
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LOG(ERROR) << err;
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if (auto result = WriteFile("/proc/sys/kernel/domainname", args[1]); !result) {
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LOG(ERROR) << "Unable to write to /proc/sys/kernel/domainname: " << result.error();
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return -1;
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}
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return 0;
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@ -199,9 +198,8 @@ static int do_export(const std::vector<std::string>& args) {
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}
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static int do_hostname(const std::vector<std::string>& args) {
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std::string err;
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if (!WriteFile("/proc/sys/kernel/hostname", args[1], &err)) {
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LOG(ERROR) << err;
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if (auto result = WriteFile("/proc/sys/kernel/hostname", args[1]); !result) {
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LOG(ERROR) << "Unable to write to /proc/sys/kernel/hostname: " << result.error();
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return -1;
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}
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return 0;
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@ -244,22 +242,22 @@ static int do_mkdir(const std::vector<std::string>& args) {
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}
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if (args.size() >= 4) {
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uid_t uid;
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std::string decode_uid_err;
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if (!DecodeUid(args[3], &uid, &decode_uid_err)) {
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LOG(ERROR) << "Unable to find UID for '" << args[3] << "': " << decode_uid_err;
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auto uid = DecodeUid(args[3]);
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if (!uid) {
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LOG(ERROR) << "Unable to decode UID for '" << args[3] << "': " << uid.error();
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return -1;
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}
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gid_t gid = -1;
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Result<gid_t> gid = -1;
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if (args.size() == 5) {
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if (!DecodeUid(args[4], &gid, &decode_uid_err)) {
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LOG(ERROR) << "Unable to find GID for '" << args[3] << "': " << decode_uid_err;
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gid = DecodeUid(args[4]);
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if (!gid) {
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LOG(ERROR) << "Unable to decode GID for '" << args[3] << "': " << gid.error();
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return -1;
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}
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}
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if (lchown(args[1].c_str(), uid, gid) == -1) {
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if (lchown(args[1].c_str(), *uid, *gid) == -1) {
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return -errno;
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}
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@ -651,9 +649,8 @@ static int do_verity_update_state(const std::vector<std::string>& args) {
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}
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static int do_write(const std::vector<std::string>& args) {
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std::string err;
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if (!WriteFile(args[1], args[2], &err)) {
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LOG(ERROR) << err;
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if (auto result = WriteFile(args[1], args[2]); !result) {
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LOG(ERROR) << "Unable to write to file '" << args[1] << "': " << result.error();
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return -1;
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}
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return 0;
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@ -720,39 +717,38 @@ static int do_readahead(const std::vector<std::string>& args) {
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}
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static int do_copy(const std::vector<std::string>& args) {
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std::string data;
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std::string err;
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if (!ReadFile(args[1], &data, &err)) {
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LOG(ERROR) << err;
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auto file_contents = ReadFile(args[1]);
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if (!file_contents) {
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LOG(ERROR) << "Could not read input file '" << args[1] << "': " << file_contents.error();
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return -1;
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}
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if (!WriteFile(args[2], data, &err)) {
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LOG(ERROR) << err;
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if (auto result = WriteFile(args[2], *file_contents); !result) {
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LOG(ERROR) << "Could not write to output file '" << args[2] << "': " << result.error();
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return -1;
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}
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return 0;
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}
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static int do_chown(const std::vector<std::string>& args) {
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uid_t uid;
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std::string decode_uid_err;
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if (!DecodeUid(args[1], &uid, &decode_uid_err)) {
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LOG(ERROR) << "Unable to find UID for '" << args[1] << "': " << decode_uid_err;
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auto uid = DecodeUid(args[1]);
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if (!uid) {
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LOG(ERROR) << "Unable to decode UID for '" << args[1] << "': " << uid.error();
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return -1;
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}
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// GID is optional and pushes the index of path out by one if specified.
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const std::string& path = (args.size() == 4) ? args[3] : args[2];
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gid_t gid = -1;
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Result<gid_t> gid = -1;
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if (args.size() == 4) {
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if (!DecodeUid(args[2], &gid, &decode_uid_err)) {
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LOG(ERROR) << "Unable to find GID for '" << args[2] << "': " << decode_uid_err;
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gid = DecodeUid(args[2]);
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if (!gid) {
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LOG(ERROR) << "Unable to decode GID for '" << args[2] << "': " << gid.error();
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return -1;
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}
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}
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if (lchown(path.c_str(), uid, gid) == -1) return -errno;
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if (lchown(path.c_str(), *uid, *gid) == -1) return -errno;
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return 0;
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}
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@ -156,10 +156,9 @@ TEST(init, EventTriggerOrderMultipleFiles) {
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"execute 3";
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// clang-format on
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// WriteFile() ensures the right mode is set
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std::string err;
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ASSERT_TRUE(WriteFile(std::string(dir.path) + "/a.rc", dir_a_script, &err));
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ASSERT_TRUE(WriteFile(std::string(dir.path) + "/a.rc", dir_a_script));
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ASSERT_TRUE(WriteFile(std::string(dir.path) + "/b.rc", "on boot\nexecute 5", &err));
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ASSERT_TRUE(WriteFile(std::string(dir.path) + "/b.rc", "on boot\nexecute 5"));
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// clang-format off
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std::string start_script = "import " + std::string(first_import.path) + "\n"
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@ -102,15 +102,14 @@ void Parser::ParseData(const std::string& filename, const std::string& data) {
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bool Parser::ParseConfigFile(const std::string& path) {
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LOG(INFO) << "Parsing file " << path << "...";
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android::base::Timer t;
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std::string data;
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std::string err;
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if (!ReadFile(path, &data, &err)) {
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LOG(ERROR) << err;
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auto config_contents = ReadFile(path);
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if (!config_contents) {
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LOG(ERROR) << "Unable to read config file '" << path << "': " << config_contents.error();
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return false;
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}
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data.push_back('\n'); // TODO: fix parse_config.
