macos - 插入 USB 设备时获取挂载点 Mac OS X 和 linux

Question

我正在尝试在 Mac OS 和 Linux 中开发一个程序，该程序列出 USB 驱动器中的文件和文件夹。当 USB 设备连接和移除时，我需要获取一些事件。我知道在 Mac OS XI 中可以使用 IOKit。但是我不知道如何获取挂载设备的挂载点。我可以使用 IOkit 获得它吗？是否有适用于 Linux 和 Mac 的跨平台解决方案？

Answer 1

不，没有。在 Linux 下，您可以使用 HAL 或 DeviceKit-disks D-Bus 接口。请注意，这些是可选组件，可能不存在。HAL 较旧，DeviceKit-disks 是较新的实现，用 DK-d 替换 HAL。

Answer 2

我用于获取可用挂载点（使用 Java）的方法将“system_profiler SPUSBDataType -xml”命令的输出通过管道传输到dd-plist处理器。它随后在 USB 层次结构中递归，匹配具有“volumes”键的那些。对于此数组中的每个项目，检索“mount_point”键以检索它的安装位置。请参阅下面的代码示例：

/*
Copyright © 2014 Edwin de Jong. All Rights Reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY [LICENSOR] "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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package nl.topicuszorg.laos.util.osx;

import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.util.List;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;

import nl.topicuszorg.laos.model.response.MountState;
import nl.topicuszorg.laos.model.response.MountedDevice;

import org.xml.sax.SAXException;

import com.dd.plist.NSArray;
import com.dd.plist.NSDictionary;
import com.dd.plist.NSObject;
import com.dd.plist.NSString;
import com.dd.plist.PropertyListFormatException;
import com.dd.plist.PropertyListParser;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;

public class USBHelpers
{
  private static final String SYSTEM_PROFILER_COMMAND = "/usr/sbin/system_profiler";

  private static final String SPUSB_DATA_TYPE = "SPUSBDataType";

  private interface SpUSBDataTypeIdentifiers
  {
    String ITEMS = "_items";

    String VOLUMES = "volumes";

    String VENDOR_ID = "vendor_id";

    String MOUNT_POINT = "mount_point";

    String NAME = "_name";
  }

  public static List<MountedDevice> findMountedDevicesOsX() throws IOException, PropertyListFormatException,
    ParseException, ParserConfigurationException, SAXException
  {
    final Process process = new ProcessBuilder(SYSTEM_PROFILER_COMMAND, SPUSB_DATA_TYPE, "-xml")
      .start();
    return findMountedDevicesInConfiguration(process.getInputStream());
  }

  private static List<MountedDevice> findMountedDevicesInConfiguration(final InputStream processInputStream)
    throws IOException, PropertyListFormatException, ParseException, ParserConfigurationException, SAXException
  {
    // Root is an array, the USB devices are hierarchical in _items (and eg. _items(0)._items)
    final NSArray array = (NSArray) (PropertyListParser.parse(processInputStream));
    final NSDictionary dict = (NSDictionary) array.objectAtIndex(0);
    final NSArray itemsArray = (NSArray) dict.get(SpUSBDataTypeIdentifiers.ITEMS);
    return recurseUSBDevices(itemsArray);
  }

  public static List<MountedDevice> recurseUSBDevices(NSArray items)
  {
    final Builder<MountedDevice> builder = ImmutableList.builder();
    for (NSObject item : items.getArray())
    {
      builder.addAll(recurseUSBDevice((NSDictionary) item));
    }

    return builder.build();
  }

  private static List<MountedDevice> recurseUSBDevice(final NSDictionary dict)
  {
    final Builder<MountedDevice> builder = ImmutableList.builder();
    for (final Map.Entry<String, NSObject> entry : dict.entrySet())
    {
      if (entry.getKey().equals(SpUSBDataTypeIdentifiers.ITEMS))
      {
        // The USB device is a hub
        builder.addAll(recurseUSBDevices((NSArray) entry.getValue()));
      }
      if (entry.getKey().equals(SpUSBDataTypeIdentifiers.VOLUMES))
      {
        // This is a mountable device. We need to get the volumes, and for each volume, return it.
        List<MountedDevice> mountedDeviceOpt = parseVolumes((NSArray) (entry.getValue()));
        for (MountedDevice mountedDevice : mountedDeviceOpt)
        {
          mountedDevice.setVendorId(((NSString) dict.get(SpUSBDataTypeIdentifiers.VENDOR_ID)).toString());
          builder.add(mountedDevice);
        }
      }
    }
    return builder.build();
  }

  private static List<MountedDevice> parseVolumes(final NSArray nsArray)
  {
    final Builder<MountedDevice> builder = ImmutableList.builder();
    for (final NSObject item : nsArray.getArray())
    {
      builder.add(parseVolume((NSDictionary) item));
    }
    return builder.build();

  }

  private static MountedDevice parseVolume(final NSDictionary item)
  {
    final String mountPoint = ((NSString) item.get(SpUSBDataTypeIdentifiers.MOUNT_POINT)).toString();
    final String name = ((NSString) item.get(SpUSBDataTypeIdentifiers.NAME)).toString();
    return new MountedDevice(mountPoint, name, null, null, MountState.MOUNTED);
  }

}