populate git: add clean.exclude

README.md

@@ -26,9 +26,9 @@ let
 
   source = lib.evalSource [{
     nixpkgs.git = {
+      clean.exclude = ["/.version-suffix"];
       ref = "4b4bbce199d3b3a8001ee93495604289b01aaad3";
       url = https://github.com/NixOS/nixpkgs;
-
     };
     nixos-config.file = toString (pkgs.writeText "nixos-config" ''
       { pkgs, ... }: {

lib/default.nix

@@ -16,6 +16,7 @@ let {
         };
       };
       sanitize = x: lib.getAttr (lib.typeOf x) {
+        list = map sanitize x;
         set = lib.mapAttrs
                 (lib.const sanitize)
                 (lib.filterAttrs

lib/types/populate.nix

@@ -56,6 +56,12 @@
     };
     git = lib.types.submodule {
       options = {
+        clean = {
+          exclude = lib.mkOption {
+            default = [];
+            type = lib.types.listOf lib.types.str;
+          };
+        };
         ref = lib.mkOption {
           type = lib.types.str; # TODO lib.types.git.ref
         };

pkgs/populate/default.nix

@@ -45,7 +45,10 @@ let
       git submodule update --init --recursive
     fi
 
-    git clean -dfx
+    git clean -dfx \
+        ${concatMapStringsSep " "
+          (pattern: /* sh */ "-e ${quote pattern}")
+          source.clean.exclude }
   '';
 
   pop.pass = target: source: let