these 2 derivations will be built:
  /nix/store/3xjp2gb7v310n5xysdnaczx0vnjzf3yh-iets-0.1.0.drv
  /nix/store/077fmcs07v15x8id8xzlc9y383ilhjk8-iets-diff-e2e.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy