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12     <title>GLEP 9 -- Gentoo Package Update System</title>
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24     [<b><a href="http://www.gentoo.org/proj/en/glep">GLEP Index</a></b>]
25     [<b><a href="http://www.gentoo.org/proj/en/glep/glep-0009.txt">GLEP Source</a></b>]
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27     <div class="document">
28     <table class="rfc2822 field-list" frame="void" rules="none">
29     <col class="field-name" />
30     <col class="field-body" />
31     <tbody valign="top">
32     <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">9</td>
33     </tr>
34     <tr class="field"><th class="field-name">Title:</th><td class="field-body">Gentoo Package Update System</td>
35     </tr>
36     <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.2</td>
37     </tr>
38     <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference" href="http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo/xml/htdocs/proj/en/glep/glep-0009.txt">2003/07/25 22:32:20</a></td>
39     </tr>
40     <tr class="field"><th class="field-name">Author:</th><td class="field-body">John J. Whitney &lt;jjw&#32;&#97;t&#32;linuxmail.org&gt;</td>
41     </tr>
42     <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td>
43     </tr>
44     <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
45     </tr>
46     <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>
47     </tr>
48     <tr class="field"><th class="field-name">Created:</th><td class="field-body">19-Jul-2003</td>
49     </tr>
50     <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">25-Jul-2003</td>
51     </tr>
52     </tbody>
53     </table>
54     <hr />
55     <div class="contents topic" id="contents">
56     <p class="topic-title"><a name="contents">Contents</a></p>
57     <ul class="simple">
58     <li><a class="reference" href="#abstract" id="id3" name="id3">Abstract</a></li>
59     <li><a class="reference" href="#motivation" id="id4" name="id4">Motivation</a></li>
60     <li><a class="reference" href="#server-implementation" id="id5" name="id5">Server Implementation</a></li>
61     <li><a class="reference" href="#client-implementation" id="id6" name="id6">Client Implementation</a></li>
62     <li><a class="reference" href="#rationale" id="id7" name="id7">Rationale</a></li>
63     <li><a class="reference" href="#backwards-compatibility" id="id8" name="id8">Backwards Compatibility</a></li>
64     <li><a class="reference" href="#conclusion" id="id9" name="id9">Conclusion</a></li>
65     <li><a class="reference" href="#references" id="id10" name="id10">References</a></li>
66     <li><a class="reference" href="#copyright" id="id11" name="id11">Copyright</a></li>
67     </ul>
68     </div>
69     <div class="section" id="abstract">
70     <h1><a class="toc-backref" href="#id3" name="abstract">Abstract</a></h1>
71     <p>This document proposes an official package updating system for Gentoo Linux.
72     The Deltup project has been developed for this purpose. <a class="footnote-reference" href="#deltup" id="id1" name="id1">[1]</a></p>
73     <p>As packages grow larger the amount of redundant data keeps increasing. Updating
74     existing tarballs by patching is the natural way to handle source updates.</p>
75     </div>
76     <div class="section" id="motivation">
77     <h1><a class="toc-backref" href="#id4" name="motivation">Motivation</a></h1>
78     <p>This system will reduce mirror loads (potentially mirror size as well) and
79     significantly speed up downloads, making Gentoo much more attractive for users
80     with low-bandwidth connections.</p>
81     </div>
82     <div class="section" id="server-implementation">
83     <h1><a class="toc-backref" href="#id5" name="server-implementation">Server Implementation</a></h1>
84     <p>I propose that the patches be put onto the Gentoo Mirrors and stored in a new
85     directory called &quot;patchfiles&quot; which could be placed beside &quot;distfiles&quot;.</p>
86     <p>It would be advantageous to have a list of available patches within the portage
87     tree so that it can be updated during &quot;emerge sync&quot;. A file named &quot;dtu.list&quot;
88     can be created and placed in $PORTDIR/profiles.</p>
89     <p>If a machine can be set up to generate patches it should contain a local mirror
90     of distfiles which it can monitor for added packages. When a package is added
91     to distfiles the machine can try to determine the previous tarball so a patch
92     can be made and placed in the patchfiles dir. In addition, special-case patches
93     can be added manually.</p>
94     <p>The dtu.list file will be maintained by a special script. Whenever patches
95     are added or removed to the patchfiles dir, the script will make necessary
