nix-bitcoin/modules/electrs.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.electrs;
in {
options.services.electrs = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the electrs service will be installed.
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/electrs";
description = "The data directory for electrs.";
};
};
config = mkIf cfg.enable {
users.users.electrs = {
description = "electrs User";
group = "electrs";
extraGroups = [ "bitcoinrpc" "keys" ];
home = cfg.dataDir;
};
users.groups.electrs = {
name = "electrs";
};
systemd.services.electrs = {
description = "Run electrs";
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
# create shell script to start up electrs safely with password parameter
preStart = ''
mkdir -m 0770 -p ${cfg.dataDir}
chown 'electrs:electrs' ${cfg.dataDir}
echo "${pkgs.electrs}/bin/electrs -vvv --timestamp --db-dir ${cfg.dataDir} --daemon-dir /var/lib/bitcoind --cookie=${config.services.bitcoind.rpcuser}:$(cat /secrets/bitcoin-rpcpassword)" > /var/lib/electrs/startscript.sh
chown -R 'electrs:electrs' ${cfg.dataDir}
chmod u+x ${cfg.dataDir}/startscript.sh
'';
serviceConfig = {
PermissionsStartOnly = "true";
ExecStart = "${pkgs.bash}/bin/bash ${cfg.dataDir}/startscript.sh";
User = "electrs";
Restart = "on-failure";
RestartSec = "10s";
PrivateTmp = "true";
ProtectSystem = "full";
NoNewPrivileges = "true";
PrivateDevices = "true";
};
};
};
}