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ParseData(path, data);
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config_contents->push_back('\n'); // TODO: fix parse_config.
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ParseData(path, *config_contents);
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for (const auto& [section_name, section_parser] : section_parsers_) {
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section_parser->EndFile();
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}
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@ -588,14 +588,14 @@ static void load_properties(char *data, const char *filter)
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// "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match.
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static void load_properties_from_file(const char* filename, const char* filter) {
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Timer t;
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std::string data;
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std::string err;
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if (!ReadFile(filename, &data, &err)) {
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PLOG(WARNING) << "Couldn't load property file: " << err;
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auto file_contents = ReadFile(filename);
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if (!file_contents) {
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PLOG(WARNING) << "Couldn't load property file '" << filename
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<< "': " << file_contents.error();
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return;
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}
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data.push_back('\n');
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load_properties(&data[0], filter);
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file_contents->push_back('\n');
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load_properties(file_contents->data(), filter);
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LOG(VERBOSE) << "(Loading properties from " << filename << " took " << t << ".)";
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}
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@ -0,0 +1,142 @@
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This file contains classes for returning a successful result along with an optional
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// arbitrarily typed return value or for returning a failure result along with an optional string
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// indicating why the function failed.
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// There are 3 classes that implement this functionality and one additional helper type.
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//
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// Result<T> either contains a member of type T that can be accessed using similar semantics as
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// std::optional<T> or it contains a std::string describing an error, which can be accessed via
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// Result<T>::error().
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//
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// Success is a typedef that aids in creating Result<T> that do not contain a return value.
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// Result<Success> is the correct return type for a function that either returns successfully or
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// returns an error value. Returning Success() from a function that returns Result<Success> is the
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// correct way to indicate that a function without a return type has completed successfully.
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//
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// A successful Result<T> is constructed implicitly from any type that can be implicitly converted
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// to T or from the constructor arguments for T. This allows you to return a type T directly from
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// a function that returns Result<T>.
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//
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// Error and ErrnoError are used to construct a Result<T> that has failed. Each of these classes
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// take an ostream as an input and are implicitly cast to a Result<T> containing that failure.
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// ErrnoError() additionally appends ": " + strerror(errno) to the end of the failure string to aid
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// in interacting with C APIs.
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// An example of how to use these is below:
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// Result<U> CalculateResult(const T& input) {
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// U output;
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// if (!SomeOtherCppFunction(input, &output)) {
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// return Error() << "SomeOtherCppFunction(" << input << ") failed";
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// }
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// if (!c_api_function(output)) {
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// return ErrnoError() << "c_api_function(" << output << ") failed";
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// }
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// return output;
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// }
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//
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// auto output = CalculateResult(input);
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// if (!output) return Error() << "CalculateResult failed: " << output.error();
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// UseOutput(*output);
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#ifndef _INIT_RESULT_H
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#define _INIT_RESULT_H
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#include <errno.h>
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#include <sstream>
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#include <string>
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#include <variant>
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namespace android {
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namespace init {
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class Error {
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public:
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Error() : append_errno_(0) {}
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template <typename T>
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Error&& operator<<(T&& t) {
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ss_ << std::forward<T>(t);
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return std::move(*this);
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}
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const std::string str() const {
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if (append_errno_) {
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return ss_.str() + ": " + strerror(append_errno_);
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}
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return ss_.str();
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}
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Error(const Error&) = delete;
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Error(Error&&) = delete;
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Error& operator=(const Error&) = delete;
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Error& operator=(Error&&) = delete;
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protected:
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Error(int append_errno) : append_errno_(append_errno) {}
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private:
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std::stringstream ss_;
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int append_errno_;
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};
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class ErrnoError : public Error {
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public:
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ErrnoError() : Error(errno) {}
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};
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template <typename T>
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class Result {
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public:
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template <typename... U>
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Result(U&&... result) : contents_(std::in_place_index_t<0>(), std::forward<U>(result)...) {}
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Result(Error&& fb) : contents_(std::in_place_index_t<1>(), fb.str()) {}
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bool has_value() const { return contents_.index() == 0; }
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T& value() & { return std::get<0>(contents_); }
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const T& value() const & { return std::get<0>(contents_); }
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T&& value() && { return std::get<0>(std::move(contents_)); }
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const T&& value() const && { return std::get<0>(std::move(contents_)); }
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const std::string& error() const & { return std::get<1>(contents_); }
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std::string&& error() && { return std::get<1>(std::move(contents_)); }
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const std::string&& error() const && { return std::get<1>(std::move(contents_)); }
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explicit operator bool() const { return has_value(); }
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T& operator*() & { return value(); }
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const T& operator*() const & { return value(); }
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T&& operator*() && { return std::move(value()); }
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const T&& operator*() const && { return std::move(value()); }
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T* operator->() { return &value(); }
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const T* operator->() const { return &value(); }
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private:
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std::variant<T, std::string> contents_;
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};
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using Success = std::monostate;
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} // namespace init
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} // namespace android
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#endif
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@ -0,0 +1,222 @@
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
|
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* You may obtain a copy of the License at
|
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*
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* http://www.apache.org/licenses/LICENSE-2.0
|
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*
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* Unless required by applicable law or agreed to in writing, software
|
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* distributed under the License is distributed on an "AS IS" BASIS,
|
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
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* limitations under the License.
