| 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-chroot">
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| 9 | <?dbhtml filename="chroot.html"?>
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| 10 |
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| 11 | <title>Entering the Chroot Environment</title>
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| 12 |
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| 13 | <para>Now that all the packages which are required to build the rest of the
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| 14 | needed tools are on the system, it is time to enter the chroot environment and
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| 15 | finish installing the temporary tools. This environment will also be
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| 16 | used to install the final system. As user <systemitem
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| 17 | class="username">root</systemitem>, run the following command to enter the
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| 18 | environment that is, at the moment, populated with nothing but temporary
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| 19 | tools:</para>
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| 20 |
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| 21 | <screen role="nodump"><userinput>chroot "$LFS" /usr/bin/env -i \
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| 22 | HOME=/root \
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| 23 | TERM="$TERM" \
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| 24 | PS1='(lfs chroot) \u:\w\$ ' \
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| 25 | PATH=/usr/bin:/usr/sbin \
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| 26 | /bin/bash --login</userinput></screen>
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| 27 |
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| 28 | <para>The <parameter>-i</parameter> option given to the <command>env</command>
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| 29 | command will clear all the variables in the chroot environment. After that, only
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| 30 | the <envar>HOME</envar>, <envar>TERM</envar>, <envar>PS1</envar>, and
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| 31 | <envar>PATH</envar> variables are set again. The
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| 32 | <parameter>TERM=$TERM</parameter> construct sets the <envar>TERM</envar>
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| 33 | variable inside chroot to the same value as outside chroot. This variable is
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| 34 | needed so programs like <command>vim</command> and <command>less</command>
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| 35 | can operate properly. If other variables are desired, such as
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| 36 | <envar>CFLAGS</envar> or <envar>CXXFLAGS</envar>, this is a good place to set
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| 37 | them.</para>
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| 38 |
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| 39 | <para>From this point on, there is no need to use the
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| 40 | <envar>LFS</envar> variable any more because all work will be restricted
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| 41 | to the LFS file system; the <command>chroot</command> command tells the Bash shell that
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| 42 | <filename class="directory">$LFS</filename> is now the root
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| 43 | (<filename class="directory">/</filename>) directory.</para>
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| 44 |
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| 45 | <para>Notice that <filename class="directory">/tools/bin</filename> is not
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| 46 | in the <envar>PATH</envar>. This means that the cross toolchain will no longer be
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| 47 | used.</para>
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| 48 |
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| 49 | <para>Note that the <command>bash</command> prompt will say
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| 50 | <computeroutput>I have no name!</computeroutput> This is normal because the
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| 51 | <filename>/etc/passwd</filename> file has not been created yet.</para>
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| 52 |
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| 53 | <note>
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| 54 | <para>It is important that all the commands throughout the remainder of this
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| 55 | chapter and the following chapters are run from within the chroot
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| 56 | environment. If you leave this environment for any reason (rebooting for
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| 57 | example), ensure that the virtual kernel filesystems are mounted as
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| 58 | explained in <xref linkend="ch-tools-bindmount"/> and <xref
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| 59 | linkend="ch-tools-kernfsmount"/> and enter chroot again before continuing
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| 60 | with the installation.</para>
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| 61 | </note>
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| 62 |
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| 63 | </sect1>
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