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31<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">33</td> 274<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">33</td>
32</tr> 275</tr>
33<tr class="field"><th class="field-name">Title:</th><td class="field-body">Eclass Restructure/Redesign</td> 276<tr class="field"><th class="field-name">Title:</th><td class="field-body">Eclass Restructure/Redesign</td>
34</tr> 277</tr>
35<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.3</td> 278<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.6</td>
36</tr> 279</tr>
37<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-0033.txt?cvsroot=gentoo">2005/03/06 20:39:19</a></td> 280<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.cgi/xml/htdocs/proj/en/glep/glep-0033.txt?cvsroot=gentoo">2006/09/05 20:54:30</a></td>
38</tr> 281</tr>
39<tr class="field"><th class="field-name">Author:</th><td class="field-body">Brian Harring &lt;ferringb&#32;&#97;t&#32;gentoo.org&gt;, John Mylchreest &lt;johnm&#32;&#97;t&#32;gentoo.org&gt;</td> 282<tr class="field"><th class="field-name">Author:</th><td class="field-body">Brian Harring &lt;ferringb&#32;&#97;t&#32;gentoo.org&gt;, John Mylchreest &lt;johnm&#32;&#97;t&#32;gentoo.org&gt;</td>
40</tr> 283</tr>
41<tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td> 284<tr class="field"><th class="field-name">Status:</th><td class="field-body">Moribund</td>
42</tr> 285</tr>
43<tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td> 286<tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
44</tr> 287</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> 288<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>
46</tr> 289</tr>
47<tr class="field"><th class="field-name">Created:</th><td class="field-body">29-Jan-2005</td> 290<tr class="field"><th class="field-name">Created:</th><td class="field-body">29-Jan-2005</td>
48</tr> 291</tr>
49<tr class="field"><th class="field-name">Post-History:</th><td class="field-body">29-Jan-2005 6-Mar-2005</td> 292<tr class="field"><th class="field-name">Post-History:</th><td class="field-body">29-Jan-2005 6-Mar-2005 15-Sep-2005 5-Sep-2006</td>
50</tr> 293</tr>
51</tbody> 294</tbody>
52</table> 295</table>
53<hr /> 296<hr />
54<div class="contents topic" id="contents"> 297<div class="contents topic">
55<p class="topic-title first"><a name="contents">Contents</a></p> 298<p class="topic-title first"><a id="contents" name="contents">Contents</a></p>
56<ul class="simple"> 299<ul class="simple">
300<li><a class="reference" href="#status" id="id2" name="id2">Status</a></li>
57<li><a class="reference" href="#abstract" id="id2" name="id2">Abstract</a></li> 301<li><a class="reference" href="#abstract" id="id3" name="id3">Abstract</a></li>
58<li><a class="reference" href="#terminology" id="id3" name="id3">Terminology</a></li> 302<li><a class="reference" href="#terminology" id="id4" name="id4">Terminology</a></li>
59<li><a class="reference" href="#motivation-and-rationale" id="id4" name="id4">Motivation and Rationale</a></li> 303<li><a class="reference" href="#motivation-and-rationale" id="id5" name="id5">Motivation and Rationale</a></li>
60<li><a class="reference" href="#specification" id="id5" name="id5">Specification</a><ul> 304<li><a class="reference" href="#specification" id="id6" name="id6">Specification</a><ul>
61<li><a class="reference" href="#ebuild-libraries-elibs-for-short" id="id6" name="id6">Ebuild Libraries (elibs for short)</a></li> 305<li><a class="reference" href="#ebuild-libraries-elibs-for-short" id="id7" name="id7">Ebuild Libraries (elibs for short)</a></li>
62<li><a class="reference" href="#the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements" id="id7" name="id7">The reduced role of Eclasses, and a clarification of existing Eclass requirements</a></li> 306<li><a class="reference" href="#the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements" id="id8" name="id8">The reduced role of Eclasses, and a clarification of existing Eclass requirements</a></li>
63<li><a class="reference" href="#the-end-of-backwards-compatibility" id="id8" name="id8">The end of backwards compatibility...</a></li> 307<li><a class="reference" href="#the-end-of-backwards-compatibility" id="id9" name="id9">The end of backwards compatibility...</a></li>
64<li><a class="reference" href="#tree-restructuring" id="id9" name="id9">Tree restructuring</a></li> 308<li><a class="reference" href="#tree-restructuring" id="id10" name="id10">Tree restructuring</a></li>
65<li><a class="reference" href="#the-start-of-a-different-phase-of-backwards-compatibility" id="id10" name="id10">The start of a different phase of backwards compatibility</a></li> 309<li><a class="reference" href="#the-start-of-a-different-phase-of-backwards-compatibility" id="id11" name="id11">The start of a different phase of backwards compatibility</a></li>
66<li><a class="reference" href="#migrating-to-the-new-setup" id="id11" name="id11">Migrating to the new setup</a></li> 310<li><a class="reference" href="#migrating-to-the-new-setup" id="id12" name="id12">Migrating to the new setup</a></li>
67</ul> 311</ul>
68</li> 312</li>
69<li><a class="reference" href="#backwards-compatibility" id="id12" name="id12">Backwards Compatibility</a></li> 313<li><a class="reference" href="#backwards-compatibility" id="id13" name="id13">Backwards Compatibility</a></li>
70<li><a class="reference" href="#copyright" id="id13" name="id13">Copyright</a></li> 314<li><a class="reference" href="#copyright" id="id14" name="id14">Copyright</a></li>
71</ul> 315</ul>
72</div> 316</div>
73<div class="section" id="abstract"> 317<div class="section">
318<h1><a class="toc-backref" href="#id2" id="status" name="status">Status</a></h1>
