/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "VintfObjectRecovery.h"
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#include <sys/mount.h>
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#include <set>
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#include <android-base/logging.h>
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#include <android-base/strings.h>
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#include <fs_mgr.h>
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#include <fs_mgr/roots.h>
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namespace android {
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namespace vintf {
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namespace details {
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using android::base::StartsWith;
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static const char* const kMountImageRootDir = "/mnt";
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static const char* const kSystemImageRootDir = "/mnt/system";
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class RecoveryPartitionMounter {
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public:
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RecoveryPartitionMounter() {}
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~RecoveryPartitionMounter() {
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for (const auto& pair : mounted_) {
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if (umount(pair.second.c_str()) != 0) {
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PLOG(ERROR) << "Cannot unmount " << pair.first << " at " << pair.second;
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}
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}
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mounted_.clear();
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}
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status_t mount(const std::string& path) {
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if (path == "/system") {
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return mount(android::fs_mgr::GetSystemRoot(), kSystemImageRootDir);
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}
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return mount(path, kMountImageRootDir + path);
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}
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private:
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std::map<std::string, std::string> mounted_;
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status_t mount(const std::string& path, const std::string& mountPoint) {
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if (mounted_.find(path) != mounted_.end()) {
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return OK;
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}
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android::fs_mgr::Fstab fstab;
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if (!android::fs_mgr::ReadDefaultFstab(&fstab)) {
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return errno ? -errno : UNKNOWN_ERROR;
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}
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if (!android::fs_mgr::EnsurePathMounted(&fstab, path, mountPoint)) {
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return errno ? -errno : UNKNOWN_ERROR;
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}
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mounted_.emplace(path, mountPoint);
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return OK;
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}
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};
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class RecoveryFileSystem : public FileSystem {
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public:
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RecoveryFileSystem() = default;
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status_t fetch(const std::string& path, std::string* fetched, std::string* error) const {
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const FileSystem* fs = nullptr;
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status_t err = getFileSystem(path, &fs, error);
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if (err != OK) return err;
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return fs->fetch(path, fetched, error);
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}
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status_t listFiles(const std::string& path, std::vector<std::string>* out,
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std::string* error) const {
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const FileSystem* fs = nullptr;
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status_t err = getFileSystem(path, &fs, error);
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if (err != OK) return err;
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return fs->listFiles(path, out, error);
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}
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private:
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FileSystemUnderPath mSystemFileSystem{kSystemImageRootDir};
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FileSystemUnderPath mMntFileSystem{kMountImageRootDir};
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std::unique_ptr<RecoveryPartitionMounter> mMounter =
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std::make_unique<RecoveryPartitionMounter>();
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status_t getFileSystem(const std::string& path, const FileSystem** fs,
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std::string* error) const {
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auto partition = GetPartition(path);
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if (partition.empty()) {
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if (error) *error = "Cannot list or fetch relative path " + path;
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return NAME_NOT_FOUND;
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}
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status_t err = mMounter->mount(partition);
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if (err != OK) {
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// in recovery, ignore mount errors and assume the file does not exist.
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if (error) *error = "Cannot mount for path " + path + ": " + strerror(-err);
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return NAME_NOT_FOUND;
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}
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// /system files are under /mnt/system/system because system.img contains the root dir.
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if (partition == "/system") {
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*fs = &mSystemFileSystem;
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} else {
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*fs = &mMntFileSystem;
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}
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return OK;
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}
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// /system -> /system
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// /system/foo -> /system
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static std::string GetPartition(const std::string& path) {
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if (path.empty()) return "";
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if (path[0] != '/') return "";
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auto idx = path.find('/', 1);
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if (idx == std::string::npos) return path;
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return path.substr(0, idx);
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}
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};
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} // namespace details
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// static
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int32_t VintfObjectRecovery::CheckCompatibility(const std::vector<std::string>& xmls,
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std::string* error) {
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auto vintfObject = VintfObject::Builder()
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.setFileSystem(std::make_unique<details::RecoveryFileSystem>())
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.build();
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return vintfObject->checkCompatibility(xmls, error);
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}
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} // namespace vintf
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} // namespace android
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