1 |
g2boojum |
1.1 |
<?xml version="1.0" encoding="utf-8" ?> |
2 |
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
3 |
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
4 |
|
|
<!-- |
5 |
|
|
This HTML is auto-generated. DO NOT EDIT THIS FILE! If you are writing a new |
6 |
|
|
PEP, see http://www.python.org/peps/pep-0001.html for instructions and links |
7 |
|
|
to templates. DO NOT USE THIS HTML FILE AS YOUR TEMPLATE! |
8 |
|
|
--> |
9 |
|
|
<head> |
10 |
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
11 |
|
|
<meta name="generator" content="Docutils 0.3.9: http://docutils.sourceforge.net/" /> |
12 |
|
|
<title>GLEP 44 -- Manifest2 format</title> |
13 |
|
|
<link rel="stylesheet" href="tools/glep.css" type="text/css" /> |
14 |
|
|
</head> |
15 |
|
|
<body bgcolor="white"> |
16 |
|
|
<table class="navigation" cellpadding="0" cellspacing="0" |
17 |
|
|
width="100%" border="0"> |
18 |
|
|
<tr><td class="navicon" width="150" height="35"> |
19 |
|
|
<a href="http://www.gentoo.org/" title="Gentoo Linux Home Page"> |
20 |
|
|
<img src="http://www.gentoo.org/images/gentoo-new.gif" alt="[Gentoo]" |
21 |
|
|
border="0" width="150" height="35" /></a></td> |
22 |
|
|
<td class="textlinks" align="left"> |
23 |
|
|
[<b><a href="http://www.gentoo.org/">Gentoo Linux Home</a></b>] |
24 |
|
|
[<b><a href="http://www.gentoo.org/proj/en/glep">GLEP Index</a></b>] |
25 |
|
|
[<b><a href="./glep-0044.txt">GLEP Source</a></b>] |
26 |
|
|
</td></tr></table> |
27 |
|
|
<table class="rfc2822 docutils field-list" frame="void" rules="none"> |
28 |
|
|
<col class="field-name" /> |
29 |
|
|
<col class="field-body" /> |
30 |
|
|
<tbody valign="top"> |
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 |
1.3 |
<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.2</td> |
36 |
g2boojum |
1.1 |
</tr> |
37 |
genone |
1.3 |
<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">2005/12/06 16:19:37</a></td> |
38 |
g2boojum |
1.1 |
</tr> |
39 |
|
|
<tr class="field"><th class="field-name">Author:</th><td class="field-body">Marius Mauch <genone at gentoo.org>,</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 |
|
|
<li><a class="reference" href="#abstract" id="id6" name="id6">Abstract</a></li> |
58 |
|
|
<li><a class="reference" href="#motivation" id="id7" name="id7">Motivation</a></li> |
59 |
|
|
<li><a class="reference" href="#specification" id="id8" name="id8">Specification</a><ul> |
60 |
|
|
<li><a class="reference" href="#compability-entries" id="id9" name="id9">Compability Entries</a></li> |
61 |
|
|
<li><a class="reference" href="#scope" id="id10" name="id10">Scope</a></li> |
62 |
|
|
</ul> |
63 |
|
|
</li> |
64 |
|
|
<li><a class="reference" href="#rationale" id="id11" name="id11">Rationale</a><ul> |
65 |
|
|
<li><a class="reference" href="#removal-of-digest-files" id="id12" name="id12">Removal of digest files</a></li> |
66 |
|
|
<li><a class="reference" href="#reducing-redundancy" id="id13" name="id13">Reducing redundancy</a></li> |
67 |
|
|
<li><a class="reference" href="#removal-of-checksum-collisions" id="id14" name="id14">Removal of checksum collisions</a></li> |
68 |
|
|
<li><a class="reference" href="#flexible-verification-system" id="id15" name="id15">Flexible verification system</a></li> |
69 |
|
|
</ul> |
70 |
|
|
</li> |
71 |
|
|
<li><a class="reference" href="#backwards-compatibility" id="id16" name="id16">Backwards Compatibility</a></li> |
