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swarm-ui: apply the operator's stylix theme, same as the dashboard already does

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mara: "swarm dash is in my own colors, but tab colors on swarm ui are
the default catpucchin one." Root cause: hive-c0re/theme.nix's stylix
overlay only ever wrote a themed colors.css onto the dashboard/agent
frontend subtrees -- swarm-ui, served from its own separate package,
was never in scope.

Extracts the stylix-detection + colors.css-generation logic (previously
inline in theme.nix) into a shared nix/host-modules/stylix-theme.nix,
imported by both theme.nix and swarm-ui.nix -- one source instead of a
second copy that has to agree by inspection. swarm-ui.nix gains its own
themedPackage overlay (same shape as theme.nix's themedFrontend: copy
the package, overwrite static/colors.css) and serves that instead of
cfg.package directly when stylix is active; a clean passthrough
otherwise.

Verified with a throwaway nixosSystem eval (this repo's own flake
checks do not exercise gateway-module wiring) confirming the unthemed
path resolves cfg.package unchanged.
This commit is contained in:
iris 2026-08-24 12:41:49 +02:00 • committed by mara
commit 2ecf842a1b
3 changed files with 87 additions and 28 deletions
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23
nix/host-modules/swarm-ui.nix
View file

@ -9,6 +9,7 @@
{
lib,
config,
pkgs,
...
}:
let
@ -17,6 +18,26 @@ let
autheliaCfg = config.services.hyperhive.swarm.authelia;
controllerCfg = config.services.hyperhive.swarm.controller;
# Same stylix auto-theming `hive-c0re/theme.nix` gives the dashboard —
# this UI was left out of that overlay entirely (an operator with a
# stylix-themed host saw the dashboard in their own colours but this
# UI still on the default Catppuccin palette), because nothing here
# ever wrote a themed `colors.css` over `cfg.package` before serving
# it; the c0re-side overlay only ever touched `dashboard/`/`agent/`.
# Detection + CSS-generation is shared (`./stylix-theme.nix`);
# `servedPackage` is this module's own overlay-onto-`cfg.package`
# consumer, same shape as `theme.nix`'s `themedFrontend`.
stylixTheme = import ./stylix-theme.nix { inherit lib config pkgs; };
inherit (stylixTheme) stylixThemeColors themedColorsCss;
themedPackage =
c:
pkgs.runCommand "hyperhive-swarm-ui-themed" { } ''
cp -r ${cfg.package} $out
chmod -R u+w $out
install -m644 ${themedColorsCss c} $out/static/colors.css
'';
servedPackage = if stylixThemeColors != null then themedPackage stylixThemeColors else cfg.package;
# Repeated verbatim by every location that should be operator-gated
# (`/`, `/api/`, `/api/docs/`) rather than set once on the server:
# nginx's `auth_request` does NOT inherit across sibling locations, so
@ -170,7 +191,7 @@ in
extraConfig = gatewayCfg.lib.securityHeaders;
locations = {
"/" = {
root = "${cfg.package}";
root = "${servedPackage}";
extraConfig = ''
${swarmAuthRequest}
# SPA: any path the bundle routes client-side is served the