ebuild-writing/functions/pkg_preinst/text.xml


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<?xml version="1.0" encoding="UTF-8"?>
<guide self="ebuild-writing/functions/pkg_preinst/">
<chapter>
<title>pkg_preinst</title>

<body>
<table>
  <tr>
    <th>Function</th>
    <ti><c>pkg_preinst</c></ti>
  </tr>
  <tr>
    <th>Purpose</th>
    <ti>Called before image is installed to <c>${ROOT}</c></ti>
  </tr>
  <tr>
    <th>Sandbox</th>
    <ti>Disabled</ti>
  </tr>
  <tr>
    <th>Privilege</th>
    <ti>root</ti>
  </tr>
  <tr>
    <th>Called for</th>
    <ti>ebuild, binary</ti>
  </tr>
</table>
</body>

<section>
<title>Default <c>pkg_preinst</c></title>
<body>
<codesample lang="ebuild">
pkg_preinst() {
	return
}
</codesample>
</body>
</section>

<section>
<title>Sample <c>pkg_preinst</c></title>
<body>
<codesample lang="ebuild">
pkg_preinst() {
	enewgroup foo
	enewuser foo -1 /bin/false /dev/null foo
}
</codesample>
</body>
</section>

<section>
<title>Common <c>pkg_preinst</c> tasks</title>
<body>
<p>
There are a few things that are often done in <c>pkg_preinst</c>:
</p>

<ul>
  <li>
  Adding users and groups. However, since <c>pkg_preinst</c> may be called 
  after <c>src_compile</c>, <c>pkg_setup</c> is the more suitable location for
  user creation <d/> see <uri link="::ebuild-writing/users-and-groups/"/>.
  </li>
  <li>
  Modifying the install image for a particular system. This function
  allows system-specific customisation to be done even when installing
  from a binary. The most useful example is probably smart
  configuration file updating <d/> a <c>pkg_preinst</c> could check a
  configuration file in <c>${ROOT}/etc/</c> and create a smart updated
  version in <c>${D}/etc/</c> (see
  <uri link="::general-concepts/install-destinations/"/>) rather than
  always trying to install the default configuration file (remember
  <uri link="::general-concepts/config-protect/"/>).
  </li>
</ul>
</body>
</section>

</chapter>
</guide>