72 |
|
|
<li><a class="reference" href="#other-problems" id="id17" name="id17">Other problems</a><ul> |
73 |
|
|
<li><a class="reference" href="#impacts-on-infrastructure" id="id18" name="id18">Impacts on infrastructure</a></li> |
74 |
|
|
</ul> |
75 |
|
|
</li> |
76 |
|
|
<li><a class="reference" href="#reference-implementation" id="id19" name="id19">Reference Implementation</a></li> |
77 |
|
|
<li><a class="reference" href="#options" id="id20" name="id20">Options</a></li> |
78 |
|
|
<li><a class="reference" href="#credits" id="id21" name="id21">Credits</a></li> |
79 |
|
|
<li><a class="reference" href="#references" id="id22" name="id22">References</a></li> |
80 |
|
|
<li><a class="reference" href="#copyright" id="id23" name="id23">Copyright</a></li> |
81 |
|
|
</ul> |
82 |
|
|
</div> |
83 |
|
|
<div class="section" id="abstract"> |
84 |
|
|
<h1><a class="toc-backref" href="#id6" name="abstract">Abstract</a></h1> |
85 |
|
|
<p>This GLEP proposes a new format for the Portage Manifest and digest file system |
86 |
|
|
by unifying both filetypes into one to improve functional and non-functional |
87 |
|
|
aspects of the Portage Tree.</p> |
88 |
|
|
</div> |
89 |
|
|
<div class="section" id="motivation"> |
90 |
|
|
<h1><a class="toc-backref" href="#id7" name="motivation">Motivation</a></h1> |
91 |
|
|
<p>Please see <a class="footnote-reference" href="#reorg-thread" id="id1" name="id1">[1]</a> for a general overview. |
92 |
|
|
The main long term goals of this proposal are to:</p> |
93 |
|
|
<ul class="simple"> |
94 |
|
|
<li>Remove the tiny digest files from the tree. They are a major annoyance as on a |
95 |
genone |
1.3 |
typical configuration they waste a lot of disk space and the simple transmission |
96 |
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 |
97 |
|
|
amount of bandwidth.</li> |
98 |
|
|
<li>Reduce redundancy when multiple hash functions are used</li> |
99 |
|
|
<li>Remove potential for checksum collisions if a file is recorded in more than one |
100 |
|
|
digest file</li> |
101 |
|
|
<li>Difference between filetypes for a more flexible verification system</li> |
102 |
|
|
</ul> |
103 |
|
|
</div> |
104 |
|
|
<div class="section" id="specification"> |
105 |
|
|
<h1><a class="toc-backref" href="#id8" name="specification">Specification</a></h1> |
106 |
|
|
<p>The new Manifest format would change the existing format in the following ways:</p> |
107 |
|
|
<ul> |
108 |
|
|
<li><p class="first">Addition of a filetype specifier, currently planned are</p> |
109 |
|
|
<ul class="simple"> |
110 |
|
|
<li><tt class="docutils literal"><span class="pre">AUXFILE</span></tt> for files directly used by ebuilds (e.g. patches or initscripts), |
111 |
|
|
located in the <tt class="docutils literal"><span class="pre">files/</span></tt> subdirectory</li> |
112 |
|
|
<li><tt class="docutils literal"><span class="pre">EBUILD</span></tt> for all ebuilds</li> |
113 |
|
|
<li><tt class="docutils literal"><span class="pre">MISCFILE</span></tt> for files not directly used by ebuilds like <tt class="docutils literal"><span class="pre">ChangeLog</span></tt> or |
114 |
|
|
<tt class="docutils literal"><span class="pre">metadata.xml</span></tt> files</li> |
115 |
genone |
1.3 |
<li><tt class="docutils literal"><span class="pre">DISTFILE</span></tt> for release tarballs recorded in the <tt class="docutils literal"><span class="pre">SRC_URI</span></tt> variable of an ebuild, |
