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{ config, lib, pkgs, ... }:
with pkgs;
with lib;
let
cfg = config.services.opensmtpd;
conf = writeText "smtpd.conf" cfg.serverConfiguration;
args = concatStringsSep " " cfg.extraServerArgs;
in {
###### interface
options = {
services.opensmtpd = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable the OpenSMTPD server.";
};
extraServerArgs = mkOption {
type = types.listOf types.str;
default = [];
example = [ "-v" "-P mta" ];
description = ''
Extra command line arguments provided when the smtpd process
is started.
'';
};
serverConfiguration = mkOption {
type = types.string;
default = "";
example = ''
listen on lo
accept for any deliver to lmtp localhost:24
'';
description = ''
The contents of the smtpd.conf configuration file. See the
OpenSMTPD documentation for syntax information. If this option
is left empty, the OpenSMTPD server will not start.
'';
};
procPackages = mkOption {
type = types.listOf types.path;
default = [];
description = ''
Packages to search for filters, tables, queues, and schedulers.
Add OpenSMTPD-extras here if you want to use the filters, etc. from
that package.
'';
};
};
};
###### implementation
config = mkIf config.services.opensmtpd.enable {
users.extraGroups = {
smtpd.gid = config.ids.gids.smtpd;
smtpq.gid = config.ids.gids.smtpq;
};
users.extraUsers = {
smtpd = {
description = "OpenSMTPD process user";
uid = config.ids.uids.smtpd;
group = "smtpd";
};
smtpq = {
description = "OpenSMTPD queue user";
uid = config.ids.uids.smtpq;
group = "smtpq";
};
};
systemd.services.opensmtpd = let
procEnv = pkgs.buildEnv {
name = "opensmtpd-procs";
paths = [ opensmtpd ] ++ cfg.procPackages;
pathsToLink = [ "/libexec/opensmtpd" ];
};
in {
wantedBy = [ "multi-user.target" ];
wants = [ "network.target" ];
after = [ "network.target" ];
preStart = "mkdir -p /var/spool";
serviceConfig.ExecStart = "${opensmtpd}/sbin/smtpd -d -f ${conf} ${args}";
environment.OPENSMTPD_PROC_PATH = "${procEnv}/libexec/opensmtpd";
};
environment.systemPackages = [ (pkgs.runCommand "opensmtpd-sendmail" {} ''
mkdir -p $out/bin
ln -s ${opensmtpd}/sbin/smtpctl $out/bin/sendmail
'') ];
};
}
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