Automount USB external drives with udev rules and systemd workaround #udev #automount #usb #systemd #gentoo

autoumount_udev_systemd.org

Automount USB external drives with udev rules and systemd workarounds

Generate /etc/udev/rules.d/11-media-by-label-auto-mount.rules with the following content

KERNEL!="sd[a-z][0-9]", GOTO="media_by_label_auto_mount_end"  
# Import FS infos  
IMPORT{program}="/sbin/blkid -o udev -p %N"  
# Get a label if present, otherwise specify one  
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"  
ENV{ID_FS_LABEL}=="", ENV{dir_name}="usbhd-%k"  
# Global mount options  
ACTION=="add", ENV{mount_options}="relatime"  
# Filesystem-specific mount options  
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs", ENV{mount_options}="$env{mount_options},utf8,gid=100,umask=002"  
# Mount the device  
ACTION=="add", RUN+="/bin/mkdir -p /media/%E{dir_name}", RUN+="/bin/mount -o $env{mount_options} /dev/%k /media/%E{dir_name}"  
# 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"

Open /lib/systemd/system/systemd-udev.service

Replace PrivateMount=yes –> PrivateMount=no

Add MountFlags=shared in the [service] section

Remove SystemCallFilter=@system-service @module @raw-io

Restart systemd-udevd service

Alternative (not tried)

https://www.andreafortuna.org/2019/06/26/automount-usb-devices-on-linux-using-udev-and-systemd/

seems like the "right way" is to avoid using mount inside udev rules

and use systemd-mount instead

https://wiki.archlinux.org/title/Udev#Mounting_drives_in_rules

Thanks for the tip @kcris

thank you! your script was useful!