经过几次错误的开始,我想出了这个.关键是在udev和安装脚本之间添加systemd单元服务.

(为了记录,我无法使用udeks2(通过类似udisksctl mount -b / dev / sdb1之类的东西)直接从udev规则或系统单元文件中调用它.这似乎有竞争条件和设备节点还没有准备就绪,导致查找设备/ dev / sdb1的对象时出错.不幸的是,因为udisks2可以处理所有挂载点杂乱……)

繁重的工作由shell脚本完成,该脚本负责创建和删除安装点,以及安装和卸载驱动器.

/usr/local/bin/usb-mount.sh

#!/bin/bash

# This script is called from our systemd unit file to mount or unmount

# a USB drive.

usage()

{

echo "Usage: $0 {add|remove} device_name (e.g. sdb1)"

exit 1

}

if [[ $# -ne 2 ]]; then

usage

fi

ACTION=$1

DEVBASE=$2

DEVICE="/dev/${DEVBASE}"

# See if this drive is already mounted,and if so where

MOUNT_POINT=$(/bin/mount | /bin/grep ${DEVICE} | /usr/bin/awk '{ print $3 }')

do_mount()

{

if [[ -n ${MOUNT_POINT} ]]; then

echo "Warning: ${DEVICE} is already mounted at ${MOUNT_POINT}"

exit 1

fi

# Get info for this drive: $ID_FS_LABEL,$ID_FS_UUID,and $ID_FS_TYPE

eval $(/sbin/blkid -o udev ${DEVICE})

# Figure out a mount point to use

LABEL=${ID_FS_LABEL}

if [[ -z "${LABEL}" ]]; then

LABEL=${DEVBASE}

elif /bin/grep -q " /media/${LABEL} " /etc/mtab; then

# Already in use,make a unique one

LABEL+="-${DEVBASE}"

fi

MOUNT_POINT="/media/${LABEL}"

echo "Mount point: ${MOUNT_POINT}"

/bin/mkdir -p ${MOUNT_POINT}

# Global mount options

OPTS="rw,relatime"

# File system type specific mount options

if [[ ${ID_FS_TYPE} == "vfat" ]]; then

OPTS+=",users,gid=100,umask=000,shortname=mixed,utf8=1,flush"

fi

if ! /bin/mount -o ${OPTS} ${DEVICE} ${MOUNT_POINT}; then

echo "Error mounting ${DEVICE} (status = $?)"

/bin/rmdir ${MOUNT_POINT}

exit 1

fi

echo "**** Mounted ${DEVICE} at ${MOUNT_POINT} ****"

}

do_unmount()

{

if [[ -z ${MOUNT_POINT} ]]; then

echo "Warning: ${DEVICE} is not mounted"

else

/bin/umount -l ${DEVICE}

echo "**** Unmounted ${DEVICE}"

fi

# Delete all empty dirs in /media that aren't being used as mount

# points. This is kind of overkill,but if the drive was unmounted

# prior to removal we no longer know its mount point,and we don't

# want to leave it orphaned...

for f in /media/* ; do

if [[ -n $(/usr/bin/find "$f" -maxdepth 0 -type d -empty) ]]; then

if ! /bin/grep -q " $f " /etc/mtab; then

echo "**** Removing mount point $f"

/bin/rmdir "$f"

fi

fi

done

}

case "${ACTION}" in

add)

do_mount

;;

remove)

do_unmount

;;

*)

usage

;;

esac

反过来,脚本由systemd单元文件调用.我们使用“@”文件名语法,因此我们可以将设备名称作为参数传递.

/etc/systemd/system/usb-mount@.service

[Unit]

Description=Mount USB Drive on %i

[Service]

Type=oneshot

RemainAfterExit=true

ExecStart=/usr/local/bin/usb-mount.sh add %i

ExecStop=/usr/local/bin/usb-mount.sh remove %i

最后,一些udev规则在hotplug / unplug上启动和停止systemd单元服务：

/etc/udev/rules.d/99-local.rules

KERNEL=="sd[a-z][0-9]",SUBSYSTEMS=="usb",ACTION=="add",RUN+="/bin/systemctl start usb-mount@%k.service"

KERNEL=="sd[a-z][0-9]",ACTION=="remove",RUN+="/bin/systemctl stop usb-mount@%k.service"

这似乎可以解决问题！一些有用的命令用于调试这样的东西：

> udevadm control -l debug打开详细日志记录/ var / log / syslog,这样你就可以看到发生了什么.>修改文件后的udevadm控制–reload-rulesrules.dir(可能没有必要,但不能伤害……).>修改systemd单元文件后的systemctl守护程序重新加载.