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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="ch-relnotes-0.7">
<title>Release 0.7 (2005-01-12)</title>
<itemizedlist>
<listitem><para>Binary patching. When upgrading components using
pre-built binaries (through nix-pull / nix-channel), Nix can
automatically download and apply binary patches to already installed
components instead of full downloads. Patching is “smart”: if there
is a <emphasis>sequence</emphasis> of patches to an installed
component, Nix will use it. Patches are currently generated
automatically between Nixpkgs (pre-)releases.</para></listitem>
<listitem><para>Simplifications to the substitute
mechanism.</para></listitem>
<listitem><para>Nix-pull now stores downloaded manifests in
<filename>/nix/var/nix/manifests</filename>.</para></listitem>
<listitem><para>Metadata on files in the Nix store is canonicalised
after builds: the last-modified timestamp is set to 0 (00:00:00
1/1/1970), the mode is set to 0444 or 0555 (readable and possibly
executable by all; setuid/setgid bits are dropped), and the group is
set to the default. This ensures that the result of a build and an
installation through a substitute is the same; and that timestamp
dependencies are revealed.</para></listitem>
</itemizedlist>
</section>
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