Changeset d2c332bc for chapter06/createfiles.xml

Timestamp:

04/13/2006 06:45:33 PM (18 years ago)

Author:

Archaic <archaic@…>

Branches:

10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.5-systemd, 7.6, 7.6-systemd, 7.7, 7.7-systemd, 7.8, 7.8-systemd, 7.9, 7.9-systemd, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, 9.1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc

Children:

a0d96d25

Parents:

dd7ed7b

Message:

Merged the udev_update branch to trunk.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7509 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:

• chapter06/createfiles.xml (modified) (2 diffs)

chapter06/createfiles.xml

@@ -9 +9 @@
   <?dbhtml filename="createfiles.html"?>
 
-  <title>Creating Essential Symlinks</title>
+  <title>Creating Essential Files and Symlinks</title>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/etc/passwd">/etc/passwd</primary>
+  </indexterm>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/etc/group">/etc/group</primary>
+  </indexterm>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/var/run/utmp">/var/run/utmp</primary>
+  </indexterm>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/var/log/btmp">/var/log/btmp</primary>
+  </indexterm>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/var/log/lastlog">/var/log/lastlog</primary>
+  </indexterm>
+
+  <indexterm zone="ch-system-createfiles">
+    <primary sortas="e-/var/log/wtmp">/var/log/wtmp</primary>
+  </indexterm>
 
   <para>Some programs use hard-wired paths to programs which do not exist yet. In
@@ -21 +45 @@
 ln -sv bash /bin/sh</userinput></screen>
 
+  <para>A proper Linux system maintains a list of the mounted file systems in
+  the file <filename>/etc/mtab</filename>.  Normally, this file would be
+  created when we mount a new file system. Since we will not be mounting any
+  file systems inside our chroot environment, create an empty file for
+  utilities that expect the presence of <filename>/etc/mtab</filename>:</para>
+
+<screen><userinput>touch /etc/mtab</userinput></screen>
+
+  <para>In order for user <systemitem class="username">root</systemitem> to be
+  able to login and for the name <quote>root</quote> to be recognized, there
+  must be relevant entries in the <filename>/etc/passwd</filename> and
+  <filename>/etc/group</filename> files.</para>
+
+  <para>Create the <filename>/etc/passwd</filename> file by running the following
+  command:</para>
+
+<screen><userinput>cat &gt; /etc/passwd &lt;&lt; "EOF"
+<literal>root:x:0:0:root:/root:/bin/bash</literal>
+EOF</userinput></screen>
+
+  <para>The actual password for <systemitem class="username">root</systemitem>
+  (the <quote>x</quote> used here is just a placeholder) will be set later.</para>
+
+  <para>Create the <filename>/etc/group</filename> file by running the following
+  command:</para>
+
+<screen><userinput>cat &gt; /etc/group &lt;&lt; "EOF"
+<literal>root:x:0:
+bin:x:1:
+sys:x:2:
+kmem:x:3:
+tty:x:4:
+tape:x:5:
+daemon:x:6:
+floppy:x:7:
+disk:x:8:
+lp:x:9:
+dialout:x:10:
+audio:x:11:
+video:x:12:
+utmp:x:13:
+usb:x:14:
+cdrom:x:15:</literal>
+EOF</userinput></screen>
+
+  <para>The created groups are not part of any standard&mdash;they are groups
+  decided on in part by the requirements of the Udev configuration in this
+  chapter, and in part by common convention employed by a number of existing
+  Linux distributions. The Linux Standard Base (LSB, available at <ulink
+  url="http://www.linuxbase.org"/>) recommends only that, besides the group
+  <systemitem class="groupname">root</systemitem> with a Group ID (GID) of 0,
+  a group <systemitem class="groupname">bin</systemitem> with a GID of 1 be
+  present. All other group names and GIDs can be chosen freely by the system
+  administrator since well-written programs do not depend on GID numbers, but
+  rather use the group's name.</para>
+
+  <para>To remove the <quote>I have no name!</quote> prompt, start a new
+  shell. Since a full Glibc was installed in <xref
+  linkend="chapter-temporary-tools"/> and the
+  <filename>/etc/passwd</filename> and <filename>/etc/group</filename>
+  files have been created, user name and group name resolution will now
+  work.</para>
+
+<screen role="nodump"><userinput>exec /tools/bin/bash --login +h</userinput></screen>
+
+  <para>Note the use of the <parameter>+h</parameter> directive. This tells
+  <command>bash</command> not to use its internal path hashing. Without this
+  directive, <command>bash</command> would remember the paths to binaries it has
+  executed. To ensure the use of the newly compiled binaries as soon as they are
+  installed, the <parameter>+h</parameter> directive will be used for the duration
+  of this chapter.</para>
+
+  <para>The <command>login</command>, <command>agetty</command>, and
+  <command>init</command> programs (and others) use a number of log
+  files to record information such as who was logged into the system and
+  when. However, these programs will not write to the log files if they
+  do not already exist. Initialize the log files and give them
+  proper permissions:</para>
+
+<screen><userinput>touch /var/run/utmp /var/log/{btmp,lastlog,wtmp}
+chgrp -v utmp /var/run/utmp /var/log/lastlog
+chmod -v 664 /var/run/utmp /var/log/lastlog</userinput></screen>
+
+  <para>The <filename>/var/run/utmp</filename> file records the users
+  that are currently logged in. The <filename>/var/log/wtmp</filename>
+  file records all logins and logouts. The
+  <filename>/var/log/lastlog</filename> file records when
+  each user last logged in. The <filename>/var/log/btmp</filename> file
+  records the bad login attempts.</para>
+
 </sect1>