mirror of
https://git.linuxfromscratch.org/lfs.git
synced 2025-03-05 22:04:48 +00:00
Rework cleaning up section of Chapter 7
Renamed chapter07/stripping.xml to chapter07/cleanup.xml Removed stripping from the end of Chapter 7. We suggest a 10 GB or larger partition in Section 2.4 - Creating a New Partition and the space used before cleaning up is only 3 GB. Stripping would free up about 300 MB more, but these files will soon be overwritten anyway. Remove /tools here to save about 1 GB. General reorginization and rewording. Chapter 8 stripping still needs to be updated after this change.
This commit is contained in:
Bruce Dubbs
parent
cf5da2558f
commit
02b26317cb
@ -31,6 +31,6 @@
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="dejagnu.xml"/>
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-->
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="stripping.xml"/>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cleanup.xml"/>
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</chapter>
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178
chapter07/cleanup.xml
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178
chapter07/cleanup.xml
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@ -0,0 +1,178 @@
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-tools-stripping">
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<?dbhtml filename="stripping.html"?>
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<title>Cleaning up and Saving the Temporary System</title>
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<sect2>
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<title>Cleaning</title>
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<para>First, remove the currently installed documentation to prevent them
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from ending up in the final system, and to save about 35 MB:</para>
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<screen><userinput>rm -rf /usr/share/{info,man,doc}/*</userinput></screen>
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<para>Second, the libtool .la files are only useful when linking with static
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libraries. They are unneeded and potentially harmful when using dynamic
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shared libraries, specially when using non-autotools build systems.
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While still in chroot, remove those files now:</para>
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<screen><userinput>find /usr/{lib,libexec} -name \*.la -delete</userinput></screen>
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<para>
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The current system size is now about 3 GB, however
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the /tools directory is no longer needed. It uses about
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1 GB of disk space. Delete it now:
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</para>
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<screen><userinput>rm -rf /tools</userinput></screen>
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</sect2>
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<sect2>
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<title>Backup</title>
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<note><para>
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All the remaining steps in this section are optional. Nevertheless,
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as soon as you begin installing packages in <xref
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linkend="chapter-building-system"/>, the temporary files will be
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overwritten. So it may be a good idea to do a backup of the current
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system as described below.
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</para></note>
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<para>
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The following steps are performed from outside the chroot
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environment. That means, you have to leave the chroot environment
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first before continuing. The reason for that is to
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get access to file system locations outside of the chroot
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environment to store/read the backup archive which should
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not be placed within the
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<filename class="directory">$LFS</filename> hierarchy for
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safety reasons.
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</para>
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<important>
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<para>All of the following instructions are executed by
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<systemitem class="username">root</systemitem>. Take extra
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care about the commands you're going to run as mistakes
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here can modify your host system. Be aware that the
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environment variable <envar>LFS</envar>
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is set for user <systemitem class="username">lfs</systemitem> by default
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but may <emphasis>not</emphasis> be set for
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<systemitem class="username">root</systemitem>. Whenever
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commands are to be executed by <systemitem class="username">root</systemitem>,
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make sure you have set <envar>LFS</envar>.
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This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
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</para>
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</important>
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<para>
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Now, if you are making a backup, leave the chroot environment:
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</para>
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<screen role="nodump"><userinput>exit</userinput></screen>
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<para>
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At this point the essential programs and libraries have been created
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and your current system is in a good state. Your system can now be
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backed up for later reuse. In case of fatal failures in the subsequent
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chapters, it often turns out that removing everything and starting over
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(more carefully) is the best option to recover. Unfortunately, all the
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the temporary files will be removed, too. To avoid spending extra time to
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redo something which has been built successfully, prepare a backup.
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</para>
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<para>
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Make sure you have at least 1 GB free disk space (the source tarballs
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will be included in the backup archive) in the home directory of user
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<systemitem class="username">root</systemitem>.
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</para>
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<para>Before we make a backup, unmount the virtual file systems:</para>
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<screen role="nodump"><userinput>umount $LFS/dev{/pts,}
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umount $LFS/{sys,proc,run}</userinput></screen>
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<para>
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Create the backup archive by running the following command:
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</para>
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<note>
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<para>
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Because the backup archive is compressed, it takes a relatively
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long time (over 10 minutes) even on a resonably fast system.
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</para>
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<para>
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Also, ensure the <envar>LFS</envar> environment variable is set
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for the root user.
