mirror of
https://github.com/SebastianWendel/nixpkgs.git
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177 lines
6.6 KiB
XML
177 lines
6.6 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-release-unstable">
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<title>Unstable revision</title>
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<para>In addition to numerous new and upgraded packages, this release has the following highlights:
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<itemizedlist>
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<listitem>
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<para>
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The Haskell packages infrastructure has been re-designed from the ground up.
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NixOS now distributes the latest version of every single package registered on
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<link xlink:href="http://hackage.haskell.org/">Hackage</link>, i.e. well over
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8000 Haskell packages. Further information and usage instructions for the
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improved infrastructure are available at <link
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xlink:href="https://nixos.org/wiki/Haskell">https://nixos.org/wiki/Haskell</link>.
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Users migrating from an earlier release will find also find helpful information
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below, in the list of backwards-incompatible changes.
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</para>
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</listitem>
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<listitem>
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<para>
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Users running an SSH server who worry about the quality of their
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<literal>/etc/ssh/moduli</literal> file with respect to the <link
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xlink:href="https://stribika.github.io/2015/01/04/secure-secure-shell.html">vulnerabilities
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discovered in the Diffie-Hellman key exchange</link> can now replace OpenSSH's
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default version with one they generated themselves using the new
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<literal>services.openssh.moduliFile</literal> option.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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<para>Following new services were added since the last release:
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<itemizedlist>
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<listitem><para><literal>brltty</literal></para></listitem>
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<listitem><para><literal>marathon</literal></para></listitem>
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</itemizedlist>
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</para>
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<para>When upgrading from a previous release, please be aware of the
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following incompatible changes:
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<itemizedlist>
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<listitem><para>Steam now doesn't need root rights to work. Instead of using
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<literal>*-steam-chrootenv</literal>, you should now just run <literal>steam</literal>.
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<literal>steamChrootEnv</literal> package was renamed to <literal>steam</literal>,
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and old <literal>steam</literal> package -- to <literal>steamOriginal</literal>.
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</para></listitem>
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<listitem><para>CMPlayer has been renamed to bomi upstream. Package <literal>cmplayer</literal>
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was accordingly renamed to <literal>bomi</literal>
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</para></listitem>
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<listitem><para>Atom Shell has been renamed to Electron upstream. Package <literal>atom-shell</literal>
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was accordingly renamed to <literal>electron</literal>
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</para></listitem>
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<listitem>
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<para>
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The default <literal>NIX_PATH</literal> for NixOS now includes
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<literal>/nix/var/nix/profiles/per-user/root/channels</literal>, so it's
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easy to add custom channels.
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</para>
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<para>
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Moreover, whenever a <command>nixos-rebuild <action>
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--upgrade</command> is issued, every channel that includes a file
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called <filename>.update-on-nixos-rebuild</filename> will be upgraded
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alongside of the <literal>nixos</literal> channel.
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</para>
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</listitem>
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<listitem>
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<para>
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The CUPS printing service has been updated to version <literal>2.0.2</literal>.
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Furthermore its systemd service has been renamed to <literal>cups.service</literal>.
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</para>
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<para>
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Local printers are no longer shared or advertised by default. This behavior
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can be changed by enabling <literal>services.printing.defaultShared</literal>
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or <literal>services.printing.browsing</literal> respectively.
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</para>
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</listitem>
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<listitem>
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<para>
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HPLIP (printer, scanner, and fax drivers for HP devices) has
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been updated to version <literal>3.15.4</literal>. This release
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adds support for the <literal>arm6l-linux</literal> and
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<literal>arm7l-linux</literal> platforms.
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</para>
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</listitem>
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<listitem>
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<para>
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Haskell packages can no longer be found by name, i.e. the commands
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<literal>nix-env -qa cabal-install</literal> and <literal>nix-env -i
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ghc</literal> will fail, even though we <emphasis>do</emphasis> ship
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both <literal>cabal-install</literal> and <literal>ghc</literal>.
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The reason for this inconvenience is the sheer size of the Haskell
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package set: name-based lookups such as these would become much
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slower than they are today if we'd add the entire Hackage database
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into the top level attribute set. Instead, the list of Haskell
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packages can be displayed by
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</para>
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<programlisting>
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nix-env -f "<nixpkgs>" -qaP -A haskellPackages
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</programlisting>
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<para>
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and packages can be installed with:
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</para>
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<programlisting>
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nix-env -f "<nixpkgs>" -iA haskellPackages.cabal-install
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</programlisting>
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</listitem>
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<listitem>
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<para>
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Previous versions of NixOS come with a feature called
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<literal>ghc-wrapper</literal>, a small wrapper script that allows
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GHC to transparently pick up on libraries installed in the user's
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profile. This feature has been deprecated;
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<literal>ghc-wrapper</literal> was removed from the distribution.
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The proper way to register Haskell libraries with the compiler now
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is the <literal>haskellPackages.ghcWithPackages</literal>
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function.
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<link xlink:href="https://nixos.org/wiki/Haskell">https://nixos.org/wiki/Haskell</link>
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provides much information about this subject.
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</para>
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</listitem>
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<listitem>
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<para>
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All Haskell builds that have been generated with version 1.x of
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the <literal>cabal2nix</literal> utility are now invalid and need
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to be re-generated with a current version of
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<literal>cabal2nix</literal> to function. The most recent version
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of this tool can be installed by running
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<literal>nix-env -i cabal2nix</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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The <literal>haskellPackages</literal> set in Nixpkgs used to have a
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function attribute called <literal>extension</literal> that users
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could override in their <literal>~/.nixpkgs/config.nix</literal>
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files to configure additional attributes, etc. That function still
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exists, but it's now called <literal>overrides</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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The OpenBLAS library has been updated to version
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<literal>0.2.14</literal>. Support for the
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<literal>x86_64-darwin</literal> platform was added. Dynamic
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architecture detection was enabled; OpenBLAS now selects
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microarchitecture-optimized routines at runtime, so optimal
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performance is achieved without the need to rebuild OpenBLAS
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locally. OpenBLAS has replaced ATLAS in most packages which use an
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optimized BLAS or LAPACK implementation.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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</chapter>
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