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12     <title>GLEP 29 -- USE flag groups</title>
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27     <div class="document">
28     <table class="rfc2822 field-list" frame="void" rules="none">
29     <col class="field-name" />
30     <col class="field-body" />
31     <tbody valign="top">
32     <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">29</td>
33     </tr>
34     <tr class="field"><th class="field-name">Title:</th><td class="field-body">USE flag groups</td>
35     </tr>
36 g2boojum 1.2 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.3</td>
37 g2boojum 1.1 </tr>
38     <tr class="field"><th class="field-name">Author:</th><td class="field-body">Ciaran McCreesh &lt;ciaranm&#32;&#97;t&#32;gentoo.org&gt;</td>
39     </tr>
40 g2boojum 1.2 <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference" href="http://www.gentoo.org/cgi-bin/viewcvs/xml/htdocs/proj/en/glep/glep-0029.txt?cvsroot=gentoo">2004/10/18 15:32:10</a></td>
41 g2boojum 1.1 </tr>
42     <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td>
43     </tr>
44     <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
45     </tr>
46     <tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="glep-0012.html">text/x-rst</a></td>
47     </tr>
48     <tr class="field"><th class="field-name">Created:</th><td class="field-body">19-August-2004</td>
49     </tr>
50 g2boojum 1.2 <tr class="field"><th class="field-name">Post-Date:</th><td class="field-body">21-August-2004, 18-October-2004</td>
51 g2boojum 1.1 </tr>
52     </tbody>
53     </table>
54     <hr />
55     <div class="contents topic" id="contents">
56     <p class="topic-title first"><a name="contents">Contents</a></p>
57     <ul class="simple">
58     <li><a class="reference" href="#abstract" id="id3" name="id3">Abstract</a></li>
59     <li><a class="reference" href="#motivation" id="id4" name="id4">Motivation</a></li>
60     <li><a class="reference" href="#specification" id="id5" name="id5">Specification</a><ul>
61     <li><a class="reference" href="#group-specification" id="id6" name="id6">Group Specification</a></li>
62     <li><a class="reference" href="#group-descriptions" id="id7" name="id7">Group Descriptions</a></li>
63     <li><a class="reference" href="#using-groups" id="id8" name="id8">Using Groups</a></li>
64     <li><a class="reference" href="#additional-issues" id="id9" name="id9">Additional Issues</a></li>
65     <li><a class="reference" href="#adding-new-groups" id="id10" name="id10">Adding New Groups</a></li>
66     </ul>
67     </li>
68     <li><a class="reference" href="#rationale" id="id11" name="id11">Rationale</a></li>
69     <li><a class="reference" href="#reference-implementation" id="id12" name="id12">Reference Implementation</a></li>
70     <li><a class="reference" href="#backwards-compatability" id="id13" name="id13">Backwards Compatability</a></li>
71     <li><a class="reference" href="#references" id="id14" name="id14">References</a></li>
72     <li><a class="reference" href="#copyright" id="id15" name="id15">Copyright</a></li>
73     </ul>
74     </div>
75     <div class="section" id="abstract">
76     <h1><a class="toc-backref" href="#id3" name="abstract">Abstract</a></h1>
77     <p>Currently, USE flags must be selected on a one-by-one basis, making it
78     time-consuming to set up make.conf appropriately for a machine's role.</p>
79     </div>
80     <div class="section" id="motivation">
81     <h1><a class="toc-backref" href="#id4" name="motivation">Motivation</a></h1>
82 g2boojum 1.2 <p>Many packages have optional support for other packages (for example, the
83     Vim text editor can optionally support perl, python and ruby
84     interpreters). In Gentoo, these optional dependencies can be selected by
85     the user using USE flags. This allows a system appropriate for a given
86     environment to be built -- a server, for example, should not typically
87     have an X11 server or sound support, whereas both would be desirable on
88     most desktop systems.</p>
89     <p>With several hundred USE flags available, deciding upon which USE flags to