116 |
g2boojum |
1.1 |
these were previously recorded in the digest files</li> |
117 |
|
|
</ul> |
118 |
|
|
<p>Future portage improvements might extend this list (for example with types |
119 |
|
|
relevant for eclasses or profiles)</p> |
120 |
|
|
</li> |
121 |
|
|
<li><p class="first">Only have one line per file listing all information instead of one line per |
122 |
|
|
file and checksum type</p> |
123 |
|
|
</li> |
124 |
|
|
<li><p class="first">Remove the separated digest-* files in the <tt class="docutils literal"><span class="pre">files/</span></tt> subdirectory</p> |
125 |
|
|
</li> |
126 |
|
|
</ul> |
127 |
|
|
<p>Each line in the new format has the following format:</p> |
128 |
|
|
<pre class="literal-block"> |
129 |
|
|
<filetype> <filename> <filesize> <chksumtype1> <chksum1> ... <chksumtypen> <chksumn> |
130 |
|
|
</pre> |
131 |
|
|
<p>However theses entries will be stored in the existing Manifest files.</p> |
132 |
|
|
<p>An actual example for a (pure) Manifest2 file could look like this (using |
133 |
|
|
indentation to indicate line continuation):</p> |
134 |
|
|
<pre class="literal-block"> |
135 |
|
|
AUXFILE ldif-buffer-overflow-fix.diff 5007 RMD160 1354a6bd2687430b628b78aaf43f5c793d2f0704 |
136 |
|
|
SHA1 424e1dfca06488f605b9611160020227ecdd03ac MD5 06d23c04b3d6ddfb1431c22ecc5b28f6 |
137 |
|
|
AUXFILE procmime.patch 977 RMD160 39a51a4d654759b15d1644a79fb6e8921130df3c |
138 |
|
|
SHA1 d76929f6dfc2179281f7ccee5789aab4e970ba9e MD5 bf4c9cd9cb7cdc6ece7d4d327910f0cf |
139 |
|
|
EBUILD sylpheed-claws-1.0.5-r1.ebuild 3906 RMD160 cdd546c128db2dea7044437de01ec96e12b4f5bf |
140 |
|
|
SHA1 a84b49e76961d7a9100852b64c2bfbf9b053d45e MD5 b9fe79135a475458ef1b2240ee302ebd |
141 |
|
|
EBUILD sylpheed-claws-1.9.100.ebuild 4444 RMD160 89326038bfc694dafd22f10400a08d3f930fb2bd |
142 |
|
|
SHA1 8895342f3f0cc6fcbdd0fdada2ad8e23ce539d23 MD5 0643de736b42d8c0e1673e86ae0b7f80 |
143 |
|
|
EBUILD sylpheed-claws-1.9.15.ebuild 4821 RMD160 ec0ff811b893084459fe5b17b8ba8d6b35a55687 |
144 |
|
|
SHA1 358278a43da244e1f4803ec4b04d6fa45c41ab4d MD5 15b5c9348ba0b0a416892588256b4cbc |
145 |
|
|
MISCFILE ChangeLog 25770 RMD160 0e69dd7425add1560d630dd3367342418e9be776 |
146 |
|
|
SHA1 1210160f7baf0319de3b1b58dc80d7680d316d28 MD5 732cdc3b41403a115970d497a9ec257e |
147 |
|
|
MISCFILE metadata.xml 269 RMD160 39d775de55f9963f8946feaf088aa0324770bacb |
148 |
|
|
SHA1 4fd7b285049d0e587f89e86becf06c0fd77bae6d MD5 82e806ed62f0596fb7bef493d225712f |
149 |
genone |
1.3 |
DISTFILE sylpheed-claws-1.0.5.tar.bz2 3268626 RMD160 f2708b5d69bc9a5025812511fde04eca7782e367 |
150 |
g2boojum |
1.1 |
SHA1 d351d7043eef7a875df18a8c4b9464be49e2164b MD5 ef4a1a7beb407dc7c31b4799bc48f12e |
151 |
genone |
1.3 |
DISTFILE sylpheed-claws-1.9.100.tar.bz2 3480063 RMD160 72fbcbcc05d966f34897efcc1c96377420dc5544 |
152 |
g2boojum |
1.1 |
SHA1 47465662b5470af5711493ce4eaad764c5bf02ca MD5 863c314557f90f17c2f6d6a0ab57e6c2 |
153 |
genone |
1.3 |
DISTFILE sylpheed-claws-1.9.15.tar.bz2 3481018 RMD160 b01d1af2df55806a8a8275102b10e389e0d98e94 |
154 |
g2boojum |
1.1 |
SHA1 a17fc64b8dcc5b56432e5beb5c826913cb3ad79e MD5 0d187526e0eca23b87ffa4981f7e1765 |
155 |
|
|
</pre> |
156 |
|
|
<div class="section" id="compability-entries"> |
157 |
|
|
<h2><a class="toc-backref" href="#id9" name="compability-entries">Compability Entries</a></h2> |
158 |
|
|
<p>To maintain compability with existing portage versions a transition period after |
