1 /*
2  * Copyright (C) 2020 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 #define LOG_TAG "libapexutil"
17 
18 #include "apexutil.h"
19 
20 #include <dirent.h>
21 
22 #include <memory>
23 
24 #include <android-base/file.h>
25 #include <android-base/logging.h>
26 #include <android-base/result.h>
27 #include <apex_manifest.pb.h>
28 
29 using ::android::base::Error;
30 using ::android::base::ReadFileToString;
31 using ::android::base::Result;
32 using ::apex::proto::ApexManifest;
33 
34 namespace {
35 
36 Result<ApexManifest> ParseApexManifest(const std::string &manifest_path) {
37   std::string content;
38   if (!ReadFileToString(manifest_path, &content)) {
39     return Error() << "Failed to read manifest file: " << manifest_path;
40   }
41   ApexManifest manifest;
42   if (!manifest.ParseFromString(content)) {
43     return Error() << "Can't parse APEX manifest: " << manifest_path;
44   }
45   return manifest;
46 }
47 
48 } // namespace
49 
50 namespace android {
51 namespace apex {
52 
53 std::map<std::string, ApexManifest>
54 GetActivePackages(const std::string &apex_root) {
55   std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(apex_root.c_str()),
56                                                 closedir);
57   if (!dir) {
58     return {};
59   }
60 
61   std::map<std::string, ApexManifest> apexes;
62   dirent *entry;
63   while ((entry = readdir(dir.get())) != nullptr) {
64     if (entry->d_name[0] == '.')
65       continue;
66     if (entry->d_type != DT_DIR)
67       continue;
68     if (strchr(entry->d_name, '@') != nullptr)
69       continue;
70     std::string apex_path = apex_root + "/" + entry->d_name;
71     auto manifest = ParseApexManifest(apex_path + "/apex_manifest.pb");
72     if (manifest.ok()) {
73       apexes.emplace(std::move(apex_path), std::move(*manifest));
74     } else {
75       LOG(WARNING) << manifest.error();
76     }
77   }
78   return apexes;
79 }
80 
81 } // namespace apex
82 } // namespace android
83