<section xml:id="ssec-relnotes-1.5.3"><title>Release 1.5.3 (June 17, 2013)</title>

<para>This is primarily a bug fix release. The following changes are

noteworthy:</para>

<itemizedlist>

<listitem>

<para>Yet another security bug involving hard links to files

outside the store was fixed. This bug only affected multi-user

installations that do not have hard link restrictions

enabled. (NixOS is thus not vulnerable.)</para>

</listitem>

<listitem>

<para>The default binary cache URL has changed from

<uri>http://nixos.org/binary-cache</uri> to

<uri>http://cache.nixos.org</uri>. The latter is hosted on Amazon

CloudFront (courtesy of <link

xlink:href="http://www.logicblox.com/">LogicBlox</link>) and

should provide better performance for users in both Europe and

North America.</para>

</listitem>

<listitem>

<para>The binary cache substituter now prints a warning message if

fetching information from the cache takes more than five seconds.

Thus network or server problems no longer make Nix appear to just

hang.</para>

</listitem>

<listitem>

<para>Stack traces now show function names, e.g.

<screen>

while evaluating `concatMapStrings' at `<replaceable>...</replaceable>/nixpkgs/pkgs/lib/strings.nix:18:25':

</screen>

Also, if a function is called with an unexpected argument, Nix

now shows the name of the argument.

</para>

</listitem>

</itemizedlist>

</section>