159 |
|
|
is the introduction of the Manifest2 format is required during which portage |
160 |
|
|
will not only have to be capable of using existing Manifest and digest files but |
161 |
|
|
also generate them in addition to the new entries. |
162 |
|
|
Fortunately this can be accomplished by simply mixing old and new style entries |
163 |
|
|
in one file for the Manifest files, existing portage versions will simply ignore |
164 |
|
|
the new style entries. For the digest files there are no new entries to care |
165 |
|
|
about.</p> |
166 |
|
|
</div> |
167 |
|
|
<div class="section" id="scope"> |
168 |
|
|
<h2><a class="toc-backref" href="#id10" name="scope">Scope</a></h2> |
169 |
|
|
<p>It is important to note that this proposal only deals with a change of the |
170 |
|
|
format of the digest and Manifest system.</p> |
171 |
|
|
<p>It does not expand the scope of it to cover eclasses, profiles or anything |
172 |
|
|
else not already covered by the Manifest system, it also doesn't affect |
173 |
|
|
the Manifest signing efforts in any way (though the implementations of both |
174 |
|
|
might be coupled).</p> |
175 |
|
|
<p>Also while multiple hash functions will become standard with the proposed |
176 |
|
|
implementation they are not a specific feature of this format <a class="footnote-reference" href="#multi-hash-thread" id="id2" name="id2">[2]</a>.</p> |
177 |
|
|
</div> |
178 |
|
|
</div> |
179 |
|
|
<div class="section" id="rationale"> |
180 |
|
|
<h1><a class="toc-backref" href="#id11" name="rationale">Rationale</a></h1> |
181 |
|
|
<p>The main goals of the proposal have been listed in the <a class="reference" href="#motivation">Motivation</a>, here now |
182 |
|
|
the explanation why they are improvements and how the proposed format will |
183 |
|
|
accomplish them.</p> |
184 |
|
|
<div class="section" id="removal-of-digest-files"> |
185 |
|
|
<h2><a class="toc-backref" href="#id12" name="removal-of-digest-files">Removal of digest files</a></h2> |
186 |
|
|
<p>Normal users that don't use a "tuned" filesystem for the portage tree are |
187 |
genone |
1.3 |
wasting several dozen to a few hundred megabytes of disk space with the current |
188 |
g2boojum |
1.1 |
system, largely caused by the digest files. |
189 |
|
|
This is due to the filesystem overhead present in most filesystem that |
190 |
|
|
have a standard blocksize of four kilobytes while most digest files are under |
191 |
|
|
one kilobyte in size, so this results in approximately a waste of three kilobytes |
192 |
|
|
per digest file (likely even more). At the time of this writing the tree contains |
193 |
|
|
roughly 22.000 digest files, so the overall waste caused by digest files is |
194 |
|
|
estimated at about 70-100 megabytes. |
195 |
genone |
1.3 |
Furthermore it is assumed that this will also reduce the disk space wasted by |
196 |
g2boojum |
1.1 |
the Manifest files as they now contain more content, but this hasn't been |
197 |
|
|
verified yet.</p> |
198 |
|
|
<p>By unifying the digest files with the Manifest these tiny files are eliminated |
199 |
|
|
(in the long run), reducing the apparent tree size by about 20%, benefitting |
200 |
|
|
both users and the Gentoo infrastructure.</p> |
201 |
|
|
</div> |
202 |
|
|
<div class="section" id="reducing-redundancy"> |
203 |
|
|
<h2><a class="toc-backref" href="#id13" name="reducing-redundancy">Reducing redundancy</a></h2> |
