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diff --git a/other-metadata.html b/other-metadata.html new file mode 100644 index 0000000..911a78c --- /dev/null +++ b/other-metadata.html @@ -0,0 +1,158 @@ + +<!DOCTYPE html> + +<html xmlns="http://www.w3.org/1999/xhtml"> + <head> + <meta charset="utf-8" /> + <title>Other metadata variables — Gentoo Policy Guide documentation</title> + <link rel="stylesheet" href="_static/alabaster.css" type="text/css" /> + <link rel="stylesheet" href="_static/pygments.css" type="text/css" /> + <script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script> + <script type="text/javascript" src="_static/jquery.js"></script> + <script type="text/javascript" src="_static/underscore.js"></script> + <script type="text/javascript" src="_static/doctools.js"></script> + <script type="text/javascript" src="_static/language_data.js"></script> + <link rel="index" title="Index" href="genindex.html" /> + <link rel="search" title="Search" href="search.html" /> + <link rel="next" title="USE flags" href="use-flags.html" /> + <link rel="prev" title="Language-specific policies" href="languages.html" /> + + <link rel="stylesheet" href="_static/custom.css" type="text/css" /> + + + <meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9" /> + + </head><body> + + + <div class="document"> + <div class="documentwrapper"> + <div class="bodywrapper"> + + + <div class="body" role="main"> + + <div class="section" id="other-metadata-variables"> +<h1>Other metadata variables<a class="headerlink" href="#other-metadata-variables" title="Permalink to this headline">¶</a></h1> +<span class="target" id="index-0"></span><div class="section" id="dynamic-slots-multislot-flag"> +<span id="index-1"></span><h2>Dynamic slots (multislot flag)<a class="headerlink" href="#dynamic-slots-multislot-flag" title="Permalink to this headline">¶</a></h2> +<dl class="field-list simple"> +<dt class="field-odd">Source</dt> +<dd class="field-odd"><p>QA (inferred from PMS)</p> +</dd> +<dt class="field-even">Reference</dt> +<dd class="field-even"><p><a class="reference external" href="https://wiki.gentoo.org/index.php?title=Project:Quality_Assurance/Policies&oldid=109991#multislot.2FUSE-dependent_SLOT">https://wiki.gentoo.org/index.php?title=Project:Quality_Assurance/Policies&oldid=109991#multislot.2FUSE-dependent_SLOT</a></p> +</dd> +<dt class="field-odd">Reported</dt> +<dd class="field-odd"><p><code class="docutils literal notranslate"><span class="pre">use</span></code> in global scope triggers fatal error</p> +</dd> +</dl> +<p>The use of <code class="docutils literal notranslate"><span class="pre">multislot</span></code> to alter <code class="docutils literal notranslate"><span class="pre">SLOT</span></code> values (as well as any other +USE-dependent slot values) in the Gentoo repository is forbidden. +Such a feature can be used in overlays, and it is acceptable to provide +such support in eclasses as long as it is not used in ::gentoo.</p> +<p>This policy has been explicitly declared in response to historical +(pre-2016) use of <code class="docutils literal notranslate"><span class="pre">USE=multislot</span></code> in toolchain ebuilds. When the flag +was disabled, all package versions used the same slot, and upgrades were +handled as for non-slotted packages. When the flag was enabled, each +version used a separate slot, permitting multiple versions being +installed simultaneously. This allowed the user to choose between +the two options.</p> +<p>The original violation has been resolved by unconditionally slotting +the packages. This permitted the users to install multiple versions +in parallel, while removal of old versions was to be handled via +<code class="docutils literal notranslate"><span class="pre">emerge</span> <span class="pre">--depclean</span></code>.</p> +<p><em>Rationale</em>: this feature was in direct violation of PMS <a class="reference external" href="https://projects.gentoo.org/pms/7/pms.html#x1-600007.1">metadata +invariance</a> requirements. It caused the cached slot value to depend +on the state of querying the USE flag (which in turn could technically +depend on slot, via <code class="docutils literal notranslate"><span class="pre">package.use</span></code>). This caused undefined package +manager behavior which could include use of unpredictable slot, cache +invalidation or explicit errors.</p> +</div> +</div> + + + </div> + + </div> + </div> + <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> + <div class="sphinxsidebarwrapper"> +<h1 class="logo"><a href="index.html">Gentoo Policy Guide</a></h1> + + + + + + + + +<h3>Navigation</h3> +<p class="caption"><span class="caption-text">Contents:</span></p> +<ul class="current"> +<li class="toctree-l1"><a class="reference internal" href="preface.html">Preface</a></li> +<li class="toctree-l1"><a class="reference internal" href="motivation.html">Motivation and history</a></li> +<li class="toctree-l1"><a class="reference internal" href="basics.html">Basic information</a></li> +<li class="toctree-l1"><a class="reference internal" href="other-docs.html">Other policy documents</a></li> +<li class="toctree-l1"><a class="reference internal" href="dependencies.html">Dependencies</a></li> +<li class="toctree-l1"><a class="reference internal" href="ebuild-format.html">Ebuild file format</a></li> +<li class="toctree-l1"><a class="reference internal" href="filesystem.html">File system layout</a></li> +<li class="toctree-l1"><a class="reference internal" href="installed-files.html">Installed files</a></li> +<li class="toctree-l1"><a class="reference internal" href="keywords.html">Keywording and stabilization</a></li> +<li class="toctree-l1"><a class="reference internal" href="languages.html">Language-specific policies</a></li> +<li class="toctree-l1 current"><a class="current reference internal" href="#">Other metadata variables</a><ul> +<li class="toctree-l2"><a class="reference internal" href="#dynamic-slots-multislot-flag">Dynamic slots (multislot flag)</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="use-flags.html">USE flags</a></li> +<li class="toctree-l1"><a class="reference internal" href="user-group.html">Users and groups</a></li> +</ul> + +<div class="relations"> +<h3>Related Topics</h3> +<ul> + <li><a href="index.html">Documentation overview</a><ul> + <li>Previous: <a href="languages.html" title="previous chapter">Language-specific policies</a></li> + <li>Next: <a href="use-flags.html" title="next chapter">USE flags</a></li> + </ul></li> +</ul> +</div> +<div id="searchbox" style="display: none" role="search"> + <h3 id="searchlabel">Quick search</h3> + <div class="searchformwrapper"> + <form class="search" action="search.html" method="get"> + <input type="text" name="q" aria-labelledby="searchlabel" /> + <input type="submit" value="Go" /> + </form> + </div> +</div> +<script type="text/javascript">$('#searchbox').show(0);</script> + + + + + + + + + </div> + </div> + <div class="clearer"></div> + </div> + <div class="footer"> + ©2020, Gentoo Authors. + + | + Powered by <a href="http://sphinx-doc.org/">Sphinx 2.3.1</a> + & <a href="https://github.com/bitprophet/alabaster">Alabaster 0.7.12</a> + + | + <a href="_sources/other-metadata.rst.txt" + rel="nofollow">Page source</a> + </div> + + + + + </body> +</html>
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