support multi-image (docker) archives

Support loading and saving tarballs with more than one image.
Add a new `/libpod/images/export` endpoint to the rest API to
allow for exporting/saving multiple images into an archive.

Note that a non-release version of containers/image is vendored.
A release version must be vendored before cutting a new Podman
release.  We force the containers/image version via a replace in
the go.mod file; this way go won't try to match the versions.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 17 insertions, 6 deletions

diff --git a/pkg/domain/infra/tunnel/images.go b/pkg/domain/infra/tunnel/images.go
index b255c5da4..185cc2f9a 100644
--- a/pkg/domain/infra/tunnel/images.go
+++ b/pkg/domain/infra/tunnel/images.go
@@ -251,12 +251,23 @@ func (ir *ImageEngine) Save(ctx context.Context, nameOrID string, tags []string,
 		return err
 	}
 
-	exErr := images.Export(ir.ClientCxt, nameOrID, f, &options.Format, &options.Compress)
-	if err := f.Close(); err != nil {
-		return err
-	}
-	if exErr != nil {
-		return exErr
+	if options.MultiImageArchive {
+		exErr := images.MultiExport(ir.ClientCxt, append([]string{nameOrID}, tags...), f, &options.Format, &options.Compress)
+		if err := f.Close(); err != nil {
+			return err
+		}
+		if exErr != nil {
+			return exErr
+		}
+	} else {
+		// FIXME: tags are entirely ignored here but shouldn't.
+		exErr := images.Export(ir.ClientCxt, nameOrID, f, &options.Format, &options.Compress)
+		if err := f.Close(); err != nil {
+			return err
+		}
+		if exErr != nil {
+			return exErr
+		}
 	}
 
 	if options.Format != "oci-dir" && options.Format != "docker-dir" {