96     additions/removals in dtu.list. This will be done with minimal changes in the
97     file so it can be synchronized efficiently.</p>
98     </div>
99     <div class="section" id="client-implementation">
100     <h1><a class="toc-backref" href="#id6" name="client-implementation">Client Implementation</a></h1>
101     <p>The system will be optional for users and can be enabled by making portage
102     invoke efetch through the FETCHCOMMAND environment variable <a class="footnote-reference" href="#tinyhowto" id="id2" name="id2">[3]</a>.</p>
103     <p>When a package fetch is requested, the efetch/fetchcommand scripts (part of
104     Deltup) will scan the dtu.list file for updates and try downloading and applying
105     them if they exist, or fall back to a full package download if they don't or if
106     the patching process fails.</p>
107     </div>
108     <div class="section" id="rationale">
109     <h1><a class="toc-backref" href="#id7" name="rationale">Rationale</a></h1>
110     <p>The most controversial feature has been the addition of dtu.list to the portage
111     tree, so in this section I will list the reasons I support it.</p>
112     <ul class="simple">
113     <li>Flexibility. Without it, there must be a standard naming scheme which we
114     would be stuck with once the system is in place. Changing the system would
115     require serious compatibility breaks. With the dtu.list file we can change
116     the naming scheme easily without problems, or even have several different
117     naming schemes.</li>
118     <li>Features. Without patch information detecting different upgrade paths would
119     be impossible. Split package patching would also be impossible. If the info
120     is available we can use it to find the quickest upgrade path, like jumping
121     from a .0 release, or even disable certain patches if there are problems with
122     them.</li>
123     <li>It would be impossible to know which packages to upgrade from in some cases,
124     including renamed packages.</li>
125     <li>Knowing which patches are available will eliminate the overhead of attempting
126     to download patches which don't exist.</li>
127     </ul>
128     <p>The dtu.list file will contain several hundred kilobytes of data. That has
129     caused some concern over how efficiently it can be rsynced. To address these
130     concerns the file's format will be plaintext and care has been taken to
131     minimize the number of changes as removals/additions are made.</p>
132     </div>
133     <div class="section" id="backwards-compatibility">
134     <h1><a class="toc-backref" href="#id8" name="backwards-compatibility">Backwards Compatibility</a></h1>
135     <p>There are no backwards compatibility issues since Deltup can generate correct
136     package MD5sums.</p>
137     </div>
138     <div class="section" id="conclusion">
139     <h1><a class="toc-backref" href="#id9" name="conclusion">Conclusion</a></h1>
140     <p>I suggest we start with a scaled-down implementation and provide more as the
141     demand increases. All of the necesary code is already written and working in
142     non-official tests.</p>
143     </div>
144     <div class="section" id="references">
145     <h1><a class="toc-backref" href="#id10" name="references">References</a></h1>
146     <table class="footnote" frame="void" id="deltup" rules="none">
147     <colgroup><col class="label" /><col /></colgroup>
148     <tbody valign="top">
149     <tr><td class="label"><a class="fn-backref" href="#id1" name="deltup">[1]</a></td><td><a class="reference" href="http://sourceforge.net/projects/deltup">http://sourceforge.net/projects/deltup</a></td></tr>
150     </tbody>
151     </table>
152     <table class="footnote" frame="void" id="patches" rules="none">
153     <colgroup><col class="label" /><col /></colgroup>
154     <tbody valign="top">
155     <tr><td class="label"><a name="patches">[2]</a></td><td><a class="reference" href="ftp://sunsite.dk/projects/deltup/patchfiles">ftp://sunsite.dk/projects/deltup/patchfiles</a></td></tr>
156     </tbody>
157     </table>
158     <table class="footnote" frame="void" id="tinyhowto" rules="none">
159     <colgroup><col class="label" /><col /></colgroup>
160     <tbody valign="top">
161     <tr><td class="label"><a class="fn-backref" href="#id2" name="tinyhowto">[3]</a></td><td>Tiny Deltup HOWTO
162     (<a class="reference" href="http://www.thedoh.com/linux/HOWTO/deltup">http://www.thedoh.com/linux/HOWTO/deltup</a>)</td></tr>
163     </tbody>
164     </table>
165     </div>
166     <div class="section" id="copyright">
167     <h1><a class="toc-backref" href="#id11" name="copyright">Copyright</a></h1>
168     <p>This document has been placed in the public domain.</p>
169     </div>
170     </div>
172     <hr class="footer"/>
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