Merge pull request #2650 from crazy-max/fix-subrequest-metadatafile

build: skip build ref and provenance metadata for subrequests

build/build.go

@@ -510,12 +510,14 @@ func BuildWithResultHandler(ctx context.Context, nodes []builder.Node, opt map[s
 					for k, v := range printRes {
 						rr.ExporterResponse[k] = string(v)
 					}
+					if opt.PrintFunc == nil {
 						rr.ExporterResponse["buildx.build.ref"] = buildRef
 						if node.Driver.HistoryAPISupported(ctx) {
 							if err := setRecordProvenance(ctx, c, rr, so.Ref, opt.ProvenanceResponseMode, pw); err != nil {
 								return err
 							}
 						}
+					}
 
 					node := dp.Node().Driver
 					if node.IsMobyDriver() {

tests/bake.go

@@ -1271,6 +1271,6 @@ target "default" {}
 	}
 	var md mdT
 	require.NoError(t, json.Unmarshal(dt, &md), dt)
-	require.NotEmpty(t, md.Default.BuildRef)
+	require.Empty(t, md.Default.BuildRef)
 	require.Len(t, md.Default.ResultJSON.Warnings, 3)
 }

tests/build.go

@@ -1228,7 +1228,7 @@ COPy --from=base \
 		}
 		var md mdT
 		require.NoError(t, json.Unmarshal(dt, &md), dt)
-		require.NotEmpty(t, md.BuildRef)
+		require.Empty(t, md.BuildRef)
 		require.Len(t, md.ResultJSON.Warnings, 3)
 	})
 }