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8 <title>GLEP 22 -- New "keyword" system to incorporate various userlands/kernels/archs</title>
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27 <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">22</td>
28 </tr>
29 <tr class="field"><th class="field-name">Title:</th><td class="field-body">New &quot;keyword&quot; system to incorporate various userlands/kernels/archs</td>
30 </tr>
31 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.8</td>
32 </tr>
33 <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.cgi/xml/htdocs/proj/en/glep/glep-0022.txt?cvsroot=gentoo">2005/01/09 16:12:40</a></td>
34 </tr>
35 <tr class="field"><th class="field-name">Author:</th><td class="field-body">Grant Goodyear &lt;g2boojum&#32;&#97;t&#32;gentoo.org&gt;</td>
36 </tr>
37 <tr class="field"><th class="field-name">Status:</th><td class="field-body">Final</td>
38 </tr>
39 <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
40 </tr>
41 <tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="glep-0002.html">text/x-rst</a></td>
42 </tr>
43 <tr class="field"><th class="field-name">Created:</th><td class="field-body">6-Mar-2004</td>
44 </tr>
45 <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">6-Mar-2004, 5-Jun-2004, 20-Jul-2004</td>
46 </tr>
47 </tbody>
48 </table>
49 <hr />
50 <div class="contents topic">
51 <p class="topic-title first"><a id="contents" name="contents">Contents</a></p>
52 <ul class="simple">
53 <li><a class="reference" href="#status" id="id14" name="id14">Status</a></li>
54 <li><a class="reference" href="#credits" id="id15" name="id15">Credits</a></li>
55 <li><a class="reference" href="#abstract" id="id16" name="id16">Abstract</a></li>
56 <li><a class="reference" href="#motivation" id="id17" name="id17">Motivation</a></li>
57 <li><a class="reference" href="#specification" id="id18" name="id18">Specification</a><ul>
58 <li><a class="reference" href="#keyword-fragments" id="id19" name="id19">Keyword Fragments</a></li>
59 <li><a class="reference" href="#reasonable-defaults" id="id20" name="id20">Reasonable Defaults</a></li>
60 <li><a class="reference" href="#ebuild-keyword-database" id="id21" name="id21">Ebuild Keyword Database?</a></li>
61 <li><a class="reference" href="#profiles" id="id22" name="id22">Profiles</a></li>
62 </ul>
63 </li>
64 <li><a class="reference" href="#rationale" id="id23" name="id23">Rationale</a></li>
65 <li><a class="reference" href="#implementation" id="id24" name="id24">Implementation</a></li>
66 <li><a class="reference" href="#backwards-compatibility" id="id25" name="id25">Backwards Compatibility</a></li>
67 <li><a class="reference" href="#id1" id="id26" name="id26">References</a></li>
68 <li><a class="reference" href="#copyright" id="id27" name="id27">Copyright</a></li>
69 </ul>
70 </div>
71 <div class="section">
72 <h1><a class="toc-backref" href="#id14" id="status" name="status">Status</a></h1>
73 <p>After withdrawing this GLEP temporarily, a rewritten version has
74 now been resubmitted. This version no longer tries to prevent a
75 keyword explosion, but merely tries to make it manageable.</p>
76 <p>This version was approved on 14-Jun-2004, with the amendment that cascading
77 profiles should be used.</p>
78 </div>
79 <div class="section">
80 <h1><a class="toc-backref" href="#id15" id="credits" name="credits">Credits</a></h1>
81 <p>This GLEP originated from the concerns that Daniel Robbins had with the
82 <em>x86obsd</em> keyword, and his desire to make the KEYWORDS variable more
83 &quot;feature-rich&quot;. Drobbins' original idea was that we should allow compound
84 keywords such as gnu/x86, gnu/ppc, and macos/ppc (which would be explicit
85 versions of the more familiar x86, ppc, and macos keywords). Method noted
86 that userland/arch failed to capture the full range of possibilities (what
87 about a GNU userland on a BSD kernel+libc?), and the issue has languished due
88 to a lack of reasonable solutions. The original version of this GLEP
89 generated quite useful comments which hopefully have been addressed here to
90 make the GLEP much more reasonable.</p>
91 </div>
92 <div class="section">
93 <h1><a class="toc-backref" href="#id16" id="abstract" name="abstract">Abstract</a></h1>
94 <p>As Gentoo branches out to support non-Linux and non-GNU systems (such as Hurd,
95 the *BSDs, or even the soon-to-be-open-sourced Solaris), the potential for an
96 &quot;explosion&quot; of possible keywords becomes rather large, since each new
97 userland/kernel/arch/whatever combination will require a new keyword. This
98 GLEP proposes a simple extension to the current KEYWORDS variable that
99 encompasses the four parameters ARCH, USERLAND, KERNEL, and LIBC, but uses
100 sensible defaults to keep the new system manageable.</p>
101 </div>
102 <div class="section">
103 <h1><a class="toc-backref" href="#id17" id="motivation" name="motivation">Motivation</a></h1>
