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28     <col class="field-name" />
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31     <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">44</td>
32     </tr>
33     <tr class="field"><th class="field-name">Title:</th><td class="field-body">Manifest2 format</td>
34     </tr>
35 genone 1.4 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.3</td>
36 g2boojum 1.1 </tr>
37 genone 1.4 <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-0044.txt?cvsroot=gentoo">2006/01/23 10:24:24</a></td>
38 g2boojum 1.1 </tr>
39     <tr class="field"><th class="field-name">Author:</th><td class="field-body">Marius Mauch &lt;genone&#32;&#97;t&#32;gentoo.org&gt;,</td>
40     </tr>
41     <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td>
42     </tr>
43     <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
44     </tr>
45     <tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="http://www.python.org/peps/glep-0012.html">text/x-rst</a></td>
46     </tr>
47     <tr class="field"><th class="field-name">Created:</th><td class="field-body">04-Dec-2005</td>
48     </tr>
49 genone 1.3 <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">06-Dec-2005, 23-Jan-2006</td>
50 g2boojum 1.1 </tr>
51     </tbody>
52     </table>
53     <hr />
54     <div class="contents topic" id="contents">
55     <p class="topic-title first"><a name="contents">Contents</a></p>
56     <ul class="simple">
57 genone 1.4 <li><a class="reference" href="#abstract" id="id9" name="id9">Abstract</a></li>
58     <li><a class="reference" href="#motivation" id="id10" name="id10">Motivation</a></li>
59     <li><a class="reference" href="#specification" id="id11" name="id11">Specification</a><ul>
60     <li><a class="reference" href="#compability-entries" id="id12" name="id12">Compability Entries</a></li>
61     <li><a class="reference" href="#scope" id="id13" name="id13">Scope</a></li>
62     <li><a class="reference" href="#number-of-hashes" id="id14" name="id14">Number of hashes</a></li>
63 g2boojum 1.1 </ul>
64     </li>
65 genone 1.4 <li><a class="reference" href="#rationale" id="id15" name="id15">Rationale</a><ul>
66     <li><a class="reference" href="#removal-of-digest-files" id="id16" name="id16">Removal of digest files</a></li>
67     <li><a class="reference" href="#reducing-redundancy" id="id17" name="id17">Reducing redundancy</a></li>
68     <li><a class="reference" href="#removal-of-checksum-collisions" id="id18" name="id18">Removal of checksum collisions</a></li>
69     <li><a class="reference" href="#flexible-verification-system" id="id19" name="id19">Flexible verification system</a></li>
70 g2boojum 1.1 </ul>
71     </li>
72 genone 1.4 <li><a class="reference" href="#backwards-compatibility" id="id20" name="id20">Backwards Compatibility</a></li>
73     <li><a class="reference" href="#other-problems" id="id21" name="id21">Other problems</a><ul>
74     <li><a class="reference" href="#impacts-on-infrastructure" id="id22" name="id22">Impacts on infrastructure</a></li>
75 g2boojum 1.1 </ul>
76     </li>
77 genone 1.4 <li><a class="reference" href="#reference-implementation" id="id23" name="id23">Reference Implementation</a></li>
78     <li><a class="reference" href="#options" id="id24" name="id24">Options</a></li>
79     <li><a class="reference" href="#credits" id="id25" name="id25">Credits</a></li>
80     <li><a class="reference" href="#references" id="id26" name="id26">References</a></li>
81     <li><a class="reference" href="#copyright" id="id27" name="id27">Copyright</a></li>
82 g2boojum 1.1 </ul>
83     </div>
84     <div class="section" id="abstract">
85 genone 1.4 <h1><a class="toc-backref" href="#id9" name="abstract">Abstract</a></h1>
86 g2boojum 1.1 <p>This GLEP proposes a new format for the Portage Manifest and digest file system
87     by unifying both filetypes into one to improve functional and non-functional
88     aspects of the Portage Tree.</p>
89     </div>
90     <div class="section" id="motivation">
91 genone 1.4 <h1><a class="toc-backref" href="#id10" name="motivation">Motivation</a></h1>
92 g2boojum 1.1 <p>Please see <a class="footnote-reference" href="#reorg-thread" id="id1" name="id1">[1]</a> for a general overview.
