nix-bitcoin/modules/clightning.nix
2020-05-22 16:16:17 +00:00

131 lines
4.3 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.clightning;
inherit (config) nix-bitcoin-services;
configFile = pkgs.writeText "config" ''
autolisten=${if cfg.autolisten then "true" else "false"}
network=bitcoin
bitcoin-datadir=${config.services.bitcoind.dataDir}
${optionalString (cfg.proxy != null) "proxy=${cfg.proxy}"}
always-use-proxy=${if cfg.always-use-proxy then "true" else "false"}
${optionalString (cfg.bind-addr != null) "bind-addr=${cfg.bind-addr}"}
bitcoin-rpcuser=${cfg.bitcoin-rpcuser}
rpc-file-mode=0660
'';
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.
'';
};
proxy = mkOption {
type = types.nullOr types.str;
default = null;
description = "Set a socks proxy to use to connect to Tor nodes (or for all connections if *always-use-proxy* is set)";
};
always-use-proxy = mkOption {
type = types.bool;
default = false;
description = ''
Always use the *proxy*, even to connect to normal IP addresses (you can still connect to Unix domain sockets manually). This also disables all DNS lookups, to avoid leaking information.
'';
};
bind-addr = mkOption {
type = types.nullOr types.str;
default = null;
description = "Set an IP address or UNIX domain socket to listen to";
};
bitcoin-rpcuser = mkOption {
type = types.str;
description = ''
Bitcoin RPC user
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/clightning";
description = "The data directory for clightning.";
};
user = mkOption {
type = types.str;
default = "clightning";
description = "The user as which to run clightning.";
};
group = mkOption {
type = types.str;
default = cfg.user;
description = "The group as which to run clightning.";
};
cli = mkOption {
readOnly = true;
default = pkgs.writeScriptBin "lightning-cli"
''
${pkgs.nix-bitcoin.clightning}/bin/lightning-cli --lightning-dir='${cfg.dataDir}' "$@"
'';
description = "Binary to connect with the clightning instance.";
};
enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.nix-bitcoin.clightning (hiPrio cfg.cli) ];
users.users.${cfg.user} = {
description = "clightning User";
group = cfg.group;
extraGroups = [ "bitcoinrpc" ];
};
users.groups.${cfg.group} = {};
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -"
];
systemd.services.clightning = {
description = "Run clightningd";
path = [ pkgs.nix-bitcoin.bitcoind ];
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
preStart = ''
cp ${configFile} ${cfg.dataDir}/config
chown -R '${cfg.user}:${cfg.group}' '${cfg.dataDir}'
# The RPC socket has to be removed otherwise we might have stale sockets
rm -f ${cfg.dataDir}/bitcoin/lightning-rpc
chmod 600 ${cfg.dataDir}/config
echo "bitcoin-rpcpassword=$(cat ${config.nix-bitcoin.secretsDir}/bitcoin-rpcpassword)" >> '${cfg.dataDir}/config'
'';
serviceConfig = nix-bitcoin-services.defaultHardening // {
ExecStart = "${pkgs.nix-bitcoin.clightning}/bin/lightningd --lightning-dir=${cfg.dataDir}";
User = "${cfg.user}";
Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${cfg.dataDir}";
} // (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
);
# Wait until the rpc socket appears
postStart = ''
while [[ ! -e ${cfg.dataDir}/bitcoin/lightning-rpc ]]; do
sleep 0.1
done
# Needed to enable lightning-cli for users with group 'clightning'
chmod g+x ${cfg.dataDir}/bitcoin
'';
};
};
}