V2 podman diff(changes) support

* Ported CLI command
* Added API endpoint
* Added bindings
* Updated swagger (TODO: n endpoints, one handler)

Signed-off-by: Jhon Honce <jhonce@redhat.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/cmd/podmanV2/images/diff.go b/cmd/podmanV2/images/diff.go
new file mode 100644
index 000000000..e913a603a
--- /dev/null
+++ b/cmd/podmanV2/images/diff.go
@@ -0,0 +1,63 @@
+package images
+
+import (
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/cmd/podmanV2/report"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+var (
+	// podman container _inspect_
+	diffCmd = &cobra.Command{
+		Use:     "diff [flags] CONTAINER",
+		Args:    registry.IdOrLatestArgs,
+		Short:   "Inspect changes on image's file systems",
+		Long:    `Displays changes on a image's filesystem.  The image will be compared to its parent layer.`,
+		PreRunE: preRunE,
+		RunE:    diff,
+		Example: `podman image diff myImage
+  podman image diff --format json redis:alpine`,
+	}
+	diffOpts *entities.DiffOptions
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: diffCmd,
+		Parent:  imageCmd,
+	})
+
+	diffOpts = &entities.DiffOptions{}
+	flags := diffCmd.Flags()
+	flags.BoolVar(&diffOpts.Archive, "archive", true, "Save the diff as a tar archive")
+	_ = flags.MarkHidden("archive")
+	flags.StringVar(&diffOpts.Format, "format", "", "Change the output format")
+}
+
+func diff(cmd *cobra.Command, args []string) error {
+	if len(args) == 0 && !diffOpts.Latest {
+		return errors.New("image must be specified: podman image diff [options [...]] ID-NAME")
+	}
+
+	results, err := registry.ImageEngine().Diff(registry.GetContext(), args[0], entities.DiffOptions{})
+	if err != nil {
+		return err
+	}
+
+	switch diffOpts.Format {
+	case "":
+		return report.ChangesToTable(results)
+	case "json":
+		return report.ChangesToJSON(results)
+	default:
+		return errors.New("only supported value for '--format' is 'json'")
+	}
+}
+
+func Diff(cmd *cobra.Command, args []string, options entities.DiffOptions) error {
+	diffOpts = &options
+	return diff(cmd, args)
+}