104 <p>Since the beginning, Gentoo Linux has been conceived as a &quot;metadistribution&quot;
105 that combines remarkable flexibility with sensible defaults and exceptional
106 maintainablilty. The goal of the <a class="reference" href="http://www.gentoo.org/proj/en/gentoo-alt/index.xml">Gentoo-Alt</a> <a class="footnote-reference" href="#id2" id="id3" name="id3">[1]</a> project has been to extend that
107 flexibility to include systems other than GNU/Linux. For example, the author
108 of this GLEP has been working to create a <a class="reference" href="http://www.gentoo.org/proj/en/gentoo-alt/bsd/index.xml">version</a> <a class="footnote-reference" href="#id8" id="id9" name="id9">[3]</a> of Gentoo that uses
109 <a class="reference" href="http://www.openbsd.com">OpenBSD</a> <a class="footnote-reference" href="#id5" id="id6" name="id6">[2]</a> as the underlying kernel, userland, and libc. <a class="reference" href="http://www.openbsd.com">OpenBSD</a> <a class="footnote-reference" href="#id5" id="id7" name="id7">[2]</a> supports a
110 variety of different architectures, so, in principle, we would need a new
111 <em>openbsd-arch</em> keyword for each supported architecture. In fact, the
112 situation is even more complicated, because the <a class="reference" href="http://www.gentoo.org/proj/en/gentoo-alt/index.xml">Gentoo-Alt</a> <a class="footnote-reference" href="#id2" id="id4" name="id4">[1]</a> project would
113 eventually like to support the option of &quot;mixing-and-matching&quot;
114 GNU/*BSD/whatever userlands and libcs irrespective of the underlying kernel.
115 (<a class="reference" href="http://www.debian.org">Debian</a> <a class="footnote-reference" href="#id10" id="id11" name="id11">[4]</a>, for example has a similar BSD <a class="reference" href="http://www.debian.org/ports/netbsd/">project</a> <a class="footnote-reference" href="#id12" id="id13" name="id13">[5]</a>, except that they have
116 replaced the BSD userland with a GNU userland.) The net result is that we
117 need keywords that can specify all possible permutations of arch,
118 userland, kernel and libc. A systematic nomenclature is needed.
119 Fortunately, the author is a Chemist. <em>Grin</em></p>
120 </div>
121 <div class="section">
122 <h1><a class="toc-backref" href="#id18" id="specification" name="specification">Specification</a></h1>
123 <div class="section">
124 <h2><a class="toc-backref" href="#id19" id="keyword-fragments" name="keyword-fragments">Keyword Fragments</a></h2>
125 <p>Each keyword needs to specify, either explicitly or
126 implicitly, the following parameters: ARCH, USERLAND, LIBC, and KERNEL.</p>
127 <blockquote>
128 <dl class="docutils">
129 <dt>ARCH:</dt>
130 <dd>x86, amd64, cobalt, mips64, arm, hppa, ia64, ppc64, sparc</dd>
131 <dt>KERNEL:</dt>
132 <dd>linux, selinux, openbsd, freebsd, netbsd, macosx</dd>
133 <dt>USERLAND:</dt>
134 <dd>gnu, bsd</dd>
135 <dt>LIBC:</dt>
136 <dd>glibc, openbsd, freebsd, netbsd, macosx</dd>
137 </dl>
138 </blockquote>
139 <p>(The above examples are not meant to be complete. Hurd, for example
140 is not included because I know very little about Hurd.)</p>
141 <p>A fully-specified keyword would look like
142 &quot;ARCH-KERNEL-USERLAND-LIBC&quot;, so, for example,
143 &quot;ppc-fbsd-gnu-glibc&quot; would indicate a Gentoo system corresponding to
144 a ppc architecture running the FreeBSD kernel with a GNU userland and glibc
145 as the system C library.</p>
146 </div>
147 <div class="section">
148 <h2><a class="toc-backref" href="#id20" id="reasonable-defaults" name="reasonable-defaults">Reasonable Defaults</a></h2>
149 <p>To keep this system manageable (and both to reduce typing and maintain
150 backwards compatibility), we need sensible defaults. For backwards
151 compatibility, the Gentoo default is a Linux kernel with a GNU userland
152 and glibc C library. Thus, the current crop of ARCH-based keywords
153 (x86, ppc, etcetera) require no change whatsoever. For the *BSD-based
154 systems the default USERLAND and LIBC would be those normally associated
155 with the corresponding KERNEL, so &quot;x86-obsd&quot; describes an x86 system
156 with an OpenBSD kernel, a BSD userland, and the OpenBSD C library. If
157 either USERLAND or LIBC is specified, and thus not the default, then the
158 entire four-parameter string must be used.</p>
159 </div>
160 <div class="section">
161 <h2><a class="toc-backref" href="#id21" id="ebuild-keyword-database" name="ebuild-keyword-database">Ebuild Keyword Database?</a></h2>
162 <p>One issue that has been raised is that adding a large number of keywords
163 to ebuilds is likely to become cumbersome over the long run. (One could
164 imagine that for a simple <cite>econf &amp;&amp; emake &amp;&amp; einstall</cite> ebuild that the
165 list of keywords could grow to be the lengthiest part of the ebuild.)
