Add a test for ‘nix-env --set-flag active ...’

corepkgs/buildenv.nix

@@ -13,7 +13,7 @@ derivation {
   # !!! grmbl, need structured data for passing this in a clean way.
   derivations =
     map (d:
-      [ (if d.meta.active or true then "1" else "0")
+      [ (d.meta.active or "true")
         (d.meta.priority or 5)
         (builtins.length d.outputs)
       ] ++ map (output: builtins.getAttr output d) d.outputs)

corepkgs/buildenv.pl

@@ -134,7 +134,7 @@ while (scalar @derivations) {
     for (my $n = 0; $n < $outputs; $n++) {
         my $path = shift @derivations;
         $pkgs{$path} =
-            { active => int($active)
+            { active => $active ne "false"
             , priority => int($priority) };
     }
 }