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