feat(tvix): Thread a log sink through calls to buildDerivation r/1946

Similarly to how we did for buildPaths, add a std::ostream& log_sink
parameter to the build_derivation method on Store, and pass it std::cerr
when called at the top level by nix commands - most notably, the
build-remote hook binary, so that we get build logs when using tvix as a
remote builder.

Change-Id: I0f8f729ba8429d4838a0a135a5c2ac1e1a95d575
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2176
Tested-by: BuildkiteCI
Reviewed-by: andi <andi@notmuch.email>
Reviewed-by: kanepyork <rikingcoding@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/third_party/nix/src/nix-store/nix-store.cc b/third_party/nix/src/nix-store/nix-store.cc
index 535903d823ed..532f60b7b7e3 100644
--- a/third_party/nix/src/nix-store/nix-store.cc
+++ b/third_party/nix/src/nix-store/nix-store.cc
@@ -1088,7 +1088,7 @@ static void opServe(Strings opFlags, Strings opArgs) {
         getBuildSettings();
 
         MonitorFdHup monitor(in.fd);
-        auto status = store->buildDerivation(drvPath, drv);
+        auto status = store->buildDerivation(std::cerr, drvPath, drv);
 
         out << status.status << status.errorMsg;