1536db887f
This class adds a wrapper to the runtime dependent functions. Therefore, the behavior of update on device stays the same, while simulators can have their own implementations. Also change the caller side of the registered updater functions to call these runtime wrappers. Bug: 131911365 Test: unit tests pass, sideload an update on cuttlefish Change-Id: Ib3ab67132991d67fc132f27120e4152439d16ac5
132 lines
4.5 KiB
C++
132 lines
4.5 KiB
C++
/*
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* Copyright (C) 2019 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 "updater/updater_runtime.h"
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/strings.h>
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#include <android-base/unique_fd.h>
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#include <ext4_utils/wipe.h>
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#include <selinux/label.h>
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#include <tune2fs.h>
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#include "otautil/mounts.h"
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#include "otautil/sysutil.h"
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std::string UpdaterRuntime::GetProperty(const std::string_view key,
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const std::string_view default_value) const {
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return android::base::GetProperty(std::string(key), std::string(default_value));
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}
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std::string UpdaterRuntime::FindBlockDeviceName(const std::string_view name) const {
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return std::string(name);
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}
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int UpdaterRuntime::Mount(const std::string_view location, const std::string_view mount_point,
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const std::string_view fs_type, const std::string_view mount_options) {
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std::string mount_point_string(mount_point);
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char* secontext = nullptr;
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if (sehandle_) {
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selabel_lookup(sehandle_, &secontext, mount_point_string.c_str(), 0755);
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setfscreatecon(secontext);
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}
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mkdir(mount_point_string.c_str(), 0755);
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if (secontext) {
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freecon(secontext);
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setfscreatecon(nullptr);
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}
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return mount(std::string(location).c_str(), mount_point_string.c_str(),
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std::string(fs_type).c_str(), MS_NOATIME | MS_NODEV | MS_NODIRATIME,
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std::string(mount_options).c_str());
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}
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bool UpdaterRuntime::IsMounted(const std::string_view mount_point) const {
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scan_mounted_volumes();
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MountedVolume* vol = find_mounted_volume_by_mount_point(std::string(mount_point).c_str());
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return vol != nullptr;
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}
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std::pair<bool, int> UpdaterRuntime::Unmount(const std::string_view mount_point) {
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scan_mounted_volumes();
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MountedVolume* vol = find_mounted_volume_by_mount_point(std::string(mount_point).c_str());
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if (vol == nullptr) {
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return { false, -1 };
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}
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int ret = unmount_mounted_volume(vol);
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return { true, ret };
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}
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bool UpdaterRuntime::ReadFileToString(const std::string_view filename, std::string* content) const {
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return android::base::ReadFileToString(std::string(filename), content);
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}
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bool UpdaterRuntime::WriteStringToFile(const std::string_view content,
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const std::string_view filename) const {
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return android::base::WriteStringToFile(std::string(content), std::string(filename));
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}
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int UpdaterRuntime::WipeBlockDevice(const std::string_view filename, size_t len) const {
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android::base::unique_fd fd(open(std::string(filename).c_str(), O_WRONLY));
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if (fd == -1) {
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PLOG(ERROR) << "Failed to open " << filename;
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return false;
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}
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// The wipe_block_device function in ext4_utils returns 0 on success and 1 for failure.
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return wipe_block_device(fd, len);
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}
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int UpdaterRuntime::RunProgram(const std::vector<std::string>& args, bool is_vfork) const {
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CHECK(!args.empty());
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auto argv = StringVectorToNullTerminatedArray(args);
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LOG(INFO) << "about to run program [" << args[0] << "] with " << argv.size() << " args";
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pid_t child = is_vfork ? vfork() : fork();
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if (child == 0) {
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execv(argv[0], argv.data());
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PLOG(ERROR) << "run_program: execv failed";
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_exit(EXIT_FAILURE);
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}
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int status;
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waitpid(child, &status, 0);
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if (WIFEXITED(status)) {
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if (WEXITSTATUS(status) != 0) {
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LOG(ERROR) << "run_program: child exited with status " << WEXITSTATUS(status);
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}
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} else if (WIFSIGNALED(status)) {
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LOG(ERROR) << "run_program: child terminated by signal " << WTERMSIG(status);
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}
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return status;
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}
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int UpdaterRuntime::Tune2Fs(const std::vector<std::string>& args) const {
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auto tune2fs_args = StringVectorToNullTerminatedArray(args);
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// tune2fs changes the filesystem parameters on an ext2 filesystem; it returns 0 on success.
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return tune2fs_main(tune2fs_args.size() - 1, tune2fs_args.data());
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}
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