Remove unnecessary "system" argument

corepkgs/buildenv.nix

@@ -1,10 +1,10 @@
 with import <nix/config.nix>;
 
-{ system, derivations, manifest }:
+{ derivations, manifest }:
 
 derivation { 
   name = "user-environment";
-  system = system;
+  system = builtins.currentSystem;
   builder = perl;
   args = [ "-w" ./buildenv.pl ];
   

corepkgs/nar.nix

@@ -20,11 +20,12 @@ let
 
 in
 
-{ system, storePath, hashAlgo }:
+{ storePath, hashAlgo }:
 
 derivation {
   name = "nar";
+  system = builtins.currentSystem;
   builder = shell;
   args = [ "-e" builder ];
-  inherit system storePath hashAlgo;
+  inherit storePath hashAlgo;
 }

scripts/nix-push.in

@@ -103,7 +103,7 @@ foreach my $storePath (@storePaths) {
     # Construct a Nix expression that creates a Nix archive.
     my $nixexpr = 
         "(import <nix/nar.nix> " .
-        "{ storePath = builtins.storePath \"$storePath\"; system = \"@system@\"; hashAlgo = \"$hashAlgo\"; }) ";
+        "{ storePath = builtins.storePath \"$storePath\"; hashAlgo = \"$hashAlgo\"; }) ";
     
     print NIX $nixexpr;
 }

src/nix-env/user-env.cc

@@ -118,7 +118,6 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
        builder with the manifest as argument. */
     Value args, topLevel;
     state.mkAttrs(args, 3);
-    mkString(*state.allocAttr(args, state.sSystem), thisSystem);
     mkString(*state.allocAttr(args, state.symbols.create("manifest")),
         manifestFile, singleton<PathSet>(manifestFile));
     args.attrs->push_back(Attr(state.symbols.create("derivations"), &manifest));