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Clarify chapter 7 stripping and backup

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In chapter 7 we do not need to unmount file systems to strip binaries.
Move unmounting to the backup/restore sections.

Also make sure the stripping commands are valid.
This commit is contained in:
Bruce Dubbs 2021-08-03 21:35:39 -05:00
parent adcaf07efb
commit c649743dd6
1 changed files with 29 additions and 25 deletions
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54
chapter07/stripping.xml
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@ -55,28 +55,27 @@
</para>
<para>
Leave the chroot environment and unmount the kernel virtual file
systems:
Now, if you are stripping installed files or making a backup,
leave the chroot environment:
</para>
<note>
<screen role="nodump"><userinput>exit</userinput></screen>
<important>
<para>All of the following instructions are executed by
<systemitem class="username">root</systemitem>. Take extra
care about the commands you're going to run as mistakes
here can modify your host system. Be aware that the
environment variable <envar>LFS</envar> is set for user
<systemitem class="username">lfs</systemitem> by default
but it might <emphasis>not</emphasis> be set for
environment variables <envar>LFS</envar> and <envar>LFS_TGT</envar>
are set for user <systemitem class="username">lfs</systemitem> by default
but may <emphasis>not</emphasis> be set for
<systemitem class="username">root</systemitem>. Whenever
commands are to be executed by <systemitem class="username">root</systemitem>,
make sure you have set <envar>LFS</envar> accordingly.
make sure you have set <envar>LFS</envar> and <envar>LFS_TGT</envar> accordingly.
This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
</para>
</note>
</important>
<screen role="nodump"><userinput>exit
umount $LFS/dev{/pts,}
umount $LFS/{sys,proc,run}</userinput></screen>
<sect2>
<title>Stripping</title>
@ -87,15 +86,15 @@ umount $LFS/{sys,proc,run}</userinput></screen>
symbols.</para>
<para>Strip off debugging symbols from binaries:</para>
<screen role="nodump"><userinput>$LFS_TGT-strip --strip-unneeded $LFS/usr/lib/*
$LFS_TGT-strip --strip-unneeded $LFS/usr/{,s}bin/*
$LFS_TGT-strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
<screen role="nodump"><userinput>cd $LFS/tools/$LFS_TGT
bin/strip --strip-unneeded $LFS/usr/lib/*
bin/strip --strip-unneeded $LFS/usr/{,s}bin/*
bin/strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
<para>These commands will skip a number of files reporting that it does not
recognize their file format. Most of these are scripts instead of binaries.
<!--Note that we use the <command>strip</command> program built in
<quote>Binutils pass 2</quote>, since it is the one that knows how to strip
our cross-compiled programs.--></para>
</para>
<para>At this point, you should have at least 5 GB of free space on the
chroot partition that can be used to build and install Glibc and GCC in
@ -125,14 +124,19 @@ $LFS_TGT-strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
<systemitem class="username">root</systemitem>.
</para>
<para>Before we make a backup, unmount the virtual file systems:</para>
<screen role="nodump"><userinput>umount $LFS/dev{/pts,}
umount $LFS/{sys,proc,run}</userinput></screen>
<para>
Create the backup archive by running the following command:
</para>
<screen role="nodump" revision="sysv"><userinput>cd $LFS &amp;&amp;
<screen role="nodump" revision="sysv"><userinput>cd $LFS
tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
<screen role="nodump" revision="systemd"><userinput>cd $LFS &amp;&amp;
<screen role="nodump" revision="systemd"><userinput>cd $LFS
tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
<para>
@ -158,12 +162,12 @@ tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
<!-- Make the following look different so users don't blindly run the
restore when they don't need to. -->
<screen role="nodump" revision="sysv"><computeroutput>cd $LFS &amp;&amp;
rm -rf ./* &amp;&amp;
<screen role="nodump" revision="sysv"><computeroutput>cd $LFS
rm -rf ./*
tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
<screen role="nodump" revision="systemd"><computeroutput>cd $LFS &amp;&amp;
rm -rf ./* &amp;&amp;
<screen role="nodump" revision="systemd"><computeroutput>cd $LFS
rm -rf ./*
tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
<para>
@ -173,8 +177,8 @@ tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
<important>
<para>
If you left the chroot environment either to strip off debug
symbols, create a backup, or restart building using a restore,
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