stockholm/krebs/3modules/os-release.nix

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Nix
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{ config, lib, ... }:
with lib;
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let
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nixos-version-id = if (hasAttr "nixos" config.system) then
"${config.system.nixos.version}" else "${config.system.nixosVersion}";
nixos-codeName = if (hasAttr "nixos" config.system) then
"${config.system.nixos.codeName}" else "${config.system.nixosCodeName}";
nixos-version = "${nixos-version-id} (${nixos-codeName})";
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nixos-pretty-name = "NixOS ${nixos-version}";
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stockholm-version-id = let
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eval = builtins.tryEval (removeSuffix "\n" (readFile <stockholm-version>));
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in
if eval.success then eval.value else "unknown";
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stockholm-version = "${stockholm-version-id}";
stockholm-pretty-name = "stockholm ${stockholm-version}";
version = "${stockholm-version}/${nixos-version}";
version-id = "${stockholm-version-id}/${nixos-version-id}";
pretty-name = "${stockholm-pretty-name} / ${nixos-pretty-name}";
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home-url = http://cgit.ni.krebsco.de/stockholm;
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in
{
# http://0pointer.de/public/systemd-man/os-release.html
environment.etc."os-release".text = mkForce ''
NAME="stockholm/NixOS"
ID=stockholm
VERSION="${version}"
VERSION_ID="${version-id}"
PRETTY_NAME="${pretty-name}"
HOME_URL="${home-url}"
'';
}