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* NEWS and manual update for release 0.7.

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Eelco Dolstra 2005-01-12 10:27:46 +00:00
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22
NEWS
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@ -1,3 +1,25 @@
Version 0.7
* 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 *sequence* of patches
to an installed component, Nix will use it. Patches are currently
generated automatically between Nixpkgs (pre-)releases.
* Simplifications to the substitute mechanism.
* Nix-pull now stores downloaded manifests in /nix/var/nix/manifests.
* 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.
Version 0.6
Major changes include the following:

9
doc/manual/introduction.xml
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@ -75,7 +75,7 @@ be adapted easily to achieve similar policies.</para></listitem>
<listitem><para>Nix component builds aim to be <quote>pure</quote>;
that is, unaffected by anything other than the declared dependencies.
This means that if a component was built succesfully once, it can be
This means that if a component was built successfully once, it can be
rebuilt again on another machine and the result will be the same. We
cannot <emphasis>guarantee</emphasis> this (e.g., if the build depends
on the time-of-day), but Nix (and the tools in the Nix Packages
@ -113,6 +113,13 @@ software deployment also apply here: for instance, the ability
trivially to have multiple configurations at the same time, or the
ability to do rollbacks.</para></listitem>
<listitem><para>Nix can efficiently upgrade between different versions
of a component through <emphasis>binary patching</emphasis>. If
patches are available on a server, and you try to install a new
version of some component, Nix will automatically apply a patch (or
sequence of patches), if available, to transform the installed
component into the new version.</para></listitem>
</itemizedlist>
</para>

11
doc/manual/writing-nix-expressions.xml
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@ -1253,6 +1253,17 @@ command-line argument. See <xref linkend='sec-standard-environment'
performed by looking for the hash parts of file names of the
inputs.</para></listitem>
<listitem><para>After the build, Nix sets the last-modified
timestamp on all files in the build result to 0 (00:00:00 1/1/1970
UTC), sets the group to the default group, and sets the mode of the
file to 0444 or 0555 (i.e., read-only, with execute permission
enabled if the file was originally executable). Note that possible
<literal>setuid</literal> and <literal>setgid</literal> bits are
cleared. Setuid and setgid programs are not currently supported by
Nix. This is because the Nix archives used in deployment have no
concept of ownership information, and because it makes the build
result dependent on the user performing the build.</para></listitem>
</itemizedlist>
</para>