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A Tyshka
Asked: 2019-02-15 13:54:24 +0800 CST

没有 sudo 无法弹出 USB 驱动器？

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我正在尝试在命令行中弹出 USB 驱动器，eject /dev/sdg1但出现以下错误：

eject: unable to open `/dev/sdg'

该命令会卸载驱动器，但不会弹出它。但是，使用 sudo 运行就可以了。这是错误还是预期行为？我正在尝试将其合并到 python 应用程序中，所以 sudo 并不是一个真正的选择。请注意，umount没有 sudo 也可以正常工作。

这是一个 USB 闪存驱动器。我认为上面只有一个分区

mount usb sudo unmount udev

2 个回答

  1. Best Answer

    没有弹出 USB 设备的机制。卸载它（在您的情况下umount /dev/sdg1并手动删除它。（假设 /dev/sdg1 是 /dev/sdg 上唯一安装的分区）。您可以使用类似命令验证设备上安装了哪些分区lsblk以及mount | grep sdXsdX 对应于您的设备的位置（在你的情况下，sdg）。

    eject专门用于可移动介质，例如光驱、软盘、磁带、ZIP、JAZ 驱动器，闪存驱动器根本不支持。

    资料来源：

    man eject

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  2. 我认为在 USB 驱动器的情况下“弹出”意味着卸载和关闭电源，正如某些 GUI 工具（带有弹出符号）所实现的那样。

    您可以查看udisks和工具udisksctl。

    阅读手册

    man udisks
man udisksctl

    例如，你会发现命令

       udisksctl mount {--object-path OBJECT | --block-device DEVICE}
             [--filesystem-type TYPE] [--options OPTIONS...]
             [--no-user-interaction]

   udisksctl unmount {--object-path OBJECT | --block-device DEVICE} [--force]
             [--no-user-interaction]

   udisksctl power-off {--object-path OBJECT | --block-device DEVICE}
             [--no-user-interaction]

    我觉得

    udisksctl unmount --block-device <device> && \
udisksctl power-off --block-device <device>

    命令可以做你想做的事。在这种情况下，“sdg”中有一个分区<device>是/dev/sdg1

       power-off
       Arranges for the drive to be safely removed and powered off. On the OS
       side this includes ensuring that no process is using the drive, then
       requesting that in-flight buffers and caches are committed to stable
       storage. The exact steps for powering off the drive depends on the
       drive itself and the interconnect used. For drives connected through
       USB, the effect is that the USB device will be deconfigured followed by
       disabling the upstream hub port it is connected to.

       Note that as some physical devices contain multiple drives (for example
       4-in-1 flash card reader USB devices) powering off one drive may affect
       other drives. As such there are not a lot of guarantees associated with
       performing this action. Usually the effect is that the drive disappears
       as if it was unplugged.
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