# Release 20.03 (“Markhor”, 2020.03/??)

## Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

- Support is planned until the end of October 2020, handing over to 20.09.

- Postgresql for NixOS service now defaults to v11.

- The graphical installer image starts the graphical session automatically. Before you'd be greeted by a tty and asked to enter `systemctl start display-manager`. It is now possible to disable the display-manager from running by selecting the `Disable display-manager` quirk in the boot menu.

- By default zfs pools will now be trimmed on a weekly basis. Trimming is only done on supported devices (i.e. NVME or SSDs) and should improve throughput and lifetime of these devices. It is controlled by the `services.zfs.trim.enable` varname. The zfs scrub service (`services.zfs.autoScrub.enable`) and the zfs autosnapshot service (`services.zfs.autoSnapshot.enable`) are now only enabled if zfs is set in `config.boot.initrd.supportedFilesystems` or `config.boot.supportedFilesystems`. These lists will automatically contain zfs as soon as any zfs mountpoint is configured in `fileSystems`.

- `nixos-option` has been rewritten in C++, speeding it up, improving correctness, and adding a `--all` option which prints all options and their values.

- `services.xserver.desktopManager.default` and `services.xserver.windowManager.default` options were replaced by a single option to improve support for upstream session files. If you used something like:

      services.xserver.desktopManager.default = "xfce";
      services.xserver.windowManager.default = "icewm";

  you should change it to:

      services.xserver.displayManager.defaultSession = "xfce+icewm";

## New Services

The following new services were added since the last release:

- The kubernetes kube-proxy now supports a new hostname configuration `services.kubernetes.proxy.hostname` which has to be set if the hostname of the node should be non default.

- UPower's configuration is now managed by NixOS and can be customized via `services.upower`.

## Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

- GnuPG is now built without support for a graphical passphrase entry by default. Please enable the `gpg-agent` user service via the NixOS option `programs.gnupg.agent.enable`. Note that upstream recommends using `gpg-agent` and will spawn a `gpg-agent` on the first invocation of GnuPG anyway.

- The `dynamicHosts` option has been removed from the networkd module. Allowing (multiple) regular users to override host entries affecting the whole system opens up a huge attack vector. There seem to be very rare cases where this might be useful. Consider setting system-wide host entries using networking.hosts, provide them via the DNS server in your network, or use environment.etc to add a file into `/etc/NetworkManager/dnsmasq.d` reconfiguring `hostsdir`.

- The `99-main.network` file was removed. Maching all network interfaces caused many breakages, see #18962 and #71106.

  We already don't support the global networking.useDHCP, networking.defaultGateway and networking.defaultGateway6 options if networking.useNetworkd is enabled, but direct users to configure the per-device networking.interfaces.<name>.… options.

- The stdenv now runs all bash with `set -u`, to catch the use of undefined variables. Before, it itself used `set -u` but was careful to unset it so other packages' code ran as before. Now, all bash code is held to the same high standard, and the rather complex stateful manipulation of the options can be discarded.

- The SLIM Display Manager has been removed, as it has been unmaintained since 2013. Consider migrating to a different display manager such as LightDM (current default in NixOS), SDDM, GDM, or using the startx module which uses Xinitrc.

- The BEAM package set has been deleted. You will only find there the different interpreters. You should now use the different build tools coming with the languages with sandbox mode disabled.

- There is now only one Xfce package-set and module. This means attributes, `xfce4-14` `xfce4-12`, and `xfceUnstable` all now point to the latest Xfce 4.14 packages. And in future NixOS releases will be the latest released version of Xfce available at the time during the releases development (if viable).

- The phpfpm module now sets `PrivateTmp=true` in its systemd units for better process isolation. If you rely on `/tmp` being shared with other services, explicitly override this by setting `serviceConfig.PrivateTmp` to `false` for each phpfpm unit.

- KDE’s old multimedia framework Phonon no longer supports Qt 4. For that reason, Plasma desktop also does not have `enableQt4Support` option any more.

- The BeeGFS module has been removed.

