source: chapter07/introduction.xml@ aefc822

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Last change on this file since aefc822 was 387a32af, checked in by Bruce Dubbs <bdubbs@…>, 2 years ago

Update initial Chapter 7 pages for cross2 branch

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[673b0d8]1<?xml version="1.0" encoding="ISO-8859-1"?>
[b06ca36]2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
[673b0d8]4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
[d781ffb]7
[ce335792]8<sect1 id="ch-tools-introduction-chroot">
[d781ffb]9 <?dbhtml filename="introduction.html"?>
[673b0d8]10
[d781ffb]11 <title>Introduction</title>
[81fd230]12
[387a32af]13 <para>This chapter shows how to build the last missing bits of the temporary
14 system: first, the tools needed by the build machinery of various packages,
15 then three packages needed to run tests. Now that all circular dependencies
16 have been resolved, we can use a <quote>chroot</quote> environment,
17 completely isolated the host operating system used for the build, except
18 for the running kernel.</para>
[ce335792]19
20 <para>For proper operation of the isolated environment, some communication
21 with the running kernel must be established. This is done through the
22 so-called <emphasis>Virtual Kernel File Systems</emphasis>, which must be
23 mounted when entering the chroot environment. You may want to check
[387a32af]24 that they are mounted by issuing <command>findmnt</command>.</para>
[ce335792]25
26 <para>Until <xref linkend="ch-tools-chroot"/>, the commands must be
27 run as <systemitem class="username">root</systemitem>, with the
28 <envar>LFS</envar> variable set. After entering chroot, all commands
29 are run as root, fortunately without access to the OS of the computer
[387a32af]30 you built LFS on. Be careful anyway, as it is easy to destroy the whole
[ce335792]31 LFS system with badly formed commands.</para>
[cba2d4e]32
[d781ffb]33</sect1>
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