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
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14 | temporary system: first, the tools needed by the build machinery of
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15 | various packages, then three packages needed to run tests.
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16 | Now that all circular dependencies have been resolved,
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17 | we can use a <quote>chroot</quote> environment, completely isolated
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18 | from the computer used for the build, except 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>ls $LFS/dev</command>,
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25 | <command>ls $LFS/proc</command>, or <command>ls $LFS/sys</command>.
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26 | Note that mounting the virtual kernel file systems must be done
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27 | <emphasis>each time you want to enter the chroot
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28 | environment</emphasis>.</para>
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29 |
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30 | <para>Until <xref linkend="ch-tools-chroot"/>, the commands must be
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31 | run as <systemitem class="username">root</systemitem>, with the
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32 | <envar>LFS</envar> variable set. After entering chroot, all commands
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33 | are run as root, fortunately without access to the OS of the computer
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34 | you build LFS on. Be careful anyway, as it is easy to destroy the whole
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35 | LFS system with badly formed commands.</para>
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36 |
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37 | </sect1>
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