vendor: update buildkit to v0.8

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

vendor/github.com/moby/buildkit/util/grpcerrors/grpcerrors.go

@@ -33,8 +33,12 @@ func ToGRPC(err error) error {
 		st = status.New(Code(err), err.Error())
 	}
 	if st.Code() != Code(err) {
+		code := Code(err)
+		if code == codes.OK {
+			code = codes.Unknown
+		}
 		pb := st.Proto()
-		pb.Code = int32(Code(err))
+		pb.Code = int32(code)
 		st = status.FromProto(pb)
 	}
 
@@ -96,9 +100,10 @@ func Code(err error) codes.Code {
 		Unwrap() error
 	})
 	if ok {
-		return Code(wrapped.Unwrap())
+		if err := wrapped.Unwrap(); err != nil {
+			return Code(err)
+		}
 	}
-
 	return status.FromContextError(err).Code()
 }
 
@@ -120,7 +125,9 @@ func AsGRPCStatus(err error) (*status.Status, bool) {
 		Unwrap() error
 	})
 	if ok {
-		return AsGRPCStatus(wrapped.Unwrap())
+		if err := wrapped.Unwrap(); err != nil {
+			return AsGRPCStatus(err)
+		}
 	}
 
 	return nil, false
@@ -174,6 +181,10 @@ func FromGRPC(err error) error {
 		err = d.WrapError(err)
 	}
 
+	if err != nil {
+		stack.Helper()
+	}
+
 	return stack.Enable(err)
 }
 
@@ -182,6 +193,10 @@ type withCode struct {
 	error
 }
 
+func (e *withCode) Code() codes.Code {
+	return e.code
+}
+
 func (e *withCode) Unwrap() error {
 	return e.error
 }

vendor/github.com/moby/buildkit/util/grpcerrors/intercept.go

@@ -2,27 +2,53 @@ package grpcerrors
 
 import (
 	"context"
+	"log"
+	"os"
 
+	"github.com/moby/buildkit/util/stack"
+	"github.com/pkg/errors"
 	"google.golang.org/grpc"
 )
 
 func UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
 	resp, err = handler(ctx, req)
+	oldErr := err
 	if err != nil {
+		stack.Helper()
 		err = ToGRPC(err)
 	}
+	if oldErr != nil && err == nil {
+		logErr := errors.Wrap(err, "invalid grpc error conversion")
+		if os.Getenv("BUILDKIT_DEBUG_PANIC_ON_ERROR") == "1" {
+			panic(logErr)
+		}
+		log.Printf("%v", logErr)
+		err = oldErr
+	}
+
 	return resp, err
 }
 
 func StreamServerInterceptor(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
-	return ToGRPC(handler(srv, ss))
+	err := ToGRPC(handler(srv, ss))
+	if err != nil {
+		stack.Helper()
+	}
+	return err
 }
 
 func UnaryClientInterceptor(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
-	return FromGRPC(invoker(ctx, method, req, reply, cc, opts...))
+	err := FromGRPC(invoker(ctx, method, req, reply, cc, opts...))
+	if err != nil {
+		stack.Helper()
+	}
+	return err
 }
 
 func StreamClientInterceptor(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
 	s, err := streamer(ctx, desc, cc, method, opts...)
+	if err != nil {
+		stack.Helper()
+	}
 	return s, ToGRPC(err)
 }