204 |
|
|
<p>When multiple hashes are used with the current system |
205 |
|
|
both the filename and filesize are repeated for every checksum type used as each |
206 |
|
|
checksum is standalone. However this doesn't add any functionality and is |
207 |
|
|
therefore useless, so the new format removes this redundancy. |
208 |
|
|
This is a theoretical improvement at this moment as only one hash function is in |
209 |
|
|
use, but expected to change soon (see <a class="footnote-reference" href="#multi-hash-thread" id="id3" name="id3">[2]</a>).</p> |
210 |
|
|
</div> |
211 |
|
|
<div class="section" id="removal-of-checksum-collisions"> |
212 |
|
|
<h2><a class="toc-backref" href="#id14" name="removal-of-checksum-collisions">Removal of checksum collisions</a></h2> |
213 |
genone |
1.3 |
<p>The current system theoretically allows for a <tt class="docutils literal"><span class="pre">DISTFILE</span></tt> type file to be recorded |
214 |
g2boojum |
1.1 |
in multiple digest files with different sizes and/or checksums. In such a case |
215 |
|
|
one version of a package would report a checksum violation while another one |
216 |
|
|
would not. This could create confusion and uncertainity among users. |
217 |
|
|
So far this case hasn't been observed, but it can't be ruled out with the |
218 |
|
|
existing system. |
219 |
|
|
As the new format lists each file exactly once this would be no longer possible.</p> |
220 |
|
|
</div> |
221 |
|
|
<div class="section" id="flexible-verification-system"> |
222 |
|
|
<h2><a class="toc-backref" href="#id15" name="flexible-verification-system">Flexible verification system</a></h2> |
223 |
|
|
<p>Right now portage verifies the checksum of every file listed in the Manifest |
224 |
genone |
1.3 |
before using any file of the package and all <tt class="docutils literal"><span class="pre">DISTFILE</span></tt> files of an ebuild |
225 |
g2boojum |
1.1 |
before using that ebuild. This is unnecessary in many cases:</p> |
226 |
|
|
<ul class="simple"> |
227 |
|
|
<li>During the "depend" phase (when the ebuild metadata is generated) only |
228 |
|
|
files of type <tt class="docutils literal"><span class="pre">EBUILD</span></tt> are used, so verifying the other types isn't |
229 |
|
|
necessary. Theoretically it is possible for an ebuild to include other |
230 |
|
|
files like those of type <tt class="docutils literal"><span class="pre">AUXFILE</span></tt> at this phase, but that would be a |
231 |
|
|
major QA violation and should never occur, so it can be ignored here. |
232 |
|
|
It is also not a security concern as the ebuild is verified before parsing |
233 |
|
|
it, so each manipulation would show up.</li> |
234 |
|
|
<li>Generally files of type <tt class="docutils literal"><span class="pre">MISCFILE</span></tt> don't need to be verified as they are |
235 |
|
|
only used in very specific situations, aren't executed (just parsed at most) |
236 |
|
|
and don't affect the package build process.</li> |
237 |
genone |
1.3 |
<li>Files of type <tt class="docutils literal"><span class="pre">DISTFILE</span></tt> only need to be verified directly after fetching and |
238 |
g2boojum |
1.1 |
before unpacking them (which often will be one step), not every time their |
239 |
|
|
associated ebuild is used.</li> |
240 |
|
|
</ul> |
241 |
|
|
</div> |
242 |
|
|
</div> |
243 |
|
|