90     enable and which to disable can take a long time. This GLEP proposes a
91     mechanism for grouping USE flags to simplify selection.</p>
92 g2boojum 1.1 </div>
93     <div class="section" id="specification">
94     <h1><a class="toc-backref" href="#id5" name="specification">Specification</a></h1>
95     <div class="section" id="group-specification">
96     <h2><a class="toc-backref" href="#id6" name="group-specification">Group Specification</a></h2>
97     <p>A group shall consist of one or more USE flags. These groups are defined
98     in <tt class="literal"><span class="pre">${PORTDIR}/profiles/use.groups</span></tt>. It is proposed that uppercase names
99     only are used for groups to keep them visually distinct from normal USE
100 g2boojum 1.2 flags, although this should not be enforced programatically. The file
101     should be similar in format to the existing use.* files. In the following,
102     <tt class="literal"><span class="pre">SOME_GROUP</span></tt> and <tt class="literal"><span class="pre">OTHER_GROUP</span></tt> are group names, and <tt class="literal"><span class="pre">flag1</span></tt> through
103     <tt class="literal"><span class="pre">flag5</span></tt> are USE flag names:</p>
104 g2boojum 1.1 <pre class="literal-block">
105     SOME_GROUP flag1 flag2 flag3
106     OTHER_GROUP flag2 flag4
107     </pre>
108     <p>Groups may recursively include other groups. For consistency with GLEP 23
109     [1], it is proposed that group names are prefixed with an 'at' symbol (&#64;):</p>
110     <pre class="literal-block">
111     GROUP1 flag1
112     GROUP2 flag2 flag3 &#64;GROUP1
113     GROUP3 flag4
114     GROUP4 &#64;GROUP2 &#64;GROUP3 flag5
115     </pre>
116 g2boojum 1.2 <p>The same flag may end up being in a particular group more than once:</p>
117     <pre class="literal-block">
118     GROUP1 flag1 flag2
119     GROUP2 flag2 flag3
120     GROUP3 &#64;GROUP1 &#64;GROUP2 flag3 flag4
121     </pre>
122     <p>As with similar files, comments may be included. Lines which begin with a
123     hash symbol (#) are comments.</p>
124     <pre class="literal-block">
125     # This is a comment
126     FOO bar baz fnord
127     </pre>
128 g2boojum 1.1 <p>Users may create their own groups using <tt class="literal"><span class="pre">/etc/portage/use.groups</span></tt>. This
129     file overrides the profile settings in the case of duplicates.</p>
130     </div>
131     <div class="section" id="group-descriptions">
132     <h2><a class="toc-backref" href="#id7" name="group-descriptions">Group Descriptions</a></h2>
133     <p>Groups shall have a textual description associated with them in the same
134     way as USE flags. The file <tt class="literal"><span class="pre">${PORTDIR}/profiles/use.groups.desc</span></tt>
135     contains these:</p>
136     <pre class="literal-block">
137 g2boojum 1.2 # This is a comment
138 g2boojum 1.1 DESKTOP Flags which are appropriate for most desktop systems
139     RECOMMENDED Flags which should be enabled on almost all systems
140     </pre>
141     </div>
142     <div class="section" id="using-groups">
143     <h2><a class="toc-backref" href="#id8" name="using-groups">Using Groups</a></h2>
144     <p>Groups may be used in <tt class="literal"><span class="pre">/etc/make.conf</span></tt>, <tt class="literal"><span class="pre">/etc/portage/package.use</span></tt> and
145     other places where USE flags are normally specified. Again, the &#64; symbol
146     is used. For example, a <tt class="literal"><span class="pre">make.conf</span></tt> for a desktop system might resemble:</p>
147     <pre class="literal-block">
148     USE=&quot;&#64;DESKTOP &#64;KDE perl alsa dvd&quot;
149     </pre>
150     </div>
151     <div class="section" id="additional-issues">
152     <h2><a class="toc-backref" href="#id9" name="additional-issues">Additional Issues</a></h2>
153     <p>Groups should <em>not</em> generally contain negative USE flags, as this would
154     lead to confusion. Groups are intended to specify what will be enabled for
155     a given role, not what will be turned off. For example, if the &#64;KDE group
