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- <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
- <!ENTITY % general-entities SYSTEM "../general.ent">
- %general-entities;
- ]>
- <sect1 id="ch-tools-introduction-chroot">
- <?dbhtml filename="introduction.html"?>
- <title>Introduction</title>
- <para>This chapter shows how to build the last missing bits of the temporary
- system: first, the tools needed by the build machinery of various packages,
- then three packages needed to run tests. Now that all circular dependencies
- have been resolved, we can use a <quote>chroot</quote> environment,
- completely isolated the host operating system used for the build, except
- for the running kernel.</para>
- <para>For proper operation of the isolated environment, some communication
- with the running kernel must be established. This is done through the
- so-called <emphasis>Virtual Kernel File Systems</emphasis>, which must be
- mounted when entering the chroot environment. You may want to check
- that they are mounted by issuing <command>findmnt</command>.</para>
- <para>Until <xref linkend="ch-tools-chroot"/>, the commands must be
- run as <systemitem class="username">root</systemitem>, with the
- <envar>LFS</envar> variable set. After entering chroot, all commands
- are run as root, fortunately without access to the OS of the computer
- you built LFS on. Be careful anyway, as it is easy to destroy the whole
- LFS system with badly formed commands.</para>
- </sect1>
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