ls: format opt

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

builder/node.go

@@ -2,8 +2,11 @@ package builder
 
 import (
 	"context"
+	"encoding/json"
 	"sort"
+	"strings"
 
+	"github.com/containerd/containerd/platforms"
 	"github.com/docker/buildx/driver"
 	ctxkube "github.com/docker/buildx/driver/kubernetes/context"
 	"github.com/docker/buildx/store"
@@ -199,6 +202,51 @@ func (b *Builder) LoadNodes(ctx context.Context, opts ...LoadNodesOption) (_ []N
 	return b.nodes, nil
 }
 
+func (n *Node) MarshalJSON() ([]byte, error) {
+	var status string
+	if n.DriverInfo != nil {
+		status = n.DriverInfo.Status.String()
+	}
+	var nerr string
+	if n.Err != nil {
+		status = "error"
+		nerr = strings.TrimSpace(n.Err.Error())
+	}
+	var pp []string
+	for _, p := range n.Platforms {
+		pp = append(pp, platforms.Format(p))
+	}
+	return json.Marshal(struct {
+		Name        string
+		Endpoint    string
+		Flags       []string           `json:",omitempty"`
+		DriverOpts  map[string]string  `json:",omitempty"`
+		Files       map[string][]byte  `json:",omitempty"`
+		Status      string             `json:",omitempty"`
+		ProxyConfig map[string]string  `json:",omitempty"`
+		Version     string             `json:",omitempty"`
+		Err         string             `json:",omitempty"`
+		IDs         []string           `json:",omitempty"`
+		Platforms   []string           `json:",omitempty"`
+		GCPolicy    []client.PruneInfo `json:",omitempty"`
+		Labels      map[string]string  `json:",omitempty"`
+	}{
+		Name:        n.Name,
+		Endpoint:    n.Endpoint,
+		Flags:       n.Flags,
+		DriverOpts:  n.DriverOpts,
+		Files:       n.Files,
+		Status:      status,
+		ProxyConfig: n.ProxyConfig,
+		Version:     n.Version,
+		Err:         nerr,
+		IDs:         n.IDs,
+		Platforms:   pp,
+		GCPolicy:    n.GCPolicy,
+		Labels:      n.Labels,
+	})
+}
+
 func (n *Node) loadData(ctx context.Context) error {
 	if n.Driver == nil {
 		return nil