* Release notes.
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Eelco Dolstra
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<article xmlns="http://docbook.org/ns/docbook">
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<article xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Nix Release Notes</title>
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@ -36,6 +37,9 @@ irreversible.</para></warning>
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derivations, you need to specify
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<literal>\*</literal>.</para></listitem>
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<listitem><para>Berkeley DB 4.4’s process registry feature is used
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to recover from crashed Nix processes.</para></listitem>
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<!-- <listitem><para>TODO: shared stores.</para></listitem> -->
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<listitem><para>A performance issue has been fixed with the
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@ -52,27 +56,142 @@ irreversible.</para></warning>
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nix-store</literal> without triggering a database
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recovery.</para></listitem>
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<listitem><para>Reference scanning (which happens after each build)
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is much faster.</para></listitem>
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<listitem><para>TODO: string interpolation</para></listitem>
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<listitem><para>New language features:
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<listitem><para>TODO: string concatenations involving
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derivations</para></listitem>
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<itemizedlist>
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<listitem><para>TODO: function argument default values can refer to
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other function arguments</para></listitem>
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<listitem><para>Reference scanning (which happens after each
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build) is much faster.</para></listitem>
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<listitem><para>String interpolation. Expressions like
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<programlisting>
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"--with-freetype2-library=" + freetype + "/lib"</programlisting>
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can now be written as
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<programlisting>
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"--with-freetype2-library=${freetype}/lib"</programlisting>
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You can write arbitrary expressions within
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<literal>${<replaceable>...</replaceable>}</literal>, not just
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identifiers.</para></listitem>
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<listitem><para>Multi-line string literals.</para></listitem>
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<listitem><para>TODO: string concatenations involving
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derivations. Consequently, the subpath operator
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(<literal>~</literal>) has been deprecated.</para></listitem>
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<listitem><para>TODO: function argument default values can refer
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to other function arguments</para></listitem>
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<listitem><para>TODO: domain checks (r5895).</para></listitem>
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</itemizedlist>
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</para></listitem>
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<listitem><para>If the top-level Nix expression used by
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<command>nix-env</command>, <command>nix-instantiate</command> or
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<command>nix-build</command> evaluates to a function whose arguments
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all have default values, the function will be called automatically.
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Also, the new command-line switch <option>--arg
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<replaceable>name</replaceable>
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<replaceable>value</replaceable></option> can be used to specify
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function arguments on the command line.</para></listitem>
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<listitem><para>TODO: proxy support.</para></listitem>
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<listitem><para>TODO: nix-pack-closure and
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nix-unpack-closure.</para></listitem>
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<listitem><para>New commands <command>nix-pack-closure</command> and
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<command>nix-unpack-closure</command> than can be used to easily
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transfer a stire path with all its dependencies to another machine.
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Very convenient whenever you have some package on your machine and
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you want to copy it somewhere else.</para></listitem>
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<listitem><para><command>bsdiff</command> updated
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4.3.</para></listitem>
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<listitem><para>TODO: open files etc. are now used as roots of the
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garbage collector.</para></listitem>
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garbage collector (r5796).</para></listitem>
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<listitem><para>TODO: --attr / -a flags in
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nix-env/nix-instantiate/nix-build.</para></listitem>
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<listitem><para>TODO: --attr / -A flags in
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nix-env/nix-instantiate/nix-build. Also nix-env -qa
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--attr.</para></listitem>
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<listitem><para><literal>nix-build -o
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<replaceable>symlink</replaceable></literal> allows the symlink to
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the build result to be named something other than
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<literal>result</literal>.</para></listitem>
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<listitem><para><literal>nix-store --gc</literal>
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(a.k.a. <command>nix-collect-garbage</command>) prints out the
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number of bytes freed on standard output. <literal>nix-store --gc
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--print-dead</literal> shows how many bytes would be freed by an
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actual garbage collection.</para></listitem>
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<listitem><para>New command <literal>nix-store --delete</literal> to
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delete specific paths from the Nix store. It won’t delete reachable
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(non-garbage) paths unless <option>--ignore-liveness</option> is
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specified.</para></listitem>
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<listitem><para>Substantial performance improvements in expression
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evaluation and <literal>nix-env -qa</literal>, all thanks to <link
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xlink:href="http://valgrind.org/">Valgrind</link>. Memory use has
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been reduced by a factor 8 or so. Big speedup by memoisation of
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path hashing.</para></listitem>
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<listitem><para>Lots of bug fixes, notably:
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<itemizedlist>
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<listitem><para>Make sure that the garbage collector can run
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succesfully when the disk is full.</para></listitem>
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</itemizedlist>
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</para></listitem>
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<listitem><para>TODO: XML support in <literal>nix-env -q
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--xml</literal> and <literal>nix-instantiate --eval-only
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--xml</literal>.</para></listitem>
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<listitem><para><literal>nix-env -i
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<replaceable>pkgname</replaceable></literal> will now install the
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highest available version of <replaceable>pkgname</replaceable>,
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rather than installing all available versions (which would probably
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give collisions).</para></listitem>
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<listitem><para><literal>nix-env (-i|-u) --dry-run</literal> now
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shows exactly which missing paths will be built or
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substituted.</para></listitem>
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<listitem><para><literal>nix-env -qa --description</literal> shows
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human-readable descriptions of packages, provided that they have a
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<literal>meta.description</literal> attribute (which most packages
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in Nixpkgs don’t have yet).</para></listitem>
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<listitem><para>Nix source distributions are a lot smaller now since
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we no longer include a full copy of the Berkeley DB source
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distribution (but only the bits we need).</para></listitem>
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<listitem><para>Support for 64-bit platforms, provided <link
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xlink:href="http://bugzilla.sen.cwi.nl:8080/show_bug.cgi?id=606">suitably
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patched ATerm library</link> is used.</para></listitem>
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<listitem><para>Added support for Cygwin (Windows,
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<literal>i686-cygwin</literal>) and Mac OS X on Intel
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(<literal>i686-darwin</literal>).</para></listitem>
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<listitem><para><command>nix-env</command> now locks the profile to
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prevent races between concurrent <command>nix-env</command>
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operations on the same profile
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(<literal>NIX-7</literal>).</para></listitem>
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<listitem><para>TODO: <literal>nix-push
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--target</literal>.</para></listitem>
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</itemizedlist>
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