Home | History | Annotate | Download | only in init 
      1 /*
      2  * Copyright (C) 2010 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 <dirent.h>
     18 #include <errno.h>
     19 #include <fcntl.h>
     20 
     21 #include "action.h"
     22 #include "init_parser.h"
     23 #include "log.h"
     24 #include "parser.h"
     25 #include "service.h"
     26 #include "util.h"
     27 
     28 #include <android-base/stringprintf.h>
     29 
     30 Parser::Parser() {
     31 }
     32 
     33 Parser& Parser::GetInstance() {
     34     static Parser instance;
     35     return instance;
     36 }
     37 
     38 void Parser::AddSectionParser(const std::string& name,
     39                               std::unique_ptr<SectionParser> parser) {
     40     section_parsers_[name] = std::move(parser);
     41 }
     42 
     43 void Parser::ParseData(const std::string& filename, const std::string& data) {
     44     //TODO: Use a parser with const input and remove this copy
     45     std::vector<char> data_copy(data.begin(), data.end());
     46     data_copy.push_back('\0');
     47 
     48     parse_state state;
     49     state.filename = filename.c_str();
     50     state.line = 0;
     51     state.ptr = &data_copy[0];
     52     state.nexttoken = 0;
     53 
     54     SectionParser* section_parser = nullptr;
     55     std::vector<std::string> args;
     56 
     57     for (;;) {
     58         switch (next_token(&state)) {
     59         case T_EOF:
     60             if (section_parser) {
     61                 section_parser->EndSection();
     62             }
     63             return;
     64         case T_NEWLINE:
     65             state.line++;
     66             if (args.empty()) {
     67                 break;
     68             }
     69             if (section_parsers_.count(args[0])) {
     70                 if (section_parser) {
     71                     section_parser->EndSection();
     72                 }
     73                 section_parser = section_parsers_[args[0]].get();
     74                 std::string ret_err;
     75                 if (!section_parser->ParseSection(args, &ret_err)) {
     76                     parse_error(&state, "%s\n", ret_err.c_str());
     77                     section_parser = nullptr;
     78                 }
     79             } else if (section_parser) {
     80                 std::string ret_err;
     81                 if (!section_parser->ParseLineSection(args, state.filename,
     82                                                       state.line, &ret_err)) {
     83                     parse_error(&state, "%s\n", ret_err.c_str());
     84                 }
     85             }
     86             args.clear();
     87             break;
     88         case T_TEXT:
     89             args.emplace_back(state.text);
     90             break;
     91         }
     92     }
     93 }
     94 
     95 bool Parser::ParseConfigFile(const std::string& path) {
     96     INFO("Parsing file %s...\n", path.c_str());
     97     Timer t;
     98     std::string data;
     99     if (!read_file(path.c_str(), &data)) {
    100         return false;
    101     }
    102 
    103     data.push_back('\n'); // TODO: fix parse_config.
    104     ParseData(path, data);
    105     for (const auto& sp : section_parsers_) {
    106         sp.second->EndFile(path);
    107     }
    108 
    109     // Turning this on and letting the INFO logging be discarded adds 0.2s to
    110     // Nexus 9 boot time, so it's disabled by default.
    111     if (false) DumpState();
    112 
    113     NOTICE("(Parsing %s took %.2fs.)\n", path.c_str(), t.duration());
    114     return true;
    115 }
    116 
    117 bool Parser::ParseConfigDir(const std::string& path) {
    118     INFO("Parsing directory %s...\n", path.c_str());
    119     std::unique_ptr<DIR, int(*)(DIR*)> config_dir(opendir(path.c_str()), closedir);
    120     if (!config_dir) {
    121         ERROR("Could not import directory '%s'\n", path.c_str());
    122         return false;
    123     }
    124     dirent* current_file;
    125     std::vector<std::string> files;
    126     while ((current_file = readdir(config_dir.get()))) {
    127         // Ignore directories and only process regular files.
    128         if (current_file->d_type == DT_REG) {
    129             std::string current_path =
    130                 android::base::StringPrintf("%s/%s", path.c_str(), current_file->d_name);
    131             files.emplace_back(current_path);
    132         }
    133     }
    134     // Sort first so we load files in a consistent order (bug 31996208)
    135     std::sort(files.begin(), files.end());
    136     for (const auto& file : files) {
    137         if (!ParseConfigFile(file)) {
    138             ERROR("Could not import file '%s'\n", file.c_str());
    139         }
    140     }
    141     return true;
    142 }
    143 
    144 bool Parser::ParseConfig(const std::string& path) {
    145     if (is_dir(path.c_str())) {
    146         return ParseConfigDir(path);
    147     }
    148     return ParseConfigFile(path);
    149 }
    150 
    151 void Parser::DumpState() const {
    152     ServiceManager::GetInstance().DumpState();
    153     ActionManager::GetInstance().DumpState();
    154 }
    155