commands: build summary of warnings on build

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

commands/build.go

@@ -1,9 +1,11 @@
 package commands
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"strings"
@@ -22,7 +24,9 @@ import (
 	"github.com/docker/go-units"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/session/auth/authprovider"
+	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/util/appcontext"
+	"github.com/morikuni/aec"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -245,9 +249,51 @@ func buildTargets(ctx context.Context, dockerCli command.Cli, opts map[string]bu
 		}
 	}
 
+	printWarnings(os.Stderr, printer.Warnings(), progressMode)
+
 	return resp[defaultTargetName].ExporterResponse["containerimage.digest"], err
 }
 
+func printWarnings(w io.Writer, warnings []client.VertexWarning, mode string) {
+	if len(warnings) == 0 || mode == progress.PrinterModeQuiet {
+		return
+	}
+	fmt.Fprintf(w, "\n ")
+	sb := &bytes.Buffer{}
+	if len(warnings) == 1 {
+		fmt.Fprintf(sb, "1 warning found")
+	} else {
+		fmt.Fprintf(sb, "%d warnings found", len(warnings))
+	}
+	if logrus.GetLevel() < logrus.DebugLevel {
+		fmt.Fprintf(sb, " (use --debug to expand)")
+	}
+	fmt.Fprintf(sb, ":\n")
+	fmt.Fprint(w, aec.Apply(sb.String(), aec.YellowF))
+
+	for _, warn := range warnings {
+		fmt.Fprintf(w, " - %s\n", warn.Short)
+		if logrus.GetLevel() < logrus.DebugLevel {
+			continue
+		}
+		for _, d := range warn.Detail {
+			fmt.Fprintf(w, "%s\n", d)
+		}
+		if warn.URL != "" {
+			fmt.Fprintf(w, "More info: %s\n", warn.URL)
+		}
+		if warn.SourceInfo != nil && warn.Range != nil {
+			src := errdefs.Source{
+				Info:   warn.SourceInfo,
+				Ranges: warn.Range,
+			}
+			src.Print(w)
+		}
+		fmt.Fprintf(w, "\n")
+
+	}
+}
+
 func newBuildOptions() buildOptions {
 	ulimits := make(map[string]*units.Ulimit)
 	return buildOptions{

go.mod

@@ -32,6 +32,7 @@ require (
 	github.com/jinzhu/inflection v0.0.0-20180308033659-04140366298a // indirect
 	github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 // indirect
 	github.com/moby/buildkit v0.9.1-0.20211215010209-539be1708964
+	github.com/morikuni/aec v1.0.0
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opencontainers/image-spec v1.0.2-0.20210819154149-5ad6f50d6283
 	github.com/pelletier/go-toml v1.9.4

util/logutil/pause.go

@@ -0,0 +1,52 @@
+package logutil
+
+import (
+	"bytes"
+	"io"
+	"sync"
+
+	"github.com/sirupsen/logrus"
+)
+
+func Pause(l *logrus.Logger) func() {
+	// initialize formatter with original terminal settings
+	l.Formatter.Format(logrus.NewEntry(l))
+
+	bw := newBufferedWriter(l.Out)
+	l.SetOutput(bw)
+	return func() {
+		bw.resume()
+	}
+}
+
+type bufferedWriter struct {
+	mu  sync.Mutex
+	buf *bytes.Buffer
+	w   io.Writer
+}
+
+func newBufferedWriter(w io.Writer) *bufferedWriter {
+	return &bufferedWriter{
+		buf: bytes.NewBuffer(nil),
+		w:   w,
+	}
+}
+
+func (bw *bufferedWriter) Write(p []byte) (int, error) {
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	if bw.buf == nil {
+		return bw.w.Write(p)
+	}
+	return bw.buf.Write(p)
+}
+
+func (bw *bufferedWriter) resume() {
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	if bw.buf == nil {
+		return
+	}
+	io.Copy(bw.w, bw.buf)
+	bw.buf = nil
+}

util/progress/printer.go

@@ -7,8 +7,10 @@ import (
 	"os"
 
 	"github.com/containerd/console"
+	"github.com/docker/buildx/util/logutil"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/util/progress/progressui"
+	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -22,6 +24,7 @@ type Printer struct {
 	status   chan *client.SolveStatus
 	done     <-chan struct{}
 	err      error
+	warnings []client.VertexWarning
 }
 
 func (p *Printer) Wait() error {
@@ -34,6 +37,10 @@ func (p *Printer) Write(s *client.SolveStatus) {
 	p.status <- s
 }
 
+func (p *Printer) Warnings() []client.VertexWarning {
+	return p.warnings
+}
+
 func NewPrinter(ctx context.Context, out console.File, mode string) *Printer {
 	statusCh := make(chan *client.SolveStatus)
 	doneCh := make(chan struct{})
@@ -58,8 +65,10 @@ func NewPrinter(ctx context.Context, out console.File, mode string) *Printer {
 				c = cons
 			}
 		}
+		resumeLogs := logutil.Pause(logrus.StandardLogger())
 		// not using shared context to not disrupt display but let is finish reporting errors
-		_, pw.err = progressui.DisplaySolveStatus(ctx, "", c, w, statusCh)
+		pw.warnings, pw.err = progressui.DisplaySolveStatus(ctx, "", c, w, statusCh)
+		resumeLogs()
 		close(doneCh)
 	}()
 	return pw

vendor/modules.txt

@@ -354,6 +354,7 @@ github.com/modern-go/concurrent
 # github.com/modern-go/reflect2 v1.0.1
 github.com/modern-go/reflect2
 # github.com/morikuni/aec v1.0.0
+## explicit
 github.com/morikuni/aec
 # github.com/opencontainers/go-digest v1.0.0
 ## explicit