nixpkgs/nixos/modules/services/network-filesystems/rsyncd.nix

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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.rsyncd;
motdFile = builtins.toFile "rsyncd-motd" cfg.motd;
moduleConfig = name:
let module = getAttr name cfg.modules; in
"[${name}]\n " + (toString (
map
(key: "${key} = ${toString (getAttr key module)}\n")
(attrNames module)
));
cfgFile = builtins.toFile "rsyncd.conf"
''
${optionalString (cfg.motd != "") "motd file = ${motdFile}"}
${optionalString (cfg.address != "") "address = ${cfg.address}"}
${optionalString (cfg.port != 873) "port = ${toString cfg.port}"}
${cfg.extraConfig}
${toString (map moduleConfig (attrNames cfg.modules))}
'';
in
{
options = {
services.rsyncd = {
enable = mkOption {
default = false;
description = "Whether to enable the rsync daemon.";
};
motd = mkOption {
type = types.string;
default = "";
description = ''
Message of the day to display to clients on each connect.
This usually contains site information and any legal notices.
'';
};
port = mkOption {
default = 873;
type = types.int;
description = "TCP port the daemon will listen on.";
};
address = mkOption {
default = "";
example = "192.168.1.2";
description = ''
IP address the daemon will listen on; rsyncd will listen on
all addresses if this is not specified.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Lines of configuration to add to rsyncd globally.
See <command>man rsyncd.conf</command> for options.
'';
};
modules = mkOption {
default = {};
description = ''
A set describing exported directories.
See <command>man rsyncd.conf</command> for options.
'';
type = types.attrsOf (types.attrsOf types.str);
example =
{ srv =
{ path = "/srv";
"read only" = "yes";
comment = "Public rsync share.";
};
};
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.etc = singleton {
source = cfgFile;
target = "rsyncd.conf";
};
systemd.services.rsyncd = {
description = "Rsync daemon";
wantedBy = [ "multi-user.target" ];
serviceConfig.ExecStart = "${pkgs.rsync}/bin/rsync --daemon --no-detach";
};
};
}