bug: nixos/autossh: Failed to determine user credentials: No such process

[WillPower3309]

Describe the bug

The autossh module has the following issue when building, if setting user to the name of a non pre-existing user:

Jan 11 15:15:54 server systemd[1]: Started AutoSSH session (plex-tunnel).
Jan 11 15:15:54 server (autossh)[288520]: autossh-plex-tunnel.service: Failed to determine user credentials: No such process
Jan 11 15:15:54 server (autossh)[288520]: autossh-plex-tunnel.service: Failed at step USER spawning /nix/store/hklrrlwx6j75ba6pidkw13qq7dy5djix-autossh-1.4g/bin/autossh: No such process
Jan 11 15:15:54 server systemd[1]: autossh-plex-tunnel.service: Main process exited, code=exited, status=217/USER
Jan 11 15:15:54 server systemd[1]: autossh-plex-tunnel.service: Failed with result 'exit-code'.
the following new units were started: local-fs.target, remote-fs.target
warning: the following units failed: autossh-plex-tunnel.service

Steps to reproduce

Steps to reproduce the behavior:

1. use a basic autossh config, with a new user, such as:

    autossh.sessions = [{
      extraArguments = "";
      monitoringPort = 32400;
      name = "plex-tunnel";
      user = "plex-tunnel";
    }];

2. try to build the config

Metadata

• system: "x86_64-linux"
• host os: Linux 6.6.52, NixOS, 24.11 (Vicuna), 24.11.20240925.fe866c6
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.18.7
• nixpkgs: /nix/store/p278fw1vxcvf6vp93bd8sqmimvl9b5ws-source

Notes

Related fix for immich module: #345126

The fix for this is likely just to create the user if it doesn't exist as is done in other modules