93     The main long term goals of this proposal are to:</p>
94     <ul class="simple">
95     <li>Remove the tiny digest files from the tree. They are a major annoyance as on a
96 genone 1.3 typical configuration they waste a lot of disk space and the simple transmission
97 g2boojum 1.1 of the names for all digest files during a <tt class="docutils literal"><span class="pre">emerge</span> <span class="pre">--sync</span></tt> needs a substantial
98     amount of bandwidth.</li>
99     <li>Reduce redundancy when multiple hash functions are used</li>
100     <li>Remove potential for checksum collisions if a file is recorded in more than one
101     digest file</li>
102     <li>Difference between filetypes for a more flexible verification system</li>
103     </ul>
104     </div>
105     <div class="section" id="specification">
106 genone 1.4 <h1><a class="toc-backref" href="#id11" name="specification">Specification</a></h1>
107 g2boojum 1.1 <p>The new Manifest format would change the existing format in the following ways:</p>
108     <ul>
109     <li><p class="first">Addition of a filetype specifier, currently planned are</p>
110     <ul class="simple">
111 genone 1.4 <li><tt class="docutils literal"><span class="pre">AUX</span></tt> for files directly used by ebuilds (e.g. patches or initscripts),
112 g2boojum 1.1 located in the <tt class="docutils literal"><span class="pre">files/</span></tt> subdirectory</li>
113     <li><tt class="docutils literal"><span class="pre">EBUILD</span></tt> for all ebuilds</li>
114 genone 1.4 <li><tt class="docutils literal"><span class="pre">MISC</span></tt> for files not directly used by ebuilds like <tt class="docutils literal"><span class="pre">ChangeLog</span></tt> or
115 g2boojum 1.1 <tt class="docutils literal"><span class="pre">metadata.xml</span></tt> files</li>
116 genone 1.4 <li><tt class="docutils literal"><span class="pre">DIST</span></tt> for release tarballs recorded in the <tt class="docutils literal"><span class="pre">SRC_URI</span></tt> variable of an ebuild,
117 g2boojum 1.1 these were previously recorded in the digest files</li>
118     </ul>
119     <p>Future portage improvements might extend this list (for example with types
120     relevant for eclasses or profiles)</p>
121     </li>
122     <li><p class="first">Only have one line per file listing all information instead of one line per
123     file and checksum type</p>
124     </li>
125     <li><p class="first">Remove the separated digest-* files in the <tt class="docutils literal"><span class="pre">files/</span></tt> subdirectory</p>
126     </li>
127     </ul>
128     <p>Each line in the new format has the following format:</p>
129     <pre class="literal-block">
130     &lt;filetype&gt; &lt;filename&gt; &lt;filesize&gt; &lt;chksumtype1&gt; &lt;chksum1&gt; ... &lt;chksumtypen&gt; &lt;chksumn&gt;
131     </pre>
132     <p>However theses entries will be stored in the existing Manifest files.</p>
133 genone 1.4 <p>An <a class="reference" href="glep-0044-extras/manifest2-example">actual example</a> <a class="footnote-reference" href="#id7" id="id8" name="id8">[6]</a> for a (pure) Manifest2 file..</p>
134 g2boojum 1.1 <div class="section" id="compability-entries">
135 genone 1.4 <h2><a class="toc-backref" href="#id12" name="compability-entries">Compability Entries</a></h2>
136 g2boojum 1.1 <p>To maintain compability with existing portage versions a transition period after
137     is the introduction of the Manifest2 format is required during which portage
138     will not only have to be capable of using existing Manifest and digest files but
139     also generate them in addition to the new entries.
