fix build on go > 1.8.x

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

api/server/middleware/audit_linux.go

@@ -82,8 +82,17 @@ func getFdFromWriter(w http.ResponseWriter) int {
 		return -1
 	}
 	sysfd := netfd.FieldByName("sysfd")
-	//Finally, we have the fd
-	return int(sysfd.Int())
+	if sysfd.IsValid() {
+		// go < 1.9
+		return int(sysfd.Int())
+	}
+	pfd := netfd.FieldByName("pfd")
+	if pfd.Kind() != reflect.Struct {
+		logrus.Warnf("could not get underlying pfd struct")
+		return -1
+	}
+	newSysfd := pfd.FieldByName("Sysfd")
+	return int(newSysfd.Int())
 }
 
 //Gets the ucred given an http response writer

daemon/graphdriver/devmapper/deviceset.go

@@ -29,6 +29,7 @@ import (
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/parsers"
 	"github.com/docker/go-units"
+	pkgerr "github.com/pkg/errors"
 
 	"github.com/opencontainers/runc/libcontainer/label"
 )
@@ -2717,10 +2718,10 @@ func NewDeviceSet(root string, doInit bool, options []string, uidMaps, gidMaps [
 		case "dm.libdm_log_level":
 			level, err := strconv.ParseInt(val, 10, 32)
 			if err != nil {
-				return nil, errors.Wrapf(err, "could not parse `dm.libdm_log_level=%s`", val)
+				return nil, pkgerr.Wrapf(err, "could not parse `dm.libdm_log_level=%s`", val)
 			}
 			if level < devicemapper.LogLevelFatal || level > devicemapper.LogLevelDebug {
-				return nil, errors.Errorf("dm.libdm_log_level must be in range [%d,%d]", devicemapper.LogLevelFatal, devicemapper.LogLevelDebug)
+				return nil, pkgerr.Errorf("dm.libdm_log_level must be in range [%d,%d]", devicemapper.LogLevelFatal, devicemapper.LogLevelDebug)
 			}
 			// Register a new logging callback with the specified level.
 			devicemapper.LogInit(devicemapper.DefaultLogger{