source: gnome/core/gdm.xml@ fa4ff29

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY gdm-download-http "&gnome-download-http;/gdm/&gnome-version;/gdm-&gdm-version;.tar.xz">
  <!ENTITY gdm-download-ftp  "&gnome-download-ftp;/gdm/&gnome-version;/gdm-&gdm-version;.tar.xz">
  <!ENTITY gdm-md5sum        "df3f38061066f5e0816676b4eef7854a">
  <!ENTITY gdm-size          "1.6 MB">
  <!ENTITY gdm-buildsize     "59 MB">
  <!ENTITY gdm-time          "0.7 SBU">
]>

<sect1 id="gdm" xreflabel="GDM-&gdm-version;">
  <?dbhtml filename="gdm.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>GDM-&gdm-version;</title>

  <indexterm zone="gdm">
    <primary sortas="a-GDM">GDM</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to GDM</title>

    <para>The <application>GDM</application> package contains
    <application>GNOME</application>'s Display Manager daemon. This is
    useful for allowing configurable graphical logins.</para>

    &lfs70_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP): <ulink url="&gdm-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download (FTP): <ulink url="&gdm-download-ftp;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum: &gdm-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &gdm-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &gdm-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &gdm-time;</para>
      </listitem>
    </itemizedlist>

    <!--<bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Required patch: <ulink
        url="&patch-root;/gdm-&gdm-version;-fixes-1.patch"/></para>
      </listitem>
    </itemizedlist>-->

    <bridgehead renderas="sect3">GDM Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required"><xref linkend="accountsservice"/>,
    <xref linkend="gnome-panel"/>,
    <xref linkend="linux-pam"/>, and
    <xref linkend="xorg7-lib"/></para>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended"><xref linkend="consolekit"/>
    (Required for Shutdown/Restart functionality) and
    <xref linkend="polkit-gnome"/></para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
    <xref linkend='check'/> (required to run the testsuite),
    <xref linkend="upower"/>,
    <xref linkend="libxklavier"/>, and
    <xref linkend="tcpwrappers"/></para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/gdm"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of GDM</title>

    <para>It is recommended to have a dedicated user and group to take
    control of the <command>gdm-binary</command> daemon after it is
    started. Issue the following commands as the
    <systemitem class="username">root</systemitem> user:</para>

<screen role='root'><userinput>groupadd -fg 21 gdm &amp;&amp;
useradd -c "GDM Daemon Owner" -d /var/lib/gdm -u 21 \
    -g gdm -s /bin/false gdm  || [ $? == 9 ]</userinput></screen>

    <para>Install <application>GDM</application> by running
    the following commands as an unprivileged user:</para>

<screen><userinput><!--patch -Np1 -i ../gdm-&gdm-version;-fixes-1.patch &amp;&amp;-->
./configure --prefix=$GNOME_PREFIX \
            --sysconfdir=$GNOME_SYSCONFDIR \
            --libexecdir=$GNOME_PREFIX/lib/gdm \
            --localstatedir=/var \
            --with-pam-prefix=/etc \
            --enable-static=no &amp;&amp;
make</userinput></screen>

    <para>If you have installed <xref linkend="check"/> and you wish to run
    the testsuite, issue: <command>make check</command>.</para>

    <para>Now, as the <systemitem class="username">root</systemitem> user:</para>

<screen role='root'><userinput>make install &amp;&amp;
ln -fsv $GNOME_PREFIX/lib/gnome-settings-daemon/gnome-settings-daemon \
        $GNOME_PREFIX/lib/gdm &amp;&amp;
ln -fsv /usr/lib/ConsoleKit/ck-get-x11-display-device \
        $GNOME_PREFIX/lib/gdm &amp;&amp;
ln -fsv /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1 \
        $GNOME_PREFIX/lib/gdm
</userinput></screen>

   <para>If your <envar>GNOME_SYSCONFDIR</envar> is <emphasis>not</emphasis>
   simply <filename class="directory">/etc</filename> then you need to create
   some more symlinks so that the menus and some <literal>.desktop</literal>
   files (in particular <filename>gnome-settings-daemon.desktop</filename>) will
   be found, because <envar>XDG_CONFIG_DIRS</envar> is not respected when
   <command>gdm</command> invokes <command>gnome-session</command>. Run the
   following commands, still as the <systemitem class="username">root</systemitem>
   user:</para>

<screen role='root'><userinput>ln -sfv $GNOME_SYSCONFDIR/xdg/menus /etc/xdg &amp;&amp;
pushd $GNOME_SYSCONFDIR/xdg/autostart &amp;&amp;
FILES=`ls` &amp;&amp;
popd &amp;&amp;
for F in $FILES; do
    ln -sfv $GNOME_SYSCONFDIR/xdg/autostart/$F /etc/xdg/autostart
done
</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
    href="../../xincludes/gnome-prefix.xml"/>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
    href="../../xincludes/gnome-sysconfdir.xml"/>

    <para><parameter>--libexecdir=$GNOME_PREFIX/lib/gdm</parameter>: This
    parameter is used so that the <application>GDM</application> internal
    support programs are installed in the preferred location of <filename
    class='directory'>$GNOME_PREFIX/lib/gdm</filename> instead of <filename
    class='directory'>$GNOME_PREFIX/libexec</filename>.</para>

