Document right settings of shared cache might not be presistent after reboot

[hagenw]

In the documentation for the shared cache folder, we propose at the moment to execute the following steps to share the folder with several persons:

The problem is that the setfacl command might not result in persistent settings, compare https://unix.stackexchange.com/q/372244.

One approach might be to write a /etc/systemd/system/audb.service script that applies the settings after reboot:

# https://unix.stackexchange.com/a/372510
[Unit]
Description=audb shared cache rights
Requires=local-fs.target
After=local-fs.target

[Service]
ExecStart=/usr/bin/setfacl -R -d -m u::rwx,o::rx- /data/audb

[Install]
WantedBy=multi-user.target

And enable it with:

$ sudo systemctl enable audb.service