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authorRené 'Necoro' Neumann <necoro@necoro.net>2009-08-15 15:09:24 +0200
committerRené 'Necoro' Neumann <necoro@necoro.net>2009-08-15 15:09:24 +0200
commite65b90763927ec9133f9b9c30e00b0a70b13b14b (patch)
treec7ba0f10da3c71682cdfac6ee068fb8dd42d511c /eix-format.html
parent754ce03319038f37e463cf091501d6e66958c375 (diff)
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-<div class="document" id="eix-index-file-format">
-<h1 class="title">eix - index file format</h1>
-<table class="docinfo" frame="void" rules="none">
-<col class="docinfo-name" />
-<col class="docinfo-content" />
-<tbody valign="top">
-<tr><th class="docinfo-name">Authors:</th>
-<td>Martin Väth &lt;vaeth AT mathematik DOT uni-wuerzburg DOT de&gt; (active)
-<br />Emil Beinroth &lt;emilbeinroth AT gmx DOT net&gt; (active)
-<br />Wolfgang Frisch &lt;xororand AT users DOT sourceforge DOT net&gt; (inactive)</td></tr>
-<tr><th class="docinfo-name">Copyright:</th>
-<td>This file is part of the eix project and distributed under the
-terms of the GNU General Public License v2.</td></tr>
-</tbody>
-</table>
-<p>This article describes the format of the eix index file, usually located at /var/cache/eix. The
-format includes a version field in the <a class="reference internal" href="#header">header</a> block. The current version is <strong>28</strong> (eix 0.17.0).</p>
-<div class="contents topic" id="table-of-contents">
-<p class="topic-title first"><strong>Table of Contents</strong>:</p>
-<ul class="simple">
-<li><a class="reference internal" href="#overall-layout" id="id3">Overall layout</a></li>
-<li><a class="reference internal" href="#basic-datatypes" id="id4">Basic Datatypes</a><ul>
-<li><a class="reference internal" href="#number" id="id5">Number</a></li>
-<li><a class="reference internal" href="#vector" id="id6">Vector</a></li>
-<li><a class="reference internal" href="#string" id="id7">String</a></li>
-<li><a class="reference internal" href="#hash" id="id8">Hash</a></li>
-<li><a class="reference internal" href="#hashedstring" id="id9">HashedString</a></li>
-<li><a class="reference internal" href="#hashedwords" id="id10">HashedWords</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#data-blocks" id="id11">Data blocks</a><ul>
-<li><a class="reference internal" href="#header" id="id12">Header</a></li>
-<li><a class="reference internal" href="#overlay" id="id13">Overlay</a></li>
-<li><a class="reference internal" href="#category" id="id14">Category</a></li>
-<li><a class="reference internal" href="#package" id="id15">Package</a></li>
-<li><a class="reference internal" href="#version" id="id16">Version</a></li>
-<li><a class="reference internal" href="#versionpart" id="id17">VersionPart</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#historical-notes" id="id18">Historical notes</a></li>
-</ul>
-</div>
-<div class="section" id="overall-layout">
-<h1>Overall layout</h1>
-<p>The file is made up of blocks of data,
-which may in turn contain other other blocks. <a class="footnote-reference" href="#vector-vs-blocks" id="id1">[1]</a>
-The first block is a special header.
-The remaining blocks are the categories which in turn contain the package blocks
-which contain the version blocks, ...</p>
-<blockquote>
-<div class="layout-block header-block container">
-<a class="reference internal" href="#header">Header</a></div>
-<div class="layout-block category-block container">
-<p>1st <a class="reference internal" href="#category">Category</a></p>
-<div class="layout-block package-block container">
-<p>1st <a class="reference internal" href="#package">Package</a> in 1st Category</p>
-<div class="layout-block version-block container">
-1st <a class="reference internal" href="#version">Version</a> of this Package</div>
-<div class="layout-block version-block container">
-[..]</div>
-</div>
-<div class="layout-block package-block container">
-<p>2nd <a class="reference internal" href="#package">Package</a> in 1st Category</p>
-<p>[..]</p>
-</div>
-</div>
-<div class="layout-block category-block container">
-<p>2nd <a class="reference internal" href="#category">Category</a></p>
-<p>[..]</p>
-</div>
-</blockquote>
-<table class="docutils footnote" frame="void" id="vector-vs-blocks" rules="none">
-<colgroup><col class="label" /><col /></colgroup>
-<tbody valign="top">
-<tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td>Most blocks here occur as a <cite>vector</cite> (described below), i.e. the
-first entry is the number of elements, followed by the individual elements.
