disable otel error logging

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

cmd/buildctl/main.go

@@ -17,12 +17,16 @@ import (
 	"github.com/moby/buildkit/version"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
+	"go.opentelemetry.io/otel"
 )
 
 func init() {
 	apicaps.ExportedProduct = "buildkit"
 
 	stack.SetVersionInfo(version.Version, version.Revision)
+
+	// do not log tracing errors to stdio
+	otel.SetErrorHandler(skipErrors{})
 }
 
 func main() {
@@ -122,3 +126,7 @@ func handleErr(debug bool, err error) {
 	}
 	os.Exit(1)
 }
+
+type skipErrors struct{}
+
+func (skipErrors) Handle(err error) {}

cmd/buildkitd/main.go

@@ -56,6 +56,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/sync/errgroup"
@@ -66,6 +67,10 @@ func init() {
 	apicaps.ExportedProduct = "buildkit"
 	stack.SetVersionInfo(version.Version, version.Revision)
 
+	// OTEL error handling is broken https://github.com/open-telemetry/opentelemetry-go/pull/1851
+	// remove this with otel update
+	otel.SetErrorHandler(skipErrors{})
+
 	seed.WithTimeAndRand()
 	reexec.Init()
 }
@@ -749,3 +754,7 @@ type constTracerProvider struct {
 func (tp constTracerProvider) Tracer(instrumentationName string, opts ...trace.TracerOption) trace.Tracer {
 	return tp.tracer
 }
+
+type skipErrors struct{}
+
+func (skipErrors) Handle(err error) {}