开发板linux自动挂载U盘和SD卡/Automount usb disk and sdcard on the linux

-   由 [Nicola Zhang]( /display/~nzhang
    )创建, 最终由 [Lu Lei (Bob)]( /display/~llu
    )修改于 [11 18, 2020](/pages/diffpagesbyversion.action?pageId=91984762&selectedPageVersions=9&selectedPageVersions=10)

usb和sdcard的自动挂载规则是在/etc/udev/rules.d/目录下,

#### u盘自动挂载规则

KERNEL!="sd\[a-z\]\[0-9\]",GOTO="automount\_exit"
ACTION=="add", SUBSYSTEMS=="usb", SUBSYSTEM=="block",RUN+="/bin/mkdir /mnt/usb",RUN+="/usr/bin/systemd-mount --no-block --automount=yes $devnode /mnt/usb"
ACTION=="remove", RUN+="/usr/bin/systemd-umount /mnt/usb",RUN+="/bin/rmdir  /mnt/usb"
LABEL="automount\_exit"

#### sdcard自动挂载规则

KERNEL!="mmcblk0p1",GOTO="automount\_exit"
ACTION=="add", SUBSYSTEM=="block",RUN+="/bin/mkdir /mnt/sd",RUN+="/usr/bin/systemd-mount --no-block --automount=yes $devnode /mnt/sd"
ACTION=="remove", RUN+="/usr/bin/systemd-umount /mnt/sd",RUN+="/bin/rmdir /mnt/sd"
LABEL="automount\_exit"

udev规则可参考udev文档说明:

[https://www.freedesktop.org/software/systemd/man/udev.html](https://www.freedesktop.org/software/systemd/man/udev.html)

systemd-mount的用法请参考：

[https://www.freedesktop.org/software/systemd/man/systemd-mount.html](https://www.freedesktop.org/software/systemd/man/systemd-mount.html)

以上例子中的udev规则中匹配sd\[a-z\]\[0-9\]的设备, 当系统中检查usb设备插入时, 就会执行add中的操作, 当检查到usb设备拔出后, 就会执行remove中的操作.

udev规则定义完成后, 需要重新导入udev规则

udevadm control --reload-rules