1 | <?xml version="1.0" encoding="UTF-8"?>
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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 | MAKEFLAGS="-j<replaceable>$(nproc)</replaceable>" \
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27 | TESTSUITEFLAGS="-j<replaceable>$(nproc)</replaceable>" \
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28 | /bin/bash --login</userinput></screen>
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29 |
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30 | <para>
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31 | If you don't want to use all available logical cores, replace
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32 | <replaceable>$(nproc)</replaceable> with the number of logical cores you
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33 | want to use for building packages in this chapter and the following
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34 | chapters. The test suites of some packages (notably Autoconf, Libtool,
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35 | and Tar) in &ch-final; are not affected by <envar>MAKEFLAGS</envar>, they
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36 | use a <envar>TESTSUITEFLAGS</envar> environment variable instead. We
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37 | set that here as well for running these test suites with multiple cores.
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38 | </para>
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39 |
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40 | <para>The <parameter>-i</parameter> option given to the <command>env</command>
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41 | command will clear all the variables in the chroot environment. After that, only
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42 | the <envar>HOME</envar>, <envar>TERM</envar>, <envar>PS1</envar>, and
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43 | <envar>PATH</envar> variables are set again. The
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44 | <parameter>TERM=$TERM</parameter> construct sets the <envar>TERM</envar>
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45 | variable inside chroot to the same value as outside chroot. This variable is
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46 | needed so programs like <command>vim</command> and <command>less</command>
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47 | can operate properly. If other variables are desired, such as
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48 | <envar>CFLAGS</envar> or <envar>CXXFLAGS</envar>, this is a good place to set
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49 | them.</para>
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50 |
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51 | <para>From this point on, there is no need to use the
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52 | <envar>LFS</envar> variable any more because all work will be restricted
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53 | to the LFS file system; the <command>chroot</command> command runs the
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54 | Bash shell with the root
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55 | (<filename class="directory">/</filename>) directory set to
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56 | <filename class='directory'>$LFS</filename>.</para>
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57 |
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58 | <para>Notice that <filename class="directory">/tools/bin</filename> is not
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59 | in the <envar>PATH</envar>. This means that the cross toolchain will no longer be
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60 | used.</para>
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61 |
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62 | <para>Also note that the <command>bash</command> prompt will say
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63 | <computeroutput>I have no name!</computeroutput> This is normal because the
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64 | <filename>/etc/passwd</filename> file has not been created yet.</para>
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65 |
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66 | <note>
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67 | <para>It is important that all the commands throughout the remainder of this
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68 | chapter and the following chapters are run from within the chroot
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69 | environment. If you leave this environment for any reason (rebooting for
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70 | example), ensure that the virtual kernel filesystems are mounted as
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71 | explained in <xref linkend="ch-tools-bindmount"/> and <xref
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72 | linkend="ch-tools-kernfsmount"/> and enter chroot again before continuing
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73 | with the installation.</para>
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74 | </note>
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75 |
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76 | </sect1>
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