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/*
* Copyright (C) 2022 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 "apex_init_util.h"
#include <dirent.h>
#include <glob.h>
#include <set>
#include <vector>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/result.h>
#include <android-base/strings.h>
#include "action_manager.h"
#include "init.h"
#include "parser.h"
#include "service_list.h"
#include "util.h"
namespace android {
namespace init {
static Result<std::vector<std::string>> CollectRcScriptsFromApex(
const std::string& apex_name, const std::set<std::string>& skip_apexes) {
glob_t glob_result;
// Pattern uses "*rc" instead of ".rc" because APEXes can have versioned RC files
// like foo.34rc.
std::string glob_pattern =
apex_name.empty() ? "/apex/*/etc/*rc" : "/apex/" + apex_name + "/etc/*rc";
const int ret = glob(glob_pattern.c_str(), GLOB_MARK, nullptr, &glob_result);
if (ret != 0 && ret != GLOB_NOMATCH) {
globfree(&glob_result);
return Error() << "Glob pattern '" << glob_pattern << "' failed";
}
std::vector<std::string> configs;
for (size_t i = 0; i < glob_result.gl_pathc; i++) {
std::string path = glob_result.gl_pathv[i];
// Filter out directories
if (path.back() == '/') {
continue;
}
// Get apex name from path.
std::vector<std::string> paths = android::base::Split(path, "/");
if (paths.size() < 3) {
continue;
}
const std::string& apex_name = paths[2];
// Filter out /apex/<name>@<ver> paths. The paths are bind-mounted to
// /apex/<name> paths, so unless we filter them out, we will parse the
// same file twice.
if (apex_name.find('@') != std::string::npos) {
continue;
}
// Filter out skip_set apexes
if (skip_apexes.count(apex_name) > 0) {
continue;
}
configs.push_back(path);
}
globfree(&glob_result);
return configs;
}
std::set<std::string> GetApexListFrom(const std::string& apex_dir) {
std::set<std::string> apex_list;
auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(apex_dir.c_str()), closedir);
if (!dirp) {
return apex_list;
}
struct dirent* entry;
while ((entry = readdir(dirp.get())) != nullptr) {
if (entry->d_type != DT_DIR) continue;
const char* name = entry->d_name;
if (name[0] == '.') continue;
if (strchr(name, '@') != nullptr) continue;
if (strcmp(name, "sharedlibs") == 0) continue;
apex_list.insert(name);
}
return apex_list;
}
static Result<void> ParseRcScripts(const std::vector<std::string>& files) {
if (files.empty()) {
return {};
}
// APEXes can have versioned RC files. These should be filtered based on
// SDK version.
auto filtered = FilterVersionedConfigs(
files, android::base::GetIntProperty("ro.build.version.sdk", INT_MAX));
if (filtered.empty()) {
return {};
}
Parser parser =
CreateApexConfigParser(ActionManager::GetInstance(), ServiceList::GetInstance());
std::vector<std::string> errors;
for (const auto& c : filtered) {
auto result = parser.ParseConfigFile(c);
// We should handle other config files even when there's an error.
if (!result.ok()) {
errors.push_back(result.error().message());
}
}
if (!errors.empty()) {
return Error() << "Unable to parse apex configs: " << base::Join(errors, "|");
}
return {};
}
Result<void> ParseRcScriptsFromApex(const std::string& apex_name) {
auto configs = OR_RETURN(CollectRcScriptsFromApex(apex_name, /*skip_apexes=*/{}));
return ParseRcScripts(configs);
}
Result<void> ParseRcScriptsFromAllApexes(bool bootstrap) {
std::set<std::string> skip_apexes;
if (!bootstrap) {
// In case we already loaded config files from bootstrap APEXes, we need to avoid loading
// them again. We can get the list of bootstrap APEXes by scanning /bootstrap-apex and
// skip them in CollectRcScriptsFromApex.
skip_apexes = GetApexListFrom("/bootstrap-apex");
}
auto configs = OR_RETURN(CollectRcScriptsFromApex(/*apex_name=*/"", skip_apexes));
return ParseRcScripts(configs);
}
} // namespace init
} // namespace android
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