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nixos: introduce system.nixosLabel option and use it where appropriate

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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.
This commit is contained in:
Jan Malakhovski
2016-01-08 22:26:15 +00:00
parent 732eb3c4cc
commit 119c8f91e7
10 changed files with 52 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
nixos/modules/services/ttys/agetty.nix
+14 -6
View File
@@ -2,6 +2,13 @@
with lib;
let
autologinArg = optionalString (config.services.mingetty.autologinUser != null) "--autologin ${config.services.mingetty.autologinUser}";
gettyCmd = extraArgs: "@${pkgs.utillinux}/sbin/agetty agetty --login-program ${pkgs.shadow}/bin/login ${autologinArg} ${extraArgs}";
in
{
###### interface
@@ -21,9 +28,9 @@ with lib;
greetingLine = mkOption {
type = types.str;
default = ''<<< Welcome to NixOS ${config.system.nixosVersion} (\m) - \l >>>'';
description = ''
Welcome line printed by mingetty.
The default shows current NixOS version label, machine type and tty.
'';
};
@@ -55,10 +62,11 @@ with lib;
###### implementation
config = let
autologinArg = optionalString (config.services.mingetty.autologinUser != null) "--autologin ${config.services.mingetty.autologinUser}";
gettyCmd = extraArgs: "@${pkgs.utillinux}/sbin/agetty agetty --login-program ${pkgs.shadow}/bin/login ${autologinArg} ${extraArgs}";
in {
config = {
# Note: this is set here rather than up there so that changing
# nixosLabel would not rebuild manual pages
services.mingetty.greetingLine = mkDefault ''<<< Welcome to NixOS ${config.system.nixosLabel} (\m) - \l >>>'';
systemd.services."getty@" =
{ serviceConfig.ExecStart = gettyCmd "--noclear --keep-baud %I 115200,38400,9600 $TERM";
restartIfChanged = false;
@@ -81,7 +89,7 @@ with lib;
{ serviceConfig.ExecStart = gettyCmd "--noclear --keep-baud console 115200,38400,9600 $TERM";
serviceConfig.Restart = "always";
restartIfChanged = false;
enable = mkDefault config.boot.isContainer;
enable = mkDefault config.boot.isContainer;
};
environment.etc = singleton