In addition to numerous new and upgraded packages, this release has the following highlights: End of support is planned for end of April 2020, handing over to 20.03. PHP now defaults to PHP 7.3, updated from 7.2.

The following new services were added since the last release:

When upgrading from a previous release, please be aware of the following incompatible changes: Buildbot no longer supports Python 2, as support was dropped upstream in version 2.0.0. Configurations may need to be modified to make them compatible with Python 3. PostgreSQL now uses /run/postgresql as its socket directory instead of /tmp. So if you run an application like eg. Nextcloud, where you need to use the Unix socket path as the database host name, you need to change it accordingly. The options services.prometheus.alertmanager.user and services.prometheus.alertmanager.group have been removed because the alertmanager service is now using systemd's DynamicUser mechanism which obviates these options. The NetworkManager systemd unit was renamed back from network-manager.service to NetworkManager.service for better compatibility with other applications expecting this name. The same applies to ModemManager where modem-manager.service is now called ModemManager.service again. The services.nzbget.configFile and services.nzbget.openFirewall options were removed as they are managed internally by the nzbget. The services.nzbget.dataDir option hadn't actually been used by the module for some time and so was removed as cleanup. The services.mysql.pidDir option was removed, as it was only used by the wordpress apache-httpd service to wait for mysql to have started up. This can be accomplished by either describing a dependency on mysql.service (preferred) or waiting for the (hardcoded) /run/mysqld/mysql.sock file to appear. The services.emby.enable module has been removed, see services.jellyfin.enable instead for a free software fork of Emby. See the Jellyfin documentation: Migrating from Emby to Jellyfin Since Bittorrent Sync was superseded by Resilio Sync in 2016, the bittorrentSync, bittorrentSync14, and bittorrentSync16 packages have been removed in favor of resilio-sync. The corresponding module, services.btsync has been replaced by the services.resilio module. The limesurvey apache subservice was replaced with a full NixOS module. One can configure it using the services.limesurvey.enable and services.limesurvey.virtualHost options. The option systemd.network.networks.<name>.routes.*.routeConfig.GatewayOnlink was renamed to systemd.network.networks.<name>.routes.*.routeConfig.GatewayOnLink (capital L). This follows upstreams renaming of the setting. As of this release the NixOps feature autoLuks is deprecated. It no longer works with our systemd version without manual intervention. Whenever the usage of the module is detected the evaluation will fail with a message explaining why and how to deal with the situation. A new knob named nixops.enableDeprecatedAutoLuks has been introduced to disable the eval failure and to acknowledge the notice was received and read. If you plan on using the feature please note that it might break with subsequent updates. Make sure you set the _netdev option for each of the file systems referring to block devices provided by the autoLuks module. Not doing this might render the system in a state where it doesn't boot anymore. If you are actively using the autoLuks module please let us know in issue #62211. The setopt declarations will be evaluated at the end of /etc/zshrc, so any code in , and may break if it relies on those options being set.

The documentation module gained an option named documentation.nixos.includeAllModules which makes the generated configuration.nix 5 manual page include all options from all NixOS modules included in a given configuration.nix configuration file. Currently, it is set to false by default as enabling it frequently prevents evaluation. But the plan is to eventually have it set to true by default. Please set it to true now in your configuration.nix and fix all the bugs it uncovers. The vlc package gained support for Chromecast streaming, enabled by default. TCP port 8010 must be open for it to work, so something like networking.firewall.allowedTCPPorts = [ 8010 ]; may be required in your configuration. Also consider enabling Accelerated Video Playback for better transcoding performance. The following changes apply if the stateVersion is changed to 19.09 or higher. For stateVersion = "19.03" or lower the old behavior is preserved. solr.package defaults to pkgs.solr_8. The hunspellDicts.fr-any dictionary now ships with fr_FR.{aff,dic} which is linked to fr-toutesvariantes.{aff,dic}. The mysql service now runs as mysql user. Previously, systemd did execute it as root, and mysql dropped privileges itself. This includes ExecStartPre= and ExecStartPost= phases. To accomplish that, runtime and data directory setup was delegated to RuntimeDirectory and tmpfiles. With the upgrade to systemd version 242 the systemd-timesyncd service is no longer using DynamicUser=yes. In order for the upgrade to work we rely on an activation script to move the state from the old to the new directory. The older directory (prior 19.09) was /var/lib/private/systemd/timesync. As long as the system.config.stateVersion is below 19.09 the state folder will migrated to its proper location (/var/lib/systemd/timesync), if required. The package avahi is now built to look up service definitions from /etc/avahi/services instead of its output directory in the nix store. Accordingly the module avahi now supports custom service definitions via services.avahi.extraServiceFiles, which are then placed in the aforementioned directory. See avahi.service5 for more information on custom service definitions. Since version 0.1.19, cargo-vendor honors package includes that are specified in the Cargo.toml file of Rust crates. rustPlatform.buildRustPackage uses cargo-vendor to collect and build dependent crates. Since this change in cargo-vendor changes the set of vendored files for most Rust packages, the hash that use used to verify the dependencies, cargoSha256, also changes. The cargoSha256 hashes of all in-tree derivations that use buildRustPackage have been updated to reflect this change. However, third-party derivations that use buildRustPackage may have to be updated as well. The default resample-method for PulseAudio has been changed from the upstream default speex-float-1 to speex-float-5. Be aware that low-powered ARM-based and MIPS-based boards will struggle with this so you'll need to set hardware.pulseaudio.daemon.config.resample-method back to speex-float-1. The phabricator package and associated httpd.extraSubservice, as well as the phd service have been removed from nixpkgs due to lack of maintainer.