vendor: update buildkit with typed errors support

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

vendor/github.com/moby/buildkit/util/progress/multiwriter.go

@@ -0,0 +1,104 @@
+package progress
+
+import (
+	"sort"
+	"sync"
+	"time"
+)
+
+type rawProgressWriter interface {
+	WriteRawProgress(*Progress) error
+	Close() error
+}
+
+type MultiWriter struct {
+	mu      sync.Mutex
+	items   []*Progress
+	writers map[rawProgressWriter]struct{}
+	meta    map[string]interface{}
+}
+
+func NewMultiWriter(opts ...WriterOption) *MultiWriter {
+	mw := &MultiWriter{
+		writers: map[rawProgressWriter]struct{}{},
+		meta:    map[string]interface{}{},
+	}
+	for _, o := range opts {
+		o(mw)
+	}
+	return mw
+}
+
+func (ps *MultiWriter) Add(pw Writer) {
+	rw, ok := pw.(rawProgressWriter)
+	if !ok {
+		return
+	}
+	ps.mu.Lock()
+	plist := make([]*Progress, 0, len(ps.items))
+	for _, p := range ps.items {
+		plist = append(plist, p)
+	}
+	sort.Slice(plist, func(i, j int) bool {
+		return plist[i].Timestamp.Before(plist[j].Timestamp)
+	})
+	for _, p := range plist {
+		rw.WriteRawProgress(p)
+	}
+	ps.writers[rw] = struct{}{}
+	ps.mu.Unlock()
+}
+
+func (ps *MultiWriter) Delete(pw Writer) {
+	rw, ok := pw.(rawProgressWriter)
+	if !ok {
+		return
+	}
+
+	ps.mu.Lock()
+	delete(ps.writers, rw)
+	ps.mu.Unlock()
+}
+
+func (ps *MultiWriter) Write(id string, v interface{}) error {
+	p := &Progress{
+		ID:        id,
+		Timestamp: time.Now(),
+		Sys:       v,
+		meta:      ps.meta,
+	}
+	return ps.WriteRawProgress(p)
+}
+
+func (ps *MultiWriter) WriteRawProgress(p *Progress) error {
+	meta := p.meta
+	if len(ps.meta) > 0 {
+		meta = map[string]interface{}{}
+		for k, v := range p.meta {
+			meta[k] = v
+		}
+		for k, v := range ps.meta {
+			if _, ok := meta[k]; !ok {
+				meta[k] = v
+			}
+		}
+	}
+	p.meta = meta
+	return ps.writeRawProgress(p)
+}
+
+func (ps *MultiWriter) writeRawProgress(p *Progress) error {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	ps.items = append(ps.items, p)
+	for w := range ps.writers {
+		if err := w.WriteRawProgress(p); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (ps *MultiWriter) Close() error {
+	return nil
+}