1 /*
2 * Copyright (C) 2022 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 #include "Apex.h"
17
18 #include <android-base/format.h>
19 #include <android-base/logging.h>
20 #include <android-base/strings.h>
21
22 #include "com_android_apex.h"
23 #include "constants-private.h"
24
25 using android::base::StartsWith;
26
27 namespace android {
28 namespace vintf {
29 namespace details {
30
DeviceVintfDirs(FileSystem * fileSystem,std::vector<std::string> * dirs,std::string * error)31 status_t Apex::DeviceVintfDirs(FileSystem* fileSystem, std::vector<std::string>* dirs,
32 std::string* error) {
33 std::vector<std::string> vendor;
34 std::vector<std::string> odm;
35
36 // Update cached mtime_
37 int64_t mtime;
38 auto status = fileSystem->modifiedTime(kApexInfoFile, &mtime, error);
39
40 if (status != OK) {
41 switch (status) {
42 case NAME_NOT_FOUND:
43 status = OK;
44 break;
45 case -EACCES:
46 // Don't error out on access errors, but log it
47 LOG(WARNING) << "APEX Device VINTF Dirs: EACCES: "
48 << (error ? *error : "(unknown error message)");
49 status = OK;
50 break;
51 default:
52 break;
53 }
54
55 if ((status == OK) && (error)) {
56 error->clear();
57 }
58
59 return status;
60 }
61
62 mtime_ = mtime;
63
64 // Load apex-info-list
65 std::string xml;
66 status = fileSystem->fetch(kApexInfoFile, &xml, error);
67 if (status == NAME_NOT_FOUND) {
68 if (error) {
69 error->clear();
70 }
71 return OK;
72 }
73 if (status != OK) return status;
74
75 auto apexInfoList = com::android::apex::parseApexInfoList(xml.c_str());
76 if (!apexInfoList.has_value()) {
77 if (error) {
78 *error = std::string("Not a valid XML ") + kApexInfoFile;
79 }
80 return UNKNOWN_ERROR;
81 }
82
83 // Get vendor apex vintf dirs
84 for (const auto& apexInfo : apexInfoList->getApexInfo()) {
85 // Skip non-active apexes
86 if (!apexInfo.getIsActive()) continue;
87 // Skip if no preinstalled paths. This shouldn't happen but XML schema says it's optional.
88 if (!apexInfo.hasPreinstalledModulePath()) continue;
89
90 const std::string& path = apexInfo.getPreinstalledModulePath();
91 if (StartsWith(path, "/vendor/apex/") || StartsWith(path, "/system/vendor/apex/")) {
92 dirs->push_back(fmt::format("/apex/{}/" VINTF_SUB_DIR, apexInfo.getModuleName()));
93 }
94 }
95 return OK;
96 }
97
98 // Returns true when /apex/apex-info-list.xml is updated
HasUpdate(FileSystem * fileSystem) const99 bool Apex::HasUpdate(FileSystem* fileSystem) const {
100 int64_t mtime{};
101 std::string error;
102 status_t status = fileSystem->modifiedTime(kApexInfoFile, &mtime, &error);
103 if (status == NAME_NOT_FOUND) {
104 return false;
105 }
106 if (status != OK) {
107 LOG(ERROR) << error;
108 return false;
109 }
110 return mtime != mtime_;
111 }
112
113 } // namespace details
114 } // namespace vintf
115 } // namespace android
116