<div class="section" id="backwards-compatibility"> |
244 |
|
|
<h1><a class="toc-backref" href="#id16" name="backwards-compatibility">Backwards Compatibility</a></h1> |
245 |
|
|
<p>Switching the Manifest system is a task that will need a long transition period |
246 |
|
|
like most changes affecting both portage and the tree. In this case the |
247 |
|
|
implementation will be rolled out in several phases:</p> |
248 |
|
|
<ol class="arabic simple"> |
249 |
|
|
<li>Add support for verification of Manifest2 entries in portage</li> |
250 |
|
|
<li>Enable generation of Manifest2 entries in addition to the current system</li> |
251 |
|
|
<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. |
252 |
|
|
This step may be ommitted if the following steps are expected to follow soon.</li> |
253 |
|
|
<li>Disable generation of entries for the current system</li> |
254 |
|
|
<li>Remove all traces of the current system from the tree (serverside)</li> |
255 |
|
|
</ol> |
256 |
|
|
<p>Each step has its own issues. While 1) and 2) can be implemented without any |
257 |
|
|
compability problems all later steps have a major impact:</p> |
258 |
|
|
<ul class="simple"> |
259 |
|
|
<li>Step 3) can only be implemented when the whole tree is Manifest2 ready |
260 |
|
|
(ideally speaking, practically the requirement will be more like 95% coverage |
261 |
|
|
with the expectation that for the remaining 5% either bugs will be filed after |
262 |
|
|
step 3) is completed or they'll be updated at step 5).</li> |
263 |
|
|
<li>Steps 4) and 5) will render all portage versions without Manifest2 support |
264 |
|
|
basically useless (users would have to regenerate the digest and Manifest |
265 |
|
|
for each package before being able to merge it), so this requires a almost |
266 |
|
|
100% coverage of the userbase with Manifest2 capabale portage versions |
267 |
|
|
(with step 1) completely implemented).</li> |
268 |
|
|
</ul> |
269 |
|
|
<p>Another problem is that some steps affect different targets:</p> |
270 |
|
|
<ul class="simple"> |
271 |
|
|
<li>Steps 1) and 3) target portage versions used by users</li> |
272 |
|
|
<li>Steps 2) and 4) target portage versions used by devs</li> |
273 |
|
|
<li>Step 5) targets the portage tree on the cvs server</li> |
274 |
|
|
</ul> |
275 |
|
|
<p>While it is relatively easy to get all devs to use a new portage version this is |
276 |
|
|
practically impossible with users as some don't update their systems regulary. |
277 |
|
|
While six months are probably sufficient to reach a 95% coverage one year is |
278 |
|
|
estimated to reach an almost-complete coverage. All times are relative to the |
279 |
|
|
stable-marking of a compatible portage version.</p> |
280 |
|
|
<p>No timeframe for implementation is presented here as it is highly dependent |
281 |
|
|
on the completion of each step.</p> |
282 |
|
|
<p>In summary it can be said that while a full conversion will take over a year |
283 |
|
|
to be completed due to compability issues mentioned above some benefits of the |
284 |
genone |
1.2 |
system can selectively be used as soon as step 2) is completed.</p> |
285 |
g2boojum |
1.1 |
</div> |
286 |
|
|
<div class="section" id="other-problems"> |
287 |
|
|
<h1><a class="toc-backref" href="#id17" name="other-problems">Other problems</a></h1> |
288 |
|
|
<div class="section" id="impacts-on-infrastructure"> |
289 |
|
|
