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<?xml version="1.0" encoding="UTF-8"?>
<!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: the tools needed to build the various packages. Now
that all circular dependencies have been resolved, a <quote>chroot</quote>
environment, completely isolated from the host operating system (except for
the running kernel), can be used for the build.</para>
<para>For proper operation of the isolated environment, some communication
with the running kernel must be established. This is done via the
so-called <emphasis>Virtual Kernel File Systems</emphasis>, which will be
mounted before entering the chroot environment. You may want to verify
that they are mounted by issuing the <command>findmnt</command> 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 bad commands.</para>
</sect1>
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