Add 2.2 release notes
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Eelco Dolstra
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44a8b17556
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bbaf865655
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version="5.0"
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xml:id="ssec-relnotes-2.2">
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<title>Release 2.2 (201?-??-??)</title>
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<title>Release 2.2 (2019-01-11)</title>
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<para>This release has the following changes:</para>
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<para>This is primarily a bug fix release. It also has the following
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changes:</para>
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<itemizedlist>
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<listitem>
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<para>In derivations that use structured attributes (i.e. that
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specify set the <varname>__structuredAttrs</varname> attribute to
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<literal>true</literal> to cause all attributes to be passed to
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the builder in JSON format), you can now specify closure checks
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per output, e.g.:
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<programlisting>
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outputChecks."out" = {
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# The closure of 'out' must not be larger than 256 MiB.
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maxClosureSize = 256 * 1024 * 1024;
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# It must not refer to C compiler or to the 'dev' output.
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disallowedRequisites = [ stdenv.cc "dev" ];
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};
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outputChecks."dev" = {
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# The 'dev' output must not be larger than 128 KiB.
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maxSize = 128 * 1024;
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};
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>The derivation attribute
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<varname>requiredSystemFeatures</varname> is now enforced for
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local builds, and not just to route builds to remote builders.
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The supported features of a machine can be specified through the
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configuration setting <varname>system-features</varname>.
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</para>
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configuration setting <varname>system-features</varname>.</para>
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<para>By default, <varname>system-features</varname> includes
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<literal>kvm</literal> if <filename>/dev/kvm</filename>
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exists. For compatibility, it also includes the pseudo-features
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<literal>nixos-test</literal>, <literal>benchmark</literal> and
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<literal>big-parallel</literal> which are used by Nixpkgs to route
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builds to particular Hydra build machines.</para>
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</listitem>
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<listitem>
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<para>Sandbox builds are now enabled by default on Linux.</para>
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</listitem>
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<listitem>
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<para>The new command <command>nix doctor</command> shows
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potential issues with your Nix installation.</para>
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</listitem>
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<listitem>
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<para>The <literal>fetchGit</literal> builtin function now uses a
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caching scheme that puts different remote repositories in distinct
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local repositories, rather than a single shared repository. This
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may require more disk space but is faster.</para>
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</listitem>
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<listitem>
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<para>The <literal>dirOf</literal> builtin function now works on
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relative paths.</para>
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</listitem>
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<listitem>
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<para>Nix now supports <link
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xlink:href="https://www.w3.org/TR/SRI/">SRI hashes</link>,
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allowing the hash algorithm and hash to be specified in a single
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string. For example, you can write:
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<programlisting>
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import <nix/fetchurl.nix> {
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url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
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hash = "sha256-XSLa0FjVyADWWhFfkZ2iKTjFDda6mMXjoYMXLRSYQKQ=";
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};
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</programlisting>
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instead of
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<programlisting>
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import <nix/fetchurl.nix> {
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url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
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sha256 = "5d22dad058d5c800d65a115f919da22938c50dd6ba98c5e3a183172d149840a4";
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};
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</programlisting>
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</para>
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<para>In fixed-output derivations, the
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<varname>outputHashAlgo</varname> attribute is no longer mandatory
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if <varname>outputHash</varname> specifies the hash.</para>
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<para><command>nix hash-file</command> and <command>nix
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hash-path</command> now print hashes in SRI format by
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default. They also use SHA-256 by default instead of SHA-512
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because that's what we use most of the time in Nixpkgs.</para>
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</listitem>
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<listitem>
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<para>Integers are now 64 bits on all platforms.</para>
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</listitem>
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<listitem>
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<para>The evaluator now prints profiling statistics (enabled via
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the <envar>NIX_SHOW_STATS</envar> and
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<envar>NIX_COUNT_CALLS</envar> environment variables) in JSON
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format.</para>
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</listitem>
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<listitem>
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<para>The option <option>--xml</option> in <command>nix-store
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--query</command> has been removed. Instead, there now is an
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option <option>--graphml</option> to output the dependency graph
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in GraphML format.</para>
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</listitem>
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<listitem>
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<para>All <filename>nix-*</filename> commands are now symlinks to
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<filename>nix</filename>. This saves a bit of disk space.</para>
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</listitem>
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<listitem>
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<para><command>nix repl</command> now uses
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<literal>libeditline</literal> or
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<literal>libreadline</literal>.</para>
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</listitem>
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</itemizedlist>
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</section>
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