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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-partitioning-aboutlfs">
<?dbhtml filename="aboutlfs.html"?>
<title>Setting The $LFS Variable</title>
<para>Throughout this book, the environment variable <envar>LFS</envar> will
be used several times. You should ensure that this variable is always defined
throughout the LFS build process. It should be set to the name of the
directory where you will be building your LFS system - we will use
<filename class="directory">/mnt/lfs</filename> as an example, but you may
choose any directory name you want. If you are building LFS on a separate
partition, this directory will be the mount point for the partition.
Choose a directory location and set the variable with the
following command:</para>
<screen role="nodump"><userinput>export LFS=<replaceable>/mnt/lfs</replaceable></userinput></screen>
<para>Having this variable set is beneficial in that commands such as
<command>mkdir -v $LFS/tools</command> can be typed literally. The shell
will automatically replace <quote>$LFS</quote> with
<quote>/mnt/lfs</quote> (or whatever value the variable was set to) when it
processes the command line.</para>
<caution>
<para>Do not forget to check that <envar>LFS</envar> is set whenever
you leave and reenter the current working environment (such as when doing a
<command>su</command> to <systemitem class="username">root</systemitem> or
another user). Check that the <envar>LFS</envar> variable is set up
properly with:</para>
<screen role="nodump"><userinput>echo $LFS</userinput></screen>
<para>Make sure the output shows the path to your LFS system's build
location, which is <filename class="directory">/mnt/lfs</filename> if the
provided example was followed. If the output is incorrect, use the command
given earlier on this page to set <envar>$LFS</envar> to the correct
directory name.</para>
</caution>
<note><para>One way to ensure that the <envar>LFS</envar> variable is always
set is to edit the <filename>.bash_profile</filename> file in both your
personal home directory and in <filename>/root/.bash_profile</filename> and
enter the export command above. In addition, the shell specified in the
<filename>/etc/passwd</filename> file for all users that need the
<envar>LFS</envar> variable must be bash to ensure that the
<filename>/root/.bash_profile</filename> file is incorporated as a part of
the login process.</para>
<para>Another consideration is the method that is used to log into the
host system. If logging in through a graphical display manager, the
user's <filename>.bash_profile</filename> is not normally used when
a virtual terminal is started. In this case, add the export command to
the <filename>.bashrc</filename> file for the user and
<systemitem class="username">root</systemitem>. In addition,
some distributions use an "if" test, and do not run the remaining <filename>.bashrc</filename>
instructions for a non-interactive bash invocation. Be sure to place the
export command ahead of the test for non-interactive use.</para>
</note>
</sect1>
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