166 Instead, perhaps it would make more sense to move each ebuild's keywords
167 out of the ebuild proper into a separate, perhaps online, database.
168 Nothing in this GLEP would be incompatible with such an approach, so
169 any further discussion will be deferred to a possible future GLEP on
170 that topic.</p>
171 </div>
172 <div class="section">
173 <h2><a class="toc-backref" href="#id22" id="profiles" name="profiles">Profiles</a></h2>
174 <p>Along with an explosion of keywords comes a concomitant explosion of potential
175 profiles. Just as in the current system, the profile name would be
176 &quot;FLAVOR-KEYWORD-VERSION&quot; (such as &quot;default-s390-2004.1&quot;). One drawback
177 to having a large number of profiles is that maintainance becomes a
178 significant problem. In fact, one could reasonably argue that the current
179 number of profiles is already too many to be easily maintained. One proposal
180 that has been raised to simplify matters is the idea of stackable, or
181 cascading, profiles, so that only differences between profiles would have to
182 be maintained.</p>
183 </div>
184 </div>
185 <div class="section">
186 <h1><a class="toc-backref" href="#id23" id="rationale" name="rationale">Rationale</a></h1>
187 <p>The proposed new &quot;keywording&quot; system is far from elegant, which is
188 a substantial drawback. On the other hand, it is simple, it requires
189 relatively minor changes, and the changes can be implemented
190 gradually over time.</p>
191 </div>
192 <div class="section">
193 <h1><a class="toc-backref" href="#id24" id="implementation" name="implementation">Implementation</a></h1>
194 <p>Since the new keyword system is backwards-compatible with the current
195 system, &quot;implementation&quot; just means adding new keywords to ebuilds
196 as new systems are supported.</p>
197 </div>
198 <div class="section">
199 <h1><a class="toc-backref" href="#id25" id="backwards-compatibility" name="backwards-compatibility">Backwards Compatibility</a></h1>
200 <p>Backwards compatibility has already been addressed in some detail,
201 with the stated goal being a system that would leave all current
202 ebuilds working exactly as they are now.</p>
203 </div>
204 <div class="section">
205 <h1><a class="toc-backref" href="#id26" id="id1" name="id1">References</a></h1>
206 <table class="docutils footnote" frame="void" id="id2" rules="none">
207 <colgroup><col class="label" /><col /></colgroup>
208 <tbody valign="top">
209 <tr><td class="label"><a name="id2">[1]</a></td><td><em>(<a class="fn-backref" href="#id3">1</a>, <a class="fn-backref" href="#id4">2</a>)</em> <a class="reference" href="http://www.gentoo.org/proj/en/gentoo-alt/index.xml">http://www.gentoo.org/proj/en/gentoo-alt/index.xml</a></td></tr>
210 </tbody>
211 </table>
212 <table class="docutils footnote" frame="void" id="id5" rules="none">
213 <colgroup><col class="label" /><col /></colgroup>
214 <tbody valign="top">
215 <tr><td class="label"><a name="id5">[2]</a></td><td><em>(<a class="fn-backref" href="#id6">1</a>, <a class="fn-backref" href="#id7">2</a>)</em> <a class="reference" href="http://www.openbsd.com">http://www.openbsd.com</a></td></tr>
216 </tbody>
217 </table>
218 <table class="docutils footnote" frame="void" id="id8" rules="none">
219 <colgroup><col class="label" /><col /></colgroup>
220 <tbody valign="top">
221 <tr><td class="label"><a class="fn-backref" href="#id9" name="id8">[3]</a></td><td><a class="reference" href="http://www.gentoo.org/proj/en/gentoo-alt/bsd/index.xml">http://www.gentoo.org/proj/en/gentoo-alt/bsd/index.xml</a></td></tr>
222 </tbody>
223 </table>
224 <table class="docutils footnote" frame="void" id="id10" rules="none">
225 <colgroup><col class="label" /><col /></colgroup>
226 <tbody valign="top">
227 <tr><td class="label"><a class="fn-backref" href="#id11" name="id10">[4]</a></td><td><a class="reference" href="http://www.debian.org">http://www.debian.org</a></td></tr>
228 </tbody>
229 </table>
230 <table class="docutils footnote" frame="void" id="id12" rules="none">
231 <colgroup><col class="label" /><col /></colgroup>
232 <tbody valign="top">
233 <tr><td class="label"><a class="fn-backref" href="#id13" name="id12">[5]</a></td><td><a class="reference" href="http://www.debian.org/ports/netbsd/">http://www.debian.org/ports/netbsd/</a></td></tr>
234 </tbody>
235 </table>
236 </div>
237 <div class="section">
238 <h1><a class="toc-backref" href="#id27" id="copyright" name="copyright">Copyright</a></h1>
239 <p>This document has been placed in the public domain.</p>
240 </div>
241
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