From 9afc73703f1bc502846f0a440a90867a3122cdcc Mon Sep 17 00:00:00 2001
From: Guillaume Girol <symphorien+git@xlumurb.eu>
Date: Sat, 1 Nov 2025 12:00:00 +0000
Subject: [PATCH] nixos/printing: fix printing from cups-browsed (eg, from
 ipp-usb)

When cups-browsed was separated from cups in f1f9a54031dbc95b6e924772fddd125debb697bb
the implicitclass backend ($out/lib/cups/backend/implicitclass) was
moved from cups-filters to cups-browsed. When ipp-usb advertises a
printer, cups-browsed configures cups to add an implicitclass://...
printer and cups fails to find the corresponding backend:

cups.service cupsd[788465] DEBUG Canon_TR4500_series_USB device-uri: Unknown scheme in URI
cups.service cupsd[788465] DEBUG CUPS-Add-Modify-Printer client-error-not-possible: Bad device-uri scheme "implicitclass".
cups.service cupsd[788465] ERROR [Client 6] Returning IPP client-error-not-possible for CUPS-Add-Modify-Printer (ipp://localhost/printers/Canon_TR4500_series_USB) from localhost

This commit adds cups-browsed to the packages that compose the ServerBin
option of cups-files.conf so that cups can find the implicitclass
backend.
---
 nixos/modules/services/printing/cupsd.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nixos/modules/services/printing/cupsd.nix b/nixos/modules/services/printing/cupsd.nix
index ce0b1159470a..37e15130b8cd 100644
--- a/nixos/modules/services/printing/cupsd.nix
+++ b/nixos/modules/services/printing/cupsd.nix
@@ -54,6 +54,7 @@ let
       cups-filters
       pkgs.ghostscript
     ]
+    ++ lib.optional cfg.browsed.enable cfg.browsed.package
     ++ cfg.drivers;
     pathsToLink = [
       "/lib"