Merge pull request #83201 from michaelpj/imp/sources-unnamed

cleanSourceWith: don't use baseNameOf

lib/sources.nix

@@ -63,17 +63,14 @@ rec {
   #             https://nixos.org/nix/manual/#builtin-filterSource
   #
   #   name:     Optional name to use as part of the store path.
-  #             This defaults `src.name` or otherwise `baseNameOf src`.
-  #             We recommend setting `name` whenever `src` is syntactically `./.`.
-  #             Otherwise, you depend on `./.`'s name in the parent directory,
-  #             which can cause inconsistent names, defeating caching.
+  #             This defaults to `src.name` or otherwise `"source"`.
   #
   cleanSourceWith = { filter ? _path: _type: true, src, name ? null }:
     let
       isFiltered = src ? _isLibCleanSourceWith;
       origSrc = if isFiltered then src.origSrc else src;
       filter' = if isFiltered then name: type: filter name type && src.filter name type else filter;
-      name' = if name != null then name else if isFiltered then src.name else baseNameOf src;
+      name' = if name != null then name else if isFiltered then src.name else "source";
     in {
       inherit origSrc;
       filter = filter';