Re: auto mount and unmount using udev rules

[Seth Kenlon]

Here's what I use for my automated backup script (see
https://gitlab.com/slackermedia/attachup for context):

If you adapt this, you'll need to update the path (I use /media),
you'll need to update the UUID, and you'll probably need to verify
that your drive has a label, because this rule uses the UUID and label
to identify the drive.

I save this as 80.local-rules in /etc/udev/rules.d
Supposedly you can do a `udevadm control reload` to force the rules to
be reloaded, but I usually reboot just to make sure udev is on top of
its game.

KERNEL!="sd[a-z][0-9]", GOTO="media_by_label_auto_mount_end"
IMPORT{program}="/sbin/blkid -o udev -p %N"
# Get label or create one
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"
ENV{ID_FS_LABEL}=="", ENV{dir_name}="usbhd-%k"
# mount
ACTION=="add", ENV{mount_options}="relatime"
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs",
ENV{mount_options}="$env{mount_options},utf8,gid=100,umask=002"
# Clean up after removal
ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/umount -l
/media/%E{dir_name}", RUN+="/bin/rmdir /media/%E{dir_name}"
# Exit
LABEL="media_by_label_auto_mount_end"
#mount
ACTION=="add",ENV{ID_FS_UUID}=="165f84bc-1d70-47a4-9fdc-7a588fa457c4",RUN+="/bin/mkdir
-p /media/%E{dir_name}",RUN+="/bin/mount -o $env{mount_options}
/dev/%k /media/%E{dir_name}",MODE="0770",GROUP="users"

On Wed, May 15, 2019 at 11:37 PM Danishka Navin <danishka(a)gmail.com&gt; wrote:
>
> Hi,
>
> I am trying to mount a USB drive to given symlink and mount it to a given mount
point.
> Mount is working but when the device removed, I can still see the mount
>
> cat /etc/udev/rules.d/81-hnt-usb-rule.rules
> ACTION=="add", KERNEL=="sd?1", SUBSYSTEM=="block",
ENV{ID_BUS}=="usb", \
>    SYMLINK+="hanthana%n",
ENV{SYSTEMD_WANTS}="hnt-usb-rule.service"
>
> ACTION=="remove",  RUN+="/usr/bin/umount $(/usr/bin/mount | grep
backup | /usr/bin/awk '{print $1}')"
>
>
------------------------------------------------------------------------------------------------
> [danishka@hanthana ~]$ cat /etc/systemd/system/hnt-usb-rule.service
> [Unit]
> Description=USB Mount
>
>
> [Service]
> Type=oneshot
> ExecStart=/root/hnt.sh
>
> [Install]
> WantedBy=default.target
>
----------------------------------------------------------------------------------------------------------
> cat /root/hnt.sh
> #!/bin/bash
> mkdir /backup
> lsblk > /var/log/hnt.log
> /usr/bin/mount /dev/hanthana1 /backup
>
>
------------------------------------------------------------------------------------------------
>
> ACTION=="remove",  RUN+="/usr/bin/umount $(/usr/bin/mount | grep
backup | /usr/bin/awk '{print $1}')"
>
>
> [root@hanthana ~]# echo $(/usr/bin/mount | grep backup | /usr/bin/awk '{print
$1}')
> /dev/sda1
>
> Even though you can't access /backup after removing the USB, mount command shows
following results (After plugin the usb and remove several times). I wonder why it
automatically remove these entries as fedora normally mount USBs on default location.
>
> /dev/sda1 on /backup type ext4 (rw, relatime, seclabel)
> /dev/sdb1 on /backup type ext4 (rw, relatime, seclabel)
> /dev/sdc1 on /backup type ext4 (rw, relatime, seclabel)
> /dev/sdd1 on /backup type ext4 (rw, relatime, seclabel)
>
> I was testing on both Fedora 28 Gnome and LXDE.
>
> Regards,
> --
> Danishka Navin
>
>
>
>
>
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