140     Fortunately this can be accomplished by simply mixing old and new style entries
141     in one file for the Manifest files, existing portage versions will simply ignore
142     the new style entries. For the digest files there are no new entries to care
143     about.</p>
144     </div>
145     <div class="section" id="scope">
146 genone 1.4 <h2><a class="toc-backref" href="#id13" name="scope">Scope</a></h2>
147 g2boojum 1.1 <p>It is important to note that this proposal only deals with a change of the
148     format of the digest and Manifest system.</p>
149     <p>It does not expand the scope of it to cover eclasses, profiles or anything
150     else not already covered by the Manifest system, it also doesn't affect
151     the Manifest signing efforts in any way (though the implementations of both
152     might be coupled).</p>
153     <p>Also while multiple hash functions will become standard with the proposed
154 genone 1.4 implementation they are not a specific feature of this format <a class="footnote-reference" href="#multi-hash-thread" id="id3" name="id3">[2]</a>.</p>
155     </div>
156     <div class="section" id="number-of-hashes">
157     <h2><a class="toc-backref" href="#id14" name="number-of-hashes">Number of hashes</a></h2>
158     <p>While using multiple hashes for each file is a major feature of this proposal
159     we have to make sure that the number of hashes listed is limited to avoid
160     an explosion of the Manifest size that would revert the main benefit of this proposal
161     (reduzing tree size). Therefore the number of hashes that will be generated
162     will be limited to three different hash functions. For compability though we
163     have to rely on at least one hash function to always be present, this proposal
164     suggest to use SHA1 for this purpose (as it is supposed to be more secure than MD5
165     and currently only SHA1 and MD5 are directly available in python, also MD5 doesn't
166     have any benefit in terms of compability).</p>
167 g2boojum 1.1 </div>
168     </div>
169     <div class="section" id="rationale">
170 genone 1.4 <h1><a class="toc-backref" href="#id15" name="rationale">Rationale</a></h1>
171 g2boojum 1.1 <p>The main goals of the proposal have been listed in the <a class="reference" href="#motivation">Motivation</a>, here now
172     the explanation why they are improvements and how the proposed format will
173     accomplish them.</p>
174     <div class="section" id="removal-of-digest-files">
175 genone 1.4 <h2><a class="toc-backref" href="#id16" name="removal-of-digest-files">Removal of digest files</a></h2>
176 g2boojum 1.1 <p>Normal users that don't use a &quot;tuned&quot; filesystem for the portage tree are
177 genone 1.3 wasting several dozen to a few hundred megabytes of disk space with the current
178 g2boojum 1.1 system, largely caused by the digest files.
179     This is due to the filesystem overhead present in most filesystem that
180     have a standard blocksize of four kilobytes while most digest files are under
181     one kilobyte in size, so this results in approximately a waste of three kilobytes
182     per digest file (likely even more). At the time of this writing the tree contains
183     roughly 22.000 digest files, so the overall waste caused by digest files is
184     estimated at about 70-100 megabytes.
185 genone 1.3 Furthermore it is assumed that this will also reduce the disk space wasted by
186 g2boojum 1.1 the Manifest files as they now contain more content, but this hasn't been
187     verified yet.</p>
188     <p>By unifying the digest files with the Manifest these tiny files are eliminated
189     (in the long run), reducing the apparent tree size by about 20%, benefitting
190     both users and the Gentoo infrastructure.</p>
191     </div>
192     <div class="section" id="reducing-redundancy">
193 genone 1.4 <h2><a class="toc-backref" href="#id17" name="reducing-redundancy">Reducing redundancy</a></h2>
194 g2boojum 1.1 <p>When multiple hashes are used with the current system
195     both the filename and filesize are repeated for every checksum type used as each
196     checksum is standalone. However this doesn't add any functionality and is
197     therefore useless, so the new format removes this redundancy.
198     This is a theoretical improvement at this moment as only one hash function is in
199 genone 1.4 use, but expected to change soon (see <a class="footnote-reference" href="#multi-hash-thread" id="id4" name="id4">[2]</a>).</p>
200 g2boojum 1.1 </div>
201     <div class="section" id="removal-of-checksum-collisions">
202 genone 1.4 <h2><a class="toc-backref" href="#id18" name="removal-of-checksum-collisions">Removal of checksum collisions</a></h2>
203     <p>The current system theoretically allows for a <tt class="docutils literal"><span class="pre">DIST</span></tt> type file to be recorded
204 g2boojum 1.1 in multiple digest files with different sizes and/or checksums. In such a case
205     one version of a package would report a checksum violation while another one
206     would not. This could create confusion and uncertainity among users.
207     So far this case hasn't been observed, but it can't be ruled out with the
208     existing system.
