| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <linux/dm-ioctl.h> |
| #include <sys/ioctl.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <android-base/unique_fd.h> |
| #include <libdm/dm.h> |
| |
| #include <functional> |
| #include <iomanip> |
| #include <ios> |
| #include <iostream> |
| #include <map> |
| #include <string> |
| #include <vector> |
| |
| using DeviceMapper = ::android::dm::DeviceMapper; |
| using DmTable = ::android::dm::DmTable; |
| using DmTarget = ::android::dm::DmTarget; |
| using DmBlockDevice = ::android::dm::DeviceMapper::DmBlockDevice; |
| |
| static int Usage(void) { |
| std::cerr << "usage: dmctl <command> [command options]" << std::endl; |
| std::cerr << "commands:" << std::endl; |
| std::cerr << " create <dm-name> [<dm-target> [-lo <filename>] <dm-target-args>]" << std::endl; |
| std::cerr << " delete <dm-name>" << std::endl; |
| std::cerr << " list <devices | targets>" << std::endl; |
| std::cerr << " help" << std::endl; |
| return -EINVAL; |
| } |
| |
| static int DmCreateCmdHandler(int argc, char** argv) { |
| if (argc < 1) { |
| std::cerr << "Usage: dmctl create <name> [table-args]" << std::endl; |
| return -EINVAL; |
| } |
| |
| DmTable table; |
| |
| std::string name = argv[0]; |
| DeviceMapper& dm = DeviceMapper::Instance(); |
| if (!dm.CreateDevice(name, table)) { |
| std::cerr << "Failed to create device-mapper device with name: " << name << std::endl; |
| return -EIO; |
| } |
| |
| // if we also have target specified |
| if (argc > 1) { |
| // fall through for now. This will eventually create a DmTarget() based on the target name |
| // passing it the table that is specified at the command line |
| } |
| |
| return 0; |
| } |
| |
| static int DmDeleteCmdHandler(int argc, char** argv) { |
| if (argc < 1) { |
| std::cerr << "Usage: dmctl delete <name>" << std::endl; |
| return -EINVAL; |
| } |
| |
| std::string name = argv[0]; |
| DeviceMapper& dm = DeviceMapper::Instance(); |
| if (!dm.DeleteDevice(name)) { |
| std::cerr << "Failed to delete [" << name << "]" << std::endl; |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int DmListTargets(DeviceMapper& dm) { |
| std::vector<DmTarget> targets; |
| if (!dm.GetAvailableTargets(&targets)) { |
| std::cerr << "Failed to read available device mapper targets" << std::endl; |
| return -errno; |
| } |
| |
| std::cout << "Available Device Mapper Targets:" << std::endl; |
| if (targets.empty()) { |
| std::cout << " <empty>" << std::endl; |
| return 0; |
| } |
| |
| for (const auto& target : targets) { |
| std::cout << std::left << std::setw(20) << target.name() << " : " << target.version() |
| << std::endl; |
| } |
| |
| return 0; |
| } |
| |
| static int DmListDevices(DeviceMapper& dm) { |
| std::vector<DmBlockDevice> devices; |
| if (!dm.GetAvailableDevices(&devices)) { |
| std::cerr << "Failed to read available device mapper devices" << std::endl; |
| return -errno; |
| } |
| std::cout << "Available Device Mapper Devices:" << std::endl; |
| if (devices.empty()) { |
| std::cout << " <empty>" << std::endl; |
| return 0; |
| } |
| |
| for (const auto& dev : devices) { |
| std::cout << std::left << std::setw(20) << dev.name() << " : " << dev.Major() << ":" |
| << dev.Minor() << std::endl; |
| } |
| |
| return 0; |
| } |
| |
| static const std::map<std::string, std::function<int(DeviceMapper&)>> listmap = { |
| {"targets", DmListTargets}, |
| {"devices", DmListDevices}, |
| }; |
| |
| static int DmListCmdHandler(int argc, char** argv) { |
| if (argc < 1) { |
| std::cerr << "Invalid arguments, see \'dmctl help\'" << std::endl; |
| return -EINVAL; |
| } |
| |
| DeviceMapper& dm = DeviceMapper::Instance(); |
| for (const auto& l : listmap) { |
| if (l.first == argv[0]) return l.second(dm); |
| } |
| |
| std::cerr << "Invalid argument to \'dmctl list\': " << argv[0] << std::endl; |
| return -EINVAL; |
| } |
| |
| static int HelpCmdHandler(int /* argc */, char** /* argv */) { |
| Usage(); |
| return 0; |
| } |
| |
| static std::map<std::string, std::function<int(int, char**)>> cmdmap = { |
| {"create", DmCreateCmdHandler}, |
| {"delete", DmDeleteCmdHandler}, |
| {"list", DmListCmdHandler}, |
| {"help", HelpCmdHandler}, |
| }; |
| |
| int main(int argc, char** argv) { |
| android::base::InitLogging(argv, &android::base::StderrLogger); |
| if (argc < 2) { |
| return Usage(); |
| } |
| |
| for (const auto& cmd : cmdmap) { |
| if (cmd.first == argv[1]) { |
| return cmd.second(argc - 2, argv + 2); |
| } |
| } |
| |
| return Usage(); |
| } |