add an option to use a custom progress printer for the build progress output

pkg/api/api.go

@@ -19,6 +19,7 @@ package api
 import (
 	"context"
 	"fmt"
+	"io"
 	"strings"
 	"time"
 
@@ -147,6 +148,8 @@ type BuildOptions struct {
 	Memory int64
 	// Builder name passed in the command line
 	Builder string
+	// OutPrinter used for printing the progress output
+	OutPrinter io.Writer
 }
 
 // Apply mutates project according to build options

pkg/compose/build.go

@@ -20,12 +20,14 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 
 	"github.com/moby/buildkit/util/progress/progressui"
 
 	"github.com/compose-spec/compose-go/v2/types"
+	"github.com/containerd/console"
 	"github.com/containerd/containerd/platforms"
 	"github.com/docker/buildx/build"
 	"github.com/docker/buildx/builder"
@@ -127,10 +129,15 @@ func (s *composeService) build(ctx context.Context, project *types.Project, opti
 		progressCtx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 
+		var outPrinter io.Writer = os.Stdout
+		if options.OutPrinter != nil {
+			outPrinter = options.OutPrinter
+		}
+
 		if options.Quiet {
 			options.Progress = progress.ModeQuiet
 		}
-		w, err = xprogress.NewPrinter(progressCtx, os.Stdout, progressui.DisplayMode(options.Progress),
+		w, err = xprogress.NewPrinter(progressCtx, progressPrinter(outPrinter), progressui.DisplayMode(options.Progress),
 			xprogress.WithDesc(
 				fmt.Sprintf("building with %q instance using %s driver", b.Name, b.Driver),
 				fmt.Sprintf("%s:%s", b.Driver, b.Name),
@@ -567,3 +574,29 @@ func parsePlatforms(service types.ServiceConfig) ([]specs.Platform, error) {
 
 	return ret, nil
 }
+
+type pPrinter struct {
+	io.Writer
+}
+
+func (p *pPrinter) Read(_ []byte) (n int, err error) {
+	return 0, errors.New("not implemented")
+}
+
+func (p *pPrinter) Close() error {
+	return nil
+}
+
+func (p *pPrinter) Fd() uintptr {
+	return 0
+}
+
+func (p *pPrinter) Name() string {
+	return "pPrinter"
+}
+
+func progressPrinter(w io.Writer) console.File {
+	return &pPrinter{
+		Writer: w,
+	}
+}