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<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">22</td> |
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</tr> |
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<tr class="field"><th class="field-name">Title:</th><td class="field-body">New "keyword" system to incorporate various userlands/kernels/archs</td> |
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</tr> |
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<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.8</td> |
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</tr> |
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<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> |
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</tr> |
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<tr class="field"><th class="field-name">Author:</th><td class="field-body">Grant Goodyear <g2boojum at gentoo.org></td> |
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</tr> |
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<tr class="field"><th class="field-name">Status:</th><td class="field-body">Final</td> |
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</tr> |
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<tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td> |
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<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> |
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<tr class="field"><th class="field-name">Created:</th><td class="field-body">6-Mar-2004</td> |
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</tr> |
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<tr class="field"><th class="field-name">Post-History:</th><td class="field-body">6-Mar-2004, 5-Jun-2004, 20-Jul-2004</td> |
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</tr> |
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</tbody> |
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</table> |
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<hr /> |
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<div class="contents topic"> |
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<p class="topic-title first"><a id="contents" name="contents">Contents</a></p> |
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<ul class="simple"> |
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<li><a class="reference" href="#status" id="id14" name="id14">Status</a></li> |
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<li><a class="reference" href="#credits" id="id15" name="id15">Credits</a></li> |
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<li><a class="reference" href="#abstract" id="id16" name="id16">Abstract</a></li> |
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<li><a class="reference" href="#motivation" id="id17" name="id17">Motivation</a></li> |
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<li><a class="reference" href="#specification" id="id18" name="id18">Specification</a><ul> |
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<li><a class="reference" href="#keyword-fragments" id="id19" name="id19">Keyword Fragments</a></li> |
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<li><a class="reference" href="#reasonable-defaults" id="id20" name="id20">Reasonable Defaults</a></li> |
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<li><a class="reference" href="#ebuild-keyword-database" id="id21" name="id21">Ebuild Keyword Database?</a></li> |
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<li><a class="reference" href="#profiles" id="id22" name="id22">Profiles</a></li> |
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</ul> |
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</li> |
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<li><a class="reference" href="#rationale" id="id23" name="id23">Rationale</a></li> |
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<li><a class="reference" href="#implementation" id="id24" name="id24">Implementation</a></li> |
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<li><a class="reference" href="#backwards-compatibility" id="id25" name="id25">Backwards Compatibility</a></li> |
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<li><a class="reference" href="#id1" id="id26" name="id26">References</a></li> |
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<li><a class="reference" href="#copyright" id="id27" name="id27">Copyright</a></li> |
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</ul> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id14" id="status" name="status">Status</a></h1> |
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<p>After withdrawing this GLEP temporarily, a rewritten version has |
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now been resubmitted. This version no longer tries to prevent a |
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keyword explosion, but merely tries to make it manageable.</p> |
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<p>This version was approved on 14-Jun-2004, with the amendment that cascading |
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profiles should be used.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id15" id="credits" name="credits">Credits</a></h1> |
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<p>This GLEP originated from the concerns that Daniel Robbins had with the |
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<em>x86obsd</em> keyword, and his desire to make the KEYWORDS variable more |
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"feature-rich". Drobbins' original idea was that we should allow compound |
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keywords such as gnu/x86, gnu/ppc, and macos/ppc (which would be explicit |
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versions of the more familiar x86, ppc, and macos keywords). Method noted |
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that userland/arch failed to capture the full range of possibilities (what |
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about a GNU userland on a BSD kernel+libc?), and the issue has languished due |
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to a lack of reasonable solutions. The original version of this GLEP |
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generated quite useful comments which hopefully have been addressed here to |
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make the GLEP much more reasonable.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id16" id="abstract" name="abstract">Abstract</a></h1> |
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<p>As Gentoo branches out to support non-Linux and non-GNU systems (such as Hurd, |
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the *BSDs, or even the soon-to-be-open-sourced Solaris), the potential for an |
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"explosion" of possible keywords becomes rather large, since each new |
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userland/kernel/arch/whatever combination will require a new keyword. This |
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GLEP proposes a simple extension to the current KEYWORDS variable that |
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encompasses the four parameters ARCH, USERLAND, KERNEL, and LIBC, but uses |
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sensible defaults to keep the new system manageable.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id17" id="motivation" name="motivation">Motivation</a></h1> |
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<p>Since the beginning, Gentoo Linux has been conceived as a "metadistribution" |
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that combines remarkable flexibility with sensible defaults and exceptional |
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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 |
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flexibility to include systems other than GNU/Linux. For example, the author |
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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 |
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<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 |
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variety of different architectures, so, in principle, we would need a new |
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<em>openbsd-arch</em> keyword for each supported architecture. In fact, the |
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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 |
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eventually like to support the option of "mixing-and-matching" |
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GNU/*BSD/whatever userlands and libcs irrespective of the underlying kernel. |
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(<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 |
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replaced the BSD userland with a GNU userland.) The net result is that we |
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need keywords that can specify all possible permutations of arch, |
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userland, kernel and libc. A systematic nomenclature is needed. |
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Fortunately, the author is a Chemist. <em>Grin</em></p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id18" id="specification" name="specification">Specification</a></h1> |
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<div class="section"> |
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<h2><a class="toc-backref" href="#id19" id="keyword-fragments" name="keyword-fragments">Keyword Fragments</a></h2> |
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<p>Each keyword needs to specify, either explicitly or |
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implicitly, the following parameters: ARCH, USERLAND, LIBC, and KERNEL.</p> |
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<blockquote> |
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<dl class="docutils"> |
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<dt>ARCH:</dt> |
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<dd>x86, amd64, cobalt, mips64, arm, hppa, ia64, ppc64, sparc</dd> |