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</para>
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</note>
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<screen role="nodump" revision="sysv"><userinput>cd $LFS
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tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
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<screen role="nodump" revision="systemd"><userinput>cd $LFS
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tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
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<para>
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Replace <envar>$HOME</envar> by a directory of your choice if you
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do not want to have the backup stored in <systemitem
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class="username">root</systemitem>'s home directory.
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</para>
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</sect2>
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<sect2>
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<title>Restore</title>
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<para>
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In case some mistakes have been made and you need to start over, you can
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use this backup to restore the system and save some recovery time.
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Since the sources are located under
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<filename class="directory">$LFS</filename>, they are included in the
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backup archive as well, so they do not need to be downloaded again. After
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checking that <envar>$LFS</envar> is set properly,
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restore the backup by executing the following commands:
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</para>
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<!-- Make the following look different so users don't blindly run the
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restore when they don't need to. -->
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<warning><para>The following commands are extremly dangerous. If
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you run <command>rm -rf ./*</command> as the root user and you
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do not change to the $LFS directory or the <envar>LFS</envar>
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environment variable is not set for the root user, it will destroy
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your entire host system. YOU ARE WARNED.</para></warning>
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<screen role="nodump" revision="sysv"><computeroutput>cd $LFS
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rm -rf ./*
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tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
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<screen role="nodump" revision="systemd"><computeroutput>cd $LFS
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rm -rf ./*
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tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
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<para>
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Again, double check that the environment has been setup properly
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and continue building the rest of the system.
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</para>
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<important>
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<para>
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If you left the chroot environment to create a backup or restart
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building using a restore, remember to check that the virtual
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filesystems are still mounted (<command>findmnt | grep
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$LFS</command>). If they are not mounted, remount them now as
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described in <xref linkend='ch-tools-kernfs'/> and re-enter the chroot
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environment (see <xref linkend='ch-tools-chroot'/>) before continuing.
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</para>
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</important>
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</sect2>
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</sect1>
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@ -1,199 +0,0 @@
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-tools-stripping">
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<?dbhtml filename="stripping.html"?>
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<title>Cleaning up and Saving the Temporary System</title>
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<para>The libtool .la files are only useful when linking with static
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libraries. They are unneeded, and potentially harmful, when using dynamic
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shared libraries, specially when using non-autotools build systems.
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While still in chroot, remove those files now:</para>
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<screen><userinput>find /usr/{lib,libexec} -name \*.la -delete</userinput></screen>
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<para>Remove the documentation of the temporary tools, to prevent them
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from ending up in the final system, and save about 35 MB:</para>
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<screen><userinput>rm -rf /usr/share/{info,man,doc}/*</userinput></screen>
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<note><para>
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All the remaining steps in this section are optional. Nevertheless,
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as soon as you begin installing packages in <xref
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linkend="chapter-building-system"/>, the temporary tools will be
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overwritten. So it may be a good idea to do a backup of the temporary
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tools as described below. The other steps are only needed if you are
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really short on disk space.
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</para></note>
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<para>
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The following steps are performed from outside the chroot
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environment. That means, you have to leave the chroot environment
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first before continuing. The reason for that is to:
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<itemizedlist>
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<listitem>
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<para>
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make sure that objects are not in use while they are
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manipulated.
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</para>
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</listitem>
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<listitem>
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<para>
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get access to file system locations outside of the chroot
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environment to store/read the backup archive which should
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not be placed within the
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<filename class="directory">$LFS</filename> hierarchy for
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safety reasons.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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<para>
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Now, if you are stripping installed files or making a backup,
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leave the chroot environment:
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</para>
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<screen role="nodump"><userinput>exit</userinput></screen>
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<important>
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<para>All of the following instructions are executed by
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<systemitem class="username">root</systemitem>. Take extra
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care about the commands you're going to run as mistakes
|
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here can modify your host system. Be aware that the
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environment variables <envar>LFS</envar> and <envar>LFS_TGT</envar>
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are set for user <systemitem class="username">lfs</systemitem> by default
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but may <emphasis>not</emphasis> be set for
|
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<systemitem class="username">root</systemitem>. Whenever
|
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commands are to be executed by <systemitem class="username">root</systemitem>,
|
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make sure you have set <envar>LFS</envar> and <envar>LFS_TGT</envar> accordingly.
