refactor(tvix): Use absl::btree_map for BasicDerivation's env r/1612

Change-Id: I111a9a268debea322f23fdced3bed9ff3e8ed3b3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1685
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI

1 files changed, 3 insertions, 2 deletions

diff --git a/third_party/nix/src/libstore/derivations.cc b/third_party/nix/src/libstore/derivations.cc
index adfc6fc05f..0e8b637fa7 100644
--- a/third_party/nix/src/libstore/derivations.cc
+++ b/third_party/nix/src/libstore/derivations.cc
@@ -50,8 +50,9 @@ BasicDerivation BasicDerivation::from_proto(
   result.args.insert(result.args.end(), proto_derivation->args().begin(),
                      proto_derivation->args().end());
 
-  result.env.insert(proto_derivation->env().begin(),
-                    proto_derivation->env().end());
+  for (auto [k, v] : proto_derivation->env()) {
+    result.env.emplace(k, v);
+  }
 
   return result;
 }