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, 74 insertions, 0 deletions

diff --git a/cmd/podmanV2/diff.go b/cmd/podmanV2/diff.go
new file mode 100644
index 000000000..6e4263370
--- /dev/null
+++ b/cmd/podmanV2/diff.go
@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/containers/libpod/cmd/podmanV2/containers"
+	"github.com/containers/libpod/cmd/podmanV2/images"
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/spf13/cobra"
+)
+
+// Inspect is one of the outlier commands in that it operates on images/containers/...
+
+var (
+	// Command: podman _diff_ Object_ID
+	diffDescription = `Displays changes on a container or image's filesystem.  The container or image will be compared to its parent layer.`
+	diffCmd         = &cobra.Command{
+		Use:              "diff [flags] {CONTAINER_ID | IMAGE_ID}",
+		Args:             registry.IdOrLatestArgs,
+		Short:            "Display the changes of object's file system",
+		Long:             diffDescription,
+		TraverseChildren: true,
+		RunE:             diff,
+		Example: `podman diff imageID
+  podman diff ctrID
+  podman 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,
+	})
+	diffCmd.SetHelpTemplate(registry.HelpTemplate())
+	diffCmd.SetUsageTemplate(registry.UsageTemplate())
+
+	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")
+
+	if !registry.IsRemote() {
+		flags.BoolVarP(&diffOpts.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
+	}
+}
+
+func diff(cmd *cobra.Command, args []string) error {
+	ie, err := registry.NewImageEngine(cmd, args)
+	if err != nil {
+		return err
+	}
+
+	if found, err := ie.Exists(registry.GetContext(), args[0]); err != nil {
+		return err
+	} else if found.Value {
+		return images.Diff(cmd, args, diffOpts)
+	}
+
+	ce, err := registry.NewContainerEngine(cmd, args)
+	if err != nil {
+		return err
+	}
+
+	if found, err := ce.ContainerExists(registry.GetContext(), args[0]); err != nil {
+		return err
+	} else if found.Value {
+		return containers.Diff(cmd, args, diffOpts)
+	}
+	return fmt.Errorf("%s not found on system", args[0])
+}