Overlay writable overlayFS on top of read-only Stud.IP FUSE

studip-overlay.sh

#!/bin/bash

# Allow root access to FUSE devices mounted with -o allow_root option
# see https://blog.oxplot.com/allow-root-access-fuse-mount/
echo "user_allow_other" >> /etc/fuse.conf

cd ~user/studip

# Start studip-fuse in background and mount at ~user/studip/lower
studip-fuse --user user12 --format "{semester-lexical}/{course}/{type}/{short-path}/{name}" --mount ./lower --allowroot &

# Create sibling directories for overlayFS
mkdir upper work merged

# Mount overlayFS kernel driver, 
# - using "lower" directory from studip-fuse as read-only lower layer, 
# - writing changes to regular "upper" directory, 
# - storing config in regular "work" directory, 
# - and providing access to the merged directory tree (i.e. mounted) under "merged".
# see https://wiki.archlinux.org/index.php/Overlay_filesystem
mount -vt overlay overlay -o lowerdir=lower,upperdir=upper,workdir=work,redirect_dir=on merged

To unmount:

fusermount -u lower
sudo umount merged