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<title>GLEP 54 -- scm package version suffix</title> |
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[<b><a href="http://www.gentoo.org/proj/en/glep/glep-0054.txt">GLEP Source</a></b>] |
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<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">54</td> |
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<tr class="field"><th class="field-name">Title:</th><td class="field-body">scm package version suffix</td> |
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</tr> |
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<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.5</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 external" href="http://www.gentoo.org/cgi-bin/viewcvs.cgi/xml/htdocs/proj/en/glep/glep-0054.txt?cvsroot=gentoo">2008/01/06 02:08:59</a></td> |
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</tr> |
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<tr class="field"><th class="field-name">Author:</th><td class="field-body">Piotr Jaroszyński <peper 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">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 external" href="glep-0002.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">09-Dec-2007</td> |
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</tr> |
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<tr class="field"><th class="field-name">Post-History:</th><td class="field-body">09-Dec-2007</td> |
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</tr> |
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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">Contents</p> |
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<ul class="simple"> |
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<li><a class="reference internal" href="#abstract" id="id2">Abstract</a></li> |
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<li><a class="reference internal" href="#motivation" id="id3">Motivation</a></li> |
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<li><a class="reference internal" href="#specification" id="id4">Specification</a></li> |
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<li><a class="reference internal" href="#version-comparison" id="id5">Version Comparison</a></li> |
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<li><a class="reference internal" href="#backwards-compatibility" id="id6">Backwards Compatibility</a></li> |
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<li><a class="reference internal" href="#copyright" id="id7">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="#id2">Abstract</a></h1> |
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<p>This GLEP proposes addition of a new special package version suffix - <tt class="docutils literal">scm</tt> - |
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for ebuilds checking out source directly from a source code management system.</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="#id3">Motivation</a></h1> |
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<p>Currently there is no standard way of identifying SCM ebuilds. Using 9999 as the |
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version is pretty common, but it is handled like any other ebuild and hence |
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portage cannot provide any additional features for packages with such a version. |
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Another way is adding a separate package with a -cvs suffix in its name, but |
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that forces the author to use <tt class="docutils literal">|| ( cat/pkg <span class="pre">cat/pkg-cvs</span> )</tt> dependencies. The |
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closest to what is proposed in this GLEP is the <tt class="docutils literal">cvs</tt> version part, but its |
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implementation is of very limited use. It has strange comparison rules, no |
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documentation, has been used sparingly (if ever) and has a misleading name.</p> |
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<p>The possibility for package managers to recognise SCM ebuilds would allow them |
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to add features dedicated specially to said ebuilds. One such feature could be |
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automatic re-installation of SCM packages once a day or week. Any |
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specifications for such features are beyond the scope of this GLEP.</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="#id4">Specification</a></h1> |
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<p><tt class="docutils literal">scm</tt> is a special suffix. It can be used on its own, but also in any other |
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valid version spec, just before the place where revision would go. And just like |
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revision it can be used only once in a version spec, e.g.:</p> |
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<blockquote> |
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<ul class="simple"> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-1.0_alpha0-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-1.0_alpha-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-1.0-scm-r3</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-1-scm-r2</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">cat/pkg-scm</span></tt></li> |
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</ul> |
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</blockquote> |
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<p>These package atoms are sorted in ascending order (see <a class="reference internal" href="#version-comparison">Version Comparison</a>).</p> |
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</div> |
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<div class="section" id="version-comparison"> |
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<h1><a class="toc-backref" href="#id5">Version Comparison</a></h1> |
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<p>The addition of the scm suffix yields changes in version comparison:</p> |
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<blockquote> |
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<ul class="simple"> |
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<li>When comparing version components from left to right the scm component has the |
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highest priority over other version components. Hence |
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<tt class="docutils literal"><span class="pre">pkg-1_alpha-r3</span> < <span class="pre">pkg-1-scm</span></tt>, 'scm' is greater than 'alpha-r3'.</li> |
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<li>Current suffixes with no number part no longer default to zero if they are |
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followed by an scm suffix. If that's the case the number part is considered |
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to be of a maximum value. Hence <tt class="docutils literal"><span class="pre">1_alpha2-scm</span> < <span class="pre">1_alpha-scm</span></tt>, but still |
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<tt class="docutils literal">1_alpha == 1_alpha0</tt>. The rationale behind this choice is to allow |