|
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*/
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#include "result.h"
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#include "errno.h"
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#include <string>
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#include <gtest/gtest.h>
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using namespace std::string_literals;
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namespace android {
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namespace init {
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TEST(result, result_accessors) {
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Result<std::string> result = "success";
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ASSERT_TRUE(result);
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ASSERT_TRUE(result.has_value());
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EXPECT_EQ("success", *result);
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EXPECT_EQ("success", result.value());
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EXPECT_EQ('s', result->data()[0]);
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}
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TEST(result, result_accessors_rvalue) {
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ASSERT_TRUE(Result<std::string>("success"));
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ASSERT_TRUE(Result<std::string>("success").has_value());
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EXPECT_EQ("success", *Result<std::string>("success"));
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EXPECT_EQ("success", Result<std::string>("success").value());
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EXPECT_EQ('s', Result<std::string>("success")->data()[0]);
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}
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TEST(result, result_success) {
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Result<Success> result = Success();
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ASSERT_TRUE(result);
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ASSERT_TRUE(result.has_value());
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EXPECT_EQ(Success(), *result);
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EXPECT_EQ(Success(), result.value());
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}
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TEST(result, result_success_rvalue) {
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// Success() doesn't actually create a Result<Success> object, but rather an object that can be
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// implicitly constructed into a Result<Success> object.
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auto MakeRvalueSuccessResult = []() -> Result<Success> { return Success(); };
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ASSERT_TRUE(MakeRvalueSuccessResult());
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ASSERT_TRUE(MakeRvalueSuccessResult().has_value());
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EXPECT_EQ(Success(), *MakeRvalueSuccessResult());
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EXPECT_EQ(Success(), MakeRvalueSuccessResult().value());
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}
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TEST(result, result_error) {
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Result<Success> result = Error() << "failure" << 1;
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ASSERT_FALSE(result);
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ASSERT_FALSE(result.has_value());
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EXPECT_EQ("failure1", result.error());
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}
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TEST(result, result_error_empty) {
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Result<Success> result = Error();
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ASSERT_FALSE(result);
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ASSERT_FALSE(result.has_value());
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EXPECT_EQ("", result.error());
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}
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TEST(result, result_error_rvalue) {
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// Error() and ErrnoError() aren't actually used to create a Result<T> object.
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// Under the hood, they are an intermediate class that can be implicitly constructed into a
|
||||
// Result<T>. This is needed both to create the ostream and because Error() itself, by
|
||||
// definition will not know what the type, T, of the underlying Result<T> object that it would
|
||||
// create is.
|
||||
|
||||
auto MakeRvalueErrorResult = []() -> Result<Success> { return Error() << "failure" << 1; };
|
||||
ASSERT_FALSE(MakeRvalueErrorResult());
|
||||
ASSERT_FALSE(MakeRvalueErrorResult().has_value());
|
||||
|
||||
EXPECT_EQ("failure1", MakeRvalueErrorResult().error());
|
||||
}
|
||||
|
||||
TEST(result, result_errno_error) {
|
||||
constexpr int test_errno = 6;
|
||||
errno = test_errno;
|
||||
Result<Success> result = ErrnoError() << "failure" << 1;
|
||||
|
||||
ASSERT_FALSE(result);
|
||||
ASSERT_FALSE(result.has_value());
|
||||
|
||||
EXPECT_EQ("failure1: "s + strerror(test_errno), result.error());
|
||||
}
|
||||
|
||||
TEST(result, constructor_forwarding) {
|
||||
auto result = Result<std::string>(5, 'a');
|
||||
|
||||
ASSERT_TRUE(result);
|
||||
ASSERT_TRUE(result.has_value());
|
||||
|
||||
EXPECT_EQ("aaaaa", *result);
|
||||
}
|
||||
|
||||
struct ConstructorTracker {
|
||||
static size_t constructor_called;
|
||||
static size_t copy_constructor_called;
|
||||
static size_t move_constructor_called;
|
||||
static size_t copy_assignment_called;
|
||||
static size_t move_assignment_called;
|
||||
|
||||
template <typename T>
|
||||
ConstructorTracker(T&& string) : string(string) {
|
||||
++constructor_called;
|
||||
}
|
||||
|
||||
ConstructorTracker(const ConstructorTracker& ct) {
|
||||
++copy_constructor_called;
|
||||
string = ct.string;
|
||||
}
|
||||
ConstructorTracker(ConstructorTracker&& ct) noexcept {
|
||||
++move_constructor_called;
|
||||
string = std::move(ct.string);
|
||||
}
|
||||
ConstructorTracker& operator=(const ConstructorTracker& ct) {
|
||||
++copy_assignment_called;
|
||||
string = ct.string;
|
||||
return *this;
|
||||
}
|
||||
ConstructorTracker& operator=(ConstructorTracker&& ct) noexcept {
|
||||
++move_assignment_called;
|
||||
string = std::move(ct.string);
|
||||
return *this;
|
||||
}
|
||||
|
||||
std::string string;
|
||||
};
|
||||
|
||||
size_t ConstructorTracker::constructor_called = 0;
|
||||
size_t ConstructorTracker::copy_constructor_called = 0;
|
||||
size_t ConstructorTracker::move_constructor_called = 0;
|
||||
size_t ConstructorTracker::copy_assignment_called = 0;
|
||||
size_t ConstructorTracker::move_assignment_called = 0;
|
||||
|
||||
Result<ConstructorTracker> ReturnConstructorTracker(const std::string& in) {
|
||||
if (in.empty()) {
|
||||
return "literal string";
|
||||
}
|
||||
if (in == "test2") {
|
||||
return ConstructorTracker(in + in + "2");
|
||||
}
|
||||
ConstructorTracker result(in + " " + in);
|
||||
return result;
|
||||
};
|
||||
|
||||
TEST(result, no_copy_on_return) {
|
||||
// If returning parameters that may be used to implicitly construct the type T of Result<T>,
|
||||
// then those parameters are forwarded to the construction of Result<T>.
