dotfiles/nixos/tailscale/default.nix

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{
config,
pkgs,
inputs,
...
}: let
inherit
(inputs.nixpkgs-nixos-unstable.legacyPackages."x86_64-linux")
tailscale
;
in {
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environment.systemPackages = [tailscale];
services.tailscale = {
enable = true;
package = tailscale;
};
networking.firewall = {
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trustedInterfaces = ["tailscale0"];
allowedUDPPorts = [config.services.tailscale.port];
};
sops.secrets."tailscale-key-${config.networking.hostName}" = {
sopsFile = ./keys.sops.yaml;
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restartUnits = ["tailscale-auth.service"];
};
systemd.services.tailscale-auth = {
description = "Auth with tailscale";
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after = ["network-pre.target" "tailscale.service"];
wants = ["network-pre.target" "tailscale.service"];
wantedBy = ["multi-user.target"];
serviceConfig.Type = "oneshot";
script = ''
sleep 2
status="$(${tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
if [ $status = "Running" ]; then # if so, then do nothing
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echo "already connected"
exit 0
fi
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echo "$status, reauthing"
${tailscale}/bin/tailscale up --authkey `cat /run/secrets/tailscale-key-${config.networking.hostName}`
'';
};
}