Dangerflask: Add unmissable warning to draw attention to the Greater-than Sign not rendering properly

2026-02-20T06:07:14Z

Add unmissable warning to draw attention to the Greater-than Sign not rendering properly

← Older revision		Revision as of 06:07, 20 February 2026
Line 81:		Line 81:
	if [ ! -r "$HOME/.vnc/passwd" ]; then		if [ ! -r "$HOME/.vnc/passwd" ]; then
	echo "ERROR: Run: vncpasswd ~/.vnc/passwd" >&2		echo "ERROR: Run: vncpasswd ~/.vnc/passwd" >&2
			### CHANGE THE > in the above line TO A GREATER THAN SIGN! ###
	exit 1		exit 1
	fi		fi

Johanno: Explain how to configure a systemd service in a configuration nix import

2026-02-13T23:12:23Z

Explain how to configure a systemd service in a configuration nix import

New page

In order to get TigerVNC to run on nixos without further hassle you can use the following config.
(AI was heavily used to create it)

{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{
imports = [
./tigervnc.nix
];

### tigervnc
services.xserver.enable = true; # Prerequisite

services.tigervnc = {
enable = true;
users = {
YOURUSERNAME = {
localhost = false; # true for SSH-only
};
};
};
### tigervnc END
}
</nowiki>}}

Here you need to replace all <code>YOURUSERNAME</code> with your user name.

Now the tigervnc file to import.

{{file|/etc/nixos/tigervnc.nix|nix|<nowiki>
{ config, pkgs, lib, ... }:

let
cfg = config.services.tigervnc;
in
{
options.services.tigervnc = {
enable = lib.mkEnableOption "TigerVNC x0vncserver (mirrors :0)";
users = lib.mkOption {
type = lib.types.attrsOf (lib.types.submodule ({ name, config, ... }: {
options = {
enableSharing = lib.mkOption { type = lib.types.bool; default = true; };
port = lib.mkOption { type = lib.types.int; default = 5901; };
localhost = lib.mkOption { type = lib.types.bool; default = false; };
#geometry = lib.mkOption { type = lib.types.str; default = ""; };
};
}));
default = { };
};
};

config = lib.mkIf cfg.enable {
environment.systemPackages = [ pkgs.tigervnc pkgs.xorg.xhost pkgs.xorg.xauth ];

systemd.user.services = lib.mapAttrs' (user: opts:
let svcName = "tigervnc-x0vncserver-${user}";
in {
name = svcName;
value = lib.mkIf opts.enableSharing {
description = "TigerVNC x0vncserver sharing :0 for ${user}";
after = [ "graphical-session.target" ];
partOf = [ "graphical-session.target" ];
wantedBy = [ "graphical-session.target" ];

path = [ pkgs.tigervnc pkgs.xorg.xhost pkgs.xorg.xauth pkgs.coreutils ];

script = let
# Build args array to avoid shell escaping hell
vncArgs = [
"-display :0"
"-rfbport ${toString opts.port}"
"-rfbauth $HOME/.vnc/passwd"
"-AcceptSetDesktopSize=0"
"-AlwaysShared"
] #++ lib.optionals (opts.geometry != "") [ "-Geometry ${opts.geometry}" ]
++ lib.optionals opts.localhost [ "-localhost" ];
in ''
set -euxo pipefail

# Password check
mkdir -p "$HOME/.vnc"
if [ ! -r "$HOME/.vnc/passwd" ]; then
echo "ERROR: Run: vncpasswd ~/.vnc/passwd" >&2
exit 1
fi

# X authority
xhost +local:

# Clean x0vncserver args
${pkgs.tigervnc}/bin/x0vncserver ${lib.concatStringsSep " " (map (arg: "${arg}") vncArgs)}
'';

preStop = ''
xhost -local:
pkill -f "x0vncserver.*${toString opts.port}"
'';

serviceConfig = {
Type = "simple";
Restart = "always";
RestartSec = "5s";
RuntimeDirectory = "vnc-${user}";
};
};
}
) cfg.users;

networking.firewall.allowedTCPPorts =
lib.mapAttrsToList (_: opts: opts.port) cfg.users;
};
}

</nowiki>}}

For an initial setup you need to set your password with <code>vncpasswd</code>

I had issues due to an existing .vnc folder so I did:
<code>echo "YOUR_PW" | vncpasswd -f > ~/.vnc/passwd</code>

TigerVNC - Revision history

Dangerflask: Add unmissable warning to draw attention to the Greater-than Sign not rendering properly

Johanno: Explain how to configure a systemd service in a configuration nix import