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<meta name="generator" content="Docutils 0.3.3: http://docutils.sourceforge.net/" /> |
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<title>GLEP 31 -- Character Sets for Portage Tree Items</title> |
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<link rel="stylesheet" href="tools/glep.css" type="text/css" /> |
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width="100%" border="0"> |
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<tr><td class="navicon" width="150" height="35"> |
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<a href="http://www.gentoo.org/" title="Gentoo Linux Home Page"> |
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border="0" width="150" height="35" /></a></td> |
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<td class="textlinks" align="left"> |
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[<b><a href="http://www.gentoo.org/">Gentoo Linux Home</a></b>] |
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[<b><a href="http://www.gentoo.org/proj/en/glep">GLEP Index</a></b>] |
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[<b><a href="./glep-0031.txt">GLEP Source</a></b>] |
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<table class="rfc2822 field-list" frame="void" rules="none"> |
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<col class="field-body" /> |
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<tbody valign="top"> |
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<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">31</td> |
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</tr> |
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<tr class="field"><th class="field-name">Title:</th><td class="field-body">Character Sets for Portage Tree Items</td> |
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</tr> |
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<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.1</td> |
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</tr> |
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<tr class="field"><th class="field-name">Author:</th><td class="field-body">Ciaran McCreesh <ciaranm at gentoo.org></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/xml/htdocs/proj/en/glep/glep-0031.txt?cvsroot=gentoo">2004/10/28 17:00:22</a></td> |
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</tr> |
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<tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</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> |
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<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> |
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</tr> |
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<tr class="field"><th class="field-name">Created:</th><td class="field-body">27-October-2004</td> |
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</tr> |
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<tr class="field"><th class="field-name">Post-Date:</th><td class="field-body">28-October-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" id="contents"> |
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<p class="topic-title first"><a name="contents">Contents</a></p> |
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<ul class="simple"> |
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<li><a class="reference" href="#abstract" id="id7" name="id7">Abstract</a></li> |
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<li><a class="reference" href="#motivation" id="id8" name="id8">Motivation</a></li> |
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<li><a class="reference" href="#specification" id="id9" name="id9">Specification</a><ul> |
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<li><a class="reference" href="#changelog-and-metadata-character-sets" id="id10" name="id10">ChangeLog and Metadata Character Sets</a></li> |
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<li><a class="reference" href="#ebuild-and-eclass-character-sets" id="id11" name="id11">Ebuild and Eclass Character Sets</a></li> |
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<li><a class="reference" href="#files-entries-character-sets" id="id12" name="id12">files/ Entries Character Sets</a></li> |
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<li><a class="reference" href="#suitable-characters-for-file-and-directory-names" id="id13" name="id13">Suitable Characters for File and Directory Names</a></li> |
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</ul> |
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</li> |
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<li><a class="reference" href="#backwards-compatibility" id="id14" name="id14">Backwards Compatibility</a></li> |
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<li><a class="reference" href="#references" id="id15" name="id15">References</a></li> |
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<li><a class="reference" href="#copyright" id="id16" name="id16">Copyright</a></li> |
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</ul> |
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</div> |
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<div class="section" id="abstract"> |
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<h1><a class="toc-backref" href="#id7" name="abstract">Abstract</a></h1> |
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<p>A set of rules regarding what characters are permissible in the portage |
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tree and how they should be encoded is required.</p> |
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</div> |
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<div class="section" id="motivation"> |
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<h1><a class="toc-backref" href="#id8" name="motivation">Motivation</a></h1> |
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<p>At present we have several developers and many more users whose names |
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require characters (for example, accents) which are not part of the |
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standard 'safe' 0..127 ASCII range. There is no current standard on how |
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these should be represented, leading to inconsistency across the tree.</p> |
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<p>Although the issues involved have been discussed many times informally, no |
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official decision has been made.</p> |
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</div> |
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<div class="section" id="specification"> |
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<h1><a class="toc-backref" href="#id9" name="specification">Specification</a></h1> |
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<div class="section" id="changelog-and-metadata-character-sets"> |
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<h2><a class="toc-backref" href="#id10" name="changelog-and-metadata-character-sets">ChangeLog and Metadata Character Sets</a></h2> |
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<p>It is proposed that UTF-8 (<a class="footnote-reference" href="#id4" id="id1" name="id1">[1]</a>) is used for encoding ChangeLog and |
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metadata.xml files inside the portage tree.</p> |
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<p>UTF-8 allows the full range of Unicode (<a class="footnote-reference" href="#id5" id="id2" name="id2">[2]</a>) characters to be expressed, |
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which is necessary given the diversity of the Gentoo developer- and |
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user-base. It is character-compatible with ASCII for the 0..127 |
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characters and does not significantly increase the storage requirements |
