haccfiles/modules/buildinfo.nix

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{ config, lib, pkgs, sources, ... }:
let
self = sources.self;
formatDate = date: with lib.strings;
let
year = substring 0 4 date;
month = substring 4 2 date;
day = substring 6 2 date;
hour = substring 8 2 date;
minute = substring 10 2 date;
second = substring 12 2 date;
in
"${year}-${month}-${day} ${hour}:${minute}:${second} UTC";
in
{
system.nixos.label = "${config.system.nixos.release}-haccfiles-${self.shortRev or self.dirtyShortRev}";
users.motd = ''
Welcome to ${config.networking.hostName}, running NixOS ${config.system.nixos.release}!
Built from haccfiles ${self.rev or self.dirtyRev}.
Last commit was at ${formatDate self.lastModifiedDate}.
${if self ? dirtyRev then "\nPlease remember to commit your changes.\n" else ""}
'';
# used by monit
environment.etc."haccfiles-commit".text = self.rev or self.dirtyRev;
environment.etc."haccfiles-timestamp".text = builtins.toString self.lastModified;
}