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, 5 insertions, 3 deletions

diff --git a/third_party/nix/src/libstore/store-api.hh b/third_party/nix/src/libstore/store-api.hh
index 76c757bd6939..eb18511e60df 100644
--- a/third_party/nix/src/libstore/store-api.hh
+++ b/third_party/nix/src/libstore/store-api.hh
@@ -468,12 +468,14 @@ class Store : public std::enable_shared_from_this<Store>, public Config {
      on-disk .drv file). Note that ‘drvPath’ is only used for
      informational purposes. */
   // TODO(tazjin): Thread std::ostream through here, too.
-  virtual BuildResult buildDerivation(const Path& drvPath,
+  virtual BuildResult buildDerivation(std::ostream& log_sink,
+                                      const Path& drvPath,
                                       const BasicDerivation& drv,
                                       BuildMode buildMode) = 0;
 
-  BuildResult buildDerivation(const Path& drvPath, const BasicDerivation& drv) {
-    return buildDerivation(drvPath, drv, bmNormal);
+  BuildResult buildDerivation(std::ostream& log_sink, const Path& drvPath,
+                              const BasicDerivation& drv) {
+    return buildDerivation(log_sink, drvPath, drv, bmNormal);
   }
 
   /* Ensure that a path is valid.  If it is not currently valid, it