111 lines
2.5 KiB
Nix
111 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkIf mkOption singleton types;
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inherit (pkgs) coreutils exim;
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cfg = config.services.exim;
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in
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{
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###### interface
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options = {
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services.exim = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable the Exim mail transfer agent.";
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};
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config = mkOption {
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type = types.string;
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default = "";
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description = ''
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Verbatim Exim configuration. This should not contain exim_user,
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exim_group, exim_path, or spool_directory.
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'';
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};
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user = mkOption {
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type = types.string;
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default = "exim";
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description = ''
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User to use when no root privileges are required.
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In particular, this applies when receiving messages and when doing
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remote deliveries. (Local deliveries run as various non-root users,
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typically as the owner of a local mailbox.) Specifying this value
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as root is not supported.
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'';
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};
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group = mkOption {
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type = types.string;
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default = "exim";
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description = ''
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Group to use when no root privileges are required.
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'';
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};
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spoolDir = mkOption {
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type = types.string;
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default = "/var/spool/exim";
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description = ''
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Location of the spool directory of exim.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment = {
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etc."exim.conf".text = ''
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exim_user = ${cfg.user}
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exim_group = ${cfg.group}
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exim_path = /run/wrappers/bin/exim
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spool_directory = ${cfg.spoolDir}
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${cfg.config}
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'';
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systemPackages = [ exim ];
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};
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users.extraUsers = singleton {
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name = cfg.user;
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description = "Exim mail transfer agent user";
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uid = config.ids.uids.exim;
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group = cfg.group;
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};
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users.extraGroups = singleton {
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name = cfg.group;
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gid = config.ids.gids.exim;
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};
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security.setuidPrograms = [ "exim" ];
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systemd.services.exim = {
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description = "Exim Mail Daemon";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${exim}/bin/exim -bdf -q30m";
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ExecReload = "${coreutils}/bin/kill -HUP $MAINPID";
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};
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preStart = ''
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if ! test -d ${cfg.spoolDir}; then
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${coreutils}/bin/mkdir -p ${cfg.spoolDir}
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${coreutils}/bin/chown ${cfg.user}:${cfg.group} ${cfg.spoolDir}
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fi
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'';
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};
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};
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}
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