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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<sect1 id="building_usb">
<?dbhtml filename="building.html"?>
<title>Building the USB live system</title>
<para>Creating the USB live system is quite easy. Either install your LFS/BLS system on the USB media, if you used a package manager, or copy your system to the USB media:</para>
<para>Because you're propably running the wanted system now, let's repeat a little part of the LFS book; create the directory structure</para>
<screen><userinput>mkdir -pv -m 755 $LFSMOUNT/{bin,boot,dev/{pts,shm},etc,home,include,lib,media,mnt,opt,proc,run,sbin,share,srv,sys,usr}
mkdir -pv -m 755 $LFSMOUNT/var/{opt,cache,lib/{misc,locate},local,log,mail,spool}
install -dv -m 0750 $LFSMOUNT/root
install -dv -m 1777 $LFSMOUNT/tmp $LFSMOUNT/var/tmp
ln -s /run $LFSMOUNT/var/run
ln -s /run/lock $LFSMOUNT/var/lock</userinput></screen>
<para>Make sure you have support for loopback device in your kernel:</para>
<screen><userinput>ls -l /dev | grep loop</userinput></screen>
<para>You should see a few /dev/loopX, where X is a number from 0 to 7. If this is not the case, and the loopback is supported as a kernel module, try to modprobe the module and retry again:</para>
<screen><userinput>modprobe loop
ls -l /dev | grep loop</userinput></screen>
<para>Udev populates /dev so copying /dev is not possible. Therefore create the basic device nodes:</para>
<screen><userinput>mknod -m 600 $LFSMOUNT/dev/console c 5 1
mknod -m 666 $LFSMOUNT/dev/null c 1 3
cp -av /dev/loop[0-7] $LFSMOUNT/dev/
mknod $LFSMOUNT/dev/ram0 b 1 0 </userinput></screen>
<para>Now copy the system:</para>
<screen><userinput>cp -av /bin /boot /etc /include /lib /opt /sbin /share /srv /usr $LFSMOUNT</userinput></screen>
<para>Modify mtab and fstab in etc</para>
<screen><userinput>echo "" > $LFSMOUNT/etc/mtab
echo "# Begin /etc/fstab" > $LFSMOUNT/etc/fstab
echo >> $LFSMOUNT/etc/fstab
echo "# file system mount-point type options dump fsck" >> $LFSMOUNT/etc/fstab
echo "# order" >> $LFSMOUNT/etc/fstab
echo >> $LFSMOUNT/etc/fstab
echo "LABEL=$LFSLIVE / ext3 defaults 1 1" >> $LFSMOUNT/etc/fstab
echo "proc /proc proc defaults 0 0" >> $LFSMOUNT/etc/fstab
echo "sysfs /sys sysfs defaults 0 0" >> $LFSMOUNT/etc/fstab
echo "devpts /dev/pts devpts gid=4,mode=620 0 0" >> $LFSMOUNT/etc/fstab
echo "tmpfs /run tmpfs defaults 0 0" >> $LFSMOUNT/etc/fstab
echo >> $LFSMOUNT/etc/fstab
echo "# End /etc/fstab" >> $LFSMOUNT/etc/fstab
</userinput></screen>
<para>Copy our previous created initrd.gz to /boot of the media.</para>
<screen><userinput>cp <PATH-TO-INITRD>/initrd.gz $LFSMOUNT/boot</userinput></screen>
<para></para>
</sect1>
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