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8 <title>GLEP 54 -- scm package version suffix</title>
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26 <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">54</td>
27 </tr>
28 <tr class="field"><th class="field-name">Title:</th><td class="field-body">scm package version suffix</td>
29 </tr>
30 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.5</td>
31 </tr>
32 <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>
33 </tr>
34 <tr class="field"><th class="field-name">Author:</th><td class="field-body">Piotr JaroszyƄski &lt;peper&#32;&#97;t&#32;gentoo.org&gt;</td>
35 </tr>
36 <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td>
37 </tr>
38 <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
39 </tr>
40 <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>
41 </tr>
42 <tr class="field"><th class="field-name">Created:</th><td class="field-body">09-Dec-2007</td>
43 </tr>
44 <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">09-Dec-2007</td>
45 </tr>
46 </tbody>
47 </table>
48 <hr />
49 <div class="contents topic" id="contents">
50 <p class="topic-title first">Contents</p>
51 <ul class="simple">
52 <li><a class="reference internal" href="#abstract" id="id2">Abstract</a></li>
53 <li><a class="reference internal" href="#motivation" id="id3">Motivation</a></li>
54 <li><a class="reference internal" href="#specification" id="id4">Specification</a></li>
55 <li><a class="reference internal" href="#version-comparison" id="id5">Version Comparison</a></li>
56 <li><a class="reference internal" href="#backwards-compatibility" id="id6">Backwards Compatibility</a></li>
57 <li><a class="reference internal" href="#copyright" id="id7">Copyright</a></li>
58 </ul>
59 </div>
60 <div class="section" id="abstract">
61 <h1><a class="toc-backref" href="#id2">Abstract</a></h1>
62 <p>This GLEP proposes addition of a new special package version suffix - <tt class="docutils literal">scm</tt> -
63 for ebuilds checking out source directly from a source code management system.</p>
64 </div>
65 <div class="section" id="motivation">
66 <h1><a class="toc-backref" href="#id3">Motivation</a></h1>
67 <p>Currently there is no standard way of identifying SCM ebuilds. Using 9999 as the
68 version is pretty common, but it is handled like any other ebuild and hence
69 portage cannot provide any additional features for packages with such a version.
70 Another way is adding a separate package with a -cvs suffix in its name, but
71 that forces the author to use <tt class="docutils literal">|| ( cat/pkg <span class="pre">cat/pkg-cvs</span> )</tt> dependencies. The
72 closest to what is proposed in this GLEP is the <tt class="docutils literal">cvs</tt> version part, but its
73 implementation is of very limited use. It has strange comparison rules, no
74 documentation, has been used sparingly (if ever) and has a misleading name.</p>
75 <p>The possibility for package managers to recognise SCM ebuilds would allow them
76 to add features dedicated specially to said ebuilds. One such feature could be
77 automatic re-installation of SCM packages once a day or week. Any
78 specifications for such features are beyond the scope of this GLEP.</p>
79 </div>
80 <div class="section" id="specification">
81 <h1><a class="toc-backref" href="#id4">Specification</a></h1>
82 <p><tt class="docutils literal">scm</tt> is a special suffix. It can be used on its own, but also in any other
83 valid version spec, just before the place where revision would go. And just like
84 revision it can be used only once in a version spec, e.g.:</p>
85 <blockquote>
86 <ul class="simple">
87 <li><tt class="docutils literal"><span class="pre">cat/pkg-1.0_alpha0-scm</span></tt></li>
88 <li><tt class="docutils literal"><span class="pre">cat/pkg-1.0_alpha-scm</span></tt></li>
89 <li><tt class="docutils literal"><span class="pre">cat/pkg-1.0-scm-r3</span></tt></li>
90 <li><tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span></tt></li>
91 <li><tt class="docutils literal"><span class="pre">cat/pkg-1-scm-r2</span></tt></li>
92 <li><tt class="docutils literal"><span class="pre">cat/pkg-scm</span></tt></li>
93 </ul>
94 </blockquote>
95 <p>These package atoms are sorted in ascending order (see <a class="reference internal" href="#version-comparison">Version Comparison</a>).</p>
96 </div>
97 <div class="section" id="version-comparison">
98 <h1><a class="toc-backref" href="#id5">Version Comparison</a></h1>
99 <p>The addition of the scm suffix yields changes in version comparison:</p>
100 <blockquote>
101 <ul class="simple">
102 <li>When comparing version components from left to right the scm component has the
103 highest priority over other version components. Hence
104 <tt class="docutils literal"><span class="pre">pkg-1_alpha-r3</span> &lt; <span class="pre">pkg-1-scm</span></tt>, 'scm' is greater than 'alpha-r3'.</li>