319<p>Approved by the Gentoo Council on 15 September 2005. As of Sept. 2006
320this GLEP is on hold, pending future revisions.</p>
321</div>
322<div class="section">
74<h1><a class="toc-backref" href="#id2" name="abstract">Abstract</a></h1> 323<h1><a class="toc-backref" href="#id3" id="abstract" name="abstract">Abstract</a></h1>
75<p>For any design, the transition from theoretical to applied exposes inadequacies 324<p>For any design, the transition from theoretical to applied exposes inadequacies
76in the original design. This document is intended to document, and propose a 325in the original design. This document is intended to document, and propose a
77revision of the current eclass setup to address current eclass inadequacies.</p> 326revision of the current eclass setup to address current eclass inadequacies.</p>
78<p>This document proposes several things- the creation of ebuild libraries, 'elibs', 327<p>This document proposes several things- the creation of ebuild libraries, 'elibs',
79a narrowing of the focus of eclasses, a move of eclasses w/in the tree, the 328a narrowing of the focus of eclasses, a move of eclasses w/in the tree, the
80addition of changelogs, and a way to allow for simple eclass gpg signing. 329addition of changelogs, and a way to allow for simple eclass gpg signing.
81In general, a large scale restructuring of what eclasses are and how they're 330In general, a large scale restructuring of what eclasses are and how they're
82implemented. Essentially version two of the eclass setup.</p> 331implemented. Essentially version two of the eclass setup.</p>
83</div> 332</div>
84<div class="section" id="terminology"> 333<div class="section">
85<h1><a class="toc-backref" href="#id3" name="terminology">Terminology</a></h1> 334<h1><a class="toc-backref" href="#id4" id="terminology" name="terminology">Terminology</a></h1>
86<p>From this point on, the proposed eclass setup will be called 'new eclasses', the 335<p>From this point on, the proposed eclass setup will be called 'new eclasses', the
87existing crop (as of this writing) will be referenced as 'old eclasses'. The 336existing crop (as of this writing) will be referenced as 'old eclasses'. The
88distinction is elaborated on within this document.</p> 337distinction is elaborated on within this document.</p>
89</div> 338</div>
90<div class="section" id="motivation-and-rationale"> 339<div class="section">
91<h1><a class="toc-backref" href="#id4" name="motivation-and-rationale">Motivation and Rationale</a></h1> 340<h1><a class="toc-backref" href="#id5" id="motivation-and-rationale" name="motivation-and-rationale">Motivation and Rationale</a></h1>
92<p>Eclasses within the tree currently are a bit of a mess- they're forced to 341<p>Eclasses within the tree currently are a bit of a mess- they're forced to
93maintain backwards compatibility w/ all previous functionality. In effect, 342maintain backwards compatibility w/ all previous functionality. In effect,
94their api is constant, and can only be added to- never changing the existing 343their api is constant, and can only be added to- never changing the existing
95functionality. This obviously is quite limiting, and leads to cruft accruing in 344functionality. This obviously is quite limiting, and leads to cruft accruing in
96eclasses as a eclasses design is refined. This needs to be dealt with prior to 345eclasses as a eclasses design is refined. This needs to be dealt with prior to
107function they're using, but shouldn't have to worry about their default src_* 356function they're using, but shouldn't have to worry about their default src_*
108and pkg_* functions being overwritten, let alone the env changes.</p> 357and pkg_* functions being overwritten, let alone the env changes.</p>
109<p>Addressing up front why a collection of eclass refinements are being rolled into 358<p>Addressing up front why a collection of eclass refinements are being rolled into
110a single set of changes, parts of this proposal -could- be split into multiple 359a single set of changes, parts of this proposal -could- be split into multiple
111phases. Why do it though? It's simpler for developers to know that the first 360phases. Why do it though? It's simpler for developers to know that the first
112eclass specification was this, and that the second specification is that, 361eclass specification was this, and that the second specification is that,
113rather then requiring them to be aware of what phase of eclass changes is in 362rather then requiring them to be aware of what phase of eclass changes is in
114progress.</p> 363progress.</p>
115<p>By rolling all changes into one large change, a line is intentionally drawn in 364<p>By rolling all changes into one large change, a line is intentionally drawn in
116the sand. Old eclasses allowed for this, behaved this way. New eclasses allow 365the sand. Old eclasses allowed for this, behaved this way. New eclasses allow
117for that, and behave this way. This should reduce misconceptions about what is 366for that, and behave this way. This should reduce misconceptions about what is
118allowed/possible with eclasses, thus reducing bugs that result from said 367allowed/possible with eclasses, thus reducing bugs that result from said
119misconceptions.</p> 368misconceptions.</p>
120<p>A few words on elibs- think of them as a clear definition between behavioral 369<p>A few words on elibs- think of them as a clear definition between behavioral
121functionality of an eclass, and the library functionality. Eclass's modify 370functionality of an eclass, and the library functionality. Eclass's modify
122template data, and are the basis for other ebuilds- elibs, however are <em>just</em> 371template data, and are the basis for other ebuilds- elibs, however are <em>just</em>
