使用 systemd 自动挂载 ATA/SCSI 驱动器

Question

我正在尝试自动挂载所有ATA/SCSI在启动时使用驱动systemd器udev 没有利用/etc/fstab。

这是必要的，因为文件系统需要挂载在目录上以其 UUID 命名，并且驱动器总是被冷交换为新驱动器，因此不断修改fstab变得繁琐乏味。

为了做到这一点，我使用了以下方法脚本，系统单元文件， 和udev 规则改编自针对 USB 驱动器的类似问题的答案。

然而，虽然这个答案适用于 USB 驱动器，但它不起作用适用于 ATA/SCSI 驱动器：脚本似乎成功执行并创建了所有必要的目录，但启动完成后，没有安装任何内容。脚本确实有效但是，当手动运行时。

---

/usr/local/bin/automount.sh：

#!/bin/bash
ACTION=$1
DEVBASE=$2
DEVICE="/dev/${DEVBASE}"
SAVE="/root/${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})

    # Check if drive is already mounted / duplicate UUID
    LABEL=${ID_FS_UUID}
    /bin/grep -q " /media/${LABEL} " /etc/mtab \
        && ( echo "UUID ${LABEL} already in use"'!'; exit 1 )

    # Set mount point and save for later (in case of "yanked" unmount)
    MOUNT_POINT="/media/${LABEL}"
    echo "MOUNT_POINT=${MOUNT_POINT}" | /usr/bin/tee "${SAVE}"

    # Create mount point
    /bin/mkdir -p ${MOUNT_POINT}

    # Global mount options
    OPTS="rw,relatime"

    # File system type specific mount options
    case "${ID_FS_TYPE}" in
        vfat)
            OPTS+=",users,gid=100,umask=000,shortname=mixed,utf8=1,flush"
            ;;
    esac

    if ! /bin/mount -o ${OPTS} ${DEVICE} ${MOUNT_POINT}
    then
        echo "Error mounting ${DEVICE} (status = $?)"
        /bin/rmdir ${MOUNT_POINT}
        /bin/rm ${SAVE}
        exit 1
    fi

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

do_unmount()
{
    eval $(/bin/cat "${SAVE}")

    [[ -z ${MOUNT_POINT} ]] \
        && ( echo "Warning: ${DEVICE} is not mounted"; exit 0)

    /bin/umount -l ${DEVICE} \
        && ( echo "**** Unmounted ${DEVICE}"; /bin/rm ${SAVE} ) \
        || ( echo "Unmounting ${DEVICE} failed"'!'; exit 1 )
}

case "${ACTION}" in
    add)
        do_mount
        ;;
    remove)
        do_unmount
        ;;
    *)
        echo "BAD OPTION ${ACTION}"'!'
        exit 1
        ;;
esac

/etc/systemd/系统/[电子邮件保护]：

[Unit]
Description=Automount ATA/SCSI drive on %i

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/usr/local/bin/automount.sh add %i
ExecStop=/usr/local/bin/automount.sh remove %i

/etc/udev/rules.d/11-automount-ata-scsi.rules：

KERNEL!="sd[a-z][0-9]", SUBSYSTEMS!="scsi", GOTO="automount_ata_scsi_end"

ACTION=="add", RUN+="/bin/systemctl start automount@%k.service"

ACTION=="remove", RUN+="/bin/systemctl stop automount@%k.service"

LABEL="automount_ata_scsi_end"

---

（从外观上看，ATA/SCSI 驱动器确实会通过这种设置短暂地安装，但随后在启动过程中以某种方式卸载。）