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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>Important Concepts</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="concepts"></a>Important Concepts</h2></div></div></div>
<div class="toc"><dl>
<dt><span class="sect1"><a href="concepts.html#introduction-ideas-packageid">Package ID</a></span></dt>
<dt><span class="sect1"><a href="introduction-ideas-filters.html">Filters</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="introduction-ideas-filters.html#introduction-ideas-filters-removeinstalled">Removing installed versions in search results</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-filters.html#introduction-ideas-filters-examples">Filter examples</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="introduction-errors.html">Error Enums</a></span></dt>
<dt><span class="sect1"><a href="introduction-group-type.html">Group type</a></span></dt>
<dt><span class="sect1"><a href="introduction-cancellation.html">Cancellation</a></span></dt>
<dt><span class="sect1"><a href="introduction-ideas-transactions.html">Transactions</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-success">Transaction example: Success</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-failure">Transaction example: Failure</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-trusted">Transaction example: Trusted</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-auto-untrusted">Transaction example: Auto Untrusted</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-sig-install">Transaction example: Package signature install</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-download">Transaction example: Download</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-set-locale">Transaction example: Setting the locale</a></span></dt>
<dt><span class="sect2"><a href="introduction-ideas-transactions.html#introduction-ideas-transactions-repair">Transaction example: Repair</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="introduction-ideas-transactionid.html">Transaction IDs</a></span></dt>
<dt><span class="sect1"><a href="introduction-ideas-status.html">Status Values</a></span></dt>
<dt><span class="sect1"><a href="introduction-ideas-simultaneous.html">Simultaneous Mode</a></span></dt>
</dl></div>
<p>
    The following sections explain key concepts used internally in PackageKit.
  </p>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="introduction-ideas-packageid"></a>Package ID</h2></div></div></div>
<p>
      One important idea is the <code class="literal">package_id</code>.
      This is the <code class="literal">name;version;arch;data</code> in
      a single string and is meant to represent a single package.
      This is important when multiple versions of a package are installed and
      only the correct one is removed.
    </p>
<p>
      The <code class="literal">package_id</code> is parsed and checked carefully in
      the helper code.
      The package arch and data is optional, but 3 <code class="literal">;</code>'s must
      be present.
      For instance, <code class="literal">gnome-keyring-manager;2.18.0;;</code> is
      valid but <code class="literal">gnome-keyring-manager;2.18.0</code> is not.
      The data field is used for the repository name.
    </p>
<p>
      The data field for an installed package must be
      <code class="literal">installed</code> as this is used to identify which packages
      are installable or installed in the client tools.
    </p>
<p>
      The data field for an non-installed local package must be
      <code class="literal">local</code> as this signifies a repository name is not available
      and that package resides locally on the client system.
    </p>
<p>
      For example:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
          <code class="literal">csup;20060318-5;x86_64;local</code>: for locally available package file.
        </p></li>
<li class="listitem"><p>
          <code class="literal">csup;20060318-5;x86_64;fedora-devel</code>: for package that is not installed
          and can be downladed from the Fedora development repostory.
        </p></li>
<li class="listitem"><p>
          <code class="literal">csup;20060318-5;x86_64;installed</code>: for locally installed package
        </p></li>
</ul></div>
<div class="informaltable"><table border="1">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Situation</th>
<th>Value</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td>Searching</td>
<td><code class="literal">installed</code></td>
<td>If installed</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">available</code></td>
<td>If available to install</td>
</tr>
<tr>
<td>Getting Updates</td>
<td><code class="literal">low</code></td>
<td>If update is of low severity</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">normal</code></td>
<td>If update is of normal severity</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">important</code></td>
<td>If update is very important</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">security</code></td>
<td>If the update is security sensitive</td>
</tr>
<tr>
<td>Installing/Updating/Removing</td>
<td><code class="literal">downloading</code></td>
<td>If we are downloading this package</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">updating</code></td>
<td>If we are updating this package</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">installing</code></td>
<td>If we are installing this package</td>
</tr>
<tr>
<td> </td>
<td><code class="literal">removing</code></td>
<td>If we are removing this package</td>
</tr>
<tr>
<td>Otherwise</td>
<td><code class="literal">unknown</code></td>
<td>If we cannot use any other option</td>
</tr>
</tbody>
</table></div>
<p>
      The backend must ensure that the package_id only matches on one
      single package.
      A single package_id must be enough to uniquely identify a single object
      in any repository used on the system.
    </p>
</div>
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