123common bash functionality.</p> 372common bash functionality.</p>
124<p>Consider the majority of the portage bin/* scripts- these all are candidates for 373<p>Consider the majority of the portage bin/* scripts- these all are candidates for
125being added to the tree as elibs, as is the bulk of eutils.</p> 374being added to the tree as elibs, as is the bulk of eutils.</p>
126</div> 375</div>
127<div class="section" id="specification"> 376<div class="section">
128<h1><a class="toc-backref" href="#id5" name="specification">Specification</a></h1> 377<h1><a class="toc-backref" href="#id6" id="specification" name="specification">Specification</a></h1>
129<p>The various parts of this proposal are broken down into a set of changes and 378<p>The various parts of this proposal are broken down into a set of changes and
130elaborations on why a proposed change is preferable. It's advisable to the 379elaborations on why a proposed change is preferable. It's advisable to the
131reader that this be read serially, rather then jumping around.</p> 380reader that this be read serially, rather then jumping around.</p>
132<div class="section" id="ebuild-libraries-elibs-for-short"> 381<div class="section">
133<h2><a class="toc-backref" href="#id6" name="ebuild-libraries-elibs-for-short">Ebuild Libraries (elibs for short)</a></h2> 382<h2><a class="toc-backref" href="#id7" id="ebuild-libraries-elibs-for-short" name="ebuild-libraries-elibs-for-short">Ebuild Libraries (elibs for short)</a></h2>
134<p>As briefly touched upon in Motivation and Rationale, the original eclass design 383<p>As briefly touched upon in Motivation and Rationale, the original eclass design
135allowed for the eclass to modify the metadata of an ebuild, metadata being the 384allowed for the eclass to modify the metadata of an ebuild, metadata being the
136DEPENDS, RDEPENDS, SRC_URI, IUSE, etc, vars that are required to be constant, 385DEPENDS, RDEPENDS, SRC_URI, IUSE, etc, vars that are required to be constant,
137and used by portage for dep resolution, fetching, etc. Using the earlier 386and used by portage for dep resolution, fetching, etc. Using the earlier
138example, if you're after a single function from an eclass (say epatch from 387example, if you're after a single function from an eclass (say epatch from
140inheriting might do. You want to treat the eclass you're pulling from as a 389inheriting might do. You want to treat the eclass you're pulling from as a
141library, pure and simple.</p> 390library, pure and simple.</p>
142<p>A new directory named elib should be added to the top level of the tree to serve 391<p>A new directory named elib should be added to the top level of the tree to serve
143as a repository of ebuild function libraries. Rather then relying on using the 392as a repository of ebuild function libraries. Rather then relying on using the
144source command, an 'elib' function should be added to portage to import that 393source command, an 'elib' function should be added to portage to import that
145libraries functionality. The reason for the indirection via the function is 394libraries functionality. The reason for the indirection via the function is
146mostly related to portage internals, but it does serve as an abstraction such 395mostly related to portage internals, but it does serve as an abstraction such
147that (for example) zsh compatibility hacks could be hidden in the elib function.</p> 396that (for example) zsh compatibility hacks could be hidden in the elib function.</p>
148<p>Elib's will be collections of bash functions- they're not allowed to do anything 397<p>Elib's will be collections of bash functions- they're not allowed to do anything
149in the global scope aside from function definition, and any -minimal- 398in the global scope aside from function definition, and any -minimal-
150initialization of the library that is absolutely needed. Additionally, they 399initialization of the library that is absolutely needed. Additionally, they
151cannot modify any ebuild template functions- src_compile, src_unpack. Since they are 400cannot modify any ebuild template functions- src_compile, src_unpack. Since they are
152required to not modify the metadata keys, nor in any way affect the ebuild aside 401required to not modify the metadata keys, nor in any way affect the ebuild aside
153from providing functionality, they can be conditionally pulled in. They also 402from providing functionality, they can be conditionally pulled in. They also
154are allowed to pull in other elibs, but strictly just elibs- no eclasses, just 403are allowed to pull in other elibs, but strictly just elibs- no eclasses, just
155other elibs. A real world example would be the eutils eclass.</p> 404other elibs. A real world example would be the eutils eclass.</p>
156<p>Portage, since the elib's don't modify metadata, isn't required to track elibs 405<p>Portage, since the elib's don't modify metadata, isn't required to track elibs
157as it tracks eclasses. Thus a change in an elib doesn't result in half the tree 406as it tracks eclasses. Thus a change in an elib doesn't result in half the tree
158forced to be regenerated/marked stale when changed (this is more of an infra 407forced to be regenerated/marked stale when changed (this is more of an infra
159benefit, although regen's that take too long due to eclass changes have been 408benefit, although regen's that take too long due to eclass changes have been
160known to cause rsync issues due to missing timestamps).</p> 409known to cause rsync issues due to missing timestamps).</p>
161<p>Elibs will not be available in the global scope of an eclass, or ebuild- nor during the 410<p>Elibs will not be available in the global scope of an eclass, or ebuild- nor during the