|
||||
|
||||
// If returning an prvalue or xvalue, it will be move constructed during the construction of
|
||||
// Result<T>.
|
||||
|
||||
// This check ensures that that is the case, and particularly that no copy constructors
|
||||
// are called.
|
||||
|
||||
auto result1 = ReturnConstructorTracker("");
|
||||
ASSERT_TRUE(result1);
|
||||
EXPECT_EQ("literal string", result1->string);
|
||||
EXPECT_EQ(1U, ConstructorTracker::constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::move_constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_assignment_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::move_assignment_called);
|
||||
|
||||
auto result2 = ReturnConstructorTracker("test2");
|
||||
ASSERT_TRUE(result2);
|
||||
EXPECT_EQ("test2test22", result2->string);
|
||||
EXPECT_EQ(2U, ConstructorTracker::constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_constructor_called);
|
||||
EXPECT_EQ(1U, ConstructorTracker::move_constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_assignment_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::move_assignment_called);
|
||||
|
||||
auto result3 = ReturnConstructorTracker("test3");
|
||||
ASSERT_TRUE(result3);
|
||||
EXPECT_EQ("test3 test3", result3->string);
|
||||
EXPECT_EQ(3U, ConstructorTracker::constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_constructor_called);
|
||||
EXPECT_EQ(2U, ConstructorTracker::move_constructor_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::copy_assignment_called);
|
||||
EXPECT_EQ(0U, ConstructorTracker::move_assignment_called);
|
||||
}
|
||||
|
||||
TEST(result, die_on_access_failed_result) {
|
||||
Result<std::string> result = Error();
|
||||
ASSERT_DEATH(*result, "");
|
||||
}
|
||||
|
||||
TEST(result, die_on_get_error_succesful_result) {
|
||||
Result<std::string> result = "success";
|
||||
ASSERT_DEATH(result.error(), "");
|
||||
}
|
||||
|
||||
} // namespace init
|
||||
} // namespace android
|
|
@ -339,9 +339,8 @@ void SelinuxInitialize() {
|
|||
}
|
||||
}
|
||||
|
||||
std::string err;
|
||||
if (!WriteFile("/sys/fs/selinux/checkreqprot", "0", &err)) {
|
||||
LOG(ERROR) << err;
|
||||
if (auto result = WriteFile("/sys/fs/selinux/checkreqprot", "0"); !result) {
|
||||
LOG(ERROR) << "Unable to write to /sys/fs/selinux/checkreqprot: " << result.error();
|
||||
panic();
|
||||
}
|
||||
|
||||
|
|
|
@ -386,18 +386,20 @@ bool Service::ParseDisabled(const std::vector<std::string>& args, std::string* e
|
|||
}
|
||||
|
||||
bool Service::ParseGroup(const std::vector<std::string>& args, std::string* err) {
|
||||
std::string decode_uid_err;
|
||||
if (!DecodeUid(args[1], &gid_, &decode_uid_err)) {
|
||||
*err = "Unable to find GID for '" + args[1] + "': " + decode_uid_err;
|
||||
auto gid = DecodeUid(args[1]);
|
||||
if (!gid) {
|
||||
*err = "Unable to decode GID for '" + args[1] + "': " + gid.error();
|
||||
return false;
|
||||
}
|
||||
gid_ = *gid;
|
||||
|
||||
for (std::size_t n = 2; n < args.size(); n++) {
|
||||
gid_t gid;
|
||||
if (!DecodeUid(args[n], &gid, &decode_uid_err)) {
|
||||
*err = "Unable to find GID for '" + args[n] + "': " + decode_uid_err;
|
||||
gid = DecodeUid(args[n]);
|
||||
if (!gid) {
|
||||
*err = "Unable to decode GID for '" + args[n] + "': " + gid.error();
|
||||
return false;
|
||||
}
|
||||
supp_gids_.emplace_back(gid);
|
||||
supp_gids_.emplace_back(*gid);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
@ -527,26 +529,27 @@ bool Service::ParseShutdown(const std::vector<std::string>& args, std::string* e
|
|||
template <typename T>
|
||||
bool Service::AddDescriptor(const std::vector<std::string>& args, std::string* err) {
|
||||
int perm = args.size() > 3 ? std::strtoul(args[3].c_str(), 0, 8) : -1;
|
||||
uid_t uid = 0;
|
||||
gid_t gid = 0;
|
||||
Result<uid_t> uid = 0;
|
||||
Result<gid_t> gid = 0;
|
||||
std::string context = args.size() > 6 ? args[6] : "";
|
||||
|
||||
std::string decode_uid_err;
|
||||
if (args.size() > 4) {
|
||||
if (!DecodeUid(args[4], &uid, &decode_uid_err)) {
|
||||
*err = "Unable to find UID for '" + args[4] + "': " + decode_uid_err;
