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<?xml version="1.0" encoding="ISO-8859-1"?>
<!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 by the build machinery of various packages.
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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