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<li class="nav-item nav-item-this"><a href="">OS Format</a></li>
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<section id="os-format">
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<h1>OS Format<a class="headerlink" href="#os-format" title="Link to this heading">¶</a></h1>
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<section id="a-summary-of-os-formats-in-clear-linux">
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<h2>A summary of OS formats in Clear Linux<a class="headerlink" href="#a-summary-of-os-formats-in-clear-linux" title="Link to this heading">¶</a></h2>
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<dl class="field-list simple">
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<dt class="field-odd">Copyright<span class="colon">:</span></dt>
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<dd class="field-odd"><p>(C) 2018 Intel Corporation, CC-BY-SA-3.0</p>
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</dd>
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<dt class="field-even">Manual section<span class="colon">:</span></dt>
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<dd class="field-even"><p>7</p>
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</dd>
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</dl>
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<section id="synopsis">
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<h3>SYNOPSIS<a class="headerlink" href="#synopsis" title="Link to this heading">¶</a></h3>
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<p><code class="docutils literal notranslate"><span class="pre">/usr/share/defaults/swupd/format</span></code></p>
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</section>
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<section id="description">
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<h3>DESCRIPTION<a class="headerlink" href="#description" title="Link to this heading">¶</a></h3>
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<p>A format defines a range of OS versions that have compatible update metadata and
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content. An update client can update a system from the oldest version in the
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format to the latest version in the format without worrying about compatibility
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issues in the update content for the version it is updating to.</p>
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<p>A format bump occurs when the update metadata or content is changed in such a
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way that will cause client updates to break. In this case the format number must
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be incremented so clients will not attempt to update to the new versions in the
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new format without crossing the format boundary. Update clients update only to
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the latest build in their format. Once that update is complete the update client
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may then update forward again because the last version in the current format has
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identical content to the first version in the new format, including the new
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update client needed to understand the new format.</p>
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<p>Because the update system in Clear Linux (<code class="docutils literal notranslate"><span class="pre">swupd</span></code>) has auto-update turned on
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by default most users will never be aware of their system changing to a new
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format. Those users who have disabled auto-update may occasionally see <code class="docutils literal notranslate"><span class="pre">swupd</span></code>
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perform two updates in a row when they only invoked <code class="docutils literal notranslate"><span class="pre">swupd</span> <span class="pre">update</span></code> once. This
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is because <code class="docutils literal notranslate"><span class="pre">swupd</span></code> detects when it crossed a format boundary and immediately
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re-executes an update to carry it to the latest version in the new format. This
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re-execution will actually invoke the new version of <code class="docutils literal notranslate"><span class="pre">swupd</span></code> that was
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delivered in the first update.</p>
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<p>Format bumps are simply a way for Clear Linux to introduce breaking changes to
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the OS without breaking user’s update stream or workflow.</p>
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</section>
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<section id="see-also">
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<h3>SEE ALSO<a class="headerlink" href="#see-also" title="Link to this heading">¶</a></h3>
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<ul class="simple">
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<li><p><a class="reference external" href="mixer.1.html">mixer(1)</a></p></li>
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<li><p><a class="reference external" href="swupd.1.html">swupd(1)</a></p></li>
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<li><p><a class="reference external" href="https://clearlinux.org/documentation/">https://clearlinux.org/documentation/</a></p></li>
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<li><p><a class="reference external" href="https://github.com/clearlinux/swupd-client/">https://github.com/clearlinux/swupd-client/</a></p></li>
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<li><p><a class="reference external" href="https://github.com/clearlinux/mixer-tools/">https://github.com/clearlinux/mixer-tools/</a></p></li>
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</ul>
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<h3><a href="../../index.html">Table of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">OS Format</a><ul>
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<li><a class="reference internal" href="#a-summary-of-os-formats-in-clear-linux">A summary of OS formats in Clear Linux</a><ul>
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<li><a class="reference internal" href="#synopsis">SYNOPSIS</a></li>
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<li><a class="reference internal" href="#description">DESCRIPTION</a></li>
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