AUTHOR: youbest <youbest at sina dot com>

TRANSLATOR: d00m3d <d00m3d at sina dot com>

DATE: 2006-02-16

LICENSE: GNU Free Documentation License Version 2

SYNOPSIS: How to resume your work after a break at different LFS stages.

DESCRIPTION: This hint helps you setting up your building environment at 
different stages. LFS LiveCD is used as the host system.

PRIMARY URI: http://www.linuxsir.org/bbs/showthread.php?t=242880

PREREQUISITES: LFS LiveCD-6.1.1-3

HINT:

Foreword
========
For those who have built their own LFS systems more than once, they must 
be very "impressed" with the extremely long building time. In 
particular, if the computer is not a powerful one. It is quite scary to 
learn about such lengthy building time.

Sometimes, you may be forced to shutdown or reboot the computer, which 
you have to resume your previous working conditions before continuing 
the job. However, this process would be quite confusing to those who are 
not familiar with the principles of LFS and they are likely to have 
difficulties in resuming their previous building environment. To avoid 
this from happening, they often keep the computer running for several 
days until the whole LFS is finished.

Thus it is very useful to know how to have a smooth connection after a 
reboot/shutdown. Based on my own experiences I did a research on this 
topic and would like to share my results. Every steps are carefully 
verified and should be correct. Hope this hint may assist those who are 
building their own LFS system and relief some of their "pains".

Throughout the article, sda is block device being used. sda1 is being 
used as swap and sda2 is the partition for building LFS.

The following procedures are based on LFS6.1.1-3. If a different book 
version is used, the section number may be different as well, please 
refer to the sub-heading of each section in such case.

 From beginning to Section 4.4 Setting up the Environment
========================================================
You may simply restart the process from the very beginning.

 From section 4.5 About SBUs to section 5.33 Stripping
=====================================================
Following are the steps you need if you stop in any section from 
4.5(About SBUs) and 5.33 (Stripping).
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Establish symbolic link for toolchain
        ln -sv $LFS/tools /
5. Create lfs account
        groupadd lfs
        useradd -s /bin/bash -g lfs -m -k /dev/null lfs
        passwd lfs
        chown -v lfs $LFS/tools
        chown -v lfs $LFS/sources
        su - lfs
6. Define the lfs user profile
        cat > ~/.bash_profile << "EOF"
        exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash
        EOF

        cat > ~/.bashrc << "EOF"
        set +h
        umask 022
        LFS=/mnt/lfs
        LC_ALL=POSIX
        PATH=/tools/bin:/bin:/usr/bin
        export LFS LC_ALL PATH
        EOF

        source ~/.bash_profile
7. Verify the environment variables
        export //the export command should output the following:
        declare -x HOME="/home/lfs"
        declare -x LC_ALL="POSIX"
        declare -x LFS="/mnt/lfs"
        declare -x OLDPWD
        declare -x PATH="/tools/bin:/bin:/usr/bin"
        declare -x PS1="\\u:\\w\\\$ "
        declare -x PWD="/home/lfs"
        declare -x SHLVL="1"
        declare -x TERM="linux"
If you get these variables correct, then you have already resumed your 
building environment.

Section 6.1 Introduction
========================
At this point, you are probably tired and prefer to shutdown your 
computer for a rest. Steps to resume the building environment are:
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
Note:
At this point, the toolchain is ready and existed in /tools, thus there 
is no need to create a symbolic link for the /tools directory again.

 From section 6.2. Mounting Virtual Kernel File Systems to section 6.8. 
Populating /dev
======================================================================================
At this point, if you reboot or shutdown your computer. Steps to resume 
the building environment are:
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot "$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

 From section 6.9. Linux-Libc-Headers-2.6.11.2 to section 6.37. Bash-3.0
=======================================================================
Following are the commands you need if you stop at any sections between 
6.9 (Linux-Libc-Headers) and 6.37 (Bash-3.0).
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot "$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
6. Populating /dev
        mount -nvt tmpfs none /dev
        mknod -m 622 /dev/console c 5 1
        mknod -m 666 /dev/null c 1 3
        mknod -m 666 /dev/zero c 1 5
        mknod -m 666 /dev/ptmx c 5 2
        mknod -m 666 /dev/tty c 5 0
        mknod -m 444 /dev/random c 1 8
        mknod -m 444 /dev/urandom c 1 9
        chown -v root:tty /dev/{console,ptmx,tty}
        ln -sv /proc/self/fd /dev/fd
        ln -sv /proc/self/fd/0 /dev/stdin
        ln -sv /proc/self/fd/1 /dev/stdout
        ln -sv /proc/self/fd/2 /dev/stderr
        ln -sv /proc/kcore /dev/core
        mkdir -v /dev/pts
        mkdir -v /dev/shm
        mount -vt devpts -o gid=4,mode=620 none /dev/pts
        mount -vt tmpfs none /dev/shm
7. Entering your working directory
        cd /sources