209     As the new format lists each file exactly once this would be no longer possible.</p>
210     </div>
211     <div class="section" id="flexible-verification-system">
212 genone 1.4 <h2><a class="toc-backref" href="#id19" name="flexible-verification-system">Flexible verification system</a></h2>
213 g2boojum 1.1 <p>Right now portage verifies the checksum of every file listed in the Manifest
214 genone 1.4 before using any file of the package and all <tt class="docutils literal"><span class="pre">DIST</span></tt> files of an ebuild
215 g2boojum 1.1 before using that ebuild. This is unnecessary in many cases:</p>
216     <ul class="simple">
217     <li>During the &quot;depend&quot; phase (when the ebuild metadata is generated) only
218     files of type <tt class="docutils literal"><span class="pre">EBUILD</span></tt> are used, so verifying the other types isn't
219     necessary. Theoretically it is possible for an ebuild to include other
220 genone 1.4 files like those of type <tt class="docutils literal"><span class="pre">AUX</span></tt> at this phase, but that would be a
221 g2boojum 1.1 major QA violation and should never occur, so it can be ignored here.
222     It is also not a security concern as the ebuild is verified before parsing
223     it, so each manipulation would show up.</li>
224 genone 1.4 <li>Generally files of type <tt class="docutils literal"><span class="pre">MISC</span></tt> don't need to be verified as they are
225 g2boojum 1.1 only used in very specific situations, aren't executed (just parsed at most)
226     and don't affect the package build process.</li>
227 genone 1.4 <li>Files of type <tt class="docutils literal"><span class="pre">DIST</span></tt> only need to be verified directly after fetching and
228 g2boojum 1.1 before unpacking them (which often will be one step), not every time their
229     associated ebuild is used.</li>
230     </ul>
231     </div>
232     </div>
233     <div class="section" id="backwards-compatibility">
234 genone 1.4 <h1><a class="toc-backref" href="#id20" name="backwards-compatibility">Backwards Compatibility</a></h1>
235 g2boojum 1.1 <p>Switching the Manifest system is a task that will need a long transition period
236     like most changes affecting both portage and the tree. In this case the
237     implementation will be rolled out in several phases:</p>
238     <ol class="arabic simple">
239     <li>Add support for verification of Manifest2 entries in portage</li>
240     <li>Enable generation of Manifest2 entries in addition to the current system</li>
241     <li>Ignore digests during <tt class="docutils literal"><span class="pre">emerge</span> <span class="pre">--sync</span></tt> to get the size-benefit clientside.
242     This step may be ommitted if the following steps are expected to follow soon.</li>
243     <li>Disable generation of entries for the current system</li>
244     <li>Remove all traces of the current system from the tree (serverside)</li>
245     </ol>
246     <p>Each step has its own issues. While 1) and 2) can be implemented without any
247     compability problems all later steps have a major impact:</p>
248     <ul class="simple">
249     <li>Step 3) can only be implemented when the whole tree is Manifest2 ready
250     (ideally speaking, practically the requirement will be more like 95% coverage
251     with the expectation that for the remaining 5% either bugs will be filed after
252     step 3) is completed or they'll be updated at step 5).</li>
253     <li>Steps 4) and 5) will render all portage versions without Manifest2 support
254     basically useless (users would have to regenerate the digest and Manifest
255     for each package before being able to merge it), so this requires a almost
256     100% coverage of the userbase with Manifest2 capabale portage versions
257     (with step 1) completely implemented).</li>
258     </ul>
259     <p>Another problem is that some steps affect different targets:</p>
260     <ul class="simple">
261     <li>Steps 1) and 3) target portage versions used by users</li>
262     <li>Steps 2) and 4) target portage versions used by devs</li>
263     <li>Step 5) targets the portage tree on the cvs server</li>
264     </ul>
265     <p>While it is relatively easy to get all devs to use a new portage version this is
266     practically impossible with users as some don't update their systems regulary.
