Merge pull request #23283 from yongtang/23211-spf13-cobra-diff

Use spf13/cobra for docker diff
Upstream-commit: 2becfab55fd8ad6ec1d02aea3cd6498a2f91ef68
Component: engine

components/engine/api/client/container/diff.go

@@ -0,0 +1,58 @@
+package container
+
+import (
+	"fmt"
+
+	"golang.org/x/net/context"
+
+	"github.com/docker/docker/api/client"
+	"github.com/docker/docker/cli"
+	"github.com/docker/docker/pkg/archive"
+	"github.com/spf13/cobra"
+)
+
+type diffOptions struct {
+	container string
+}
+
+// NewDiffCommand creats a new cobra.Command for `docker diff`
+func NewDiffCommand(dockerCli *client.DockerCli) *cobra.Command {
+	var opts diffOptions
+
+	cmd := &cobra.Command{
+		Use:   "diff CONTAINER",
+		Short: "Inspect changes on a container's filesystem",
+		Args:  cli.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			opts.container = args[0]
+			return runDiff(dockerCli, &opts)
+		},
+	}
+	cmd.SetFlagErrorFunc(flagErrorFunc)
+
+	return cmd
+}
+
+func runDiff(dockerCli *client.DockerCli, opts *diffOptions) error {
+	ctx := context.Background()
+
+	changes, err := dockerCli.Client().ContainerDiff(ctx, opts.container)
+	if err != nil {
+		return err
+	}
+
+	for _, change := range changes {
+		var kind string
+		switch change.Kind {
+		case archive.ChangeModify:
+			kind = "C"
+		case archive.ChangeAdd:
+			kind = "A"
+		case archive.ChangeDelete:
+			kind = "D"
+		}
+		fmt.Fprintf(dockerCli.Out(), "%s %s\n", kind, change.Path)
+	}
+
+	return nil
+}