背景
项目上要实现外接硬盘，插上后自动挂载到某个目录的功能。但是插上硬盘时因为颠簸设备随时会掉线，掉线时可能还会在写入数据。所以最终要求掉线又连上的时候还能继续挂载到该目录
方案：使用udev实现
/etc/udev/rules.d/99-uto-logger.rules
ACTION=="add", KERNEL=="sd[a-zA-Z][0-9]", SUBSYSTEM=="block", SUBSYSTEMS=="usb", RUN+="/usr/bin/systemd-run /usr/local/bin/logger-usb.sh add %k"
ACTION=="remove", KERNEL=="sd[a-zA-Z][0-9]", SUBSYSTEM=="block", SUBSYSTEMS=="usb", RUN+="/usr/bin/systemd-run /usr/local/bin/logger-usb.sh remove %k"
/usr/local/bin/logger-usb.sh
#!/bin/bash
ACTION=$1
DEVBASE=$2
MOUNT_POINT="/log_data"
DEVICE="/dev/${DEVBASE}"
do_mount()
{
mkdir -p $MOUNT_POINT
mount $DEVICE $MOUNT_POINT
sudo chown -R nvidia:nvidia $MOUNT_POINT
}
do_unmount()
{
umount -l $MOUNT_POINT
rm -rf $MOUNT_POINT
}
case "${ACTION}" in
add)
do_mount
;;
remove)
do_unmount
;;
esac
关于为什么要用systemd-run的坑
systemd下的udev工作并不正常，图里的回答讲的很清楚了
参考链接
https://andreafortuna.org/2019/06/26/automount-usb-devices-on-linux-using-udev-and-systemd/
https://blog.csdn.net/qq_37730663/article/details/105270838
https://unix.stackexchange.com/questions/204906/linux-mount-command-returns-zero-0-but-not-working
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