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 #include <string.h>
22 
23 #include <memory>
24 
25 #include <android-base/file.h>
26 #include <android-base/logging.h>
27 #include <android-base/result.h>
28 #include <apex_manifest.pb.h>
29 
30 using ::android::base::Error;
31 using ::android::base::ReadFileToString;
32 using ::android::base::Result;
33 using ::apex::proto::ApexManifest;
34 
35 namespace {
36 
37 Result<ApexManifest> ParseApexManifest(const std::string &manifest_path) {
38   std::string content;
39   if (!ReadFileToString(manifest_path, &content)) {
40     return Error() << "Failed to read manifest file: " << manifest_path;
41   }
42   ApexManifest manifest;
43   if (!manifest.ParseFromString(content)) {
44     return Error() << "Can't parse APEX manifest: " << manifest_path;
45   }
46   return manifest;
47 }
48 
49 } // namespace
50 
51 namespace android {
52 namespace apex {
53 
54 std::map<std::string, ApexManifest>
55 GetActivePackages(const std::string &apex_root) {
56   std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(apex_root.c_str()),
57                                                 closedir);
58   if (!dir) {
59     return {};
60   }
61 
62   std::map<std::string, ApexManifest> apexes;
63   dirent *entry;
64   while ((entry = readdir(dir.get())) != nullptr) {
65     if (entry->d_name[0] == '.')
66       continue;
67     if (entry->d_type != DT_DIR)
68       continue;
69     if (strchr(entry->d_name, '@') != nullptr)
70       continue;
71     if (strcmp(entry->d_name, "sharedlibs") == 0)
72       continue;
73     std::string apex_path = apex_root + "/" + entry->d_name;
74     auto manifest = ParseApexManifest(apex_path + "/apex_manifest.pb");
75     if (manifest.ok()) {
76       apexes.emplace(std::move(apex_path), std::move(*manifest));
77     } else {
78       LOG(WARNING) << manifest.error();
79     }
80   }
81   return apexes;
82 }
83 
84 } // namespace apex
85 } // namespace android
86