<h2><a class="toc-backref" href="#id18" name="impacts-on-infrastructure">Impacts on infrastructure</a></h2> |
290 |
|
|
<p>While one long term goal of this proposal is to reduce the size of the tree |
291 |
genone |
1.2 |
and therefore make life for the Gentoo Infrastructure easier this will only |
292 |
|
|
take effect once the implementation is rolled out completely. In the meantime |
293 |
|
|
however it will increase the tree size due to keeping checksums in both formats. |
294 |
|
|
It's not possible to give a usable estimate on the degree of the increase as |
295 |
|
|
it depends on many variables such as the exact implementation timeframe, |
296 |
|
|
propagation of Manifest2 capable portage versions among devs or the update |
297 |
|
|
rate of the tree. It has been suggested that Manifest files that are not gpg |
298 |
|
|
signed could be mass converted in one step, this could certainly help but only |
299 |
|
|
to some degree (according to a recent research <a class="footnote-reference" href="#gpg-numbers" id="id4" name="id4">[3]</a> about 40% of |
300 |
|
|
all Manifests in the tree are signed, but this number hasn't been verified).</p> |
301 |
g2boojum |
1.1 |
</div> |
302 |
|
|
</div> |
303 |
|
|
<div class="section" id="reference-implementation"> |
304 |
|
|
<h1><a class="toc-backref" href="#id19" name="reference-implementation">Reference Implementation</a></h1> |
305 |
|
|
<p>A patch for a prototype implementation of Manifest2 verification and partial |
306 |
|
|
generation has been posted at <a class="footnote-reference" href="#manifest2-patch" id="id5" name="id5">[4]</a>, it will be reworked before |
307 |
|
|
being considered for inclusion in portage. However it shows that adding support |
308 |
|
|
for verification is quite simple, but generation is a bit tricky and will |
309 |
|
|
therefore be implemented later.</p> |
310 |
|
|
</div> |
311 |
|
|
<div class="section" id="options"> |
312 |
|
|
<h1><a class="toc-backref" href="#id20" name="options">Options</a></h1> |
313 |
|
|
<p>Some things have been considered for this GLEP but aren't part of the proposal |
314 |
|
|
yet for various reasons:</p> |
315 |
|
|
<ul class="simple"> |
316 |
|
|
<li>timestamp field: the author has considered adding a timestamp field for |
317 |
|
|
each entry to list the time the entry was created. However so far no practical |
318 |
|
|
use for such a feature has been found.</li> |
319 |
|
|
<li>convert size field into checksum: Another idea was to treat the size field |
320 |
|
|
like any other checksum. But so far no real benefit (other than a slightly |
321 |
|
|
more modular implementation) for this has been seen while it has several |
322 |
|
|
drawbacks: For once, unlike checksums, the size field is definitely required |
323 |
genone |
1.3 |
for all <tt class="docutils literal"><span class="pre">DISTFILE</span></tt> files, also it would slightly increase the length of |
324 |
g2boojum |
1.1 |
each entry by adding a <tt class="docutils literal"><span class="pre">SIZE</span></tt> keyword.</li> |
325 |
|
|
<li>removal of the <tt class="docutils literal"><span class="pre">MISCFILE</span></tt> type: It has been suggested to completely drop |
326 |
|
|
entries of type <tt class="docutils literal"><span class="pre">MISCFILE</span></tt>. This would result in a minor space reduction |
327 |
|
|
(its rather unlikely to free any blocks) but completely remove the ability |
328 |
|
|
