119c8f91e7
Setting nixosVersion to something custom is useful for meaningful GRUB menus and /nix/store paths, but actuallly changing it rebulids the whole system path (because of `nixos-version` script and manual pages). Also, changing it is not a particularly good idea because you can then be differentitated from other NixOS users by a lot of programs that read /etc/os-release. This patch introduces an alternative option that does all you want from nixosVersion, but rebuilds only the very top system level and /etc while using your label in the names of system /nix/store paths, GRUB and other boot loaders' menus, getty greetings and so on.
108 lines
3.1 KiB
Nix
108 lines
3.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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autologinArg = optionalString (config.services.mingetty.autologinUser != null) "--autologin ${config.services.mingetty.autologinUser}";
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gettyCmd = extraArgs: "@${pkgs.utillinux}/sbin/agetty agetty --login-program ${pkgs.shadow}/bin/login ${autologinArg} ${extraArgs}";
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in
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{
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###### interface
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options = {
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services.mingetty = {
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autologinUser = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Username of the account that will be automatically logged in at the console.
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If unspecified, a login prompt is shown as usual.
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'';
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};
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greetingLine = mkOption {
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type = types.str;
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description = ''
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Welcome line printed by mingetty.
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The default shows current NixOS version label, machine type and tty.
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'';
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};
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helpLine = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Help line printed by mingetty below the welcome line.
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Used by the installation CD to give some hints on
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how to proceed.
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'';
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};
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serialSpeed = mkOption {
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type = types.listOf types.int;
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default = [ 115200 57600 38400 9600 ];
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example = [ 38400 9600 ];
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description = ''
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Bitrates to allow for agetty's listening on serial ports. Listing more
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bitrates gives more interoperability but at the cost of long delays
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for getting a sync on the line.
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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 = {
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# Note: this is set here rather than up there so that changing
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# nixosLabel would not rebuild manual pages
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services.mingetty.greetingLine = mkDefault ''<<< Welcome to NixOS ${config.system.nixosLabel} (\m) - \l >>>'';
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systemd.services."getty@" =
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{ serviceConfig.ExecStart = gettyCmd "--noclear --keep-baud %I 115200,38400,9600 $TERM";
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restartIfChanged = false;
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};
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systemd.services."serial-getty@" =
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{ serviceConfig.ExecStart =
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let speeds = concatStringsSep "," (map toString config.services.mingetty.serialSpeed);
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in gettyCmd "%I ${speeds} $TERM";
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restartIfChanged = false;
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};
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systemd.services."container-getty@" =
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{ unitConfig.ConditionPathExists = "/dev/pts/%I"; # Work around being respawned when "machinectl login" exits.
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serviceConfig.ExecStart = gettyCmd "--noclear --keep-baud pts/%I 115200,38400,9600 $TERM";
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restartIfChanged = false;
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};
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systemd.services."console-getty" =
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{ serviceConfig.ExecStart = gettyCmd "--noclear --keep-baud console 115200,38400,9600 $TERM";
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serviceConfig.Restart = "always";
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restartIfChanged = false;
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enable = mkDefault config.boot.isContainer;
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};
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environment.etc = singleton
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{ # Friendly greeting on the virtual consoles.
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source = pkgs.writeText "issue" ''
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[1;32m${config.services.mingetty.greetingLine}[0m
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${config.services.mingetty.helpLine}
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'';
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target = "issue";
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};
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};
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}
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