these 5 derivations will be built:
  /nix/store/l3s285b36pghnp7klkdbima5432dbl9l-base64-0.23.1.drv
  /nix/store/p7xm933zsdx5drmv7pgkc0drp7ivaxyi-crate-reqwest-0.13.5.tar.gz.drv
  /nix/store/xasxfja0g9sz1jfsvdzgjm6kf96kqdr9-reqwest-0.13.5.drv
  /nix/store/l9zgpgic9fqd264d6dnkz5k0b55qa28l-cargo-vendor-dir.drv
  /nix/store/c738w965h6awqb5fsbi4mgidgvvb9mdq-citiesapp-frontend.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy