NUR: fix eval

locally, at least: hopefully this fixes the CI jobs as well

pkgs/by-name/linux-armbian/package.nix

@@ -20,7 +20,10 @@
 let
   linux = linux_latest;
   patches = import ./patches.nix { inherit fetchFromGitHub lib newScope; };
-
+  nullPatch = {
+    name = "null-patch";
+    patch = null;
+  };
 in
 linux.override {
   # inherit (linux_latest) src version modDirVersion;
@@ -346,7 +349,7 @@ linux.override {
     # notably, it defines several of the voltage regulators, one of which is required to power the modem.
     byName."arm64-dts-sun50i-a64-pinephone-Add-Type-C-support-for-all-PP-va"
     patches.sane.vbat-bb-always-on  #< slight tweak to `Add-Type-C-support...` to ensure power to the modem
-    (if withModemPower then byName."arm64-dts-sun50i-a64-pinephone-Add-modem-power-manager" else { patch = null; })
+    (if withModemPower then byName."arm64-dts-sun50i-a64-pinephone-Add-modem-power-manager" else nullPatch)
     # byName."arm64-dts-sun50i-a64-pinephone-Fix-BH-modem-manager-behavior"
     # byName."arm64-dts-sun50i-a64-pinephone-Add-detailed-OCV-to-capactiy-con"
     # byName."arm64-dts-sun50i-a64-pinephone-Shorten-post-power-on-delay-on-m"
@@ -422,7 +425,7 @@ linux.override {
     # # byName."arm64-dts-allwinner-h6-Add-SCPI-protocol"
     # # byName."ARM-dts-sun8i-a83t-tbs-a711-Give-Linux-more-privileges-over-SCP"
     # # byName."rtc-sun6i-Allow-RTC-wakeup-after-shutdown"
-    (if withModemPower then byName."misc-modem-power-Power-manager-for-modems" else { patch = null; })
+    (if withModemPower then byName."misc-modem-power-Power-manager-for-modems" else nullPatch)
     # # byName."ARM-dts-sun8i-a83t-Add-missing-GPU-trip-point"
     # # byName."arm64-dts-sun50i-h5-Add-missing-GPU-trip-point"
     # byName."arm64-dts-sun50i-a64-Add-missing-trip-points-for-GPU"

scripts/check-nur

@@ -1,13 +1,15 @@
 #!/bin/sh
 NIX_FILES_TOP=/home/colin/nixos
+nixpkgs=$(nix-store --realize $(nix-instantiate -A nixpkgs-bootstrap.master.src))
+
 cd $NIX_FILES_TOP/integrations/nur
-# TODO: should include `-I nixpkgs=</path/to/an/unpatched/nixpkgs>`
+
 NIX_PATH= NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nix-env -f . -qa \* --meta --xml \
   --allowed-uris https://static.rust-lang.org \
   --option restrict-eval true \
   --option allow-import-from-derivation true \
   --drv-path --show-trace \
+  -I nixpkgs=$nixpkgs \
   -I ../../ \
   "$@" \
   | tee  # tee to prevent interactive mode
-