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95 lines
3.1 KiB
95 lines
3.1 KiB
4 months ago
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/*
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* Copyright (C) 2020 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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#ifndef ANDROID_APEXD_APEXD_ROLLBACK_UTILS_H_
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#define ANDROID_APEXD_APEXD_ROLLBACK_UTILS_H_
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#include <filesystem>
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#include <string>
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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#include <android-base/result.h>
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#include <android-base/scopeguard.h>
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#include <logwrap/logwrap.h>
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namespace android {
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namespace apex {
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static constexpr const char* kCpPath = "/system/bin/cp";
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/**
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* Copies everything including directories from the "from" path to the "to"
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* path. Note that this will fail if run before APEXes are mounted, due to a
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* dependency on runtime.
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*/
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inline int32_t CopyDirectoryRecursive(const char* from, const char* to) {
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const char* const argv[] = {
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kCpPath,
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"-F", /* delete any existing destination file first
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(--remove-destination) */
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"-p", /* preserve timestamps, ownership, and permissions */
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"-R", /* recurse into subdirectories (DEST must be a directory) */
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"-P", /* Do not follow symlinks [default] */
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"-d", /* don't dereference symlinks */
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from,
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to};
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LOG(DEBUG) << "Copying " << from << " to " << to;
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return logwrap_fork_execvp(arraysize(argv), argv, nullptr, false, LOG_ALOG,
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false, nullptr);
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}
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/**
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* Deletes any files at to_path, and then copies all files and directories
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* from from_path into to_path. Note that this must be run after APEXes are
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* mounted.
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*/
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inline android::base::Result<void> ReplaceFiles(const std::string& from_path,
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const std::string& to_path) {
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namespace fs = std::filesystem;
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std::error_code error_code;
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fs::remove_all(to_path, error_code);
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if (error_code) {
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return android::base::Error() << "Failed to delete existing files at "
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<< to_path << " : " << error_code.message();
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}
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auto deleter = [&] {
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std::error_code error_code;
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fs::remove_all(to_path, error_code);
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if (error_code) {
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LOG(ERROR) << "Failed to clean up files at " << to_path << " : "
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<< error_code.message();
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}
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};
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auto scope_guard = android::base::make_scope_guard(deleter);
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int rc = CopyDirectoryRecursive(from_path.c_str(), to_path.c_str());
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if (rc != 0) {
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return android::base::Error() << "Failed to copy from [" << from_path
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<< "] to [" << to_path << "]";
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}
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scope_guard.Disable();
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return {};
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}
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} // namespace apex
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} // namespace android
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#endif // ANDROID_APEXD_APEXD_ROLLBACK_UTILS_H_
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