udev rule for Home Assistant OS (hassio) to mount USB drives into the Supervisor Media directory

80-mount-usb-to-media-by-label.rules

#
# udev rule
#   Mount USB drive to the media directory using the partition name as mount point
#
# Description:
#   Created for Home Assistant OS, this rule mounts any USB drives
#   into the Hassio media directory (/mnt/data/supervisor/media).
#   When a USB drive is connected to the board, the rule creates one directory
#   per partition under the media directory. The newly created partition is named
#   as the partition name. If the partition does not have a name, then the following
#   name format is used: "usb-{block-name}" where the block name is sd[a-z][0-9].
#
# Note 1:
#   The rule name is always prefixed with a number. In this case, the rule uses 80.
#   This represents the order of the rule when multiple rules exists in udev.
#   Low numbers run first, high numbers run last. However, low numbers do not have all
#   the facilities than high numbers may have.
#   For this rule to run properly, use numbers equal or greater than 80.
#
# Note 2:
#   This rule will skip mounting the 'CONFIG' USB key.
#   https://github.com/home-assistant/operating-system/blob/dev/Documentation/configuration.md
#
# Note 3:
#   This rule will mount the OS partitions if the OS is sorted on a USB drive (i.e. USB booting).
#   To prevent this issue from happening, update the rule to skip the booting USB drive.
#   See the CAUTION message below.
#
# Source of inspiration:
#   https://www.axllent.org/docs/auto-mounting-usb-storage/
#
# Useful links:
#   https://wiki.archlinux.org/index.php/Udev
#
# udev commands:
#   - Restart udev to reload new rules:
#       udevadm control --reload-rules
#   - List device attributes of sdb1:
#       udevadm info --attribute-walk --name=/dev/sdb1
#   - List environment variables of sdb1:
#       udevadm info /dev/sdb1
#   - Trigger add/remove event for sdb1:
#       udevadm trigger --verbose --action=add --sysname-match=sdb1
#       udevadm trigger --verbose --action=remove --sysname-match=sdb1
#


# Filter on block devices, exit otherwise
# CAUTION: Change to 'sd[b-z][0-9]' if booting from a USB drive (e.g.: sda)
KERNEL!="sd[a-z][0-9]", GOTO="abort_rule"

# Skip none USB devices (e.g.: internal SATA drive)
ENV{ID_PATH}!="*-usb-*", GOTO="abort_rule"

# Import the partition info into the environment variables
IMPORT{program}="/usr/sbin/blkid -o udev -p %N"

# Exit if partition is not a filesystem
ENV{ID_FS_USAGE}!="filesystem", GOTO="abort_rule"

# Exit if this is the 'CONFIG' USB key
ENV{ID_FS_LABEL}=="CONFIG", GOTO="abort_rule"

# Get the partition name if present, otherwise create one
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"
ENV{ID_FS_LABEL}=="", ENV{dir_name}="usb-%k"

# Determine the mount point
ENV{mount_point}="/mnt/data/supervisor/media/%E{dir_name}"

# Mount the device on 'add' action (a.k.a. plug the USB drive)
ACTION=="add", RUN{program}+="/usr/bin/mkdir -p %E{mount_point}", RUN{program}+="/usr/bin/systemd-mount --no-block --automount=no --collect $devnode %E{mount_point}"

# Umount the device on 'remove' action (a.k.a unplug or eject the USB drive)
ACTION=="remove", ENV{dir_name}!="", RUN{program}+="/usr/bin/systemd-umount %E{mount_point}", RUN{program}+="/usr/bin/rmdir %E{mount_point}"

# Exit
LABEL="abort_rule"

Ok, so since my drive was no longer available, I've tried some things:

1. Disabled all apps using the usb, and deleted the new empty usb-sdb1 folder on the internal drive. Rebooted. No usb-sdb1 or similar folders to be found after reboot.
2. Setup SSH access to Home Assistant OS (Not Core) on port 22222. Found the 80-mount-usb-to-media-by-label.rules rule file at /etc/udev/rules.d and opened it up in vi to be sure it wasn't empty. Didn't read it end-to-end, but it looked familiar so I'm assuming it's working. Dunno if it has to be enabled or activated somehow?
3. Disconnected the drive, and connected it to my Windows PC. It did show up in Diskmanager, but it's making some rather high clicking sounds every now and then. Assuming it's dead.
4. To be sure, I installed Raspbian on a RPi i had lying around. Booted it up and viola, still the clicking sounds and a few errormeassages at boot related to sda1. However, my 5TB usb hdd was right there on the desktop. I tried playing some video files, no problems what-so-ever.

Sooo...what might be causing this drive to not mount on my HA setup?

EDIT: I connected it back, and sure, usb-sdb1 re-appeard in my media directory. I had to reboot the host to get the content back. But I think my HDD is dying, even if it's only 1 year old, and not very much i/o.

@jane-t Did you ever get your issue sorted? I'm having the same problem

Hi,
this might have been a well usable solution, but for me it's not working (Raspberry3, HASSIO version 11.3 docker edition)
After creating the rule in /lib/udev/rules.d and trying the udevadm commands in CLI I was informed this way: zsh: command not found: udevadm. Additionally, the added file disappeared after the next reboot
What is going wrong here?

In the meantime here is some more which might be a solution but I didn't get it working.