Ensure content is fetched on save

Signed-off-by: apostasie <[email protected]>

pkg/cmd/image/save.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/containerd/nerdctl/v2/pkg/api/types"
 	"github.com/containerd/nerdctl/v2/pkg/idutil/imagewalker"
+	"github.com/containerd/nerdctl/v2/pkg/imgutil"
 	"github.com/containerd/nerdctl/v2/pkg/platformutil"
 	"github.com/containerd/nerdctl/v2/pkg/strutil"
 )
@@ -48,6 +49,11 @@ func Save(ctx context.Context, client *containerd.Client, images []string, optio
 			if found.UniqueImages > 1 {
 				return fmt.Errorf("ambiguous digest ID: multiple IDs found with provided prefix %s", found.Req)
 			}
+			err = imgutil.EnsureAllContent(ctx, client, found.Image.Name, found.Image.Target, "", options.GOptions)
+			if err != nil {
+				return err
+			}
+
 			imgName := found.Image.Name
 			imgDigest := found.Image.Target.Digest.String()
 			if _, ok := savedImages[imgDigest]; !ok {