this derivation will be built:
  /nix/store/yi7nwfcsk3nnqv9721wv9l4f94kvh6ny-nix-unit-check.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy