Release 16.03 ("Emu", 2016/03/31)

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

Systemd 229, bringing numerous improvements over 217.
Linux 4.4 (was 3.18).
GCC 5.3 (was 4.9). Note that GCC 5 changes the C++ ABI in an incompatible way; this may cause problems if you try to link objects compiled with different versions of GCC.
Glibc 2.23 (was 2.21).
Binutils 2.26 (was 2.23.1). See #909
Improved support for ensuring bitwise reproducible builds. For example, stdenv now sets the environment variable SOURCE_DATE_EPOCH to a deterministic value, and Nix has gained an option to repeat a build a number of times to test determinism. An ongoing project, the goal of exact reproducibility is to allow binaries to be verified independently (e.g., a user might only trust binaries that appear in three independent binary caches).
Perl 5.22.

The following new services were added since the last release:

services/monitoring/longview.nix
hardware/video/webcam/facetimehd.nix
i18n/input-method/default.nix
i18n/input-method/fcitx.nix
i18n/input-method/ibus.nix
i18n/input-method/nabi.nix
i18n/input-method/uim.nix
programs/fish.nix
security/acme.nix
security/audit.nix
security/oath.nix
services/hardware/irqbalance.nix
services/mail/dspam.nix
services/mail/opendkim.nix
services/mail/postsrsd.nix
services/mail/rspamd.nix
services/mail/rmilter.nix
services/misc/autofs.nix
services/misc/bepasty.nix
services/misc/calibre-server.nix
services/misc/cfdyndns.nix
services/misc/gammu-smsd.nix
services/misc/mathics.nix
services/misc/matrix-synapse.nix
services/misc/octoprint.nix
services/monitoring/hdaps.nix
services/monitoring/heapster.nix
services/monitoring/longview.nix
services/network-filesystems/netatalk.nix
services/network-filesystems/xtreemfs.nix
services/networking/autossh.nix
services/networking/dnschain.nix
services/networking/gale.nix
services/networking/miniupnpd.nix
services/networking/namecoind.nix
services/networking/ostinato.nix
services/networking/pdnsd.nix
services/networking/shairport-sync.nix
services/networking/supplicant.nix
services/search/kibana.nix
services/security/haka.nix
services/security/physlock.nix
services/web-apps/pump.io.nix
services/x11/hardware/libinput.nix
services/x11/window-managers/windowlab.nix
system/boot/initrd-network.nix
system/boot/initrd-ssh.nix
system/boot/loader/loader.nix
system/boot/networkd.nix
system/boot/resolved.nix
virtualisation/lxd.nix
virtualisation/rkt.nix

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

We no longer produce graphical ISO images and VirtualBox images for i686-linux. A minimal ISO image is still provided.
Firefox and similar browsers are now wrapped by default. The package and attribute names are plain firefox or midori, etc. Backward-compatibility attributes were set up, but note that nix-env -u will not update your current firefox-with-plugins; you have to uninstall it and install firefox instead.
wmiiSnap has been replaced with wmii_hg, but services.xserver.windowManager.wmii.enable has been updated respectively so this only affects you if you have explicitly installed wmiiSnap.
jobs NixOS option has been removed. It served as compatibility layer between Upstart jobs and SystemD services. All services have been rewritten to use systemd.services
wmiimenu is removed, as it has been removed by the developers upstream. Use wimenu from the wmii-hg package.
Gitit is no longer automatically added to the module list in NixOS and as such there will not be any manual entries for it. You will need to add an import statement to your NixOS configuration in order to use it, e.g.
```
{ imports = [ <nixpkgs/nixos/modules/services/misc/gitit.nix> ]; }
```
will include the Gitit service configuration options.
nginx does not accept flags for enabling and disabling modules anymore. Instead it accepts modules argument, which is a list of modules to be built in. All modules now reside in nginxModules set. Example configuration:
```
nginx.override {
  modules = [
    nginxModules.rtmp
    nginxModules.dav
    nginxModules.moreheaders
  ];
}
```
s3sync is removed, as it hasn't been developed by upstream for 4 years and only runs with ruby 1.8. For an actively-developer alternative look at tarsnap and others.
ruby_1_8 has been removed as it's not supported from upstream anymore and probably contains security issues.
tidy-html5 package is removed. Upstream only provided (lib)tidy5 during development, and now they went back to (lib)tidy to work as a drop-in replacement of the original package that has been unmaintained for years. You can (still) use the html-tidy package, which got updated to a stable release from this new upstream.
extraDeviceOptions argument is removed from bumblebee package. Instead there are now two separate arguments: extraNvidiaDeviceOptions and extraNouveauDeviceOptions for setting extra X11 options for nvidia and nouveau drivers, respectively.
The Ctrl+Alt+Backspace key combination no longer kills the X server by default. There's a new option services.xserver.enableCtrlAltBackspace allowing to enable the combination again.
emacsPackagesNg now contains all packages from the ELPA, MELPA, and MELPA Stable repositories.
Data directory for Postfix MTA server is moved from /var/postfix to /var/lib/postfix. Old configurations are migrated automatically. service.postfix module has also received many improvements, such as correct directories' access rights, new aliasFiles and mapFiles options and more.

Filesystem options should now be configured as a list of strings, not a comma-separated string. The old style will continue to work, but print a warning, until the 16.09 release. An example of the new style:

{
  fileSystems."/example" = {
    device = "/dev/sdc";
    fsType = "btrfs";
    options = [
      "noatime"
      "compress=lzo"
      "space_cache"
      "autodefrag"
    ];
  };
}

CUPS, installed by services.printing module, now has its data directory in /var/lib/cups. Old configurations from /etc/cups are moved there automatically, but there might be problems. Also configuration options services.printing.cupsdConf and services.printing.cupsdFilesConf were removed because they had been allowing one to override configuration variables required for CUPS to work at all on NixOS. For most use cases, services.printing.extraConf and new option services.printing.extraFilesConf should be enough; if you encounter a situation when they are not, please file a bug.

There are also Gutenprint improvements; in particular, a new option services.printing.gutenprint is added to enable automatic updating of Gutenprint PPMs; it's greatly recommended to enable it instead of adding gutenprint to the drivers list.
services.xserver.vaapiDrivers has been removed. Use hardware.opengl.extraPackages{,32} instead. You can also specify VDPAU drivers there.
programs.ibus moved to i18n.inputMethod.ibus. The option programs.ibus.plugins changed to i18n.inputMethod.ibus.engines and the option to enable ibus changed from programs.ibus.enable to i18n.inputMethod.enabled. i18n.inputMethod.enabled should be set to the used input method name, "ibus" for ibus. An example of the new style:
```
{
  i18n.inputMethod.enabled = "ibus";
  i18n.inputMethod.ibus.engines = with pkgs.ibus-engines; [
    anthy
    mozc
  ];
}
```
That is equivalent to the old version:
```
{
  programs.ibus.enable = true;
  programs.ibus.plugins = with pkgs; [
    ibus-anthy
    mozc
  ];
}
```
services.udev.extraRules option now writes rules to 99-local.rules instead of 10-local.rules. This makes all the user rules apply after others, so their results wouldn't be overridden by anything else.
Large parts of the services.gitlab module have been rewritten. There are new configuration options available. The stateDir option was renamed to statePath and the satellitesDir option was removed. Please review the currently available options.
The option services.nsd.zones.<name>.data no longer interpret the dollar sign ($) as a shell variable, as such it should not be escaped anymore. Thus the following zone data:
```
$ORIGIN example.com.
$TTL 1800
@       IN      SOA     ns1.vpn.nbp.name.      admin.example.com. (
```
Should modified to look like the actual file expected by nsd:
```
$ORIGIN example.com.
$TTL 1800
@       IN      SOA     ns1.vpn.nbp.name.      admin.example.com. (
```

service.syncthing.dataDir options now has to point to exact folder where syncthing is writing to. Example configuration should look something like:

{
  services.syncthing = {
    enable = true;
    dataDir = "/home/somebody/.syncthing";
    user = "somebody";
  };
}

networking.firewall.allowPing is now enabled by default. Users are encouraged to configure an appropriate rate limit for their machines using the Kernel interface at /proc/sys/net/ipv4/icmp_ratelimit and /proc/sys/net/ipv6/icmp/ratelimit or using the firewall itself, i.e. by setting the NixOS option networking.firewall.pingLimit.
Systems with some broadcom cards used to result into a generated config that is no longer accepted. If you get errors like
```
error: path ‘/nix/store/*-broadcom-sta-*’ does not exist and cannot be created
```
you should either re-run nixos-generate-config or manually replace "${config.boot.kernelPackages.broadcom_sta}" by config.boot.kernelPackages.broadcom_sta in your /etc/nixos/hardware-configuration.nix. More discussion is on the github issue.
The services.xserver.startGnuPGAgent option has been removed. GnuPG 2.1.x changed the way the gpg-agent works, and that new approach no longer requires (or even supports) the "start everything as a child of the agent" scheme we've implemented in NixOS for older versions. To configure the gpg-agent for your X session, add the following code to ~/.bashrc or some file that's sourced when your shell is started:
```
GPG_TTY=$(tty)
export GPG_TTY
```
If you want to use gpg-agent for SSH, too, add the following to your session initialization (e.g. displayManager.sessionCommands)
```
    gpg-connect-agent /bye
    unset SSH_AGENT_PID
    export SSH_AUTH_SOCK="''${HOME}/.gnupg/S.gpg-agent.ssh"
```
and make sure that
```
    enable-ssh-support
```
is included in your ~/.gnupg/gpg-agent.conf. You will need to use ssh-add to re-add your ssh keys. If gpg's automatic transformation of the private keys to the new format fails, you will need to re-import your private keyring as well:
```
    gpg --import ~/.gnupg/secring.gpg
```
The gpg-agent(1) man page has more details about this subject, i.e. in the "EXAMPLES" section.

Other notable improvements:

ejabberd module is brought back and now works on NixOS.
Input method support was improved. New NixOS modules (fcitx, nabi and uim), fcitx engines (chewing, hangul, m17n, mozc and table-other) and ibus engines (hangul and m17n) have been added.

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Release 16.03 ("Emu", 2016/03/31)

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