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+ margin-left: 1px } + +table.docinfo { + margin: 2em 4em } + +table.docutils { + margin-top: 0.5em ; + margin-bottom: 0.5em } + +table.footnote { + border-left: solid 1px black; + margin-left: 1px } + +table.docutils td, table.docutils th, +table.docinfo td, table.docinfo th { + padding-left: 0.5em ; + padding-right: 0.5em ; + vertical-align: top } + +table.docutils th.field-name, table.docinfo th.docinfo-name { + font-weight: bold ; + text-align: left ; + white-space: nowrap ; + padding-left: 0 } + +h1 tt.docutils, h2 tt.docutils, h3 tt.docutils, +h4 tt.docutils, h5 tt.docutils, h6 tt.docutils { + font-size: 100% } + +ul.auto-toc { + list-style-type: none } + +</style> +</head> +<body> +<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 <vaeth AT mathematik DOT uni-wuerzburg DOT de> (active) +<br />Emil Beinroth <emilbeinroth AT gmx DOT net> (active) +<br />Wolfgang Frisch <xororand AT users DOT sourceforge DOT net> (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 "Provide"</td> +</tr> +<tr><td>Hash</td> +<td>Hash for "Licenses"</td> +</tr> +<tr><td>Hash</td> +<td>Hash for "Keywords"</td> +</tr> +<tr><td>Hash</td> +<td>Hash for "Useflags"</td> +</tr> +<tr><td>Hash</td> +<td>Hash for "Slot"</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 @) 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 "falsely" 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 @system</td> +</tr> +<tr class="field"><th class="field-name">0x08:</th><td class="field-body">version is in @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 "0" is stored as "".</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 "falsely" 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 "<a class="reference internal" href="#string">string</a>" (referred to as <em>value</em>).</p> +<p>The number is encoded in the lower 5 bits of the length-part of the "<a class="reference internal" href="#string">string</a>"; +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 "_alpha" (may be empty)</td> +</tr> +<tr><td>2</td> +<td><cite>beta</cite></td> +<td>number of "_beta" (may be empty)</td> +</tr> +<tr><td>3</td> +<td><cite>pre</cite></td> +<td>number of "_pre" (may be empty)</td> +</tr> +<tr><td>4</td> +<td><cite>rc</cite></td> +<td>number of "_rc" (may be empty)</td> +</tr> +<tr><td>5</td> +<td><cite>revision</cite></td> +<td>number of "-r" (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 "_p" (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, "1") (primary, "2") (char, "c") (pre, "12") (alpha, "") (revision, "01") (inter_rev, "01") (garbage, "-foo")</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>"." (dot)</td> +<td>primary, inter_rev</td> +</tr> +<tr><td>"" (empty)</td> +<td>first, char, garbage</td> +</tr> +<tr><td>"_alpha"</td> +<td>alpha</td> +</tr> +<tr><td>"_beta"</td> +<td>beta</td> +</tr> +<tr><td>"_pre"</td> +<td>pre</td> +</tr> +<tr><td>"_rc"</td> +<td>rc</td> +</tr> +<tr><td>"-r"</td> +<td>revision</td> +</tr> +<tr><td>"_p"</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> |