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3rd chunk of `nixos/doc/manual/release-notes/rl-1803.section.md`
47056c7bbacf0f6f77c9a16d08d6a7f744b0ee8fddec244e0000000100000f4b
- The propagation logic has been changed. The new logic, along with new types of dependencies that go with, is thoroughly documented in the "Specifying dependencies" section of the "Standard Environment" chapter of the nixpkgs manual. The old logic isn't but is easy to describe: dependencies were propagated as the same type of dependency no matter what. In practice, that means that many `propagatedNativeBuildInputs` should instead be `propagatedBuildInputs`. Thankfully, that was and is the least used type of dependency. Also, it means that some `propagatedBuildInputs` should instead be `depsTargetTargetPropagated`. Other types dependencies should be unaffected.

- `lib.addPassthru drv passthru` is removed. Use `lib.extendDerivation true passthru drv` instead.

- The `memcached` service no longer accept dynamic socket paths via `services.memcached.socket`. Unix sockets can be still enabled by `services.memcached.enableUnixSocket` and will be accessible at `/run/memcached/memcached.sock`.

- The `hardware.amdHybridGraphics.disable` option was removed for lack of a maintainer. If you still need this module, you may wish to include a copy of it from an older version of nixos in your imports.

- The merging of config options for `services.postfix.config` was buggy. Previously, if other options in the Postfix module like `services.postfix.useSrs` were set and the user set config options that were also set by such options, the resulting config wouldn't include all options that were needed. They are now merged correctly. If config options need to be overridden, `lib.mkForce` or `lib.mkOverride` can be used.

- The following changes apply if the `stateVersion` is changed to 18.03 or higher. For `stateVersion = "17.09"` or lower the old behavior is preserved.

  - `matrix-synapse` uses postgresql by default instead of sqlite. Migration instructions can be found [ here ](https://github.com/matrix-org/synapse/blob/master/docs/postgres.rst#porting-from-sqlite).

- The `jid` package has been removed, due to maintenance overhead of a go package having non-versioned dependencies.

- When using `services.xserver.libinput` (enabled by default in GNOME), it now handles all input devices, not just touchpads. As a result, you might need to re-evaluate any custom Xorg configuration. In particular, `Option "XkbRules" "base"` may result in broken keyboard layout.

- The `attic` package was removed. A maintained fork called [Borg](https://www.borgbackup.org/) should be used instead. Migration instructions can be found [here](http://borgbackup.readthedocs.io/en/stable/usage/upgrade.html#attic-and-borg-0-xx-to-borg-1-x).

- The Piwik analytics software was renamed to Matomo:

  - The package `pkgs.piwik` was renamed to `pkgs.matomo`.

  - The service `services.piwik` was renamed to `services.matomo`.

  - The data directory `/var/lib/piwik` was renamed to `/var/lib/matomo`. All files will be moved automatically on first startup, but you might need to adjust your backup scripts.

  - The default `serverName` for the nginx configuration changed from `piwik.${config.networking.hostName}` to `matomo.${config.networking.hostName}.${config.networking.domain}` if `config.networking.domain` is set, `matomo.${config.networking.hostName}` if it is not set. If you change your `serverName`, remember you'll need to update the `trustedHosts[]` array in `/var/lib/matomo/config/config.ini.php` as well.

  - The `piwik` user was renamed to `matomo`. The service will adjust ownership automatically for files in the data directory. If you use unix socket authentication, remember to give the new `matomo` user access to the database and to change the `username` to `matomo` in the `[database]` section of `/var/lib/matomo/config/config.ini.php`.

  - If you named your database \`piwik\`, you might want to rename it to \`matomo\` to keep things clean, but this is neither enforced nor required.
Title: NixOS 18.03: Backward Incompatibilities and Configuration Changes, Continued
Summary
This section continues detailing backward-incompatible changes in NixOS 18.03. It covers updates to Postfix configuration merging, a matrix-synapse default database change (to PostgreSQL), removal of the jid package, handling of input devices with libinput, removal of the attic package (replaced by Borg), and the renaming of Piwik analytics software to Matomo, including package, service, data directory, user, and configuration changes.