267     While six months are probably sufficient to reach a 95% coverage one year is
268     estimated to reach an almost-complete coverage. All times are relative to the
269     stable-marking of a compatible portage version.</p>
270     <p>No timeframe for implementation is presented here as it is highly dependent
271     on the completion of each step.</p>
272     <p>In summary it can be said that while a full conversion will take over a year
273     to be completed due to compability issues mentioned above some benefits of the
274 genone 1.2 system can selectively be used as soon as step 2) is completed.</p>
275 g2boojum 1.1 </div>
276     <div class="section" id="other-problems">
277 genone 1.4 <h1><a class="toc-backref" href="#id21" name="other-problems">Other problems</a></h1>
278 g2boojum 1.1 <div class="section" id="impacts-on-infrastructure">
279 genone 1.4 <h2><a class="toc-backref" href="#id22" name="impacts-on-infrastructure">Impacts on infrastructure</a></h2>
280 g2boojum 1.1 <p>While one long term goal of this proposal is to reduce the size of the tree
281 genone 1.2 and therefore make life for the Gentoo Infrastructure easier this will only
282     take effect once the implementation is rolled out completely. In the meantime
283     however it will increase the tree size due to keeping checksums in both formats.
284     It's not possible to give a usable estimate on the degree of the increase as
285     it depends on many variables such as the exact implementation timeframe,
286     propagation of Manifest2 capable portage versions among devs or the update
287     rate of the tree. It has been suggested that Manifest files that are not gpg
288     signed could be mass converted in one step, this could certainly help but only
289 genone 1.4 to some degree (according to a recent research <a class="footnote-reference" href="#gpg-numbers" id="id5" name="id5">[3]</a> about 40% of
290 genone 1.2 all Manifests in the tree are signed, but this number hasn't been verified).</p>
291 g2boojum 1.1 </div>
292     </div>
293     <div class="section" id="reference-implementation">
294 genone 1.4 <h1><a class="toc-backref" href="#id23" name="reference-implementation">Reference Implementation</a></h1>
295 g2boojum 1.1 <p>A patch for a prototype implementation of Manifest2 verification and partial
296 genone 1.4 generation has been posted at <a class="footnote-reference" href="#manifest2-patch" id="id6" name="id6">[4]</a>, it will be reworked before
297 g2boojum 1.1 being considered for inclusion in portage. However it shows that adding support
298     for verification is quite simple, but generation is a bit tricky and will
299     therefore be implemented later.</p>
300     </div>
301     <div class="section" id="options">
302 genone 1.4 <h1><a class="toc-backref" href="#id24" name="options">Options</a></h1>
303 g2boojum 1.1 <p>Some things have been considered for this GLEP but aren't part of the proposal
304     yet for various reasons:</p>
305     <ul class="simple">
306     <li>timestamp field: the author has considered adding a timestamp field for
307     each entry to list the time the entry was created. However so far no practical
308     use for such a feature has been found.</li>
309     <li>convert size field into checksum: Another idea was to treat the size field
310     like any other checksum. But so far no real benefit (other than a slightly
311     more modular implementation) for this has been seen while it has several
312     drawbacks: For once, unlike checksums, the size field is definitely required
313 genone 1.4 for all <tt class="docutils literal"><span class="pre">DIST</span></tt> files, also it would slightly increase the length of
314 g2boojum 1.1 each entry by adding a <tt class="docutils literal"><span class="pre">SIZE</span></tt> keyword.</li>
315 genone 1.4 <li>removal of the <tt class="docutils literal"><span class="pre">MISC</span></tt> type: It has been suggested to completely drop
316     entries of type <tt class="docutils literal"><span class="pre">MISC</span></tt>. This would result in a minor space reduction
317 g2boojum 1.1 (its rather unlikely to free any blocks) but completely remove the ability
318     to check these files for integrity. While they don't influence portage
319     or packages directly they can contain viable information for users, so
