tvl-depot/ops/modules/smtprelay.nix

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# NixOS module for configuring the simple SMTP relay.
{ depot, pkgs, config, lib, ... }:
let
inherit (builtins) attrValues mapAttrs;
inherit (lib)
concatStringsSep
mkEnableOption
mkIf
mkOption
types
;
cfg = config.services.depot.smtprelay;
description = "Simple SMTP relay";
# Configuration values that are always overridden.
#
# - logging is pinned to stdout for journald compatibility
# - secret config is loaded through systemd's credential loading facility
overrideArgs = {
logfile = "";
config = "$CREDENTIALS_DIRECTORY/secrets";
};
# Creates the command line argument string for the service.
prepareArgs = args:
concatStringsSep " "
(attrValues (mapAttrs (key: value: "-${key} \"${toString value}\"")
(args // overrideArgs)));
in
{
options.services.depot.smtprelay = {
enable = mkEnableOption description;
args = mkOption {
type = types.attrsOf types.str;
description = "Key value pairs for command line arguments";
};
secretsFile = mkOption {
type = types.str;
default = config.age.secretsDir + "/smtprelay";
};
};
config = mkIf cfg.enable {
systemd.services.smtprelay = {
inherit description;
script = "${depot.third_party.smtprelay}/bin/smtprelay ${prepareArgs cfg.args}";
wantedBy = [ "multi-user.target" ];
serviceConfig = {
Restart = "always";
StateDirectory = "smtprelay";
DynamicUser = true;
LoadCredential = "secrets:${cfg.secretsFile}";
};
};
};
}