-However, if not stated explicitly that a block is a <cite>vector</cite>, it is
-indicated otherwise in the file how many elements it has.
-For example, the number of category blocks is contained in the <a class="reference internal" href="#header">header</a>.</td></tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="basic-datatypes">
-<h1>Basic Datatypes</h1>
-<p>This section covers the datatypes <cite>number</cite> and <cite>vector</cite> (resp. <cite>string</cite>) which are used in the index file.</p>
-<div class="section" id="number">
-<h2>Number</h2>
-<p>The index file contains non-negative integer values only. The format we use avoids fixed length
-integers by encoding the number of bytes into the integer itself. It has a bias towards numbers
-smaller than 0xFF, which are encoded into a single byte.</p>
-<blockquote>
-<p>To determine the number of bytes used, you must first count how often the byte <strong>0xFF</strong> occurs at
-the beginning of the number.
-Let <cite>n</cite> be this count (<cite>n</cite> may be 0). Then, as a rule, there will follow <cite>n+1</cite> bytes that
-contain the actual integer stored in big-endian byte order (highest byte first).</p>
-<p><em>But</em> since it would be impossible to store any number that has a leading 0xFF with this format,
-a leading 0xFF is stored as 0x00. Meaning, if a 0x00 byte follows the last 0xFF, you must
-interpret this byte as 0xFF inside the number.</p>
-</blockquote>
-<p>Examples:</p>
-<blockquote>
-<table border="1" class="docutils">
-<colgroup>
-<col width="23%" />
-<col width="77%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Number</th>
-<th class="head">Bytes stored in the file</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>0x00</td>
-<td>0x00</td>
-</tr>
-<tr><td>0xFE</td>
-<td>0xFE</td>
-</tr>
-<tr><td>0xFF</td>
-<td>0xFF 0x00</td>
-</tr>
-<tr><td>0x0100</td>
-<td>0xFF 0x01 0x00</td>
-</tr>
-<tr><td>0x01FF</td>
-<td>0xFF 0x01 0xFF</td>
-</tr>
-<tr><td>0xFEFF</td>
-<td>0xFF 0xFE 0xFF</td>
-</tr>
-<tr><td>0xFF00</td>
-<td>0xFF 0xFF 0x00 0x00</td>
-</tr>
-<tr><td>0xFF01</td>
-<td>0xFF 0xFF 0x00 0x01</td>
-</tr>
-<tr><td>0x010000</td>
-<td>0xFF 0xFF 0x01 0x00 0x00</td>
-</tr>
-<tr><td>0xABCDEF</td>
-<td>0xFF 0xFF 0xAB 0xCD 0xEF</td>
-</tr>
-<tr><td>0xFFABCD</td>
-<td>0xFF 0xFF 0xFF 0x00 0xAB 0xCD</td>
-</tr>
-<tr><td>0x01ABCDEF</td>
-<td>0xFF 0xFF 0xFF 0x01 0xAB 0xCD 0xEF</td>
-</tr>
-</tbody>
-</table>
-</blockquote>
-</div>
-<div class="section" id="vector">
-<h2>Vector</h2>
-<p>Vectors (or lists) are extensively used throughout the index file. They are stored as the <a class="reference internal" href="#number">number</a> of
-elements, followed by the elements themselves.</p>
-<table border="1" class="docutils">
-<colgroup>
-<col width="20%" />
-<col width="80%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>Number</td>
-<td>Number of elements (<cite>n</cite>)</td>
-</tr>
-<tr><td></td>
-<td>1st element</td>
-</tr>
-<tr><td></td>
-<td>...</td>
-</tr>
-<tr><td></td>
-<td><cite>n</cite>th element</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="string">
-<h2>String</h2>
-<p>Strings are stored as a <a class="reference internal" href="#vector">vector</a> of characters. A trailing '\0' is not included.</p>
-</div>
-<div class="section" id="hash">
-<h2>Hash</h2>
-<p>A hash is a <a class="reference internal" href="#vector">vector</a> of <a class="reference internal" href="#string">string</a>s.</p>
-</div>
-<div class="section" id="hashedstring">
-<h2>HashedString</h2>
-<p>A <a class="reference internal" href="#number">number</a> which is considered as an index in the corresponding <a class="reference internal" href="#hash">hash</a>;
-0 denotes the first string of the hash, 1 the second, ...</p>
-</div>
-<div class="section" id="hashedwords">
-<h2>HashedWords</h2>
-<p>A <a class="reference internal" href="#vector">vector</a> of <a class="reference internal" href="#hashedstring">HashedString</a>s.
