It is time to enter the chroot environment to begin building and
installing the final LFS system. As user
root, run the following command to enter the
realm that is, at the moment, populated with only the temporary
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
-i option given to the
env command will clear
all variables of the chroot environment. After that, only the
variables are set again. The
TERM=$TERM construct will set the
TERM variable inside chroot to the same
value as outside chroot. This variable is needed for programs like
vim and less to operate properly. If other
variables are needed, such as
CXXFLAGS, this is a good place to set them
From this point on, there is no need to use the
LFS variable anymore, because all work will be
restricted to the LFS file system. This is because the Bash shell is
$LFS is now the root
/tools/bin comes last in
PATH. This means that a temporary tool
will no longer be used once its final version is installed. This
occurs when the shell does not “remember” the
locations of executed binaries—for this reason, hashing is
switched off by passing the
+h option to bash.
Note that the bash
prompt will say
I have no name!
This is normal because the
file has not been created yet.
It is important that all the commands throughout the remainder of this chapter and the following chapters are run from within the chroot environment. If you leave this environment for any reason (rebooting for example), ensure that the virtual kernel filesystems are mounted as explained in Section 6.2.2, “Mounting and Populating /dev” and Section 6.2.3, “Mounting Virtual Kernel File Systems” and enter chroot again before continuing with the installation.