7.13. Cleaning up and Saving the Temporary System

7.13.1. Cleaning

First, remove the currently installed documentation files to prevent them from ending up in the final system, and to save about 35 MB:

rm -rf /usr/share/{info,man,doc}/*

Second, on a modern Linux system, the libtool .la files are only useful for libltdl. No libraries in LFS are loaded by libltdl, and it's known that some .la files can cause BLFS package failures. Remove those files now:

find /usr/{lib,libexec} -name \*.la -delete

The current system size is now about 3 GB, however the /tools directory is no longer needed. It uses about 1 GB of disk space. Delete it now:

rm -rf /tools

7.13.2. Backup

At this point the essential programs and libraries have been created and your current LFS system is in a good state. Your system can now be backed up for later reuse. In case of fatal failures in the subsequent chapters, it often turns out that removing everything and starting over (more carefully) is the best way to recover. Unfortunately, all the temporary files will be removed, too. To avoid spending extra time to redo something which has been done successfully, creating a backup of the current LFS system may prove useful.

The following steps are performed from outside the chroot environment. That means you have to leave the chroot environment first before continuing. The reason for that is to get access to file system locations outside of the chroot environment to store/read the backup archive, which ought not be placed within the $LFS hierarchy.

If you have decided to make a backup, leave the chroot environment:

exit

Before making a backup, unmount the virtual file systems:

mountpoint -q $LFS/dev/shm && umount $LFS/dev/shm
umount $LFS/dev/pts
umount $LFS/{sys,proc,run,dev}

Make sure you have at least 1 GB free disk space (the source tarballs will be included in the backup archive) on the file system containing the directory where you create the backup archive.

Note that the instructions below specify the home directory of the host system's root user, which is typically found on the root file system. Replace $HOME by a directory of your choice if you do not want to have the backup stored in root's home directory.

Create the backup archive by running the following command:

cd $LFS
tar -cJpf $HOME/lfs-temp-tools-loongarch-12.1-systemd.tar.xz .

7.13.3. Restore

In case some mistakes have been made and you need to start over, you can use this backup to restore the system and save some recovery time. Since the sources are located under $LFS, they are included in the backup archive as well, so they do not need to be downloaded again. After checking that $LFS is set properly, you can restore the backup by executing the following commands:

cd $LFS
rm -rf ./*
tar -xpf $HOME/lfs-temp-tools-loongarch-12.1-systemd.tar.xz

Again, double check that the environment has been set up properly and continue building the rest of the system.