[02b2631] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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[8a269ec] | 8 | <sect1 id="ch-tools-cleanup">
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| 9 | <?dbhtml filename="cleanup.html"?>
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[02b2631] | 10 |
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| 11 | <title>Cleaning up and Saving the Temporary System</title>
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[2c8fdfc] | 12 |
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[02b2631] | 13 | <sect2>
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| 14 | <title>Cleaning</title>
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| 15 |
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| 16 | <para>First, remove the currently installed documentation to prevent them
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| 17 | from ending up in the final system, and to save about 35 MB:</para>
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| 18 |
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| 19 | <screen><userinput>rm -rf /usr/share/{info,man,doc}/*</userinput></screen>
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| 20 |
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[3d65730e] | 21 | <para>Second, on a modern Linux system, the libtool .la files are only
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| 22 | useful for libltdl. No libraries in LFS are expected to be loaded by
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| 23 | libltdl, and it's known that some .la files can cause BLFS packages
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| 24 | fail to build. Remove those files now:</para>
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[02b2631] | 25 |
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| 26 | <screen><userinput>find /usr/{lib,libexec} -name \*.la -delete</userinput></screen>
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| 27 |
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| 28 | <para>
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[2c8fdfc] | 29 | The current system size is now about 3 GB, however
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[02b2631] | 30 | the /tools directory is no longer needed. It uses about
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| 31 | 1 GB of disk space. Delete it now:
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| 32 | </para>
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| 33 |
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| 34 | <screen><userinput>rm -rf /tools</userinput></screen>
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| 35 | </sect2>
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| 36 |
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| 37 | <sect2>
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| 38 | <title>Backup</title>
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| 39 |
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[beb80e2] | 40 | <para>
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| 41 | At this point the essential programs and libraries have been created
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| 42 | and your current LFS system is in a good state. Your system can now be
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| 43 | backed up for later reuse. In case of fatal failures in the subsequent
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| 44 | chapters, it often turns out that removing everything and starting over
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| 45 | (more carefully) is the best option to recover. Unfortunately, all the
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| 46 | temporary files will be removed, too. To avoid spending extra time to
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| 47 | redo something which has been built successfully, creating a backup of
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| 48 | the current LFS system may prove useful.
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| 49 | </para>
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| 50 |
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[02b2631] | 51 | <note><para>
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| 52 | All the remaining steps in this section are optional. Nevertheless,
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| 53 | as soon as you begin installing packages in <xref
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| 54 | linkend="chapter-building-system"/>, the temporary files will be
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| 55 | overwritten. So it may be a good idea to do a backup of the current
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[2c8fdfc] | 56 | system as described below.
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[02b2631] | 57 | </para></note>
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[2c8fdfc] | 58 |
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[02b2631] | 59 | <para>
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| 60 | The following steps are performed from outside the chroot
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| 61 | environment. That means, you have to leave the chroot environment
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| 62 | first before continuing. The reason for that is to
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| 63 | get access to file system locations outside of the chroot
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| 64 | environment to store/read the backup archive which should
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| 65 | not be placed within the
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| 66 | <filename class="directory">$LFS</filename> hierarchy for
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| 67 | safety reasons.
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| 68 | </para>
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| 69 |
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[beb80e2] | 70 | <para>
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| 71 | If you have decided to make a backup, leave the chroot environment:
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| 72 | </para>
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| 73 |
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| 74 | <screen role="nodump"><userinput>exit</userinput></screen>
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| 75 |
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[02b2631] | 76 | <important>
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[beb80e2] | 77 | <para>
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| 78 | All of the following instructions are executed by
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| 79 | <systemitem class="username">root</systemitem> on your host system.
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| 80 | Take extra care about the commands you're going to run as mistakes
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[02b2631] | 81 | here can modify your host system. Be aware that the
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[2c8fdfc] | 82 | environment variable <envar>LFS</envar>
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| 83 | is set for user <systemitem class="username">lfs</systemitem> by default
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| 84 | but may <emphasis>not</emphasis> be set for
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[beb80e2] | 85 | <systemitem class="username">root</systemitem>.
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| 86 | </para>
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| 87 | <para>
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[c6f58f47] | 88 | Whenever commands are to be executed by <systemitem class="username">root</systemitem>,
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[02b2631] | 89 | make sure you have set <envar>LFS</envar>.
