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2nd chunk of `nixos/doc/manual/release-notes/rl-1903.section.md`
13bc1f5dde5d65ba18b47dc371baa6da7d8c4a5d33ba5ce20000000100000fd4
  - For users of NixOS 17.09, you will first need to upgrade Nix by setting `nix.package = pkgs.nixStable2;` and run `nixos-rebuild switch` as the `root` user.

  - For users of a daemon-less Nix installation on Linux or macOS, you can upgrade Nix by running `curl -L https://nixos.org/nix/install | sh`, or prior to doing a channel update, running `nix-env -iA nix`. If you have already run a channel update and Nix is no longer able to evaluate Nixpkgs, the error message printed should provide adequate directions for upgrading Nix.

  - For users of the Nix daemon on macOS, you can upgrade Nix by running `sudo -i sh -c 'nix-channel --update && nix-env -iA nixpkgs.nix'; sudo launchctl stop org.nixos.nix-daemon; sudo launchctl start org.nixos.nix-daemon`.

- The `buildPythonPackage` function now sets `strictDeps = true` to help distinguish between native and non-native dependencies in order to improve cross-compilation compatibility. Note however that this may break user expressions.

- The `buildPythonPackage` function now sets `LANG = C.UTF-8` to enable Unicode support. The `glibcLocales` package is no longer needed as a build input.

- The Syncthing state and configuration data has been moved from `services.syncthing.dataDir` to the newly defined `services.syncthing.configDir`, which default to `/var/lib/syncthing/.config/syncthing`. This change makes possible to share synced directories using ACLs without Syncthing resetting the permission on every start.

- The `ntp` module now has sane default restrictions. If you're relying on the previous defaults, which permitted all queries and commands from all firewall-permitted sources, you can set `services.ntp.restrictDefault` and `services.ntp.restrictSource` to `[]`.

- Package `rabbitmq_server` is renamed to `rabbitmq-server`.

- The `light` module no longer uses setuid binaries, but udev rules. As a consequence users of that module have to belong to the `video` group in order to use the executable (i.e. `users.users.yourusername.extraGroups = ["video"];`).

- Buildbot now supports Python 3 and its packages have been moved to `pythonPackages`. The options `services.buildbot-master.package` and `services.buildbot-worker.package` can be used to select the Python 2 or 3 version of the package.

- Options `services.znc.confOptions.networks.name.userName` and `services.znc.confOptions.networks.name.modulePackages` were removed. They were never used for anything and can therefore safely be removed.

- Package `wasm` has been renamed `proglodyte-wasm`. The package `wasm` will be pointed to `ocamlPackages.wasm` in 19.09, so make sure to update your configuration if you want to keep `proglodyte-wasm`

- When the `nixpkgs.pkgs` option is set, NixOS will no longer ignore the `nixpkgs.overlays` option. The old behavior can be recovered by setting `nixpkgs.overlays = lib.mkForce [];`.

- OpenSMTPD has been upgraded to version 6.4.0p1. This release makes backwards-incompatible changes to the configuration file format. See `man smtpd.conf` for more information on the new file format.

- The versioned `postgresql` have been renamed to use underscore number separators. For example, `postgresql96` has been renamed to `postgresql_9_6`.

- Package `consul-ui` and passthrough `consul.ui` have been removed. The package `consul` now uses upstream releases that vendor the UI into the binary. See [\#48714](https://github.com/NixOS/nixpkgs/pull/48714#issuecomment-433454834) for details.

- Slurm introduces the new option `services.slurm.stateSaveLocation`, which is now set to `/var/spool/slurm` by default (instead of `/var/spool`). Make sure to move all files to the new directory or to set the option accordingly.

  The slurmctld now runs as user `slurm` instead of `root`. If you want to keep slurmctld running as `root`, set `services.slurm.user = root`.

  The options `services.slurm.nodeName` and `services.slurm.partitionName` are now sets of strings to correctly reflect that fact that each of these options can occur more than once in the configuration.
Title: NixOS 19.03 Backward Incompatibilities (Continued)
Summary
This section continues detailing backward-incompatible changes introduced in NixOS 19.03. It covers specific upgrade instructions for various Nix installations, changes to the `buildPythonPackage` function, Syncthing's data directory location, NTP module restrictions, package renames (rabbitmq_server, wasm, postgresql, consul-ui), light module user group requirements, Buildbot's Python version support, removed ZNC options, Nixpkgs overlays behavior, OpenSMTPD configuration changes, and Slurm's state save location and user settings.