···183183 // Try to acquire a lock on an existing NAR
184184 let existing_nar = database.find_and_lock_nar(&upload_info.nar_hash).await?;
185185 match existing_nar {
186186- // FIXME: existing NAR may be missing chunks
187186 Some(existing_nar) => {
188187 // Deduplicate?
189188 let missing_chunk = ChunkRef::find()