Udevil & systemd

Systemd broke my USB mounting scripts! Fortunately udevil and devmon are a wonderful replacement.

The way I like USB mounting to work is as follows:

USB storage devices are mounted at /media/filesystem-label
Mountpoints are created with the “storage” group, to allow access to all users in that group.
All users get write access to the mount point
I can specify the mount options I want, especially FAT-based filesystems and NTFS (for fmask/dmask and filename conversion)
Devices get mounted when nobody’s logged in.

Udevil already does a lot of this already with its default configuration. Here’s what I did to finish the job.

Allow write access to members of the mountpoint group (ie storage group)

- In /etc/udevil/udevil.conf change the fmask and dmask options to +fmask=0002+ and +dmask=0002+ for the filesystems that have them specified.
- In /etc/udevil/udevil.conf change the allowed fmask and dmask options to +fmask=0002+ and +dmask=0002+
- In /etc/udevil/udevil.conf change the mount point mode to 0775

Devmon is shipped with udevil, and it comes with a systemd unit file.

First, create a devmon user to run devmon under.

# useradd -g storage -M -u 300 devmon
# usermod -L devmon

Enable and start devmon (the unit file is named devmon@ and requires a username after the @)

# systemctl enable devmon@devmon
# systemctl start devmon@devmon