to check these files for integrity. While they don't influence portage |
329 |
|
|
or packages directly they can contain viable information for users, so |
330 |
|
|
the author has the opinion that at least the option for integrity checks |
331 |
|
|
should be kept.</li> |
332 |
|
|
</ul> |
333 |
|
|
</div> |
334 |
|
|
<div class="section" id="credits"> |
335 |
|
|
<h1><a class="toc-backref" href="#id21" name="credits">Credits</a></h1> |
336 |
|
|
<p>Thanks to the following persons for their input on or related to this GLEP |
337 |
|
|
(even though they might not have known it): |
338 |
|
|
Ned Ludd (solar), Brian Harring (ferringb), Jason Stubbs (jstubbs), |
339 |
|
|
Robin H. Johnson (robbat2), Aron Griffis (agriffis)</p> |
340 |
|
|
<p>Also thanks to Nicholas Jones (carpaski) to make the current Manifest system |
341 |
|
|
resistent enough to be able to handle this change without too many transition |
342 |
|
|
problems.</p> |
343 |
|
|
</div> |
344 |
|
|
<div class="section" id="references"> |
345 |
|
|
<h1><a class="toc-backref" href="#id22" name="references">References</a></h1> |
346 |
|
|
<table class="docutils footnote" frame="void" id="reorg-thread" rules="none"> |
347 |
|
|
<colgroup><col class="label" /><col /></colgroup> |
348 |
|
|
<tbody valign="top"> |
349 |
|
|
<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> |
350 |
|
|
</tbody> |
351 |
|
|
</table> |
352 |
|
|
<table class="docutils footnote" frame="void" id="multi-hash-thread" rules="none"> |
353 |
|
|
<colgroup><col class="label" /><col /></colgroup> |
354 |
|
|
<tbody valign="top"> |
355 |
|
|
<tr><td class="label"><a name="multi-hash-thread">[2]</a></td><td><em>(<a class="fn-backref" href="#id2">1</a>, <a class="fn-backref" href="#id3">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> |
356 |
|
|
</tbody> |
357 |
|
|
</table> |
358 |
|
|
<table class="docutils footnote" frame="void" id="gpg-numbers" rules="none"> |
359 |
|
|
<colgroup><col class="label" /><col /></colgroup> |
360 |
|
|
<tbody valign="top"> |
361 |
|
|
<tr><td class="label"><a class="fn-backref" href="#id4" name="gpg-numbers">[3]</a></td><td>gentoo-core mailing list, topic "Gentoo key signing practices |
362 |
|
|
and official Gentoo keyring", Message-ID <<a class="reference" href="mailto:20051117075838.GB15734@curie-int.vc.shawcable.net">20051117075838.GB15734@curie-int.vc.shawcable.net</a>></td></tr> |
363 |
|
|
</tbody> |
364 |
|
|
</table> |
365 |
|
|
<table class="docutils footnote" frame="void" id="manifest2-patch" rules="none"> |
366 |
|
|
<colgroup><col class="label" /><col /></colgroup> |
367 |
|
|
<tbody valign="top"> |
368 |
|
|
<tr><td class="label"><a class="fn-backref" href="#id5" 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> |
369 |
|
|
</tbody> |
370 |
|
|
</table> |
371 |
|
|
</div> |
372 |
|
|
<div class="section" id="copyright"> |
373 |
|
|
<h1><a class="toc-backref" href="#id23" name="copyright">Copyright</a></h1> |
374 |
|
|
<p>This document has been placed in the public domain.</p> |
375 |
|
|
</div> |
376 |
|
|
|
377 |
|
|
</div> |
378 |
|
|
<div class="footer"> |
379 |
|
|
<hr class="footer" /> |
380 |
|
|
<a class="reference" href="glep-0044.txt">View document source</a>. |
381 |
genone |
1.3 |
Generated on: 2006-01-23 10:22 UTC. |
382 |
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. |
383 |
|
|
|
384 |
|
|
</div> |
385 |
|
|
</body> |
386 |
|
|
</html> |
387 |
|
|
|