check-nur: extract from the flake

flake.nix

@@ -456,16 +456,10 @@
             # validates that my repo can be included in the Nix User Repository
             type = "app";
             program = builtins.toString (pkgs.writeShellScript "check-nur" ''
-              cd ${./.}/integrations/nur
-              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 \
+              # pass through these attrs 
+              ${./.}/scripts/check-nur \
                 -I nixpkgs=${nixpkgsUnpatched} \
-                -I nixpkgs-overlays=${./.}/hosts/common/nix/overlay \
-                -I ../../ \
-                | tee  # tee to prevent interactive mode
+                -I nixpkgs-overlays=${./.}/hosts/common/nix/overlay
             '');
           };
 

scripts/check-nur

@@ -0,0 +1,12 @@
+#!/bin/sh
+cd ../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 ../../ \
+  "$@" \
+  | tee  # tee to prevent interactive mode
+