-The resulting strings are meant to be concatenated, with spaces as separators.</p>
-</div>
-</div>
-<div class="section" id="data-blocks">
-<h1>Data blocks</h1>
-<div class="section" id="header">
-<h2>Header</h2>
-<table border="1" class="docutils">
-<colgroup>
-<col width="19%" />
-<col width="81%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>Number</td>
-<td>File format version</td>
-</tr>
-<tr><td>Number</td>
-<td>Number of <a class="reference internal" href="#category">Category</a> blocks</td>
-</tr>
-<tr><td>Vector</td>
-<td><a class="reference internal" href="#overlay">Overlay</a>s</td>
-</tr>
-<tr><td>Hash</td>
-<td>Hash for &quot;Provide&quot;</td>
-</tr>
-<tr><td>Hash</td>
-<td>Hash for &quot;Licenses&quot;</td>
-</tr>
-<tr><td>Hash</td>
-<td>Hash for &quot;Keywords&quot;</td>
-</tr>
-<tr><td>Hash</td>
-<td>Hash for &quot;Useflags&quot;</td>
-</tr>
-<tr><td>Hash</td>
-<td>Hash for &quot;Slot&quot;</td>
-</tr>
-<tr><td>Vector</td>
-<td>names of world sets</td>
-</tr>
-</tbody>
-</table>
-<p>The names of world sets are the names (without leading &#64;) of the world sets
-stored in /var/lib/portage/world_sets. If SAVE_WORLD=false, the list is empty.</p>
-</div>
-<div class="section" id="overlay">
-<h2>Overlay</h2>
-<table border="1" class="docutils">
-<colgroup>
-<col width="21%" />
-<col width="79%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>String</td>
-<td>overlay path</td>
-</tr>
-<tr><td>String</td>
-<td>label (repository name)</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="category">
-<h2>Category</h2>
-<table border="1" class="docutils">
-<colgroup>
-<col width="18%" />
-<col width="82%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>String</td>
-<td>Name of category</td>
-</tr>
-<tr><td>Vector</td>
-<td><a class="reference internal" href="#package">Package</a>s in this category</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="package">
-<h2>Package</h2>
-<table border="1" class="docutils">
-<colgroup>
-<col width="8%" />
-<col width="92%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>Number</td>
-<td>Offset to the next package in the eix cache file (in bytes; counting starts after the number)</td>
-</tr>
-<tr><td>String</td>
-<td>Package name</td>
-</tr>
-<tr><td>String</td>
-<td>Description</td>
-</tr>
-<tr><td>HashedWords</td>
-<td>Provide</td>
-</tr>
-<tr><td>String</td>
-<td>Homepage</td>
-</tr>
-<tr><td>HashedString</td>
-<td>Licenses, e.g. MPL-1.1 NPL-1.1</td>
-</tr>
-<tr><td>HashedWords</td>
-<td>Useflags (all useflags of all versions of the package are added). This might &quot;falsely&quot; be the empty string if per-version IUSE flags are stored.</td>
-</tr>
-<tr><td>Vector</td>
-<td><a class="reference internal" href="#version">Version</a>s</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="version">
-<h2>Version</h2>
-<table border="1" class="docutils">
-<colgroup>
-<col width="11%" />
-<col width="89%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Type</th>
-<th class="head">Content</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>char</td>
-<td><p class="first">Mask bitset for the current $ARCH:</p>
-<blockquote class="last">
-<table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field"><th class="field-name">0x00:</th><td class="field-body">none of the following</td>
-</tr>
-<tr class="field"><th class="field-name">0x01:</th><td class="field-body">masked by package.mask</td>
