Handle the case when index-state is null

Author: pranaysashank

modules/hackage-project.nix

@@ -21,7 +21,7 @@ in {
       type = lib.types.str;
       default = "default";
       description = ''Hackage revision to use ("default", "r1", "r2", etc.)'';
-      apply = r: if r == "default"
+      apply = r: if r == "default" && !(builtins.isNull index-state)
                  then (lib.attrsets.foldlAttrs
                    (acc: name: value:
                      if value.revTimestamp > acc.rTimestamp

modules/hackage.nix

@@ -88,7 +88,10 @@ let
             lib.mapAttrs
               (_: rev2Config { inherit pname vnum; inherit (version) sha256; })
               (makeContentAddressed
-                (
+                (if builtins.isNull index-state
+                then version.revisions
+                else
+                  (
                   let maxAllowedRev = (lib.attrsets.foldlAttrs
                    (acc: name: value:
                      if value.revTimestamp > acc.rTimestamp
@@ -97,10 +100,10 @@ let
                    )
                    ({ rName = "default"; rTimestamp = "0"; })
                    (
-                   lib.attrsets.filterAttrs (_: a: builtins.isAttrs a && a.revTimestamp <= index-state)
-                     version.revisions
+                     lib.attrsets.filterAttrs (_: a: builtins.isAttrs a && a.revTimestamp <= index-state)
+                       (version.revisions)
                    )).rName;
-                  in (version.revisions // {"default" = version.revisions."${maxAllowedRev}";}))
+                  in (version.revisions // {"default" = version.revisions."${maxAllowedRev}";})))
               );
         }));