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Diffstat (limited to 'chapter06/chroot.xml')
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diff --git a/chapter06/chroot.xml b/chapter06/chroot.xml index 9ef1cca3e..c9afcdc13 100644 --- a/chapter06/chroot.xml +++ b/chapter06/chroot.xml @@ -7,11 +7,55 @@ <title>Entering the Chroot Environment</title> <?dbhtml filename="chroot.html"?> -<para>Enter the chroot environment:</para> +<para>It is time to enter the chroot environment to begin +building and installing the final LFS system. As user +<emphasis>root</emphasis>, run the following command to enter the +realm that is, at the moment, populated with only the temporary +tools:</para> <screen><userinput>chroot "$LFS" /tools/bin/env -i \ HOME=/root TERM="$TERM" PS1='\u:\w\$ ' \ PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \ /tools/bin/bash --login +h</userinput></screen> +<para>The <parameter>-i</parameter> option given to the +<command>env</command> command will clear all variables of the chroot +environment. After that, only the <envar>HOME</envar>, +<envar>TERM</envar>, <envar>PS1</envar>, and +<envar>PATH</envar> variables are set again. The +<parameter>TERM=$TERM</parameter> construct will set the +<envar>TERM</envar> variable inside chroot to the same value as +outside chroot. This variable is needed for programs like +<command>vim</command> and <command>less</command> to operate +properly. If other variables are needed, such as +<envar>CFLAGS</envar> or <envar>CXXFLAGS</envar>, this is +a good place to set them again.</para> + +<para>From this point on, there is no need to use the +<envar>LFS</envar> variable anymore, because all work will be +restricted to the LFS file system. This is because the Bash shell is +told that <filename class="directory">$LFS</filename> is now the root +(<filename class="directory">/</filename>) directory.</para> + +<para>Notice that <filename class="directory">/tools/bin</filename> +comes last in the <envar>PATH</envar>. This means that a +temporary tool will not be used anymore as soon as its final version +is installed. This occurs when the shell does not <quote>remember</quote> the +locations of executed binaries—for this reason, hashing is switched +off by passing the <parameter>+h</parameter> option to <command>bash</command>.</para> + +<para>It is important that all the commands throughout the remainder +of this chapter and the following chapters be run from within the +chroot environment. If you leave this environment for any reason +(rebooting for example), remember to first mount the <systemitem +class="filesystem">proc</systemitem> and <systemitem +class="filesystem">devpts</systemitem> file systems (discussed in the +previous section) and enter chroot again before continuing with the +installations.</para> + +<para>Note that the bash prompt will say <quote>I have no +name!</quote> This is normal because the +<filename>/etc/passwd</filename> file has not been created yet.</para> + </sect1> + |