nix-configurations/hosts/m3-nix/services/tailscale.nix

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{ config, pkgs, ... }: {
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services.tailscale = {
enable = true;
useRoutingFeatures = "client";
};
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systemd.services.tailscale-autoconnect = {
description = "Automatic connection to Tailscale";
# make sure tailscale is running before trying to connect to tailscale
after = [ "network-pre.target" "tailscale.service" ];
wants = [ "network-pre.target" "tailscale.service" ];
wantedBy = [ "multi-user.target" ];
# set this service as a oneshot job
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serviceConfig = {
Type = "oneshot";
EnvironmentFile = "${config.age.secrets.tailscale-key.path}";
};
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# have the job run this shell script
script = with pkgs; ''
# wait for tailscaled to settle
sleep 2
# check if we are already authenticated to tailscale
status="$(${tailscale}/bin/tailscale status -json | ${jq}/bin/jq -r .BackendState)"
if [ $status = "Running" ]; then # if so, then do nothing
exit 0
fi
# otherwise authenticate with tailscale
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${tailscale}/bin/tailscale up --exit-node 100.88.96.77 --authkey $TAILSCALE_KEY
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'';
};
}