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[beb80e2] | 90 | </para>
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| 91 | <para>
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[02b2631] | 92 | This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
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| 93 | </para>
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| 94 | </important>
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| 95 |
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[beb80e2] | 96 | <para>Before making a backup, unmount the virtual file systems:</para>
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[02b2631] | 97 |
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[01ecba7] | 98 | <screen role="nodump"><userinput>mountpoint -q $LFS/dev/shm && umount $LFS/dev/shm
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[16cd0963] | 99 | umount $LFS/dev/pts
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[beb80e2] | 100 | umount $LFS/{sys,proc,run,dev}</userinput></screen>
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[02b2631] | 101 |
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| 102 | <para>
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[beb80e2] | 103 | Make sure you have at least 1 GB free disk space (the source tarballs
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| 104 | will be included in the backup archive) on the filesystem containing
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| 105 | directory where you create the backup archive.
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[02b2631] | 106 | </para>
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| 107 |
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| 108 | <para>
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[beb80e2] | 109 | Note that the instructions below specify the home directory of the host
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| 110 | system's <systemitem class="username">root</systemitem> user, which is
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| 111 | typically found on the root filesystem.
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[02b2631] | 112 | </para>
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| 113 |
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[beb80e2] | 114 | <para>
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| 115 | Replace <envar>$HOME</envar> by a directory of your choice if you
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[c6f58f47] | 116 | do not want to have the backup stored in <systemitem
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[beb80e2] | 117 | class="username">root</systemitem>'s home directory.
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| 118 | </para>
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[02b2631] | 119 |
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| 120 | <para>
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| 121 | Create the backup archive by running the following command:
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| 122 | </para>
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| 123 |
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| 124 | <note>
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| 125 | <para>
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| 126 | Because the backup archive is compressed, it takes a relatively
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[bcb20b4] | 127 | long time (over 10 minutes) even on a reasonably fast system.
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[02b2631] | 128 | </para>
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| 129 | </note>
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| 130 |
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[2198b5e] | 131 | <screen role="nodump"><userinput>cd $LFS
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[02b2631] | 132 | tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
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| 133 |
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[7fba075] | 134 | <note>
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| 135 | <para>
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| 136 | If continuing to chapter 8, don't forget to reenter the chroot
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| 137 | environment as explained in the <quote>Important</quote> box below.
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| 138 | </para>
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| 139 | </note>
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| 140 |
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[02b2631] | 141 | </sect2>
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| 142 |
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| 143 | <sect2>
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| 144 | <title>Restore</title>
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| 145 |
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| 146 | <para>
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| 147 | In case some mistakes have been made and you need to start over, you can
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| 148 | use this backup to restore the system and save some recovery time.
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[2c8fdfc] | 149 | Since the sources are located under
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[02b2631] | 150 | <filename class="directory">$LFS</filename>, they are included in the
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| 151 | backup archive as well, so they do not need to be downloaded again. After
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| 152 | checking that <envar>$LFS</envar> is set properly,
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| 153 | restore the backup by executing the following commands:
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| 154 | </para>
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| 155 |
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| 156 | <!-- Make the following look different so users don't blindly run the
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| 157 | restore when they don't need to. -->
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| 158 |
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[9904ecb] | 159 | <warning><para>The following commands are extremely dangerous. If
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[e286d8db] | 160 | you run <command>rm -rf ./*</command> as the &root; user and you
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[2c8fdfc] | 161 | do not change to the $LFS directory or the <envar>LFS</envar>
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[e286d8db] | 162 | environment variable is not set for the &root; user, it will destroy
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[02b2631] | 163 | your entire host system. YOU ARE WARNED.</para></warning>
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| 164 |
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[2198b5e] | 165 | <screen role="nodump"><computeroutput>cd $LFS
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| 166 | rm -rf ./*
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[02b2631] | 167 | tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
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| 168 |
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| 169 | <para>
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| 170 | Again, double check that the environment has been setup properly
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| 171 | and continue building the rest of the system.
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| 172 | </para>
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| 173 |
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| 174 | <important>
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| 175 | <para>
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| 176 | If you left the chroot environment to create a backup or restart
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| 177 | building using a restore, remember to check that the virtual
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| 178 | filesystems are still mounted (<command>findmnt | grep
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| 179 | $LFS</command>). If they are not mounted, remount them now as
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| 180 | described in <xref linkend='ch-tools-kernfs'/> and re-enter the chroot
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| 181 | environment (see <xref linkend='ch-tools-chroot'/>) before continuing.
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| 182 | </para>
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| 183 | </important>
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[2c8fdfc] | 184 |
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[02b2631] | 185 | </sect2>
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| 186 |
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| 187 | </sect1>
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