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{ config, pkgs, lib, ... }: # mailman.nix
with lib;
let
cfg = config.services.mailman;
pythonEnv = pkgs.python3.withPackages (ps: [ps.mailman]);
mailmanExe = with pkgs; stdenv.mkDerivation {
name = "mailman-" + python3Packages.mailman.version;
unpackPhase = ":";
installPhase = ''
mkdir -p $out/bin
sed >"$out/bin/mailman" <"${pythonEnv}/bin/mailman" \
-e "2 iexport MAILMAN_CONFIG_FILE=/etc/mailman.cfg"
chmod +x $out/bin/mailman
'';
};
mailmanCfg = ''
[mailman]
site_owner: ${cfg.siteOwner}
layout: fhs
[paths.fhs]
bin_dir: ${pkgs.python3Packages.mailman}/bin
var_dir: /var/lib/mailman
queue_dir: $var_dir/queue
log_dir: $var_dir/log
lock_dir: $var_dir/lock
etc_dir: /etc
ext_dir: $etc_dir/mailman.d
pid_file: /run/mailman/master.pid
'';
in {
###### interface
options = {
services.mailman = {
enable = mkOption {
type = types.bool;
default = false;
description = "Enable Mailman on this host. Requires an active Postfix installation.";
};
siteOwner = mkOption {
type = types.str;
default = "postmaster";
description = ''
Certain messages that must be delivered to a human, but which can't
be delivered to a list owner (e.g. a bounce from a list owner), will
be sent to this address. It should point to a human.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
assertions = [
{ assertion = cfg.enable -> config.services.postfix.enable;
message = "Mailman requires Postfix";
}
{ assertion = config.services.postfix.recipientDelimiter == "+";
message = "Postfix's recipientDelimiter must be set to '+'.";
}
];
users.users.mailman = { description = "GNU Mailman"; isSystemUser = true; };
environment = {
systemPackages = [ mailmanExe ];
etc."mailman.cfg".text = mailmanCfg;
};
services.postfix = {
relayDomains = [ "hash:/var/lib/mailman/data/postfix_domains" ];
config = {
transport_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
local_recipient_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
# Mailman uses recipient delimiters, so we don't need special handling.
owner_request_special = "no";
};
};
systemd.services.mailman = {
description = "GNU Mailman Master Process";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${mailmanExe}/bin/mailman start";
ExecStop = "${mailmanExe}/bin/mailman stop";
User = "mailman";
Type = "forking";
StateDirectory = "mailman";
StateDirectoryMode = "0700";
RuntimeDirectory = "mailman";
PIDFile = "/run/mailman/master.pid";
};
};
};
}
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