NixOS Release 18.03 ("Impala") Highlights, New Services, and Backward Incompatibilities

# Release 18.03 ("Impala", 2018/04/04) {#sec-release-18.03} ## Highlights {#sec-release-18.03-highlights} In addition to numerous new and upgraded packages, this release has the following highlights: - End of support is planned for end of October 2018, handing over to 18.09. - Platform support: x86_64-linux and x86_64-darwin since release time (the latter isn't NixOS, really). Binaries for aarch64-linux are available, but no channel exists yet, as it's waiting for some test fixes, etc. - Nix now defaults to 2.0; see its [release notes](https://nixos.org/nix/manual/#ssec-relnotes-2.0). - Core version changes: linux: 4.9 -\> 4.14, glibc: 2.25 -\> 2.26, gcc: 6 -\> 7, systemd: 234 -\> 237. - Desktop version changes: gnome: 3.24 -\> 3.26, (KDE) plasma-desktop: 5.10 -\> 5.12. - MariaDB 10.2, updated from 10.1, is now the default MySQL implementation. While upgrading a few changes have been made to the infrastructure involved: - `libmysql` has been deprecated, please use `mysql.connector-c` instead, a compatibility passthru has been added to the MySQL packages. - The `mysql57` package has a new `static` output containing the static libraries including `libmysqld.a` - PHP now defaults to PHP 7.2, updated from 7.1. ## New Services {#sec-release-18.03-new-services} The following new services were added since the last release: - `./config/krb5/default.nix` - `./hardware/digitalbitbox.nix` - `./misc/label.nix` - `./programs/ccache.nix` - `./programs/criu.nix` - `./programs/digitalbitbox/default.nix` - `./programs/less.nix` - `./programs/npm.nix` - `./programs/plotinus.nix` - `./programs/rootston.nix` - `./programs/systemtap.nix` - `./programs/sway.nix` - `./programs/udevil.nix` - `./programs/way-cooler.nix` - `./programs/yabar.nix` - `./programs/zsh/zsh-autoenv.nix` - `./services/backup/borgbackup.nix` - `./services/backup/crashplan-small-business.nix` - `./services/desktops/dleyna-renderer.nix` - `./services/desktops/dleyna-server.nix` - `./services/desktops/pipewire.nix` - `./services/desktops/gnome3/chrome-gnome-shell.nix` - `./services/desktops/gnome3/tracker-miners.nix` - `./services/hardware/fwupd.nix` - `./services/hardware/interception-tools.nix` - `./services/hardware/u2f.nix` - `./services/hardware/usbmuxd.nix` - `./services/mail/clamsmtp.nix` - `./services/mail/dkimproxy-out.nix` - `./services/mail/pfix-srsd.nix` - `./services/misc/gitea.nix` - `./services/misc/home-assistant.nix` - `./services/misc/ihaskell.nix` - `./services/misc/logkeys.nix` - `./services/misc/novacomd.nix` - `./services/misc/osrm.nix` - `./services/misc/plexpy.nix` - `./services/misc/pykms.nix` - `./services/misc/tzupdate.nix` - `./services/monitoring/fusion-inventory.nix` - `./services/monitoring/prometheus/exporters.nix` - `./services/network-filesystems/beegfs.nix` - `./services/network-filesystems/davfs2.nix` - `./services/network-filesystems/openafs/client.nix` - `./services/network-filesystems/openafs/server.nix` - `./services/network-filesystems/ceph.nix` - `./services/networking/aria2.nix` - `./services/networking/monero.nix` - `./services/networking/nghttpx/default.nix` - `./services/networking/nixops-dns.nix` - `./services/networking/rxe.nix` - `./services/networking/stunnel.nix` - `./services/web-apps/matomo.nix` - `./services/web-apps/restya-board.nix` - `./services/web-servers/mighttpd2.nix` - `./services/x11/fractalart.nix` - `./system/boot/binfmt.nix` - `./system/boot/grow-partition.nix` - `./tasks/filesystems/ecryptfs.nix` - `./virtualisation/hyperv-guest.nix` ## Backward Incompatibilities {#sec-release-18.03-incompatibilities} When upgrading from a previous release, please be aware of the following incompatible changes: - `sound.enable` now defaults to false. - Dollar signs in options under `services.postfix` are passed verbatim to Postfix, which will interpret them as the beginning of a parameter expression. This was already true for string-valued options in the previous release, but not for list-valued options. If you need to pass literal dollar signs through Postfix, double them.

This document summarizes the key features, new services, and backward incompatibilities introduced in NixOS Release 18.03, codenamed "Impala". It highlights the end of support date, platform support, Nix version update, core and desktop version changes, MariaDB and PHP updates, new services added, and backward-incompatible changes related to sound and Postfix configuration.