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-partitioning-aboutlfs">
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9 | <?dbhtml filename="aboutlfs.html"?>
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10 |
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11 | <title>Setting The $LFS Variable</title>
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12 |
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13 | <para>Throughout this book, the environment variable <envar>LFS</envar> will
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14 | be used several times. You should ensure that this variable is always defined
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15 | throughout the LFS build process. It should be set to the name of the
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16 | directory where you will be building your LFS system - we will use
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17 | <filename class="directory">/mnt/lfs</filename> as an example, but the
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18 | choose any directory name you want. Choose a directory location and set the
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19 | variable with the following command:</para>
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20 |
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21 | <screen role="nodump"><userinput>export LFS=<replaceable>/mnt/lfs</replaceable></userinput></screen>
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22 |
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23 | <para>Having this variable set is beneficial in that commands such as
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24 | <command>mkdir -v $LFS/tools</command> can be typed literally. The shell
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25 | will automatically replace <quote>$LFS</quote> with
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26 | <quote>/mnt/lfs</quote> (or whatever value the variable was set to) when it
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27 | processes the command line.</para>
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28 |
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29 | <para>Create the directory:</para>
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30 |
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31 | <screen role="nodump"><userinput>mkdir -pv $LFS</userinput></screen>
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32 |
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33 | <para>If you don't have much space in the partition holding the directory,
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34 | you can mount another partition on it.</para>
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35 |
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36 | <caution>
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37 | <para>Do not forget to check that <envar>LFS</envar> is set whenever
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38 | you leave and reenter the current working environment (such as when doing a
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39 | <command>su</command> to <systemitem class="username">root</systemitem> or
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40 | another user). Check that the <envar>LFS</envar> variable is set up
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41 | properly with:</para>
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42 |
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43 | <screen role="nodump"><userinput>echo $LFS</userinput></screen>
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44 |
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45 | <para>Make sure the output shows the path to your LFS system's build
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46 | location, which is <filename class="directory">/mnt/lfs</filename> if the
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47 | provided example was followed. If the output is incorrect, use the command
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48 | given earlier on this page to set <envar>$LFS</envar> to the correct
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49 | directory name.</para>
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50 | </caution>
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51 |
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52 | <note><para>One way to ensure that the <envar>LFS</envar> variable is always
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53 | set is to edit the <filename>.bash_profile</filename> file in both your
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54 | personal home directory and in <filename>/root/.bash_profile</filename> and
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55 | enter the export command above. In addition, the shell specified in the
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56 | <filename>/etc/passwd</filename> file for all users that need the
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57 | <envar>LFS</envar> variable must be bash to ensure that the
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58 | <filename>/root/.bash_profile</filename> file is incorporated as a part of
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59 | the login process.</para>
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60 |
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61 | <para>Another consideration is the method that is used to log into the
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62 | host system. If logging in through a graphical display manager, the
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63 | user's <filename>.bash_profile</filename> is not normally used when
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64 | a virtual terminal is started. In this case, add the export command to
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65 | the <filename>.bashrc</filename> file for the user and
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66 | <systemitem class="username">root</systemitem>. In addition,
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67 | some distributions use an "if" test, and do not run the remaining <filename>.bashrc</filename>
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68 | instructions for a non-interactive bash invocation. Be sure to place the
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69 | export command ahead of the test for non-interactive use.</para>
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70 |
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71 | </note>
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72 |
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73 | </sect1>
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