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This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
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</para>
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</important>
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<sect2>
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<title>Stripping</title>
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<para>If the LFS partition is rather small, it is good to
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know that unnecessary items can be removed. The executables and
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libraries built so far contain a little over 90 MB of unneeded debugging
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symbols.</para>
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<para>Strip off debugging symbols from binaries:</para>
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<screen role="nodump"><userinput>cd $LFS/tools/$LFS_TGT
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bin/strip --strip-unneeded $LFS/usr/lib/*
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bin/strip --strip-unneeded $LFS/usr/{,s}bin/*
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bin/strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
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<para>These commands will skip a number of files reporting that it does not
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recognize their file format. Most of these are scripts instead of binaries.
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</para>
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<para>At this point, you should have at least 5 GB of free space on the
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chroot partition that can be used to build and install Glibc and GCC in
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the next phase. If you can build and install Glibc, you can build and install
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the rest too. You can check the free disk space with the command
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<command>df -h $LFS</command>.</para>
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</sect2>
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<sect2>
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<title>Backup</title>
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<para>
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Now that the essential tools have been created, its time to think about
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a backup. When every check has passed successfully in the previously
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built packages, your temporary tools are in a good state and might be
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backed up for later reuse. In case of fatal failures in the subsequent
|
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chapters, it often turns out that removing everything and starting over
|
||||
(more carefully) is the best option to recover. Unfortunately, all the
|
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temporary tools will be removed, too. To avoid spending extra time to
|
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redo something which has been built successfully, prepare a backup.
|
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</para>
|
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<para>
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Make sure you have at least 600 MB free disk space (the source tarballs
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will be included in the backup archive) in the home directory of user
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<systemitem class="username">root</systemitem>.
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</para>
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<para>Before we make a backup, unmount the virtual file systems:</para>
|
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<screen role="nodump"><userinput>umount $LFS/dev{/pts,}
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umount $LFS/{sys,proc,run}</userinput></screen>
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<para>
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Create the backup archive by running the following command:
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</para>
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<screen role="nodump" revision="sysv"><userinput>cd $LFS
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tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
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<screen role="nodump" revision="systemd"><userinput>cd $LFS
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tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
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<para>
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Replace <envar>$HOME</envar> by a directory of your choice if you
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do not want to have the backup stored in <systemitem
|
||||
class="username">root</systemitem>'s home directory.
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</para>
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</sect2>
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<sect2>
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<title>Restore</title>
|
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<para>
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In case some mistakes have been made and you need to start over, you can
|
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use this backup to restore the temporary tools and save some recovery time.
|
||||
Since the sources are located under
|
||||
<filename class="directory">$LFS</filename>, they are included in the
|
||||
backup archive as well, so they do not need to be downloaded again. After
|
||||
checking that <envar>$LFS</envar> is set properly,
|
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restore the backup by executing the following commands:
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</para>
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<!-- Make the following look different so users don't blindly run the
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restore when they don't need to. -->
|
||||
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<warning><para>The following commands are extremly dangerous. If
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you run <command>rm -rf ./*</command> as the root user and you
|
||||
do not change to the $LFS directory or the <envar>LFS</envar>
|
||||
environment variable is not set for the root user, it will destroy
|
||||
your entire host system. YOU ARE WARNED.</para></warning>
|
||||
|
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<screen role="nodump" revision="sysv"><computeroutput>cd $LFS
|
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rm -rf ./*
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tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
|
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<screen role="nodump" revision="systemd"><computeroutput>cd $LFS
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rm -rf ./*
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tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
|
||||
|
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<para>
|
||||
Again, double check that the environment has been setup properly
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and continue building the rest of the system.
|
||||
</para>
|
||||
|
||||
<important>
|
||||
<para>
|
||||
If you left the chroot environment
|
||||
to create a backup or restart building using a restore,
|
||||
remember to check that the virtual filesystems are still
|
||||
mounted (<command>findmnt | grep $LFS</command>).
|
||||
If they are not mounted, remount them now as
|
||||
described in <xref linkend='ch-tools-kernfs'/> and re-enter
|
||||
the chroot environment (see <xref linkend='ch-tools-chroot'/>)
|
||||
before continuing.
|
||||
</para>
|
||||
</important>
|
||||
|
||||
</sect2>
|
||||
|
||||
</sect1>
|
||||
Loading…
Reference in New Issue
Block a user