156     disabled Gnome-related USE flags, and a user used <tt class="literal"><span class="pre">USE=&quot;&#64;GNOME</span> <span class="pre">&#64;KDE&quot;</span></tt> to
157     specify that they wanted both Gnome <em>and</em> KDE to be used where applicable,
158     chaos would ensue. However, for the sake of consistency, -flags should be
159     supported even if their use is strongly discouraged.</p>
160     <p>It is proposed that <tt class="literal"><span class="pre">-&#64;GROUP</span></tt> syntax should <em>not</em> be supported. Instead,
161     users wishing to turn most things off could use the <tt class="literal"><span class="pre">-*</span></tt> USE syntax
162 g2boojum 1.2 along with a group (for example, &#64;RECOMMENDED or &#64;MINIMAL) which turned on
163     flags (for example, pam and readline) which should usually be used.</p>
164 g2boojum 1.1 </div>
165     <div class="section" id="adding-new-groups">
166     <h2><a class="toc-backref" href="#id10" name="adding-new-groups">Adding New Groups</a></h2>
167     <p>The actual groups to be created is beyond the scope of this GLEP, and any
168     group names contained herein should be treated as examples only. Creation
169     of new groups and changing a group's flags should be discussed on the
170     gentoo-dev mailing list as per existing policy for new global USE flags.</p>
171     </div>
172     </div>
173     <div class="section" id="rationale">
174     <h1><a class="toc-backref" href="#id11" name="rationale">Rationale</a></h1>
175     <p>USE groups will simplify selecting an appropriate set of USE flags for a
176     system.</p>
177     </div>
178     <div class="section" id="reference-implementation">
179     <h1><a class="toc-backref" href="#id12" name="reference-implementation">Reference Implementation</a></h1>
180     <p>TODO</p>
181     </div>
182     <div class="section" id="backwards-compatability">
183     <h1><a class="toc-backref" href="#id13" name="backwards-compatability">Backwards Compatability</a></h1>
184     <p>The user will not need to make any changes to keep their current setup.
185     Users who are not running a portage version which supports groups can
186     carry on using current syntax with no side-effects.</p>
187     <p>Some tools which work with make.conf and / or USE flags (for example,
188     <tt class="literal"><span class="pre">ufed</span></tt>) will need to be updated to understand the new group syntax.</p>
189     <p>There is currently a dymanic list of USE flags available on the Gentoo
190     website [2]. For consistency, a similar list will be needed for USE
191     groups.</p>
192     </div>
193     <div class="section" id="references">
194     <h1><a class="toc-backref" href="#id14" name="references">References</a></h1>
195     <table class="footnote" frame="void" id="id1" rules="none">
196     <colgroup><col class="label" /><col /></colgroup>
197     <tbody valign="top">
198     <tr><td class="label"><a name="id1">[1]</a></td><td>GLEP 23: Portage handling of ACCEPT_LICENSE
199     (<a class="reference" href="http://www.gentoo.org/proj/en/glep/glep-0023.html">http://www.gentoo.org/proj/en/glep/glep-0023.html</a>)</td></tr>
200     </tbody>
201     </table>
202     <table class="footnote" frame="void" id="id2" rules="none">
203     <colgroup><col class="label" /><col /></colgroup>
204     <tbody valign="top">
205     <tr><td class="label"><a name="id2">[2]</a></td><td><a class="reference" href="http://www.gentoo.org/dyn/use-index.xml">http://www.gentoo.org/dyn/use-index.xml</a></td></tr>
206     </tbody>
207     </table>
208     </div>
209     <div class="section" id="copyright">
210     <h1><a class="toc-backref" href="#id15" name="copyright">Copyright</a></h1>
211     <p>This document has been placed in the public domain.</p>
212     <blockquote>
213     vim: set tw=74 :</blockquote>
214     </div>
215     </div>
216    
217     <hr class="footer" />
218     <div class="footer">
219     <a class="reference" href="glep-0029.txt">View document source</a>.
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