162depends phase (basically a phase that sources the ebuild, to get its metadata). Elib 411depends phase (basically a phase that sources the ebuild, to get its metadata). Elib
163calls in the global scope will be tracked, but the elib will not be loaded till just before 412calls in the global scope will be tracked, but the elib will not be loaded till just before
164the setup phase (pkg_setup). There are two reasons for this- first, it ensures elibs are 413the setup phase (pkg_setup). There are two reasons for this- first, it ensures elibs are
165completely incapable of modifying metadata. There is no room for confusion, late loading 414completely incapable of modifying metadata. There is no room for confusion, late loading
166of elibs gives you the functionality for all phases, except for depends- depends being the 415of elibs gives you the functionality for all phases, except for depends- depends being the
167only phase that is capable of specifying metadata. Second, as an added bonus, late 416only phase that is capable of specifying metadata. Second, as an added bonus, late
168loading reduces the amount of bash sourced for a regen- faster regens. This however is minor, 417loading reduces the amount of bash sourced for a regen- faster regens. This however is minor,
169and is an ancillary benefit of the first reason.</p> 418and is an ancillary benefit of the first reason.</p>
170<p>There are a few further restrictions with elibs--mainly, elibs to load can only be specified 419<p>There are a few further restrictions with elibs--mainly, elibs to load can only be specified
171in either global scope, or in the setup, unpack, compile, test, and install phases. You can 420in either global scope, or in the setup, unpack, compile, test, and install phases. You can
172not load elibs in prerm, postrm, preinst, and postinst. The reason being, for *rm phases, 421not load elibs in prerm, postrm, preinst, and postinst. The reason being, for *rm phases,
173installed pkgs will have to look to the tree for the elib, which allows for api drift to cause 422installed pkgs will have to look to the tree for the elib, which allows for api drift to cause
174breakage. For *inst phases, same thing, except the culprit is binpkgs.</p> 423breakage. For *inst phases, same thing, except the culprit is binpkgs.</p>
175<p>There is a final restriction--elibs cannot change their exported api dependent on the api 424<p>There is a final restriction--elibs cannot change their exported api dependent on the api
176(as some eclass do for example). The reason mainly being that elibs are loaded once--not 425(as some eclass do for example). The reason mainly being that elibs are loaded once--not
177multiple times, as eclasses are.</p> 426multiple times, as eclasses are.</p>
178<p>To clarify, for example this is invalid.</p> 427<p>To clarify, for example this is invalid.</p>
179<pre class="literal-block"> 428<pre class="literal-block">
180if [[ -n ${SOME_VAR} ]]; then 429if [[ -n ${SOME_VAR} ]]; then
181 func x() { echo &quot;I'm accessible only via tweaking some var&quot;;} 430 func x() { echo &quot;I'm accessible only via tweaking some var&quot;;}
192<p>There is no need for backwards compatibility with elibs- they just must work 441<p>There is no need for backwards compatibility with elibs- they just must work
193against the current tree. Thus elibs can be removed when the tree no longer 442against the current tree. Thus elibs can be removed when the tree no longer
194needs them. The reasons for this are explained below.</p> 443needs them. The reasons for this are explained below.</p>
195<p>Structuring of the elibs directory will be exactly the same as that of the new 444<p>Structuring of the elibs directory will be exactly the same as that of the new
196eclass directory (detailed below), sans a different extension.</p> 445eclass directory (detailed below), sans a different extension.</p>
197<p>As to why their are so many restrictions, the answer is simple- the definition of 446<p>As to why their are so many restrictions, the answer is simple- the definition of
198what elibs are, what they are capable of, and how to use them is nailed down as much as 447what elibs are, what they are capable of, and how to use them is nailed down as much as
199possible to avoid <em>any</em> ambiguity related to them. The intention is to make it clear, 448possible to avoid <em>any</em> ambiguity related to them. The intention is to make it clear,
200such that no misconceptions occur, resulting in bugs.</p> 449such that no misconceptions occur, resulting in bugs.</p>
201</div> 450</div>
202<div class="section" id="the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements"> 451<div class="section">
203<h2><a class="toc-backref" href="#id7" name="the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements">The reduced role of Eclasses, and a clarification of existing Eclass requirements</a></h2> 452<h2><a class="toc-backref" href="#id8" id="the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements" name="the-reduced-role-of-eclasses-and-a-clarification-of-existing-eclass-requirements">The reduced role of Eclasses, and a clarification of existing Eclass requirements</a></h2>
204<p>Since elibs are now intended on holding common bash functionality, the focus of 453<p>Since elibs are now intended on holding common bash functionality, the focus of
205eclasses should be in defining an appropriate template for ebuilds. For example, 454eclasses should be in defining an appropriate template for ebuilds. For example,
206defining common DEPENDS, RDEPENDS, src_compile functions, src_unpack, etc. 455defining common DEPENDS, RDEPENDS, src_compile functions, src_unpack, etc.
