source: BOOK/chroot/common/pwdgroup.xml @ 6aad380

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;
]>

<sect1 id="ch-chroot-pwdgroup">
  <?dbhtml filename="pwdgroup.html"?>

  <title>Creating the passwd, group, and log Files</title>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/etc/passwd">/etc/passwd</primary>
  </indexterm>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/etc/group">/etc/group</primary>
  </indexterm>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/var/run/utmp">/var/run/utmp</primary>
  </indexterm>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/var/log/btmp">/var/log/btmp</primary>
  </indexterm>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/var/log/lastlog">/var/log/lastlog</primary>
  </indexterm>

  <indexterm zone="ch-chroot-pwdgroup">
    <primary sortas="e-/var/log/wtmp">/var/log/wtmp</primary>
  </indexterm>

  <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::0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/bin/false
daemon:x:2:2:daemon:/sbin:/bin/false
adm:x:3:4:adm:/var/adm:/bin/false
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
lp:x:10:18:lp:/var/spool/lp:/bin/false
mail:x:30:30:mail:/var/spool/mail:/bin/false
news:x:31:31:news:/var/spool/news:/bin/false
uucp:x:32:32:uucp:/var/spool/uucp:/bin/false
operator:x:50:0:operator:/root:/bin/bash
postmaster:x:51:30:postmaster:/var/spool/mail:/bin/false
nobody:x:65534:65534:nobody:/:/bin/false</literal>
EOF</userinput></screen>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../../boot/common/pwdgroup.xml"
  xpointer="xpointer(//*[@os='a'])"/>

  <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::0:root
bin::1:root,bin,daemon
daemon::2:root,bin,daemon
sys::3:root,bin,adm
adm::4:root,adm,daemon
kmem::5:
utmp::6:
tty::10:
video::11:root
console::12:
disk::13:root,adm
floppy::14:root
cdrom::15:
cdrw::16:
tape::17:root
lp::18:lp
usb::19:
audio::20:
dialout::21:root
mail::30:mail
news::31:news
uucp::32:uucp
users::100:
nogroup::65533:
nobody::65534:</literal>
EOF</userinput></screen>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../../boot/common/pwdgroup.xml"
  xpointer="xpointer(//*[@os='b'])"/>

  <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-cross-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><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 the nexts chapters.</para>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../../boot/common/pwdgroup.xml"
  xpointer="xpointer(//*[@os='c'])"/>

<screen><userinput>touch /var/run/utmp /var/log/{btmp,lastlog,wtmp}
chgrp utmp /var/run/utmp /var/log/lastlog
chmod 664 /var/run/utmp /var/log/lastlog
chmod 600 /var/log/btmp</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>