vendor: update buildkit with typed errors support

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

vendor/github.com/moby/buildkit/session/group.go

@@ -0,0 +1,88 @@
+package session
+
+import (
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+type Group interface {
+	SessionIterator() Iterator
+}
+type Iterator interface {
+	NextSession() string
+}
+
+func NewGroup(ids ...string) Group {
+	return &group{ids: ids}
+}
+
+type group struct {
+	ids []string
+}
+
+func (g *group) SessionIterator() Iterator {
+	return &group{ids: g.ids}
+}
+
+func (g *group) NextSession() string {
+	if len(g.ids) == 0 {
+		return ""
+	}
+	v := g.ids[0]
+	g.ids = g.ids[1:]
+	return v
+}
+
+func AllSessionIDs(g Group) (out []string) {
+	if g == nil {
+		return nil
+	}
+	it := g.SessionIterator()
+	if it == nil {
+		return nil
+	}
+	for {
+		v := it.NextSession()
+		if v == "" {
+			return
+		}
+		out = append(out, v)
+	}
+}
+
+func (sm *Manager) Any(ctx context.Context, g Group, f func(context.Context, string, Caller) error) error {
+	if g == nil {
+		return nil
+	}
+
+	iter := g.SessionIterator()
+	if iter == nil {
+		return nil
+	}
+
+	var lastErr error
+	for {
+		id := iter.NextSession()
+		if id == "" {
+			if lastErr != nil {
+				return lastErr
+			}
+			return errors.Errorf("no active sessions")
+		}
+
+		timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+		defer cancel()
+		c, err := sm.Get(timeoutCtx, id, false)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+		if err := f(ctx, id, c); err != nil {
+			lastErr = err
+			continue
+		}
+		return nil
+	}
+}