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<dt>KERNEL:</dt> |
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<dd>linux, selinux, openbsd, freebsd, netbsd, macosx</dd> |
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<dt>USERLAND:</dt> |
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<dd>gnu, bsd</dd> |
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<dt>LIBC:</dt> |
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<dd>glibc, openbsd, freebsd, netbsd, macosx</dd> |
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</dl> |
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</blockquote> |
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<p>(The above examples are not meant to be complete. Hurd, for example |
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is not included because I know very little about Hurd.)</p> |
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<p>A fully-specified keyword would look like |
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"ARCH-KERNEL-USERLAND-LIBC", so, for example, |
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"ppc-fbsd-gnu-glibc" would indicate a Gentoo system corresponding to |
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a ppc architecture running the FreeBSD kernel with a GNU userland and glibc |
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as the system C library.</p> |
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</div> |
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<div class="section"> |
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<h2><a class="toc-backref" href="#id20" id="reasonable-defaults" name="reasonable-defaults">Reasonable Defaults</a></h2> |
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<p>To keep this system manageable (and both to reduce typing and maintain |
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backwards compatibility), we need sensible defaults. For backwards |
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compatibility, the Gentoo default is a Linux kernel with a GNU userland |
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and glibc C library. Thus, the current crop of ARCH-based keywords |
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(x86, ppc, etcetera) require no change whatsoever. For the *BSD-based |
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systems the default USERLAND and LIBC would be those normally associated |
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with the corresponding KERNEL, so "x86-obsd" describes an x86 system |
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with an OpenBSD kernel, a BSD userland, and the OpenBSD C library. If |
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either USERLAND or LIBC is specified, and thus not the default, then the |
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entire four-parameter string must be used.</p> |
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</div> |
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<div class="section"> |
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<h2><a class="toc-backref" href="#id21" id="ebuild-keyword-database" name="ebuild-keyword-database">Ebuild Keyword Database?</a></h2> |
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<p>One issue that has been raised is that adding a large number of keywords |
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to ebuilds is likely to become cumbersome over the long run. (One could |
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imagine that for a simple <cite>econf && emake && einstall</cite> ebuild that the |
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list of keywords could grow to be the lengthiest part of the ebuild.) |
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Instead, perhaps it would make more sense to move each ebuild's keywords |
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out of the ebuild proper into a separate, perhaps online, database. |
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Nothing in this GLEP would be incompatible with such an approach, so |
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any further discussion will be deferred to a possible future GLEP on |
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that topic.</p> |
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</div> |
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<div class="section"> |
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<h2><a class="toc-backref" href="#id22" id="profiles" name="profiles">Profiles</a></h2> |
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<p>Along with an explosion of keywords comes a concomitant explosion of potential |
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profiles. Just as in the current system, the profile name would be |
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"FLAVOR-KEYWORD-VERSION" (such as "default-s390-2004.1"). One drawback |
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to having a large number of profiles is that maintainance becomes a |
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significant problem. In fact, one could reasonably argue that the current |
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number of profiles is already too many to be easily maintained. One proposal |
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that has been raised to simplify matters is the idea of stackable, or |
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cascading, profiles, so that only differences between profiles would have to |
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be maintained.</p> |
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</div> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id23" id="rationale" name="rationale">Rationale</a></h1> |
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<p>The proposed new "keywording" system is far from elegant, which is |
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a substantial drawback. On the other hand, it is simple, it requires |
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relatively minor changes, and the changes can be implemented |
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gradually over time.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id24" id="implementation" name="implementation">Implementation</a></h1> |
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<p>Since the new keyword system is backwards-compatible with the current |
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system, "implementation" just means adding new keywords to ebuilds |
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as new systems are supported.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id25" id="backwards-compatibility" name="backwards-compatibility">Backwards Compatibility</a></h1> |
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<p>Backwards compatibility has already been addressed in some detail, |
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with the stated goal being a system that would leave all current |
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ebuilds working exactly as they are now.</p> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id26" id="id1" name="id1">References</a></h1> |
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<table class="docutils footnote" frame="void" id="id2" rules="none"> |
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<colgroup><col class="label" /><col /></colgroup> |
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<tbody valign="top"> |
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<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> |
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</tbody> |
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</table> |
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<table class="docutils footnote" frame="void" id="id5" rules="none"> |
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<colgroup><col class="label" /><col /></colgroup> |
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<tbody valign="top"> |
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<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> |
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</tbody> |
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</table> |
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<table class="docutils footnote" frame="void" id="id8" rules="none"> |
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<colgroup><col class="label" /><col /></colgroup> |
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<tbody valign="top"> |
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<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> |
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</tbody> |
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</table> |
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<table class="docutils footnote" frame="void" id="id10" rules="none"> |
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<colgroup><col class="label" /><col /></colgroup> |
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<tbody valign="top"> |
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<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> |
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</tbody> |
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</table> |
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<table class="docutils footnote" frame="void" id="id12" rules="none"> |
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<colgroup><col class="label" /><col /></colgroup> |
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<tbody valign="top"> |
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<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> |
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</tbody> |
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</table> |
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</div> |
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<div class="section"> |
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<h1><a class="toc-backref" href="#id27" id="copyright" name="copyright">Copyright</a></h1> |
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<p>This document has been placed in the public domain.</p> |
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