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multiple branches. For instance imagine a package with an alpha branch |
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and multiple scm releases, as the following: <tt class="docutils literal"><span class="pre">alpha-scm</span></tt>, |
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<tt class="docutils literal"><span class="pre">alpha2-scm</span></tt>, <tt class="docutils literal"><span class="pre">alpha3-scm</span></tt> and so forth. The desired outcome is |
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for <tt class="docutils literal"><span class="pre">alpha-scm</span></tt> to be greater than all other branches of the same tree.</li> |
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</ul> |
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</blockquote> |
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<p>Example parsing:</p> |
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<ul> |
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<li><dl class="first docutils"> |
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<dt><tt class="docutils literal"><span class="pre">cat/pkg-scm</span> > <span class="pre">cat/pkg-1</span></tt></dt> |
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<dd><p class="first last">When parsing from left to right the first difference is <tt class="docutils literal">scm</tt> and |
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<tt class="docutils literal">1</tt>. <tt class="docutils literal"><span class="pre">cat/pkg-scm</span></tt> wins.</p> |
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</dd> |
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</dl> |
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</li> |
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<li><dl class="first docutils"> |
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<dt><tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span> > <span class="pre">cat/pkg-1.0-scm</span></tt></dt> |
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<dd><p class="first last">When parsing from left to right the first difference is <tt class="docutils literal">scm</tt> and |
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<tt class="docutils literal">0</tt>. <tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span></tt> wins.</p> |
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</dd> |
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</dl> |
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</li> |
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<li><dl class="first docutils"> |
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<dt><tt class="docutils literal"><span class="pre">cat/pkg-1_alpha-scm</span> > <span class="pre">cat/pkg-1_alpha1-scm</span></tt></dt> |
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<dd><p class="first last">In the first package version <tt class="docutils literal">alpha</tt> doesn't have a number part <em>and</em> |
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is followed by an <tt class="docutils literal">scm</tt> suffix, hence it is considered to have a maximum |
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value as the number part. When parsing from left to right the first |
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difference is the number part of the <tt class="docutils literal">alpha</tt> suffix. Maximum value |
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yielded by the following <tt class="docutils literal">scm</tt> suffix wins with <tt class="docutils literal">1</tt>.</p> |
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</dd> |
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</dl> |
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</li> |
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</ul> |
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</blockquote> |
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<p>List of version specs in ascending order:</p> |
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<ul class="simple"> |
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<li><tt class="docutils literal">1</tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.1-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_alpha-scm</span></tt></li> |
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<li><tt class="docutils literal">1.2_beta_p</tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta_p0-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta_p1-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta_p-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta1_p-scm</span></tt></li> |
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<li><tt class="docutils literal">1.2_beta10</tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta10_p1-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta10-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2_beta-scm</span></tt></li> |
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<li><tt class="docutils literal">1.2</tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2-scm</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1.2-scm-r1</span></tt></li> |
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<li><tt class="docutils literal"><span class="pre">1-scm</span></tt></li> |
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<li><tt class="docutils literal">10</tt></li> |
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<li><tt class="docutils literal">scm</tt></li> |
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<li><tt class="docutils literal"><span class="pre">scm-r3</span></tt></li> |
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</ul> |
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</blockquote> |
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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="#id6">Backwards Compatibility</a></h1> |
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<p>Portage versions prior to 2.1.2.12 (included in 2007.0) don't handle arbitrary |
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version suffixes and die during various tasks making portage hard or impossible |
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to use. Later versions just ignore them displaying warnings. Hence use of |
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<tt class="docutils literal">scm</tt> suffixes in gentoo-x86 tree will probably have to wait till 2008.0 |
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release or later.</p> |
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</div> |
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<div class="section" id="copyright"> |
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<h1><a class="toc-backref" href="#id7">Copyright</a></h1> |
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<p>This document has been placed in the public domain.</p> |
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<!-- vim: set tw=80 fileencoding=utf-8 spell spelllang=en et : --> |
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<hr class="footer" /> |
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<a class="reference external" href="glep-0054.txt">View document source</a>. |
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Generated on: 2010-04-07 22:10 UTC. |
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Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. |
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