|
||||
uid = DecodeUid(args[4]);
|
||||
if (!uid) {
|
||||
*err = "Unable to find UID for '" + args[4] + "': " + uid.error();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
if (args.size() > 5) {
|
||||
if (!DecodeUid(args[5], &gid, &decode_uid_err)) {
|
||||
*err = "Unable to find GID for '" + args[5] + "': " + decode_uid_err;
|
||||
gid = DecodeUid(args[5]);
|
||||
if (!gid) {
|
||||
*err = "Unable to find GID for '" + args[5] + "': " + gid.error();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
auto descriptor = std::make_unique<T>(args[1], args[2], uid, gid, perm, context);
|
||||
auto descriptor = std::make_unique<T>(args[1], args[2], *uid, *gid, perm, context);
|
||||
|
||||
auto old =
|
||||
std::find_if(descriptors_.begin(), descriptors_.end(),
|
||||
|
@ -585,11 +588,12 @@ bool Service::ParseFile(const std::vector<std::string>& args, std::string* err)
|
|||
}
|
||||
|
||||
bool Service::ParseUser(const std::vector<std::string>& args, std::string* err) {
|
||||
std::string decode_uid_err;
|
||||
if (!DecodeUid(args[1], &uid_, &decode_uid_err)) {
|
||||
*err = "Unable to find UID for '" + args[1] + "': " + decode_uid_err;
|
||||
auto uid = DecodeUid(args[1]);
|
||||
if (!uid) {
|
||||
*err = "Unable to find UID for '" + args[1] + "': " + uid.error();
|
||||
return false;
|
||||
}
|
||||
uid_ = *uid;
|
||||
return true;
|
||||
}
|
||||
|
||||
|
@ -979,34 +983,35 @@ std::unique_ptr<Service> Service::MakeTemporaryOneshotService(const std::vector<
|
|||
if (command_arg > 2 && args[1] != "-") {
|
||||
seclabel = args[1];
|
||||
}
|
||||
uid_t uid = 0;
|
||||
Result<uid_t> uid = 0;
|
||||
if (command_arg > 3) {
|
||||
std::string decode_uid_err;
|
||||
if (!DecodeUid(args[2], &uid, &decode_uid_err)) {
|
||||
LOG(ERROR) << "Unable to find UID for '" << args[2] << "': " << decode_uid_err;
|
||||
uid = DecodeUid(args[2]);
|
||||
if (!uid) {
|
||||
LOG(ERROR) << "Unable to decode UID for '" << args[2] << "': " << uid.error();
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
gid_t gid = 0;
|
||||
Result<gid_t> gid = 0;
|
||||
std::vector<gid_t> supp_gids;
|
||||
if (command_arg > 4) {
|
||||
std::string decode_uid_err;
|
||||
if (!DecodeUid(args[3], &gid, &decode_uid_err)) {
|
||||
LOG(ERROR) << "Unable to find GID for '" << args[3] << "': " << decode_uid_err;
|
||||
gid = DecodeUid(args[3]);
|
||||
if (!gid) {
|
||||
LOG(ERROR) << "Unable to decode GID for '" << args[3] << "': " << gid.error();
|
||||
return nullptr;
|
||||
}
|
||||
std::size_t nr_supp_gids = command_arg - 1 /* -- */ - 4 /* exec SECLABEL UID GID */;
|
||||
for (size_t i = 0; i < nr_supp_gids; ++i) {
|
||||
gid_t supp_gid;
|
||||
if (!DecodeUid(args[4 + i], &supp_gid, &decode_uid_err)) {
|
||||
LOG(ERROR) << "Unable to find UID for '" << args[4 + i] << "': " << decode_uid_err;
|
||||
auto supp_gid = DecodeUid(args[4 + i]);
|
||||
if (!supp_gid) {
|
||||
LOG(ERROR) << "Unable to decode GID for '" << args[4 + i]
|
||||
<< "': " << supp_gid.error();
|
||||
return nullptr;
|
||||
}
|
||||
supp_gids.push_back(supp_gid);
|
||||
supp_gids.push_back(*supp_gid);
|
||||
}
|
||||
}
|
||||
|
||||
return std::make_unique<Service>(name, flags, uid, gid, supp_gids, no_capabilities,
|
||||
return std::make_unique<Service>(name, flags, *uid, *gid, supp_gids, no_capabilities,
|
||||
namespace_flags, seclabel, str_args);
|
||||
}
|
||||
|
||||
|
|
|
@ -132,29 +132,29 @@ static void Test_make_temporary_oneshot_service(bool dash_dash, bool seclabel, b
|
|||
ASSERT_EQ("", svc->seclabel());
|
||||
}
|
||||
if (uid) {
|
||||
uid_t decoded_uid;
|
||||
std::string err;
|
||||
ASSERT_TRUE(DecodeUid("log", &decoded_uid, &err));
|
||||
ASSERT_EQ(decoded_uid, svc->uid());
|
||||
auto decoded_uid = DecodeUid("log");
|
||||
ASSERT_TRUE(decoded_uid);
|
||||
ASSERT_EQ(*decoded_uid, svc->uid());
|
||||
} else {
|
||||
ASSERT_EQ(0U, svc->uid());
|
||||
}
|
||||
if (gid) {
|
||||
uid_t decoded_uid;
|
||||
std::string err;
|
||||
ASSERT_TRUE(DecodeUid("shell", &decoded_uid, &err));
|
||||
ASSERT_EQ(decoded_uid, svc->gid());
|
||||
