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<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 class="section" id="homepage-value-must-be-meaningful">
<span id="index-2"></span><h2>HOMEPAGE value must be meaningful<a class="headerlink" href="#homepage-value-must-be-meaningful" title="Permalink to this headline">¶</a></h2>
<dl class="field-list simple">
<dt class="field-odd">Source</dt>
<dd class="field-odd"><p>QA</p>
</dd>
<dt class="field-even">Reference</dt>
<dd class="field-even"><p><a class="reference external" href="https://archives.gentoo.org/gentoo-dev/message/83cc5bbd7bbe8bdf04dd3c3bc7f8a035">https://archives.gentoo.org/gentoo-dev/message/83cc5bbd7bbe8bdf04dd3c3bc7f8a035</a></p>
</dd>
<dt class="field-odd">Reported</dt>
<dd class="field-odd"><p>known bad values are reported by pkgcheck</p>
</dd>
</dl>
<p>The HOMEPAGE specified for the package should either be dedicated
to the package in question or make it easy to find dedicated
information. Packages must not use <code class="docutils literal notranslate"><span class="pre">https://www.gentoo.org/</span></code>
or a similar generic homepage. If no homepage is available, the special
value of <code class="docutils literal notranslate"><span class="pre">https://wiki.gentoo.org/wiki/No_homepage</span></code> must be used.</p>
<p><em>Rationale</em>: The homepage specified in ebuilds is normally used to
locate information about the upstream project, e.g. downloads, source
code repository, bug tracker, documentation. Homepages that make it
hard to locate information about a specific project have little value,
and the Gentoo homepage generally does not do a good job at linking even
major Gentoo projects. Furthermore, many of the projects did not even
have a single dedicated subpage anywhere in Gentoo web space. In all
those cases, using the explicit No_homepage marker at least makes it
easy to identify such packages.</p>
</div>
<div class="section" id="restrict-test-for-use-test">
<span id="index-3"></span><h2>RESTRICT=test for USE=-test<a class="headerlink" href="#restrict-test-for-use-test" title="Permalink to this headline">¶</a></h2>
<dl class="field-list simple">
<dt class="field-odd">Source</dt>
<dd class="field-odd"><p>QA</p>
</dd>
<dt class="field-even">Reported</dt>
<dd class="field-even"><p>by pkgcheck</p>
</dd>
</dl>
<p>Whenever the package uses <code class="docutils literal notranslate"><span class="pre">test</span></code> flag to control test prerequisites
(or another flag with a similar purpose), it must explicitly restrict
tests when the flag is unset.</p>
<p><em>Example</em>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">IUSE</span><span class="o">=</span><span class="s2">"test"</span>
<span class="n">RESTRICT</span><span class="o">=</span><span class="s2">"!test? ( test )"</span>
</pre></div>
</div>
<p><em>Rationale</em>: contrary to common assumption, <code class="docutils literal notranslate"><span class="pre">test</span></code> flag is not special
and the package manager can execute tests when the flag is disabled.
The explicit restriction guarantees that tests will be skipped under
this circumstance, and they will not fail for users.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Technically there are packages that do not strictly require this
restriction since they handle missing test prerequisites gracefully
(e.g. by skipping the tests). However, we enforce the rule for all
packages since omitting the restriction by mistake is much more
common, and there is little harm in overspecifying it.</p>
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<li class="toctree-l1"><a class="reference internal" href="maintainer.html">Package Maintainers</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Other metadata variables</a><ul class='nav'>
<li class="toctree-l2"><a class="reference internal" href="#dynamic-slots-multislot-flag">Dynamic slots (multislot flag)</a></li>
<li class="toctree-l2"><a class="reference internal" href="#homepage-value-must-be-meaningful">HOMEPAGE value must be meaningful</a></li>
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