add remote-client diff

the remote client now can run the diff command to report changes,
modifications, and deletions in an image or container.

Signed-off-by: baude <bbaude@redhat.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/pkg/adapter/runtime.go b/pkg/adapter/runtime.go
index 6a68a3aea..dd51c7233 100644
--- a/pkg/adapter/runtime.go
+++ b/pkg/adapter/runtime.go
@@ -23,6 +23,7 @@ import (
 	"github.com/containers/libpod/libpod/events"
 	"github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/rootless"
+	"github.com/containers/storage/pkg/archive"
 	"github.com/pkg/errors"
 )
 
@@ -430,3 +431,8 @@ func (r *LocalRuntime) Events(c *cliconfig.EventValues) error {
 	}
 	return nil
 }
+
+// Diff shows the difference in two objects
+func (r *LocalRuntime) Diff(c *cliconfig.DiffValues, to string) ([]archive.Change, error) {
+	return r.Runtime.GetDiff("", to)
+}
diff --git a/pkg/adapter/runtime_remote.go b/pkg/adapter/runtime_remote.go
index dcc2d5aa6..c3a4f322d 100644
--- a/pkg/adapter/runtime_remote.go
+++ b/pkg/adapter/runtime_remote.go
@@ -831,3 +831,30 @@ func (r *LocalRuntime) Events(c *cliconfig.EventValues) error {
 	}
 	return nil
 }
+
+// Diff ...
+func (r *LocalRuntime) Diff(c *cliconfig.DiffValues, to string) ([]archive.Change, error) {
+	var changes []archive.Change
+	reply, err := iopodman.Diff().Call(r.Conn, to)
+	if err != nil {
+		return nil, err
+	}
+	for _, change := range reply {
+		changes = append(changes, archive.Change{Path: change.Path, Kind: stringToChangeType(change.ChangeType)})
+	}
+	return changes, nil
+}
+
+func stringToChangeType(change string) archive.ChangeType {
+	switch change {
+	case "A":
+		return archive.ChangeAdd
+	case "D":
+		return archive.ChangeDelete
+	default:
+		logrus.Errorf("'%s' is unknown archive type", change)
+		fallthrough
+	case "C":
+		return archive.ChangeModify
+	}
+}