fix: check for nil PreCopy

Signed-off-by: Kyle M. Tarplee <[email protected]>
oras-project · Oct 31, 2023 · 46b08cb · 46b08cb
1 parent 75c7e96
commit 46b08cb
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/copy.go b/copy.go
@@ -122,7 +122,11 @@ func (opts *CopyGraphOptions) WithMount(sourceRepository string, mounter registr
 	opts.PreCopy = func(ctx context.Context, desc ocispec.Descriptor) error {
 		// Only care to mount blobs
 		if descriptor.IsManifest(desc) {
-			return preCopy(ctx, desc)
+			// still want to call PreCopy if it is a manifest
+			if preCopy != nil {
+				return preCopy(ctx, desc)
+			}
+			return nil
 		}
 
 		var mountFailed bool