207Additionally, eclasses should pull in any elibs they need for functionality.</p> 456Additionally, eclasses should pull in any elibs they need for functionality.</p>
208<p>Eclass functionality that isn't directly related to the metadata, or src_* and 457<p>Eclass functionality that isn't directly related to the metadata, or src_* and
221pulled in, leading to compilation failure, or dud deps.</p> 470pulled in, leading to compilation failure, or dud deps.</p>
222<p>If the existing metadata isn't flexible enough for what is required for a 471<p>If the existing metadata isn't flexible enough for what is required for a
223package, the parsing of the metadata is changed to address that. Cases where 472package, the parsing of the metadata is changed to address that. Cases where
224the constant requirement is violated are known, and a select few are allowed- 473the constant requirement is violated are known, and a select few are allowed-
225these are exceptions to the rule that are required due to inadequacies in 474these are exceptions to the rule that are required due to inadequacies in
226portage. Any case where it's determined the constant requirement may need to be 475portage. Any case where it's determined the constant requirement may need to be
227violated the dev must make it aware to the majority of devs, along with the portage 476violated the dev must make it aware to the majority of devs, along with the portage
228devs. This should be done prior to committing.</p> 477devs. This should be done prior to committing.</p>
229<p>It's quite likely there is a way to allow what you're attempting- if you just go 478<p>It's quite likely there is a way to allow what you're attempting- if you just go
230and do it, the rsync users (our user base) suffer the results of compilation 479and do it, the rsync users (our user base) suffer the results of compilation
231failures and unneeded deps being pulled in.</p> 480failures and unneeded deps being pulled in.</p>
232<p>After that stern reminder, back to new eclasses. Defining INHERITED and ECLASS 481<p>After that stern reminder, back to new eclasses. Defining INHERITED and ECLASS
236indefinitely- compatibility must be maintained against the current tree, but 485indefinitely- compatibility must be maintained against the current tree, but
237just that. As such new eclasses (the true distinction of new vs old is 486just that. As such new eclasses (the true distinction of new vs old is
238elaborated in the next section) can be removed from the tree once they're no 487elaborated in the next section) can be removed from the tree once they're no
239longer in use.</p> 488longer in use.</p>
240</div> 489</div>
241<div class="section" id="the-end-of-backwards-compatibility"> 490<div class="section">
242<h2><a class="toc-backref" href="#id8" name="the-end-of-backwards-compatibility">The end of backwards compatibility...</a></h2> 491<h2><a class="toc-backref" href="#id9" id="the-end-of-backwards-compatibility" name="the-end-of-backwards-compatibility">The end of backwards compatibility...</a></h2>
243<p>With current eclasses, once the eclass is in use, its api can no longer be 492<p>With current eclasses, once the eclass is in use, its api can no longer be
244changed, nor can the eclass ever be removed from the tree. This is why we still 493changed, nor can the eclass ever be removed from the tree. This is why we still
245have <em>ancient</em> eclasses that are completely unused sitting in the tree, for 494have <em>ancient</em> eclasses that are completely unused sitting in the tree, for
246example inherit.eclass. The reason for this, not surprisingly, is a portage 495example inherit.eclass. The reason for this, not surprisingly, is a portage
247deficiency: on unmerging an installed ebuild, portage used the eclass from the 496deficiency: on unmerging an installed ebuild, portage used the eclass from the
248current tree.</p> 497current tree.</p>
249<p>For a real world example of this, if you merged a glibc 2 years back, whatever 498<p>For a real world example of this, if you merged a glibc 2 years back, whatever
250eclasses it used must still be compatible, or you may not be able to unmerge the 499eclasses it used must still be compatible, or you may not be able to unmerge the
251older glibc version during an upgrade to a newer version. So either the glibc 500older glibc version during an upgrade to a newer version. So either the glibc
260be re-used rather then relying on the eclass. In other words, binpkgs and 509be re-used rather then relying on the eclass. In other words, binpkgs and
261installed ebuilds will no longer go and pull needed eclasses from the tree, 510installed ebuilds will no longer go and pull needed eclasses from the tree,
262they'll use the 'saved' version of the eclass they were built/merged with.</p> 511they'll use the 'saved' version of the eclass they were built/merged with.</p>
263<p>So the backwards compatibility requirement for users of the next major portage 512<p>So the backwards compatibility requirement for users of the next major portage
264version (and beyond) isn't required. All the cruft can be dropped.</p> 513version (and beyond) isn't required. All the cruft can be dropped.</p>
265<p>The problem is that there will be users using older versions of portage that don't 514<p>The problem is that there will be users using older versions of portage that don't
266support this functionality- these older installations <em>cannot</em> use the 515support this functionality- these older installations <em>cannot</em> use the
267new eclasses, due to the fact that their portage version is incapable of 516new eclasses, due to the fact that their portage version is incapable of
