Hi everyone I'm currently in the process to move one of my RPI4s from RaspberryOS to NixOS and I'm struggling to setup one of the services.
On the RPI I have a python script that is creating offsite backups via a Wireguard tunnel:
- Open the wg tunnel
- mount and encrypt the external disk on the offsite RPI
- mount the source from my nas
- start the restic-rest server container offsite
- trigger the restic command to backup to the restic repo
allthough it's a bit overkill it works quite well for a few years now. Since most of the tasks are actually outsourced to systemd units those where quite easy to setup in nixOS. What I'm struggling is, how can I create a virtual python env to run the python script. All the guides I found for managing python dependencies are usually for development and use nix shell
My current workaround is, that I copy the script and requirements.txt from my script repo and create the venv manually. This does work, but I feel there is a better way, maybe the whole setup is already on the wrong pat as I tried to solve each hurdle separately?
Here's my current implementation of the remotebackup module (the wireguard and mount units are in different modules):
{inputs, config, pkgs, lib, ... }:
let configpath = builtins.toString inputs.infra-configs;
in
{
systemd.tmpfiles.settings = {
"remotebackup" = {
"/var/lib/remotebackup" = {
d = {
group = "root";
user = "root";
mode = "755";
};
};
"/var/lib/remotebackup/assets" = {
d = {
group = "root";
user = "root";
mode = "755";
};
};
};
};
sops.secrets = {
"restic/remotebackup/rest" = {};
"restic/remotebackup/restic" = {};
};
sops.templates."remotebackup" = {
content = ''
{
"rest" : "${config.sops.placeholder."restic/remotebackup/rest"}",
"restic": "${config.sops.placeholder."restic/remotebackup/restic"}",
}
'';
path = "/var/lib/remotebackup/assets/restic.cred";
};
system.activationScripts.addPythonScript = lib.stringAfter ["var"] ''
cp ${configpath}/scripts/remotebackup/script/restic_remotebackup.py /var/lib/remotebackup/restic_remotebackup.py
cp ${configpath}/scripts/remotebackup/script/requirements.txt /var/lib/remotebackup/requirements.txt
chmod 733 /var/lib/remotebackup/restic_remotebackup.py
cp ${configpath}/scripts/remotebackup/script/assets/backup_paths.txt /var/lib/remotebackup/assets/backup_paths.txt
'';
}
Also, on the RPI I'm triggering the script with cron, according to the wiki cron should be replaced by systemd.timers. Would you also suggest moving to systemd.timers
P.S.: If at all possible, I'd like to keep the script within my script repo...
From the article: