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
17 #include <vintf/HostFileSystem.h>
18
19 #include <android-base/logging.h>
20 #include <android-base/strings.h>
21
22 namespace android::vintf::details {
23
HostFileSystem(const Dirmap & dirmap,status_t missingError)24 HostFileSystem::HostFileSystem(const Dirmap& dirmap, status_t missingError)
25 : HostFileSystem(dirmap, missingError, std::make_unique<FileSystemImpl>()) {}
26
HostFileSystem(const Dirmap & dirmap,status_t missingError,std::unique_ptr<FileSystem> && impl)27 HostFileSystem::HostFileSystem(const Dirmap& dirmap, status_t missingError,
28 std::unique_ptr<FileSystem>&& impl)
29 : HostFileSystem(dirmap, missingError, impl.get()) {
30 mImplUniq = std::move(impl);
31 }
32
HostFileSystem(const Dirmap & dirmap,status_t missingError,FileSystem * impl)33 HostFileSystem::HostFileSystem(const Dirmap& dirmap, status_t missingError, FileSystem* impl)
34 : mDirMap(dirmap), mMissingError(missingError), mImpl(impl) {}
35
fetch(const std::string & path,std::string * fetched,std::string * error) const36 status_t HostFileSystem::fetch(const std::string& path, std::string* fetched,
37 std::string* error) const {
38 auto resolved = resolve(path, error);
39 if (resolved.empty()) {
40 return mMissingError;
41 }
42 status_t status = mImpl->fetch(resolved, fetched, error);
43 LOG(INFO) << "Fetch '" << resolved << "': " << statusToString(status);
44 return status;
45 }
46
listFiles(const std::string & path,std::vector<std::string> * out,std::string * error) const47 status_t HostFileSystem::listFiles(const std::string& path, std::vector<std::string>* out,
48 std::string* error) const {
49 auto resolved = resolve(path, error);
50 if (resolved.empty()) {
51 return mMissingError;
52 }
53 status_t status = mImpl->listFiles(resolved, out, error);
54 LOG(INFO) << "List '" << resolved << "': " << statusToString(status);
55 return status;
56 }
57
resolve(const std::string & path,std::string * error) const58 std::string HostFileSystem::resolve(const std::string& path, std::string* error) const {
59 for (auto [prefix, mappedPath] : mDirMap) {
60 if (path == prefix) {
61 return mappedPath;
62 }
63 if (android::base::StartsWith(path, prefix + "/")) {
64 return mappedPath + "/" + path.substr(prefix.size() + 1);
65 }
66 }
67 if (error) {
68 *error = "Cannot resolve path " + path;
69 } else {
70 LOG(mMissingError == NAME_NOT_FOUND ? INFO : ERROR) << "Cannot resolve path " << path;
71 }
72 return "";
73 }
74
75 } // namespace android::vintf::details
76