    <para><parameter>--localstatedir=/var</parameter>: This command
    puts files in <filename class="directory">/var</filename> instead of
    <filename class="directory">$GNOME_PREFIX/var</filename>.</para>

    <para><parameter>--with-pam-prefix=/etc</parameter>: This command puts
    <application>PAM</application> configuration files in
    <filename class="directory">/etc/pam.d</filename> instead of
    <filename class="directory">$GNOME_SYSCONFDIR</filename>.</para>

    <para><parameter>--enable-static=no</parameter>: This switch prevents the static
    libraries being installed.</para>

    <para><parameter>ln -fsv $GNOME_PREFIX/lib/gnome-settings-daemon/...</parameter>:
    these three symlinks allow the shutdown/restart functions in
    <application>gdm</application> to work.</para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring GDM</title>

    <sect3 id="gdm-config">
      <title>Config Files</title>

      <para><filename>$GNOME_SYSCONFDIR/gdm/custom.conf</filename></para>

      <indexterm zone="gdm gdm-config">
        <primary sortas="e-etc-gnome-&gnome-version;&gnome-minor-version;gdm-custom.conf">
        $GNOME_SYSCONFDIR/gdm/custom.conf</primary>
      </indexterm>

    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>The GDM daemon is configured using the
      <filename>$GNOME_SYSCONFDIR/gdm/custom.conf</filename> file.
      Default values are stored in GConf in the
      <filename>gdm.schemas</filename> file. It is recommended that end-users
      modify the <filename>$GNOME_SYSCONFDIR/gdm/custom.conf</filename> file
      because the schemas file may be overwritten when the user updates their
      system to have a newer version of GDM.</para>

      <para>The <application>GDM</application> <application>PAM</application>
      configuration files contain modules not present in a BLFS installation.
      Issue the following
      commands as the <systemitem class="username">root</systemitem> user to
      replace those files with files containing correctly specified
      modules:</para>

<screen role="root"><userinput>cat &gt; /etc/pam.d/gdm &lt;&lt; "EOF"
<literal>auth        required    pam_env.so
auth        required    pam_unix.so
account     required    pam_nologin.so
account     required    pam_unix.so
password    required    pam_unix.so
session     optional    pam_keyinit.so force revoke
session     required    pam_unix.so
session     required    pam_loginuid.so
session     optional    pam_console.so</literal>

EOF
chmod -v 644 /etc/pam.d/gdm

cat &gt; /etc/pam.d/gdm-autologin &lt;&lt; "EOF"
<literal>auth        required    pam_env.so
auth        required    pam_permit.so
account     required    pam_nologin.so
account     required    pam_unix.so
password    required    pam_unix.so
session     optional    pam_keyinit.so force revoke
session     required    pam_unix.so
session     required    pam_loginuid.so
session     optional    pam_console.so</literal>

EOF
chmod -v 644 /etc/pam.d/gdm-autologin

cat &gt; /etc/pam.d/gdm-welcome &lt;&lt; "EOF"
<literal>auth        required    pam_env.so
auth        required    pam_permit.so
account     required    pam_nologin.so
account     required    pam_unix.so
password    required    pam_unix.so
session     required    pam_loginuid.so
session     optional    pam_keyinit.so force revoke
session     required    pam_unix.so</literal>

EOF
chmod -v 644 /etc/pam.d/gdm-welcome
</userinput></screen>

      <indexterm zone="gdm gdm-config">
        <primary sortas="e-etc-pam.d-gdm">/etc/pam.d/gdm</primary>
      </indexterm>
      <indexterm zone="gdm gdm-config">
        <primary
        sortas="e-etc-pam.d-gdm-autologin">/etc/pam.d/gdm-autologin</primary>
      </indexterm>

      <para id="gdm-config-dbus">The shipped <filename>gnome.desktop</filename>
      file does not start the session <application>D-BUS</application> daemon, and
      as a result not all the files required by a <application>GNOME</application>
      window manager will be found.  You can create a new
      Xsession file using the following command as the root user.</para>

<screen role="root"><userinput>cat &gt; $GNOME_PREFIX/share/xsessions/gnome-dbus.desktop &lt;&lt; "EOF"
<literal>[Desktop Entry]
Encoding=UTF-8
Name=GNOME with D-BUS
Comment=GNOME Desktop with D-BUS support
Exec=dbus-launch --exit-with-session gnome-session
TryExec=/usr/bin/dbus-launch
Icon=
Type=Application</literal>

EOF
chmod -v 644 $GNOME_PREFIX/share/xsessions/gnome-dbus.desktop</userinput></screen>

      <para>Choose this session using the session selection dialog on the
      display manager login screen. You also have the opportunity to make this
      your default session.</para>

      <para>After you have compared the results from using these two different
      files, and particularly if the translations in the shipped file are useful
      to you, you can edit the <literal>Exec</literal> and <literal>TryExec</literal>
      commands in the provided <filename>gnome.desktop</filename> file. Alternatively,
      you can delete it if you find it useless.</para>