105 <li>Current suffixes with no number part no longer default to zero if they are
106 followed by an scm suffix. If that's the case the number part is considered
107 to be of a maximum value. Hence <tt class="docutils literal"><span class="pre">1_alpha2-scm</span> &lt; <span class="pre">1_alpha-scm</span></tt>, but still
108 <tt class="docutils literal">1_alpha == 1_alpha0</tt>. The rationale behind this choice is to allow
109 multiple branches. For instance imagine a package with an alpha branch
110 and multiple scm releases, as the following: <tt class="docutils literal"><span class="pre">alpha-scm</span></tt>,
111 <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
112 for <tt class="docutils literal"><span class="pre">alpha-scm</span></tt> to be greater than all other branches of the same tree.</li>
113 </ul>
114 </blockquote>
115 <p>Example parsing:</p>
116 <blockquote>
117 <ul>
118 <li><dl class="first docutils">
119 <dt><tt class="docutils literal"><span class="pre">cat/pkg-scm</span> &gt; <span class="pre">cat/pkg-1</span></tt></dt>
120 <dd><p class="first last">When parsing from left to right the first difference is <tt class="docutils literal">scm</tt> and
121 <tt class="docutils literal">1</tt>. <tt class="docutils literal"><span class="pre">cat/pkg-scm</span></tt> wins.</p>
122 </dd>
123 </dl>
124 </li>
125 <li><dl class="first docutils">
126 <dt><tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span> &gt; <span class="pre">cat/pkg-1.0-scm</span></tt></dt>
127 <dd><p class="first last">When parsing from left to right the first difference is <tt class="docutils literal">scm</tt> and
128 <tt class="docutils literal">0</tt>. <tt class="docutils literal"><span class="pre">cat/pkg-1-scm</span></tt> wins.</p>
129 </dd>
130 </dl>
131 </li>
132 <li><dl class="first docutils">
133 <dt><tt class="docutils literal"><span class="pre">cat/pkg-1_alpha-scm</span> &gt; <span class="pre">cat/pkg-1_alpha1-scm</span></tt></dt>
134 <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>
135 is followed by an <tt class="docutils literal">scm</tt> suffix, hence it is considered to have a maximum
136 value as the number part. When parsing from left to right the first
137 difference is the number part of the <tt class="docutils literal">alpha</tt> suffix. Maximum value
138 yielded by the following <tt class="docutils literal">scm</tt> suffix wins with <tt class="docutils literal">1</tt>.</p>
139 </dd>
140 </dl>
141 </li>
142 </ul>
143 </blockquote>
144 <p>List of version specs in ascending order:</p>
145 <blockquote>
146 <ul class="simple">
147 <li><tt class="docutils literal">1</tt></li>
148 <li><tt class="docutils literal"><span class="pre">1.1-scm</span></tt></li>
149 <li><tt class="docutils literal"><span class="pre">1.2_alpha-scm</span></tt></li>
150 <li><tt class="docutils literal">1.2_beta_p</tt></li>
151 <li><tt class="docutils literal"><span class="pre">1.2_beta_p0-scm</span></tt></li>
152 <li><tt class="docutils literal"><span class="pre">1.2_beta_p1-scm</span></tt></li>
153 <li><tt class="docutils literal"><span class="pre">1.2_beta_p-scm</span></tt></li>
154 <li><tt class="docutils literal"><span class="pre">1.2_beta1_p-scm</span></tt></li>
155 <li><tt class="docutils literal">1.2_beta10</tt></li>
156 <li><tt class="docutils literal"><span class="pre">1.2_beta10_p1-scm</span></tt></li>
157 <li><tt class="docutils literal"><span class="pre">1.2_beta10-scm</span></tt></li>
158 <li><tt class="docutils literal"><span class="pre">1.2_beta-scm</span></tt></li>
159 <li><tt class="docutils literal">1.2</tt></li>
160 <li><tt class="docutils literal"><span class="pre">1.2-scm</span></tt></li>
161 <li><tt class="docutils literal"><span class="pre">1.2-scm-r1</span></tt></li>
162 <li><tt class="docutils literal"><span class="pre">1-scm</span></tt></li>
163 <li><tt class="docutils literal">10</tt></li>
164 <li><tt class="docutils literal">scm</tt></li>
165 <li><tt class="docutils literal"><span class="pre">scm-r3</span></tt></li>
166 </ul>
167 </blockquote>
168 </div>
169 <div class="section" id="backwards-compatibility">
170 <h1><a class="toc-backref" href="#id6">Backwards Compatibility</a></h1>
171 <p>Portage versions prior to (included in 2007.0) don't handle arbitrary
172 version suffixes and die during various tasks making portage hard or impossible
173 to use. Later versions just ignore them displaying warnings. Hence use of
174 <tt class="docutils literal">scm</tt> suffixes in gentoo-x86 tree will probably have to wait till 2008.0
175 release or later.</p>
176 </div>
177 <div class="section" id="copyright">
178 <h1><a class="toc-backref" href="#id7">Copyright</a></h1>
179 <p>This document has been placed in the public domain.</p>
180 <!-- vim: set tw=80 fileencoding=utf-8 spell spelllang=en et : -->
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