-</tr>
-<tr class="field"><th class="field-name">0x02:</th><td class="field-body">masked by profile</td>
-</tr>
-<tr class="field"><th class="field-name">0x04:</th><td class="field-body">version is in &#64;system</td>
-</tr>
-<tr class="field"><th class="field-name">0x08:</th><td class="field-body">version is in &#64;world (if SAVE_WORLD=true)</td>
-</tr>
-</tbody>
-</table>
-</blockquote>
-</td>
-</tr>
-<tr><td>char</td>
-<td><dl class="first last docutils">
-<dt>Mask bitset for the PROPERTIES variable:</dt>
-<dd><table class="first last docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field"><th class="field-name">0x01:</th><td class="field-body">PROPERTIES=interactive</td>
-</tr>
-<tr class="field"><th class="field-name">0x02:</th><td class="field-body">PROPERTIES=live</td>
-</tr>
-<tr class="field"><th class="field-name">0x04:</th><td class="field-body">PROPERTIES=virtual</td>
-</tr>
-</tbody>
-</table>
-</dd>
-</dl>
-</td>
-</tr>
-<tr><td>Number</td>
-<td><dl class="first last docutils">
-<dt>Mask bitset for the RESTRICT variable:</dt>
-<dd><table class="first last docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field"><th class="field-name">0x0001:</th><td class="field-body">RESTRICT=binchecks</td>
-</tr>
-<tr class="field"><th class="field-name">0x0002:</th><td class="field-body">RESTRICT=strip</td>
-</tr>
-<tr class="field"><th class="field-name">0x0004:</th><td class="field-body">RESTRICT=test</td>
-</tr>
-<tr class="field"><th class="field-name">0x0008:</th><td class="field-body">RESTRICT=userpriv</td>
-</tr>
-<tr class="field"><th class="field-name">0x0010:</th><td class="field-body">RESTRICT=installsources</td>
-</tr>
-<tr class="field"><th class="field-name">0x0020:</th><td class="field-body">RESTRICT=fetch</td>
-</tr>
-<tr class="field"><th class="field-name">0x0040:</th><td class="field-body">RESTRICT=mirror</td>
-</tr>
-<tr class="field"><th class="field-name">0x0080:</th><td class="field-body">RESTRICT=primaryuri</td>
-</tr>
-<tr class="field"><th class="field-name">0x0100:</th><td class="field-body">RESTRICT=bindist</td>
-</tr>
-</tbody>
-</table>
-</dd>
-</dl>
-</td>
-</tr>
-<tr><td>HashedWords</td>
-<td>Full keywords string of the ebuild.</td>
-</tr>
-<tr><td>Vector</td>
-<td><a class="reference internal" href="#versionpart">VersionPart</a>s</td>
-</tr>
-<tr><td>HashedString</td>
-<td>Slot name. The slot name &quot;0&quot; is stored as &quot;&quot;.</td>
-</tr>
-<tr><td>Number</td>
-<td>Index of the portage overlay (in the overlays block)</td>
-</tr>
-<tr><td>HashedWords</td>
-<td>Useflags of this version. This might &quot;falsely&quot; be empty if only per-package IUSE flags are stored.</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="versionpart">
-<h2>VersionPart</h2>
-<p>A VersionPart consists of two data: a number (referred to as <em>type</em>) and a &quot;<a class="reference internal" href="#string">string</a>&quot; (referred to as <em>value</em>).</p>
-<p>The number is encoded in the lower 5 bits of the length-part of the &quot;<a class="reference internal" href="#string">string</a>&quot;;
-of course, the actual length is shifted by the same number of bits.</p>
-<p>For the type, these named values are possible:</p>
-<blockquote>
-<table border="1" class="docutils">
-<colgroup>
-<col width="7%" />
-<col width="16%" />
-<col width="77%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Value</th>