auto decoded_uid = DecodeUid("shell");
|
||||
ASSERT_TRUE(decoded_uid);
|
||||
ASSERT_EQ(*decoded_uid, svc->gid());
|
||||
} else {
|
||||
ASSERT_EQ(0U, svc->gid());
|
||||
}
|
||||
if (supplementary_gids) {
|
||||
ASSERT_EQ(2U, svc->supp_gids().size());
|
||||
uid_t decoded_uid;
|
||||
std::string err;
|
||||
ASSERT_TRUE(DecodeUid("system", &decoded_uid, &err));
|
||||
ASSERT_EQ(decoded_uid, svc->supp_gids()[0]);
|
||||
ASSERT_TRUE(DecodeUid("adb", &decoded_uid, &err));
|
||||
ASSERT_EQ(decoded_uid, svc->supp_gids()[1]);
|
||||
|
||||
auto decoded_uid = DecodeUid("system");
|
||||
ASSERT_TRUE(decoded_uid);
|
||||
ASSERT_EQ(*decoded_uid, svc->supp_gids()[0]);
|
||||
|
||||
decoded_uid = DecodeUid("adb");
|
||||
ASSERT_TRUE(decoded_uid);
|
||||
ASSERT_EQ(*decoded_uid, svc->supp_gids()[1]);
|
||||
} else {
|
||||
ASSERT_EQ(0U, svc->supp_gids().size());
|
||||
}
|
||||
|
|
|
@ -57,30 +57,20 @@ namespace init {
|
|||
const std::string kDefaultAndroidDtDir("/proc/device-tree/firmware/android/");
|
||||
|
||||
// DecodeUid() - decodes and returns the given string, which can be either the
|
||||
// numeric or name representation, into the integer uid or gid. Returns
|
||||
// UINT_MAX on error.
|
||||
bool DecodeUid(const std::string& name, uid_t* uid, std::string* err) {
|
||||
*uid = UINT_MAX;
|
||||
*err = "";
|
||||
|
||||
// numeric or name representation, into the integer uid or gid.
|
||||
Result<uid_t> DecodeUid(const std::string& name) {
|
||||
if (isalpha(name[0])) {
|
||||
passwd* pwd = getpwnam(name.c_str());
|
||||
if (!pwd) {
|
||||
*err = "getpwnam failed: "s + strerror(errno);
|
||||
return false;
|
||||
}
|
||||
*uid = pwd->pw_uid;
|
||||
return true;
|
||||
if (!pwd) return ErrnoError() << "getpwnam failed";
|
||||
|
||||
return pwd->pw_uid;
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
uid_t result = static_cast<uid_t>(strtoul(name.c_str(), 0, 0));
|
||||
if (errno) {
|
||||
*err = "strtoul failed: "s + strerror(errno);
|
||||
return false;
|
||||
}
|
||||
*uid = result;
|
||||
return true;
|
||||
if (errno) return ErrnoError() << "strtoul failed";
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -164,50 +154,40 @@ out_unlink:
|
|||
return -1;
|
||||
}
|
||||
|
||||
bool ReadFile(const std::string& path, std::string* content, std::string* err) {
|
||||
content->clear();
|
||||
*err = "";
|
||||
|
||||
Result<std::string> ReadFile(const std::string& path) {
|
||||
android::base::unique_fd fd(
|
||||
TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC)));
|
||||
if (fd == -1) {
|
||||
*err = "Unable to open '" + path + "': " + strerror(errno);
|
||||
return false;
|
||||
return ErrnoError() << "open() failed";
|
||||
}
|
||||
|
||||
// For security reasons, disallow world-writable
|
||||
// or group-writable files.
|
||||
struct stat sb;
|
||||
if (fstat(fd, &sb) == -1) {
|
||||
*err = "fstat failed for '" + path + "': " + strerror(errno);
|
||||
return false;
|
||||
return ErrnoError() << "fstat failed()";
|
||||
}
|
||||
if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0) {
|
||||
*err = "Skipping insecure file '" + path + "'";
|
||||
return false;
|
||||
return Error() << "Skipping insecure file";
|
||||
}
|
||||
|
||||
if (!android::base::ReadFdToString(fd, content)) {
|
||||
*err = "Unable to read '" + path + "': " + strerror(errno);
|
||||
return false;
|
||||
std::string content;
|
||||
if (!android::base::ReadFdToString(fd, &content)) {
|
||||
return ErrnoError() << "Unable to read file contents";
|
||||
}
|
||||
return true;
|
||||
return content;
|
||||
}
|
||||
|
||||
bool WriteFile(const std::string& path, const std::string& content, std::string* err) {
|
||||
*err = "";
|
||||
|
||||
Result<Success> WriteFile(const std::string& path, const std::string& content) {
|
||||
android::base::unique_fd fd(TEMP_FAILURE_RETRY(
|
||||
open(path.c_str(), O_WRONLY | O_CREAT | O_NOFOLLOW | O_TRUNC | O_CLOEXEC, 0600)));
|
||||
if (fd == -1) {
|
||||
*err = "Unable to open '" + path + "': " + strerror(errno);
|
||||
return false;
|
||||
return ErrnoError() << "open() failed";