268properly relying on the env- in other words, the varying api of the eclass will 517properly relying on the env- in other words, the varying api of the eclass will
269result in user-visible failures during unmerging.</p> 518result in user-visible failures during unmerging.</p>
270<p>So we're able to do a clean break of all old eclasses, and api cruft, but we need 519<p>So we're able to do a clean break of all old eclasses, and api cruft, but we need
271a means to basically disallow access to the new eclasses for all portage versions 520a means to basically disallow access to the new eclasses for all portage versions
272incapable of properly handling the env requirements.</p> 521incapable of properly handling the env requirements.</p>
273<p>Unfortunately, we cannot just rely on a different grouping/naming convention within 522<p>Unfortunately, we cannot just rely on a different grouping/naming convention within
274the old eclass directory. The new eclasses must be inaccessible, and portage throws 523the old eclass directory. The new eclasses must be inaccessible, and portage throws
275a snag into this- the existing inherit function that is used to handle existing 524a snag into this- the existing inherit function that is used to handle existing
276eclasses. Basically, whatever it's passed (inherit kernel or inherit 525eclasses. Basically, whatever it's passed (inherit kernel or inherit
277kernel/kernel) it will pull in (kernel.eclass, and kernel/kernel.eclass 526kernel/kernel) it will pull in (kernel.eclass, and kernel/kernel.eclass
278respectively). So even if the new eclasses were implemented within a 527respectively). So even if the new eclasses were implemented within a
279subdirectory of the eclass dir in the tree, all current portage versions would 528subdirectory of the eclass dir in the tree, all current portage versions would
280still be able to access them.</p> 529still be able to access them.</p>
281<p>In other words, these new eclasses would in effect, be old eclasses since older 530<p>In other words, these new eclasses would in effect, be old eclasses since older
282portage versions could still access them.</p> 531portage versions could still access them.</p>
283</div> 532</div>
284<div class="section" id="tree-restructuring"> 533<div class="section">
285<h2><a class="toc-backref" href="#id9" name="tree-restructuring">Tree restructuring</a></h2> 534<h2><a class="toc-backref" href="#id10" id="tree-restructuring" name="tree-restructuring">Tree restructuring</a></h2>
286<p>There are only two way to block the existing (as of this writing) inherit 535<p>There are only two way to block the existing (as of this writing) inherit
287functionality from accessing the new eclasses- either change the extension of 536functionality from accessing the new eclasses- either change the extension of
288eclasses to something other then 'eclass', or to have them stored in a separate 537eclasses to something other then 'eclass', or to have them stored in a separate
289subdirectory of the tree then eclass.</p> 538subdirectory of the tree then eclass.</p>
290<p>The latter is preferable, and the proposed solution. Reasons are- the current 539<p>The latter is preferable, and the proposed solution. Reasons are- the current
291eclass directory is already overgrown. Structuring of the new eclass dir 540eclass directory is already overgrown. Structuring of the new eclass dir
292(clarified below) will allow for easier signing, ChangeLogs, and grouping of 541(clarified below) will allow for easier signing, ChangeLogs, and grouping of
293eclasses. New eclasses allow for something akin to a clean break and have new 542eclasses. New eclasses allow for something akin to a clean break and have new
294capabilities/requirements, thus it's advisable to start with a clean directory, 543capabilities/requirements, thus it's advisable to start with a clean directory,
295devoid of all cruft from the old eclass implementation.</p> 544devoid of all cruft from the old eclass implementation.</p>
296<p>If it's unclear as to why the old inherit function <em>cannot</em> access the new 545<p>If it's unclear as to why the old inherit function <em>cannot</em> access the new
297eclasses, please reread the previous section. It's unfortunately a requirement 546eclasses, please reread the previous section. It's unfortunately a requirement
298to take advantage of all that the next major portage release will allow.</p> 547to take advantage of all that the next major portage release will allow.</p>
299<p>The proposed directory structure is ${PORTDIR}/include/{eclass,elib}. 548<p>The proposed directory structure is ${PORTDIR}/include/{eclass,elib}.
323to ensure no files are missing, and that nothing has been tainted.</p> 572to ensure no files are missing, and that nothing has been tainted.</p>
324<p>The elib directory will be structured in the same way, for the same reasons.</p> 573<p>The elib directory will be structured in the same way, for the same reasons.</p>
325<p>Repoman will have to be extended to work within new eclass and elib groups, and 574<p>Repoman will have to be extended to work within new eclass and elib groups, and
326to handle signing and committing. This is intentional, and a good thing. This 575to handle signing and committing. This is intentional, and a good thing. This
327gives repoman the possibility of doing sanity checks on elibs/new eclasses.</p> 576gives repoman the possibility of doing sanity checks on elibs/new eclasses.</p>
328<p>Note these checks will not prevent developers from doing dumb things with eclass- 577<p>Note these checks will not prevent developers from doing dumb things with eclass-
329these checks would only be capable of doing basic sanity checks, such as syntax checks. 578these checks would only be capable of doing basic sanity checks, such as syntax checks.