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for files which consist mainly of American English characters. It is |
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widely supported, widely used and an official standard.</p> |
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<p>The ISO-8859-* character sets (<a class="footnote-reference" href="#id6" id="id3" name="id3">[3]</a>) would <em>not</em> be appropriate since they |
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cannot express the full range of required characters.</p> |
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</div> |
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<div class="section" id="ebuild-and-eclass-character-sets"> |
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<h2><a class="toc-backref" href="#id11" name="ebuild-and-eclass-character-sets">Ebuild and Eclass Character Sets</a></h2> |
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<p>For the same reasons as previously, it is proposed that UTF-8 is used as |
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the official encoding for ebuild and eclass files.</p> |
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<p>However, developers should be warned that any output which is parsed by |
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bash (in other words, non-comments), and any output which is echoed to the |
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screen (for example, einfo messages) must not use anything outside the |
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regular ASCII 0..127 range for compatibility purposes.</p> |
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</div> |
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<div class="section" id="files-entries-character-sets"> |
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<h2><a class="toc-backref" href="#id12" name="files-entries-character-sets">files/ Entries Character Sets</a></h2> |
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<p>Patches must clearly be in the same character set as the file they are |
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patching. For other files/ entries (for example, GNOME desktop files), |
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consistency with the upstream-recommended character set is most sensible.</p> |
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</div> |
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<div class="section" id="suitable-characters-for-file-and-directory-names"> |
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<h2><a class="toc-backref" href="#id13" name="suitable-characters-for-file-and-directory-names">Suitable Characters for File and Directory Names</a></h2> |
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<p>Characters outside the ASCII 0..127 range cannot safely be used for file |
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or directory names. (Of course, not all characters inside the ASCII 0..127 |
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range can be used safely either.)</p> |
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</div> |
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</div> |
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<div class="section" id="backwards-compatibility"> |
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<h1><a class="toc-backref" href="#id14" name="backwards-compatibility">Backwards Compatibility</a></h1> |
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<p>The existing tree uses a mixture of encodings. It would be straightforward |
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to fix existing ChangeLogs and metadata files to use UTF-8.</p> |
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<p>The <tt class="literal"><span class="pre">echangelog</span></tt> tool is character-set agnostic. In order to properly |
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enter UTF-8, developers would have to switch to a UTF-8 shell session. |
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This only applies if the developer is entering new text which uses 'fancy' |
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characters -- existing characters are not mangled.</p> |
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<p>Certain text editors are incapable of handling UTF-8 cleanly. However, |
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since the <tt class="literal"><span class="pre">echangelog</span></tt> tool is generally the correct way to generate |
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ChangeLog entries, this should not be a major problem. Generating |
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metadata.xml files correctly in these editors could become problematic. |
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(The <tt class="literal"><span class="pre">vim</span></tt> and <tt class="literal"><span class="pre">emacs</span></tt> editors, which appear to be most widely used, |
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are both capable of handling UTF-8 cleanly.)</p> |
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</div> |
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<div class="section" id="references"> |
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<h1><a class="toc-backref" href="#id15" name="references">References</a></h1> |
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<table class="footnote" frame="void" id="id4" 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="#id1" name="id4">[1]</a></td><td><a class="reference" href="http://www.faqs.org/rfcs/rfc3629.html">RFC 3629</a>: UTF-8, a transformation format of ISO 10646 |
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<a class="reference" href="http://www.ietf.org/rfc/rfc3629.txt">http://www.ietf.org/rfc/rfc3629.txt</a></td></tr> |
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</tbody> |
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</table> |
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<table class="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 class="fn-backref" href="#id2" name="id5">[2]</a></td><td>ISO/IEC 10646 (Universal Multiple-Octet Coded Character Set)</td></tr> |
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</tbody> |
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</table> |
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<table class="footnote" frame="void" id="id6" 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="#id3" name="id6">[3]</a></td><td>ISO/IEC 8859 (8-bit single-byte coded graphic character sets)</td></tr> |
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</tbody> |
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</table> |
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</div> |
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<div class="section" id="copyright"> |
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<h1><a class="toc-backref" href="#id16" name="copyright">Copyright</a></h1> |
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<p>This document has been placed in the public domain.</p> |
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<blockquote> |
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vim: set tw=74 fileencoding=utf-8 :</blockquote> |
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</div> |
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</div> |
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<hr class="footer" /> |
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<div class="footer"> |
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<a class="reference" href="glep-0031.txt">View document source</a>. |
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Generated on: 2004-10-28 16:53 UTC. |
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Generated by <a class="reference" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. |
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</div> |
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