|
||||
}
|
||||
if (!android::base::WriteStringToFd(content, fd)) {
|
||||
*err = "Unable to write to '" + path + "': " + strerror(errno);
|
||||
return false;
|
||||
return ErrnoError() << "Unable to write file contents";
|
||||
}
|
||||
return true;
|
||||
return Success();
|
||||
}
|
||||
|
||||
bool mkdir_recursive(const std::string& path, mode_t mode) {
|
||||
|
|
|
@ -28,6 +28,8 @@
|
|||
#include <android-base/chrono_utils.h>
|
||||
#include <selinux/label.h>
|
||||
|
||||
#include "result.h"
|
||||
|
||||
#define COLDBOOT_DONE "/dev/.coldboot_done"
|
||||
|
||||
using android::base::boot_clock;
|
||||
|
@ -39,10 +41,10 @@ namespace init {
|
|||
int CreateSocket(const char* name, int type, bool passcred, mode_t perm, uid_t uid, gid_t gid,
|
||||
const char* socketcon);
|
||||
|
||||
bool ReadFile(const std::string& path, std::string* content, std::string* err);
|
||||
bool WriteFile(const std::string& path, const std::string& content, std::string* err);
|
||||
Result<std::string> ReadFile(const std::string& path);
|
||||
Result<Success> WriteFile(const std::string& path, const std::string& content);
|
||||
|
||||
bool DecodeUid(const std::string& name, uid_t* uid, std::string* err);
|
||||
Result<uid_t> DecodeUid(const std::string& name);
|
||||
|
||||
bool mkdir_recursive(const std::string& pathname, mode_t mode);
|
||||
int wait_for_file(const char *filename, std::chrono::nanoseconds timeout);
|
||||
|
|
|
@ -30,61 +30,51 @@ namespace android {
|
|||
namespace init {
|
||||
|
||||
TEST(util, ReadFile_ENOENT) {
|
||||
std::string s("hello");
|
||||
std::string err;
|
||||
errno = 0;
|
||||
EXPECT_FALSE(ReadFile("/proc/does-not-exist", &s, &err));
|
||||
EXPECT_EQ("Unable to open '/proc/does-not-exist': No such file or directory", err);
|
||||
auto file_contents = ReadFile("/proc/does-not-exist");
|
||||
EXPECT_EQ(ENOENT, errno);
|
||||
EXPECT_EQ("", s); // s was cleared.
|
||||
ASSERT_FALSE(file_contents);
|
||||
EXPECT_EQ("open() failed: No such file or directory", file_contents.error());
|
||||
}
|
||||
|
||||
TEST(util, ReadFileGroupWriteable) {
|
||||
std::string s("hello");
|
||||
TemporaryFile tf;
|
||||
std::string err;
|
||||
ASSERT_TRUE(tf.fd != -1);
|
||||
EXPECT_TRUE(WriteFile(tf.path, s, &err)) << strerror(errno);
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(WriteFile(tf.path, s)) << strerror(errno);
|
||||
EXPECT_NE(-1, fchmodat(AT_FDCWD, tf.path, 0620, AT_SYMLINK_NOFOLLOW)) << strerror(errno);
|
||||
EXPECT_FALSE(ReadFile(tf.path, &s, &err)) << strerror(errno);
|
||||
EXPECT_EQ("Skipping insecure file '"s + tf.path + "'", err);
|
||||
EXPECT_EQ("", s); // s was cleared.
|
||||
auto file_contents = ReadFile(tf.path);
|
||||
ASSERT_FALSE(file_contents) << strerror(errno);
|
||||
EXPECT_EQ("Skipping insecure file", file_contents.error());
|
||||
}
|
||||
|
||||
TEST(util, ReadFileWorldWiteable) {
|
||||
std::string s("hello");
|
||||
TemporaryFile tf;
|
||||
std::string err;
|
||||
ASSERT_TRUE(tf.fd != -1);
|
||||
EXPECT_TRUE(WriteFile(tf.path, s, &err)) << strerror(errno);
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(WriteFile(tf.path, s)) << strerror(errno);
|
||||
EXPECT_NE(-1, fchmodat(AT_FDCWD, tf.path, 0602, AT_SYMLINK_NOFOLLOW)) << strerror(errno);
|
||||
EXPECT_FALSE(ReadFile(tf.path, &s, &err)) << strerror(errno);
|
||||
EXPECT_EQ("Skipping insecure file '"s + tf.path + "'", err);
|
||||
EXPECT_EQ("", s); // s was cleared.
|
||||
auto file_contents = ReadFile(tf.path);
|
||||
ASSERT_FALSE(file_contents) << strerror(errno);
|
||||
EXPECT_EQ("Skipping insecure file", file_contents.error());
|
||||
}
|
||||
|
||||
TEST(util, ReadFileSymbolicLink) {
|
||||
std::string s("hello");
|
||||
errno = 0;
|
||||
// lrwxrwxrwx 1 root root 13 1970-01-01 00:00 charger -> /sbin/healthd
|
||||
std::string err;
|
||||
EXPECT_FALSE(ReadFile("/charger", &s, &err));
|
||||
EXPECT_EQ("Unable to open '/charger': Too many symbolic links encountered", err);
|
||||
auto file_contents = ReadFile("/charger");
|
||||
EXPECT_EQ(ELOOP, errno);
|
||||
EXPECT_EQ("", s); // s was cleared.