330There is no way to prevent people from doing dumb things (exempting perhaps repeated 579There is no way to prevent people from doing dumb things (exempting perhaps repeated
331applications of a cattle prod)- these are strictly automatic checks, akin to repoman's 580applications of a cattle prod)- these are strictly automatic checks, akin to repoman's
332dependency checks.</p> 581dependency checks.</p>
333</div> 582</div>
334<div class="section" id="the-start-of-a-different-phase-of-backwards-compatibility"> 583<div class="section">
335<h2><a class="toc-backref" href="#id10" name="the-start-of-a-different-phase-of-backwards-compatibility">The start of a different phase of backwards compatibility</a></h2> 584<h2><a class="toc-backref" href="#id11" id="the-start-of-a-different-phase-of-backwards-compatibility" name="the-start-of-a-different-phase-of-backwards-compatibility">The start of a different phase of backwards compatibility</a></h2>
336<p>As clarified above, new eclasses will exist in a separate directory that will be 585<p>As clarified above, new eclasses will exist in a separate directory that will be
337intentionally inaccessible to the inherit function. As such, users of older 586intentionally inaccessible to the inherit function. As such, users of older
338portage versions <em>will</em> have to upgrade to merge any ebuild that uses elibs/new 587portage versions <em>will</em> have to upgrade to merge any ebuild that uses elibs/new
339eclasses. A depend on the next major portage version would transparently handle 588eclasses. A depend on the next major portage version would transparently handle
340this for rsync users.</p> 589this for rsync users.</p>
341<p>There still is the issue of users who haven't upgraded to the required portage 590<p>There still is the issue of users who haven't upgraded to the required portage
342version. This is a minor concern frankly- portage releases include new 591version. This is a minor concern frankly- portage releases include new
343functionality, and bug fixes. If they won't upgrade, it's assumed they have 592functionality, and bug fixes. If they won't upgrade, it's assumed they have
344their reasons and are big boys, thus able to handle the complications themselves.</p> 593their reasons and are big boys, thus able to handle the complications themselves.</p>
358<p>For users who do not upgrade within the window of N months while the old 607<p>For users who do not upgrade within the window of N months while the old
359eclasses are in the tree, as stated, it's assumed they know what they are doing. 608eclasses are in the tree, as stated, it's assumed they know what they are doing.
360If they specifically block the new portage version, as the ebuilds in the tree 609If they specifically block the new portage version, as the ebuilds in the tree
361migrate to the new eclasses, they will have less and less ebuilds available to 610migrate to the new eclasses, they will have less and less ebuilds available to
362them. If they tried injecting the new portage version (lying to portage, 611them. If they tried injecting the new portage version (lying to portage,
363essentially), portage would bail since it cannot find the new eclass. 612essentially), portage would bail since it cannot find the new eclass.
364For ebuilds that use the new eclasses, there really isn't any way to sidestep 613For ebuilds that use the new eclasses, there really isn't any way to sidestep
365the portage version requirement- same as it has been for other portage features.</p> 614the portage version requirement- same as it has been for other portage features.</p>
366<p>What is a bit more annoying is that once the old eclasses are out of the tree, 615<p>What is a bit more annoying is that once the old eclasses are out of the tree,
367if a user has not upgraded to a portage version supporting env processing, they 616if a user has not upgraded to a portage version supporting env processing, they
368will lose the ability to unmerge any installed ebuild that used an old 617will lose the ability to unmerge any installed ebuild that used an old
369eclass. Same cause, different symptom being they will lose the ability to merge 618eclass. Same cause, different symptom being they will lose the ability to merge
370any tbz2 that uses old eclasses also.</p> 619any tbz2 that uses old eclasses also.</p>
371<p>There is one additional case that is a rarity, but should be noted- if a user 620<p>There is one additional case that is a rarity, but should be noted- if a user
372has suffered significant corruption of their installed package database (vdb). This is 621has suffered significant corruption of their installed package database (vdb). This is
373ignoring the question of whether the vdb is even usable at this point, but the possibility 622ignoring the question of whether the vdb is even usable at this point, but the possibility
374exists for the saved envs to be non usable due to either A) missing, or B) corrupted. 623exists for the saved envs to be non usable due to either A) missing, or B) corrupted.
375In such a case, even with the new portage capabilities, they would need 624In such a case, even with the new portage capabilities, they would need
376the old eclass compat ebuild.</p> 625the old eclass compat ebuild.</p>
377<p>Note for this to happen requires either rather... unwise uses of root, or significant 626<p>Note for this to happen requires either rather... unwise uses of root, or significant
378fs corruption. Regardless of the cause, it's quite likely for this to even become an 627fs corruption. Regardless of the cause, it's quite likely for this to even become an
379issue, the system's vdb is completely unusable. It's a moot issue at that point. 628issue, the system's vdb is completely unusable. It's a moot issue at that point.