      <note>
        <para>You may use the <filename class='extension'>.desktop</filename>
        file created above as an example to create additional
        <filename class='extension'>.desktop</filename> files and add any other
        desired items to the <application>GDM</application> display manager session
        selection menu.</para>
      </note>

      <important>
        <para>If the system-wide <application>D-BUS</application> daemon was
        running during the installation of <application>gdm</application>,
        ensure you stop and restart the <application>D-BUS</application>
        daemon before attempting to start <command>gdm</command>.</para>
      </important>

      <para><command>gdm</command> can be tested by executing it as the
      <systemitem class="username">root</systemitem> user. If you wish to stop
      it you will need to go to a different tty and then kill it.</para>

    </sect3>

    <sect3 id="gdm-init">
      <title>Boot Script</title>

      <para>To start a graphical login when the system is booted, install the
      <filename>/etc/rc.d/init.d/gdm</filename> init script included in the
      <xref linkend="bootscripts"/> package. If your
      <envar>GNOME_PREFIX</envar> environment variable is anything other than
      <filename class='directory'>/usr</filename> or <filename
      class='directory'>/opt/gnome-&gnome-version;&gnome-minor-version;</filename>,
      you will need to modify the <envar>PATH</envar> statement in the script
      to include the path where you have <application>GNOME</application>
      installed.</para>

      <indexterm zone="gdm gdm-init">
        <primary sortas="f-gdm">gdm</primary>
      </indexterm>

<screen role="root"><userinput>make install-gdm</userinput></screen>

      <para>Now edit <filename>/etc/inittab</filename> with the following
      commands.</para>

<screen role="root"><userinput>sed -i 's/id:3:initdefault:/id:5:initdefault:/' \
    /etc/inittab</userinput></screen>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>Default, Default.sample, Default, Default, Xsession, gdm,
        gdm-screenshot, gdmflexiserver, gdm-crash-logger, gdm-factory-slave,
        gdm-host-chooser, gdm-product-slave, gdm-session-worker,
        gdm-simple-chooser, gdm-simple-greeter, gdm-simple-slave,
        gdm-user-switch-applet, gdm-xdmcp-chooser-slave, gdm, and gdm-binary</seg>
        <seg>libfingerprint.so, libpassword.so, libsmartcard.so</seg>
        <seg>$GNOME_SYSCONFDIR/{dbus-1/system.d.gdm/{Init,PostLogin,PostSession,PreSession}},
        <envar>$GNOME_PREFIX</envar>/{lib/gdm,share/{gnome/help/gdm/*,omf/gdm,
        pixmaps/faces}},
        /var/{cache/gdm,gdm,lib/gdm/.gconf.mandatory,log/gdm,
        run/gdm/greeter}</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="gdmflexiserver">
        <term><command>gdmflexiserver</command></term>
        <listitem>
          <para>is the flexi server mechanism which allows to run GDM sessions
          on demand, in a new virtual console.</para>
          <indexterm zone="gdm gdmflexiserver">
            <primary sortas="b-gdmflexiserver">gdmflexiserver</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-screenshot">
        <term><command>gdm-screenshot</command></term>
        <listitem>
          <para>is a screenshot tool.</para>
          <indexterm zone="gdm gdm-screenshot">
            <primary sortas="b-gdm-screenshot">gdm-screenshot</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-prog">
        <term><command>gdm</command></term>
        <listitem>
          <para>is a wrapper script to execute the
          <application>GDM</application> binary, the configurable
          <application>GNOME</application> based login prompt.</para>
          <indexterm zone="gdm gdm-prog">
            <primary sortas="b-gdm">gdm</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-binary">
        <term><command>gdm-binary</command></term>
        <listitem>
          <para>is the <application>GNOME</application> based login prompt.</para>
          <indexterm zone="gdm gdm-binary">
            <primary sortas="b-gdm-binary">gdm-binary</primary>
          </indexterm>
        </listitem>
      </varlistentry>

 <!--<varlistentry id="gdm-restart">
        <term><command>gdm-restart</command></term>
        <listitem>
          <para>sends the HUP signal to the <application>GDM</application>
          daemon so that it restarts. It's used after the config file
          is edited</para>
          <indexterm zone="gdm gdm-restart">
            <primary sortas="b-gdm-restart">gdm-restart</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-safe-restart">
        <term><command>gdm-safe-restart</command></term>
        <listitem>
          <para>sends the USR1 signal to the <application>GDM</application>
          daemon so that it restarts. It's used after the config file
          is edited.</para>
          <indexterm zone="gdm gdm-safe-restart">
            <primary sortas="b-gdm-safe-restart">gdm-safe-restart</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-stop">
        <term><command>gdm-stop</command></term>
        <listitem>
          <para>sends the TERM signal to the <application>GDM</application>
          daemon so that it stops. It's used after the config file is
          edited.</para>
          <indexterm zone="gdm gdm-stop">
            <primary sortas="b-gdm-stop">gdm-stop</primary>
          </indexterm>
        </listitem>
      </varlistentry>-->

    </variablelist>

  </sect2>

</sect1>