- The osquery module has been removed.

- Going forward, `~/bin` in the users home directory will no longer be in `PATH` by default. If you depend on this you should set the option `environment.homeBinInPath` to `true`. The aforementioned option was added this release.

- The `buildRustCrate` infrastructure now produces `lib` outputs in addition to the `out` output. This has led to drastically reduced closed sizes for some rust crates since development dependencies are now in the `lib` output.

- Pango was upgraded to 1.44, which no longer uses freetype for font loading. This means that type1 and bitmap fonts are no longer supported in applications relying on Pango for font rendering (notably, GTK application). See upstream issue for more information.

- The packages `openobex` and `obexftp` are no longer installed when enabling Bluetooth via `hardware.bluetooth.enable`.

- The `dump1090` derivation has been changed to use FlightAware's dump1090 as its upstream. However, this version does not have an internal webserver anymore. The assets in the `share/dump1090` directory of the derivation can be used in conjunction with an external webserver to replace this functionality.

- The fourStore and fourStoreEndpoint modules have been removed.

- Polkit no longer has the user of uid 0 (root) as an admin identity. We now follow the upstream default of only having every member of the wheel group admin privileged. Before it was root and members of wheel. The positive outcome of this is pkexec GUI popups or terminal prompts will no longer require the user to choose between two essentially equivalent choices (whether to perform the action as themselves with wheel permissions, or as the root user).

- NixOS containers no longer build NixOS manual by default. This saves evaluation time, especially if there are many declarative containers defined. Note that this is already done when `<nixos/modules/profiles/minimal.nix>` module is included in container config.

- The `kresd` services deprecates the `interfaces` option in favor of the `listenPlain` option which requires full systemd.socket compatible declaration which always include a port.

- Virtual console options have been reorganized and can be found under a single top-level attribute: `console`. The full set of changes is as follows:

  - `i18n.consoleFont` renamed to console.font

  - `i18n.consoleKeyMap` renamed to console.keyMap

  - `i18n.consoleColors` renamed to console.colors

  - `i18n.consolePackages` renamed to console.packages

  - `i18n.consoleUseXkbConfig` renamed to console.useXkbConfig

  - `boot.earlyVconsoleSetup` renamed to console.earlySetup

  - `boot.extraTTYs` renamed to console.extraTTYs

- The awstats module has been rewritten to serve stats via static html pages, updated on a timer, over nginx, instead of dynamic cgi pages over apache.

  Minor changes will be required to migrate existing configurations. Details of the required changes can seen by looking through the awstats module.

- The httpd module no longer provides options to support serving web content without defining a virtual host. As a result of this the services.httpd.logPerVirtualHost option now defaults to `true` instead of `false`. Please update your configuration to make use of services.httpd.virtualHosts.

  The services.httpd.virtualHosts.<name> option has changed type from a list of submodules to an attribute set of submodules, better matching services.nginx.virtualHosts.<name>.

  This change comes with the addition of the following options which mimic the functionality of their `nginx` counterparts: services.httpd.virtualHosts.<name>.addSSL, services.httpd.virtualHosts.<name>.forceSSL, services.httpd.virtualHosts.<name>.onlySSL, services.httpd.virtualHosts.<name>.enableACME, services.httpd.virtualHosts.<name>.acmeRoot, and services.httpd.virtualHosts.<name>.useACMEHost.

## Other Notable Changes

- SD images are now compressed by default using `bzip2`.

- The nginx web server previously started its master process as root privileged, then ran worker processes as a less privileged identity user. This was changed to start all of nginx as a less privileged user (defined by `services.nginx.user` and `services.nginx.group`). As a consequence, all files that are needed for nginx to run (included configuration fragments, SSL certificates and keys, etc.) must now be readable by this less privileged user/group.

- OpenSSH has been upgraded from 7.9 to 8.1, improving security and adding features but with potential incompatibilities. Consult the release announcement for more information.

- `PRETTY_NAME` in `/etc/os-release` now uses the short rather than full version string.