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  <h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Web Updater</a><ul>
<li><a class="reference internal" href="#server-requirements">Server Requirements</a></li>
<li><a class="reference internal" href="#building-an-update">Building an Update</a></li>
<li><a class="reference internal" href="#functions">Functions</a></li>
<li><a class="reference internal" href="#screen">Screen</a></li>
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  <div class="section" id="web-updater">
<h1>Web Updater<a class="headerlink" href="#web-updater" title="Permalink to this headline"></a></h1>
<p>Ren'Py includes an updater that can automatically download and install
updates to a Ren'Py game hosted at a website. This can be useful in
keeping a large game up to date.</p>
<p>The Ren'Py updater works by automatically performing the following
steps:</p>
<ol class="arabic simple">
<li>Downloading an index file that controls what is updated.</li>
<li>Asking the user if he or she wants to proceed with the update.</li>
<li>Producing an archive file from the files on disk.</li>
<li>Downloading a zsync control file from the server.</li>
<li>Using the zsync tool to update the archive file to the version on
the server. Zsync automatically computes the differences between
the two files, and attempts to only download the portions that
have changed.</li>
<li>Unpacking the archive, replacing the files on disk.</li>
<li>Deleting files that have been removed between the old and new
versions.</li>
<li>Restarting the game.</li>
</ol>
<p>The Ren'Py updater shows an updater screen during this process,
prompting the user to proceed and allowing the user to cancel
when appropriate.</p>
<div class="section" id="server-requirements">
<h2>Server Requirements<a class="headerlink" href="#server-requirements" title="Permalink to this headline"></a></h2>
<p>The updater requires that you provide your own hosting. You should be
able to download the update files by going to the appropriate URL
directly, and your server must support HTTP range queries.</p>
<p>(This means paying for web hosting, as &quot;sharing&quot; sites tend not to
support the required features.)</p>
</div>
<div class="section" id="building-an-update">
<h2>Building an Update<a class="headerlink" href="#building-an-update" title="Permalink to this headline"></a></h2>
<p>Updates are built automatically when distributions are built. To build
an update, set build.include_update to True in options.rpy. This will
unlock the &quot;Build Updates&quot; option in the &quot;Build Distributions&quot; section
of the launcher. Check this option, and Ren'Py will create the update
files.</p>
<p>The update files consist of:</p>
<dl class="docutils">
<dt>updates.json</dt>
<dd>An index of available updates and their versions.</dd>
<dt><em>package</em>.sums</dt>
<dd>Contains checksums for each block in the package.</dd>
<dt><em>package</em>.update.gz</dt>
<dd>Contains the update data for the given package.</dd>
<dt><em>package</em>.update.json</dt>
<dd>Contains a list of the files in each package, which the updater
uses when downloading DLC.</dd>
<dt><em>package</em>.zsync</dt>
<dd>This is a control file that's used by zsync to manage the download.</dd>
</dl>
<p>You must upload all these files to a single directory on your web
server.</p>
</div>
<div class="section" id="functions">
<h2>Functions<a class="headerlink" href="#functions" title="Permalink to this headline"></a></h2>
<p>To cause an update to occur, invoke either updater.update or the
updater.Update action.</p>
<dl class="function">
<dt id="updater.Update">
<tt class="descclassname">updater.</tt><tt class="descname">Update</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#updater.Update" title="Permalink to this definition"></a></dt>
<dd><p>An action that calls <a class="reference internal" href="#updater.update" title="updater.update"><tt class="xref py py-func docutils literal"><span class="pre">updater.update()</span></tt></a>. All arguments are
stored and passed to that function.</p>
</dd></dl>

<dl class="function">
<dt id="updater.can_update">
<tt class="descclassname">updater.</tt><tt class="descname">can_update</tt><big>(</big><em>base=None</em><big>)</big><a class="headerlink" href="#updater.can_update" title="Permalink to this definition"></a></dt>
<dd><p>Returns true if it's possible that an update can succeed. Returns false
if updating is totally impossible. (For example, if the update directory
was deleted.)</p>
</dd></dl>

<dl class="function">
<dt id="updater.get_installed_packages">
<tt class="descclassname">updater.</tt><tt class="descname">get_installed_packages</tt><big>(</big><em>base=None</em><big>)</big><a class="headerlink" href="#updater.get_installed_packages" title="Permalink to this definition"></a></dt>
<dd><p>Returns a list of installed DLC package names.</p>
<dl class="docutils">
<dt><cite>base</cite></dt>
<dd>The base directory to update. Defaults to the current project's
base directory.</dd>
</dl>
</dd></dl>

<dl class="function">
<dt id="updater.update">
<tt class="descclassname">updater.</tt><tt class="descname">update</tt><big>(</big><em>url</em>, <em>base=None</em>, <em>force=False</em>, <em>public_key=None</em>, <em>simulate=None</em>, <em>add=</em><span class="optional">[</span><span class="optional">]</span>, <em>restart=True</em><big>)</big><a class="headerlink" href="#updater.update" title="Permalink to this definition"></a></dt>
<dd><p>Updates this Ren'Py game to the latest version.</p>
<dl class="docutils">
<dt><cite>url</cite></dt>
<dd>The URL to the updates.json file.</dd>
<dt><cite>base</cite></dt>
<dd>The base directory that will be updated. Defaults to the base
of the current game. (This can usually be ignored.)</dd>
<dt><cite>force</cite></dt>
<dd>Force the update to occur even if the version numbers are
the same. (Used for testing.)</dd>
<dt><cite>public_key</cite></dt>
<dd>The path to a PEM file containing a public key that the
update signature is checked against. (This can usually be ignored.)</dd>
<dt><cite>simulate</cite></dt>
<dd><p class="first">This is used to test update guis without actually performing
an update. This can be:</p>
<ul class="last simple">
<li>None to perform an update.</li>
<li>&quot;available&quot; to test the case where an update is available.</li>
<li>&quot;not_available&quot; to test the case where no update is available.</li>
<li>&quot;error&quot; to test an update error.</li>
</ul>
</dd>
<dt><cite>add</cite></dt>
<dd>A list of packages to add during this update. This is only necessary
for dlc.</dd>
<dt><cite>restart</cite></dt>
<dd>Restart the game after the update.</dd>
</dl>
</dd></dl>

</div>
<div class="section" id="screen">
<h2>Screen<a class="headerlink" href="#screen" title="Permalink to this headline"></a></h2>
<p>To customize the look of the updater, you may override the <tt class="docutils literal"><span class="pre">updater</span></tt>
screen. The default screen is defined in common/00updater.rpy.</p>
</div>
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