320     the author has the opinion that at least the option for integrity checks
321     should be kept.</li>
322     </ul>
323     </div>
324     <div class="section" id="credits">
325 genone 1.4 <h1><a class="toc-backref" href="#id25" name="credits">Credits</a></h1>
326 g2boojum 1.1 <p>Thanks to the following persons for their input on or related to this GLEP
327     (even though they might not have known it):
328     Ned Ludd (solar), Brian Harring (ferringb), Jason Stubbs (jstubbs),
329     Robin H. Johnson (robbat2), Aron Griffis (agriffis)</p>
330     <p>Also thanks to Nicholas Jones (carpaski) to make the current Manifest system
331     resistent enough to be able to handle this change without too many transition
332     problems.</p>
333     </div>
334     <div class="section" id="references">
335 genone 1.4 <h1><a class="toc-backref" href="#id26" name="references">References</a></h1>
336 g2boojum 1.1 <table class="docutils footnote" frame="void" id="reorg-thread" rules="none">
337     <colgroup><col class="label" /><col /></colgroup>
338     <tbody valign="top">
339     <tr><td class="label"><a class="fn-backref" href="#id1" name="reorg-thread">[1]</a></td><td><a class="reference" href="http://thread.gmane.org/gmane.linux.gentoo.devel/21920">http://thread.gmane.org/gmane.linux.gentoo.devel/21920</a></td></tr>
340     </tbody>
341     </table>
342     <table class="docutils footnote" frame="void" id="multi-hash-thread" rules="none">
343     <colgroup><col class="label" /><col /></colgroup>
344     <tbody valign="top">
345 genone 1.4 <tr><td class="label"><a name="multi-hash-thread">[2]</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://thread.gmane.org/gmane.linux.gentoo.devel/33434">http://thread.gmane.org/gmane.linux.gentoo.devel/33434</a></td></tr>
346 g2boojum 1.1 </tbody>
347     </table>
348     <table class="docutils footnote" frame="void" id="gpg-numbers" rules="none">
349     <colgroup><col class="label" /><col /></colgroup>
350     <tbody valign="top">
351 genone 1.4 <tr><td class="label"><a class="fn-backref" href="#id5" name="gpg-numbers">[3]</a></td><td>gentoo-core mailing list, topic &quot;Gentoo key signing practices
352 g2boojum 1.1 and official Gentoo keyring&quot;, Message-ID &lt;<a class="reference" href="mailto:20051117075838.GB15734&#64;curie-int.vc.shawcable.net">20051117075838.GB15734&#64;curie-int.vc.shawcable.net</a>&gt;</td></tr>
353     </tbody>
354     </table>
355     <table class="docutils footnote" frame="void" id="manifest2-patch" rules="none">
356     <colgroup><col class="label" /><col /></colgroup>
357     <tbody valign="top">
358 genone 1.4 <tr><td class="label"><a class="fn-backref" href="#id6" name="manifest2-patch">[4]</a></td><td><a class="reference" href="http://thread.gmane.org/gmane.linux.gentoo.portage.devel/1374">http://thread.gmane.org/gmane.linux.gentoo.portage.devel/1374</a></td></tr>
359     </tbody>
360     </table>
361     <table class="docutils footnote" frame="void" id="manifest2-example" rules="none">
362     <colgroup><col class="label" /><col /></colgroup>
363     <tbody valign="top">
364     <tr><td class="label"><a name="manifest2-example">[5]</a></td><td><a class="reference" href="http://www.gentoo.org/proj/en/glep/glep-0044-extras/manifest2-example">http://www.gentoo.org/proj/en/glep/glep-0044-extras/manifest2-example</a></td></tr>
365     </tbody>
366     </table>
367     <table class="docutils footnote" frame="void" id="id7" rules="none">
368     <colgroup><col class="label" /><col /></colgroup>
369     <tbody valign="top">
370     <tr><td class="label"><a class="fn-backref" href="#id8" name="id7">[6]</a></td><td><a class="reference" href="glep-0044-extras/manifest2-example">glep-0044-extras/manifest2-example</a></td></tr>
371 g2boojum 1.1 </tbody>
372     </table>
373     </div>
374     <div class="section" id="copyright">
375 genone 1.4 <h1><a class="toc-backref" href="#id27" name="copyright">Copyright</a></h1>
376 g2boojum 1.1 <p>This document has been placed in the public domain.</p>
377     </div>
378    
379     </div>
380     <div class="footer">
381     <hr class="footer" />
382     <a class="reference" href="glep-0044.txt">View document source</a>.
383 genone 1.4 Generated on: 2006-02-10 23:25 UTC.
384 g2boojum 1.1 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.
385    
386     </div>
387     </body>
388     </html>

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