these 3 derivations will be built:
  /nix/store/zfavwnji6i7c6gvi1xljss9pf348r8sw-iets-0.1.0.drv
  /nix/store/bi6gfq5776mnaq4rimv69rcr6m10xkhn-iets-conformance-adapter.drv
  /nix/store/kmdylv6sk9kshqwbs2ingffk8zpbjps3-nix-conformance-iets.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy