V2 Fix --latest for podman diff commands

* --latest now forces container diff
* diff options now passed into domain layer
* updated help/usage messages

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

3 files changed, 21 insertions, 11 deletions

diff --git a/cmd/podman/containers/diff.go b/cmd/podman/containers/diff.go
index ebc0d8ea1..046dac53e 100644
--- a/cmd/podman/containers/diff.go
+++ b/cmd/podman/containers/diff.go
@@ -45,7 +45,11 @@ func diff(cmd *cobra.Command, args []string) error {
 		return errors.New("container must be specified: podman container diff [options [...]] ID-NAME")
 	}
 
-	results, err := registry.ContainerEngine().ContainerDiff(registry.GetContext(), args[0], entities.DiffOptions{})
+	var id string
+	if len(args) > 0 {
+		id = args[0]
+	}
+	results, err := registry.ContainerEngine().ContainerDiff(registry.GetContext(), id, *diffOpts)
 	if err != nil {
 		return err
 	}
diff --git a/cmd/podman/diff.go b/cmd/podman/diff.go
index 8db76e8af..ec94c0918 100644
--- a/cmd/podman/diff.go
+++ b/cmd/podman/diff.go
@@ -46,10 +46,9 @@ func init() {
 }
 
 func diff(cmd *cobra.Command, args []string) error {
-	if found, err := registry.ImageEngine().Exists(registry.GetContext(), args[0]); err != nil {
-		return err
-	} else if found.Value {
-		return images.Diff(cmd, args, diffOpts)
+	// Latest implies looking for a container
+	if diffOpts.Latest {
+		return containers.Diff(cmd, args, diffOpts)
 	}
 
 	if found, err := registry.ContainerEngine().ContainerExists(registry.GetContext(), args[0]); err != nil {
@@ -57,5 +56,12 @@ func diff(cmd *cobra.Command, args []string) error {
 	} else if found.Value {
 		return containers.Diff(cmd, args, diffOpts)
 	}
+
+	if found, err := registry.ImageEngine().Exists(registry.GetContext(), args[0]); err != nil {
+		return err
+	} else if found.Value {
+		return images.Diff(cmd, args, diffOpts)
+	}
+
 	return fmt.Errorf("%s not found on system", args[0])
 }
diff --git a/cmd/podman/images/diff.go b/cmd/podman/images/diff.go
index dd98dc4d6..7cfacfc6c 100644
--- a/cmd/podman/images/diff.go
+++ b/cmd/podman/images/diff.go
@@ -11,8 +11,8 @@ import (
 var (
 	// podman container _inspect_
 	diffCmd = &cobra.Command{
-		Use:   "diff [flags] CONTAINER",
-		Args:  registry.IdOrLatestArgs,
+		Use:   "diff [flags] IMAGE",
+		Args:  cobra.ExactArgs(1),
 		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.`,
 		RunE:  diff,
@@ -32,16 +32,16 @@ func init() {
 	diffOpts = &entities.DiffOptions{}
 	flags := diffCmd.Flags()
 	flags.BoolVar(&diffOpts.Archive, "archive", true, "Save the diff as a tar archive")
-	_ = flags.MarkHidden("archive")
+	_ = flags.MarkDeprecated("archive", "Provided for backwards compatibility, has no impact on output.")
 	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")
+	if diffOpts.Latest {
+		return errors.New("image diff does not support --latest")
 	}
 
-	results, err := registry.ImageEngine().Diff(registry.GetContext(), args[0], entities.DiffOptions{})
+	results, err := registry.ImageEngine().Diff(registry.GetContext(), args[0], *diffOpts)
 	if err != nil {
 		return err
 	}