-<th class="head">Name</th>
-<th class="head">Content of value</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>0</td>
-<td><cite>garbage</cite></td>
-<td>garbage that was found after any valid version string</td>
-</tr>
-<tr><td>1</td>
-<td><cite>alpha</cite></td>
-<td>number of &quot;_alpha&quot; (may be empty)</td>
-</tr>
-<tr><td>2</td>
-<td><cite>beta</cite></td>
-<td>number of &quot;_beta&quot; (may be empty)</td>
-</tr>
-<tr><td>3</td>
-<td><cite>pre</cite></td>
-<td>number of &quot;_pre&quot; (may be empty)</td>
-</tr>
-<tr><td>4</td>
-<td><cite>rc</cite></td>
-<td>number of &quot;_rc&quot; (may be empty)</td>
-</tr>
-<tr><td>5</td>
-<td><cite>revision</cite></td>
-<td>number of &quot;-r&quot; (may be empty)</td>
-</tr>
-<tr><td>6</td>
-<td><cite>inter_rev</cite></td>
-<td>number of inter-revision <a class="footnote-reference" href="#inter-revisions" id="id2">[2]</a></td>
-</tr>
-<tr><td>7</td>
-<td><cite>patch</cite></td>
-<td>number of &quot;_p&quot; (may be empty)</td>
-</tr>
-<tr><td>8</td>
-<td><cite>char</cite></td>
-<td>single character</td>
-</tr>
-<tr><td>9</td>
-<td><cite>primary</cite></td>
-<td>numeric version part</td>
-</tr>
-<tr><td>10</td>
-<td><cite>first</cite></td>
-<td>first numeric version part</td>
-</tr>
-</tbody>
-</table>
-</blockquote>
-<p>As an example, we split the version string <cite>1.2c_pre12_alpha-r01.01-foo</cite> like this:</p>
-<blockquote>
-(first, &quot;1&quot;) (primary, &quot;2&quot;) (char, &quot;c&quot;) (pre, &quot;12&quot;) (alpha, &quot;&quot;) (revision, &quot;01&quot;) (inter_rev, &quot;01&quot;) (garbage, &quot;-foo&quot;)</blockquote>
-<p>To reconstruct a version string, iterate through the vector of parts,
-and for each part append a specific prefix and the value stored in the string.
-The prefixes you need should be obvious, but here they are listed anyway:</p>
-<blockquote>
-<table border="1" class="docutils">
-<colgroup>
-<col width="33%" />
-<col width="67%" />
-</colgroup>
-<thead valign="bottom">
-<tr><th class="head">Prefix</th>
-<th class="head">Name</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr><td>&quot;.&quot; (dot)</td>
-<td>primary, inter_rev</td>
-</tr>
-<tr><td>&quot;&quot; (empty)</td>
-<td>first, char, garbage</td>
-</tr>
-<tr><td>&quot;_alpha&quot;</td>
-<td>alpha</td>
-</tr>
-<tr><td>&quot;_beta&quot;</td>
-<td>beta</td>
-</tr>
-<tr><td>&quot;_pre&quot;</td>
-<td>pre</td>
-</tr>
-<tr><td>&quot;_rc&quot;</td>
-<td>rc</td>
-</tr>
-<tr><td>&quot;-r&quot;</td>
-<td>revision</td>
-</tr>
-<tr><td>&quot;_p&quot;</td>
-<td>patch</td>
-</tr>
-</tbody>
-</table>
-</blockquote>
-<table class="docutils footnote" frame="void" id="inter-revisions" rules="none">
-<colgroup><col class="label" /><col /></colgroup>
-<tbody valign="top">
-<tr><td class="label"><a class="fn-backref" href="#id2">[2]</a></td><td>inter-revision ares used by gentoo-alt to keep their prefixed portage tree in
-sync with the main tree
-<a class="reference external" href="http://www.gentoo.org/proj/en/gentoo-alt/prefix/techdocs.xml#doc_chap2_sect5">http://www.gentoo.org/proj/en/gentoo-alt/prefix/techdocs.xml#doc_chap2_sect5</a></td></tr>
-</tbody>
-</table>
-</div>
-</div>
-<div class="section" id="historical-notes">
-<h1>Historical notes</h1>
-<ul class="simple">
-<li>Since version 17, the format of this file is architecture-independent.</li>
-</ul>
-<!-- vim:set tw=100 ft=rst: -->
-</div>
-</div>
-</body>
-</html>