380If you lose your vdb, or it gets seriously damaged, it's akin to lobotomizing portage- 629If you lose your vdb, or it gets seriously damaged, it's akin to lobotomizing portage-
381it doesn't know what's installed, it doesn't know of its own files, and in general, 630it doesn't know what's installed, it doesn't know of its own files, and in general,
382a rebuilding of the system is about the only sane course of action. The missing env is 631a rebuilding of the system is about the only sane course of action. The missing env is
383truly the least of the users concern in such a case.</p> 632truly the least of the users concern in such a case.</p>
384<p>Continuing with the more likely scenario, users unwilling to upgrade portage will 633<p>Continuing with the more likely scenario, users unwilling to upgrade portage will
385<em>not</em> be left out in the rain. Merging the old eclass compat ebuild will provide 634<em>not</em> be left out in the rain. Merging the old eclass compat ebuild will provide
386the missing eclasses, thus providing that lost functionality.</p> 635the missing eclasses, thus providing that lost functionality.</p>
387<p>Note the intention isn't to force them to upgrade, hence the ability to restore the 636<p>Note the intention isn't to force them to upgrade, hence the ability to restore the
388lost functionality. The intention is to clean up the existing mess, and allow us 637lost functionality. The intention is to clean up the existing mess, and allow us
389to move forward. The saying &quot;you've got to break a few eggs to make an omelet&quot; 638to move forward. The saying &quot;you've got to break a few eggs to make an omelet&quot;
390is akin, exempting the fact we're providing a way to make the eggs whole again 639is akin, exempting the fact we're providing a way to make the eggs whole again
391(the king's men would've loved such an option).</p> 640(the king's men would've loved such an option).</p>
392</div> 641</div>
393<div class="section" id="migrating-to-the-new-setup"> 642<div class="section">
394<h2><a class="toc-backref" href="#id11" name="migrating-to-the-new-setup">Migrating to the new setup</a></h2> 643<h2><a class="toc-backref" href="#id12" id="migrating-to-the-new-setup" name="migrating-to-the-new-setup">Migrating to the new setup</a></h2>
395<p>As has been done in the past whenever a change in the tree results in ebuilds 644<p>As has been done in the past whenever a change in the tree results in ebuilds
396requiring a specific version of portage, as ebuilds migrate to the new eclasses, 645requiring a specific version of portage, as ebuilds migrate to the new eclasses,
397they should depend on a version of portage that supports it. From the users 646they should depend on a version of portage that supports it. From the users
398viewpoint, this transparently handles the migration.</p> 647viewpoint, this transparently handles the migration.</p>
399<p>This isn't so transparent for devs or a particular infrastructure server however. 648<p>This isn't so transparent for devs or a particular infrastructure server however.
417<p>Essentially, you have a chance to nail the design perfectly/cleanly, and have a 666<p>Essentially, you have a chance to nail the design perfectly/cleanly, and have a
418window in which to redesign it. It's humbly suggested eclass devs take 667window in which to redesign it. It's humbly suggested eclass devs take
419advantage of it. :)</p> 668advantage of it. :)</p>
420</div> 669</div>
421</div> 670</div>
422<div class="section" id="backwards-compatibility"> 671<div class="section">
423<h1><a class="toc-backref" href="#id12" name="backwards-compatibility">Backwards Compatibility</a></h1> 672<h1><a class="toc-backref" href="#id13" id="backwards-compatibility" name="backwards-compatibility">Backwards Compatibility</a></h1>
424<p>All backwards compatibility issues are addressed in line, but a recap is offered- 673<p>All backwards compatibility issues are addressed in line, but a recap is offered-
425it's suggested that if the a particular compatibility issue is 674it's suggested that if the a particular compatibility issue is
426questioned/worried over, the reader read the relevant section. There should be 675questioned/worried over, the reader read the relevant section. There should be
427a more in depth discussion of the issue, along with a more extensive explanation 676a more in depth discussion of the issue, along with a more extensive explanation
428of the potential solutions, and reasons for the chosen solution.</p> 677of the potential solutions, and reasons for the chosen solution.</p>
436'thinning' of available ebuilds should they block the portage upgrade is 685'thinning' of available ebuilds should they block the portage upgrade is
437their responsibility. 686their responsibility.
438 687
439Old eclasses at some point in the future should be removed from the tree, 688Old eclasses at some point in the future should be removed from the tree,
440and released in a tarball/ebuild. This will cause installed ebuilds that 689and released in a tarball/ebuild. This will cause installed ebuilds that
441rely on the old eclass to be unable to unmerge, with the same applying for 690rely on the old eclass to be unable to unmerge, with the same applying for
442merging of binpkgs dependent on the following paragraph. 691merging of binpkgs dependent on the following paragraph.
443 692
444The old eclass-compat is only required for users who do not upgrade their 693The old eclass-compat is only required for users who do not upgrade their
445portage installation, and one further exemption- if the user has somehow 694portage installation, and one further exemption- if the user has somehow
446corrupted/destroyed their installed pkgs database (/var/db/pkg currently), 695corrupted/destroyed their installed pkgs database (/var/db/pkg currently),
447in the process, they've lost their saved environments. The eclass-compat 696in the process, they've lost their saved environments. The eclass-compat
448ebuild would be required for ebuilds that required older eclasses in such a 697ebuild would be required for ebuilds that required older eclasses in such a
449case. Note, this case is rare also- as clarified above, it's mentioned 698case. Note, this case is rare also- as clarified above, it's mentioned
450strictly to be complete, it's not much of a real world scenario as elaborated 699strictly to be complete, it's not much of a real world scenario as elaborated
451above. 700above.
452</pre> 701</pre>
453</div> 702</div>
454<div class="section" id="copyright"> 703<div class="section">
455<h1><a class="toc-backref" href="#id13" name="copyright">Copyright</a></h1> 704<h1><a class="toc-backref" href="#id14" id="copyright" name="copyright">Copyright</a></h1>
456<p>This document has been placed in the public domain.</p> 705<p>This document has been placed in the public domain.</p>
457</div> 706</div>
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460<div class="footer"> 709<div class="footer">
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462<a class="reference" href="glep-0033.txt">View document source</a>. 711<a class="reference" href="glep-0033.txt">View document source</a>.
463Generated on: 2005-09-15 02:37 UTC. 712Generated on: 2006-10-10 20:23 UTC.
464Generated 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. 713Generated 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.
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