stdenv: pURL speed optimization

pkgs/build-support/go/module.nix

@@ -424,7 +424,12 @@ lib.extendMkDerivation {
       meta = {
         # Add default meta information.
         platforms = go.meta.platforms or lib.platforms.all;
-        identifiers.purlParts = finalAttrs.src.meta.identifiers.purlParts or { };
+        identifiers = {
+          ${if (finalAttrs.src.meta.identifiers.purl or null) != null then "purl" else null} =
+            finalAttrs.src.meta.identifiers.purl;
+          ${if (finalAttrs.src.meta.identifiers.purls or null) != null then "purls" else null} =
+            finalAttrs.src.meta.identifiers.purls;
+        };
       }
       // meta;
     };

pkgs/development/interpreters/python/mk-python-derivation.nix

@@ -416,7 +416,12 @@ let
         # default to python's platforms
         platforms = python.meta.platforms;
         isBuildPythonPackage = python.meta.platforms;
-        identifiers.purlParts = attrs.src.meta.identifiers.purlParts or { };
+        identifiers = {
+          ${if (attrs.src.meta.identifiers.purl or null) != null then "purl" else null} =
+            attrs.src.meta.identifiers.purl;
+          ${if (attrs.src.meta.identifiers.purls or null) != null then "purls" else null} =
+            attrs.src.meta.identifiers.purls;
+        };
       }
       // meta;
     }

pkgs/development/ruby-modules/gem/default.nix

@@ -308,7 +308,11 @@ lib.makeOverridable (
         };
       })
       // (lib.optionalAttrs (type == "git") {
-        identifiers.purlParts = src.meta.identifiers.purlParts or { };
+        identifiers = {
+          ${if (src.meta.identifiers.purl or null) != null then "purl" else null} = src.meta.identifiers.purl;
+          ${if (src.meta.identifiers.purls or null) != null then "purls" else null} =
+            src.meta.identifiers.purls;
+        };
       })
       // meta;
     }

pkgs/stdenv/generic/check-meta.nix

@@ -605,12 +605,6 @@ let
     })
     tryCPEPatchVersionInUpdateWithVendor
   ];
-  hasAllPURLParts =
-    purlParts:
-    let
-      values = attrValues purlParts;
-    in
-    (length values == 2) && !any isNull values;
 
   # The meta attribute is passed in the resulting attribute set,
   # but it's not part of the actual derivation, i.e., it's not
@@ -718,14 +712,16 @@ let
               ) possibleCPEPartsFuns;
 
           purlParts = attrs.meta.identifiers.purlParts or { };
-          purl = if hasAllPURLParts purlParts then "pkg:${purlParts.type}/${purlParts.spec}" else null;
-          purls = optional (purl != null) purl;
+          purl =
+            attrs.meta.identifiers.purl or (
+              if purlParts ? type && purlParts ? spec then "pkg:${purlParts.type}/${purlParts.spec}" else null
+            );
+          purls = attrs.meta.identifiers.purls or (optional (purl != null) purl);
 
           v1 = {
             inherit
               cpeParts
               possibleCPEs
-              purlParts
               purls
               ;
             ${if cpe != null then "cpe" else null} = cpe;
@@ -734,7 +730,7 @@ let
         in
         v1
         // {
-          inherit v1;
+          inherit v1 purlParts;
         };
 
       # Expose the result of the checks for everyone to see.