 From 6.38. File-4.13 to section 6.58. Udev-056
==============================================
Following are the commands you need if you stop at any sections between 
6.37 (Bash-3.0) and 6.58 (Udev-056)
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot "$LFS" /tools/bin/env -i \
        HOME=/root TERM="$TERM" PS1='\u:\w\$ ' \
         PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \
        /bin/bash --login +h
6. Populating /dev
        mount -nvt tmpfs none /dev
        mknod -m 622 /dev/console c 5 1
        mknod -m 666 /dev/null c 1 3
        mknod -m 666 /dev/zero c 1 5
        mknod -m 666 /dev/ptmx c 5 2
        mknod -m 666 /dev/tty c 5 0
        mknod -m 444 /dev/random c 1 8
        mknod -m 444 /dev/urandom c 1 9
        chown -v root:tty /dev/{console,ptmx,tty}
        ln -sv /proc/self/fd /dev/fd
        ln -sv /proc/self/fd/0 /dev/stdin
        ln -sv /proc/self/fd/1 /dev/stdout
        ln -sv /proc/self/fd/2 /dev/stderr
        ln -sv /proc/kcore /dev/core
        mkdir -v /dev/pts
        mkdir -v /dev/shm
        mount -vt devpts -o gid=4,mode=620 none /dev/pts
        mount -vt tmpfs none /dev/shm
7. Entering your working directory
        cd /sources

 From section 6.59. Util-linux-2.12q to section 6.60. About Debugging 
Symbols
============================================================================
Following are the commands you need if you stop at 6.59 
(Util-linux-2.12q) or 6.60 (About Debugging Symbols).
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot "$LFS" /tools/bin/env -i \
        HOME=/root TERM="$TERM" PS1='\u:\w\$ ' \
         PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \
        /bin/bash --login +h
6. Populating /dev
        mount -nvt tmpfs none /dev
        /sbin/udevstart
        mkdir -v /dev/pts
        mkdir -v /dev/shm
        mount -vt devpts -o gid=4,mode=620 none /dev/pts
        mount -vt tmpfs none /dev/shm
7. Entering your working directory
        cd /sources

Section 6.61. Stripping Again
=============================
If you reboot your system at this moment, steps to resume the building 
environment are:
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot $LFS /tools/bin/env -i \
        HOME=/root TERM=$TERM PS1='\u:\w\$ ' \
        PATH=/bin:/usr/bin:/sbin:/usr/sbin \
        /tools/bin/bash --login
6. Populating /dev
        mount -nvt tmpfs none /dev
        /sbin/udevstart
        mkdir -v /dev/pts
        mkdir -v /dev/shm
        mount -vt devpts -o gid=4,mode=620 none /dev/pts
        mount -vt tmpfs none /dev/shm
7. Entering your working directory
        cd /sources

 From section 6.62. Cleaning Up to The End
=========================================
 From this point till the end of the whole LFS build. Steps to resume 
the building
environment are:
1. Restart computer and boot from LiveCD
2. Mount your lfs partition
        export LFS=/mnt/lfs
        mkdir -pv $LFS
        mount /dev/sda2 $LFS
3. Mount your swap partition (skip this step if you do not use any swap 
partitions)
        swapon /dev/sda1
4. Mount the virtual kernel filesystems
        mount -vt proc proc $LFS/proc
        mount -vt sysfs sysfs $LFS/sys
5. Entering the chroot environment
        chroot "$LFS" /usr/bin/env -i \
        HOME=/root TERM="$TERM" PS1='\u:\w\$ ' \
         PATH=/bin:/usr/bin:/sbin:/usr/sbin \
        /bin/bash --login
6. Populating /dev
        mount -nvt tmpfs none /dev
        /sbin/udevstart
        mkdir -v /dev/pts
        mkdir -v /dev/shm
        mount -vt devpts -o gid=4,mode=620 none /dev/pts
        mount -vt tmpfs none /dev/shm
7. Entering your working directory
        cd /sources


CHANGELOG:

1.0. Initial Version
1.1. Email address correction.
      Description improvement.


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