|
||||
ASSERT_FALSE(file_contents);
|
||||
EXPECT_EQ("open() failed: Too many symbolic links encountered", file_contents.error());
|
||||
}
|
||||
|
||||
TEST(util, ReadFileSuccess) {
|
||||
std::string s("hello");
|
||||
std::string err;
|
||||
EXPECT_TRUE(ReadFile("/proc/version", &s, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_GT(s.length(), 6U);
|
||||
EXPECT_EQ('\n', s[s.length() - 1]);
|
||||
s[5] = 0;
|
||||
EXPECT_STREQ("Linux", s.c_str());
|
||||
auto file_contents = ReadFile("/proc/version");
|
||||
ASSERT_TRUE(file_contents);
|
||||
EXPECT_GT(file_contents->length(), 6U);
|
||||
EXPECT_EQ('\n', file_contents->at(file_contents->length() - 1));
|
||||
(*file_contents)[5] = 0;
|
||||
EXPECT_STREQ("Linux", file_contents->c_str());
|
||||
}
|
||||
|
||||
TEST(util, WriteFileBinary) {
|
||||
|
@ -95,29 +85,23 @@ TEST(util, WriteFileBinary) {
|
|||
ASSERT_EQ(10u, contents.size());
|
||||
|
||||
TemporaryFile tf;
|
||||
std::string err;
|
||||
ASSERT_TRUE(tf.fd != -1);
|
||||
EXPECT_TRUE(WriteFile(tf.path, contents, &err)) << strerror(errno);
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(WriteFile(tf.path, contents)) << strerror(errno);
|
||||
|
||||
std::string read_back_contents;
|
||||
EXPECT_TRUE(ReadFile(tf.path, &read_back_contents, &err)) << strerror(errno);
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_EQ(contents, read_back_contents);
|
||||
EXPECT_EQ(10u, read_back_contents.size());
|
||||
auto read_back_contents = ReadFile(tf.path);
|
||||
ASSERT_TRUE(read_back_contents) << strerror(errno);
|
||||
EXPECT_EQ(contents, *read_back_contents);
|
||||
EXPECT_EQ(10u, read_back_contents->size());
|
||||
}
|
||||
|
||||
TEST(util, WriteFileNotExist) {
|
||||
std::string s("hello");
|
||||
std::string s2("hello");
|
||||
TemporaryDir test_dir;
|
||||
std::string path = android::base::StringPrintf("%s/does-not-exist", test_dir.path);
|
||||
std::string err;
|
||||
EXPECT_TRUE(WriteFile(path, s, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(ReadFile(path, &s2, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_EQ(s, s2);
|
||||
EXPECT_TRUE(WriteFile(path, s));
|
||||
auto file_contents = ReadFile(path);
|
||||
ASSERT_TRUE(file_contents);
|
||||
EXPECT_EQ(s, *file_contents);
|
||||
struct stat sb;
|
||||
int fd = open(path.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
|
||||
EXPECT_NE(-1, fd);
|
||||
|
@ -127,37 +111,30 @@ TEST(util, WriteFileNotExist) {
|
|||
}
|
||||
|
||||
TEST(util, WriteFileExist) {
|
||||
std::string s2("");
|
||||
TemporaryFile tf;
|
||||
ASSERT_TRUE(tf.fd != -1);
|
||||
std::string err;
|
||||
EXPECT_TRUE(WriteFile(tf.path, "1hello1", &err)) << strerror(errno);
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(ReadFile(tf.path, &s2, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_STREQ("1hello1", s2.c_str());
|
||||
EXPECT_TRUE(WriteFile(tf.path, "2ll2", &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_TRUE(ReadFile(tf.path, &s2, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_STREQ("2ll2", s2.c_str());
|
||||
EXPECT_TRUE(WriteFile(tf.path, "1hello1")) << strerror(errno);
|
||||
auto file_contents = ReadFile(tf.path);
|
||||
ASSERT_TRUE(file_contents);
|
||||
EXPECT_EQ("1hello1", *file_contents);
|
||||
EXPECT_TRUE(WriteFile(tf.path, "2ll2"));
|
||||
file_contents = ReadFile(tf.path);
|
||||
ASSERT_TRUE(file_contents);
|
||||
EXPECT_EQ("2ll2", *file_contents);
|
||||
}
|
||||
|
||||
TEST(util, DecodeUid) {
|
||||
uid_t decoded_uid;
|
||||
std::string err;
|
||||
auto decoded_uid = DecodeUid("root");
|
||||
EXPECT_TRUE(decoded_uid);
|
||||
EXPECT_EQ(0U, *decoded_uid);
|
||||
|
||||
EXPECT_TRUE(DecodeUid("root", &decoded_uid, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_EQ(0U, decoded_uid);
|
||||
decoded_uid = DecodeUid("toot");
|
||||
EXPECT_FALSE(decoded_uid);
|
||||
EXPECT_EQ("getpwnam failed: No such file or directory", decoded_uid.error());
|
||||
|
||||
EXPECT_FALSE(DecodeUid("toot", &decoded_uid, &err));
|
||||
EXPECT_EQ("getpwnam failed: No such file or directory", err);
|
||||
EXPECT_EQ(UINT_MAX, decoded_uid);
|
||||
|
||||
EXPECT_TRUE(DecodeUid("123", &decoded_uid, &err));
|
||||
EXPECT_EQ("", err);
|
||||
EXPECT_EQ(123U, decoded_uid);
|
||||
decoded_uid = DecodeUid("123");
|
||||
EXPECT_TRUE(decoded_uid);
|
||||
EXPECT_EQ(123U, *decoded_uid);
|
||||
}
|
||||
|
||||
TEST(util, is_dir) {
|
||||
|
|
Loading…
Reference in New Issue