nix-bitcoin/modules/clightning.nix
Erik Arvstedt 86167c6e6d
clightning: wait until the RPC socket appears
This fixes failures with spark-wallet which requires clightning RPC
2020-01-12 20:02:02 +01:00

117 lines
4.0 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
${optionalString (cfg.proxy != null) "proxy=${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}
'';
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.";
};
cli = mkOption {
readOnly = true;
default = pkgs.writeScriptBin "lightning-cli"
# Switch user because c-lightning doesn't allow setting the permissions of the rpc socket
# https://github.com/ElementsProject/lightning/issues/1366
''
exec sudo -u clightning ${pkgs.nix-bitcoin.clightning}/bin/lightning-cli --lightning-dir='${cfg.dataDir}' "$@"
'';
description = "Binary to connect with the clightning instance.";
};
enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable {
users.users.clightning = {
description = "clightning User";
group = "clightning";
extraGroups = [ "bitcoinrpc" ];
home = cfg.dataDir;
};
users.groups.clightning = {};
systemd.services.clightning = {
description = "Run clightningd";
path = [ pkgs.nix-bitcoin.bitcoind ];
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
preStart = ''
mkdir -m 0770 -p ${cfg.dataDir}
cp ${configFile} ${cfg.dataDir}/config
chown -R 'clightning:clightning' '${cfg.dataDir}'
# give group read access to allow using lightning-cli
chmod u=rw,g=r,o= ${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.nix-bitcoin.clightning}/bin/lightningd --lightning-dir=${cfg.dataDir}";
User = "clightning";
Restart = "on-failure";
RestartSec = "10s";
} // nix-bitcoin-services.defaultHardening
// (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
);
# Wait until the rpc socket appears
postStart = ''
while read f; do [[ $f == lightning-rpc ]] && break; done \
< <(${pkgs.inotifyTools}/bin/inotifywait --quiet --monitor -e create,moved_to --format '%f' '${cfg.dataDir}')
'';
};
};
}