nix-bitcoin/modules/clightning.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.clightning;
configFile = pkgs.writeText "config" ''
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autolisten=${if cfg.autolisten then "true" else "false"}
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network=bitcoin
bitcoin-rpcuser=${cfg.bitcoin-rpcuser}
'';
in {
options.services.clightning = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the clightning service will be installed.
'';
};
autolisten = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the clightning service will listen.
'';
};
bitcoin-rpcuser = mkOption {
type = types.string;
description = ''
Bitcoin RPC user
'';
};
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dataDir = mkOption {
type = types.path;
default = "/var/lib/clightning";
description = "The data directory for clightning.";
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};
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};
config = mkIf cfg.enable {
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users.users.clightning = {
description = "clightning User";
group = "clightning";
extraGroups = [ "bitcoinrpc" "keys" ];
home = cfg.dataDir;
};
users.groups.clightning = {
name = "clightning";
};
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systemd.services.clightning = {
description = "Run clightningd";
path = [ pkgs.bitcoin ];
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
preStart = ''
mkdir -m 0770 -p ${cfg.dataDir}
rm -f ${cfg.dataDir}/config
chown 'clightning:clightning' '${cfg.dataDir}'
cp ${configFile} ${cfg.dataDir}/config
chown 'clightning:clightning' '${cfg.dataDir}/config'
chmod +w ${cfg.dataDir}/config
chmod o-rw ${cfg.dataDir}/config
# The RPC socket has to be removed otherwise we might have stale sockets
rm -f ${cfg.dataDir}/lightning-rpc
echo "bitcoin-rpcpassword=$(cat /secrets/bitcoin-rpcpassword)" >> '${cfg.dataDir}/config'
'';
serviceConfig = {
PermissionsStartOnly = "true";
ExecStart = "${pkgs.clightning}/bin/lightningd --lightning-dir=${cfg.dataDir}";
User = "clightning";
Restart = "on-failure";
RestartSec = "10s";
PrivateTmp = "true";
ProtectSystem = "full";
NoNewPrivileges = "true";
PrivateDevices = "true";
MemoryDenyWriteExecute = "true";
};
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};
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};
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}