mirror of
https://github.com/Zeckmathederg/glfs.git
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b6a2a0ed32
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@9117 af4574ff-66df-0310-9fd7-8a98e5e911e0
445 lines
17 KiB
XML
445 lines
17 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY dbus-download-http "http://dbus.freedesktop.org/releases/dbus/dbus-&dbus-version;.tar.gz">
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<!--<!ENTITY dbus-download-ftp "&gentoo-ftp-repo;/dbus-&dbus-version;.tar.gz">-->
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<!ENTITY dbus-download-ftp " ">
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<!ENTITY dbus-md5sum "44a2a10678e7e50460879c3eb4453a65">
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<!ENTITY dbus-size "1.8 MB">
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<!ENTITY dbus-buildsize "83 MB">
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<!ENTITY dbus-time "0.5 SBU">
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]>
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<sect1 id="dbus" xreflabel="D-BUS-&dbus-version;">
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<?dbhtml filename="dbus.html"?>
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<title>D-BUS-&dbus-version;</title>
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<indexterm zone="dbus">
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<primary sortas="a-D-BUS">D-BUS</primary>
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</indexterm>
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<sect2 role="package">
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<title>Introduction to D-BUS</title>
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<para><application>D-BUS</application> is a message bus system, a simple
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way for applications to talk to one another.
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<application>D-BUS</application> supplies both a system daemon (for events
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such as <quote>new hardware device added</quote> or <quote>printer queue
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changed</quote>) and a per-user-login-session daemon (for general IPC needs
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among user applications). Also, the message bus is built on top of a
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general one-to-one message passing framework, which can be used by any two
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applications to communicate directly (without going through the message bus
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daemon).</para>
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&lfs70_checked;
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<bridgehead renderas="sect3">Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Download (HTTP): <ulink url="&dbus-download-http;"/></para>
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</listitem>
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<listitem>
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<para>Download (FTP): <ulink url="&dbus-download-ftp;"/></para>
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</listitem>
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<listitem>
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<para>Download MD5 sum: &dbus-md5sum;</para>
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</listitem>
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<listitem>
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<para>Download size: &dbus-size;</para>
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</listitem>
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<listitem>
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<para>Estimated disk space required: &dbus-buildsize;</para>
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</listitem>
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<listitem>
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<para>Estimated build time: &dbus-time;</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">D-BUS Dependencies</bridgehead>
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<bridgehead renderas="sect4">Required</bridgehead>
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<para role="required">
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<xref linkend="expat"/> (preferred) or
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<xref linkend="libxml2"/>
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</para>
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<bridgehead renderas="sect4">Optional</bridgehead>
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<para role="optional">
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<xref linkend="xorg7-lib"/>,
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<xref linkend="dbus-glib"/> (to run tests), and
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<xref linkend="doxygen"/> (to generate the API documentation)
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</para>
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<para>Note that the <command>configure</command> script will look for
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<xref linkend="xmlto"/> but it does nothing as the XML/HTML documentation is
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already shipped in the source tree.</para>
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<para condition="html" role="usernotes">User Notes:
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<ulink url="&blfs-wiki;/dbus"/></para>
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</sect2>
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<sect2 role="kernel" id='dbus-kernel'>
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<title>Kernel Configuration</title>
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<para>Ensure the following option is enabled in the kernel configuration
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and recompile the kernel if necessary:</para>
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<screen><literal>General Setup
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System V IPC</literal></screen>
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<indexterm zone="dbus dbus-kernel">
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<primary sortas="d-dbus">dbus</primary>
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</indexterm>
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</sect2>
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<sect2 role="installation">
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<title>Installation of D-BUS</title>
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<para>As the <systemitem class="username">root</systemitem> user, create a
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system user and group to handle the system message bus activity:</para>
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<screen role="root"><userinput>groupadd -g 18 messagebus &&
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useradd -c "D-BUS Message Daemon User" -d /dev/null \
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-u 18 -g messagebus -s /bin/false messagebus</userinput></screen>
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<para>Install <application>D-BUS</application> by running the following
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commands (you may wish to review the output from
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<command>./configure --help</command> first and add any desired parameters
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to the <command>configure</command> command shown below):</para>
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<screen><userinput>./configure --prefix=/usr \
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--sysconfdir=/etc \
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--libexecdir=/usr/lib/dbus-1.0 \
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--localstatedir=/var &&
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make</userinput></screen>
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<!--
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<para>The <option>- -enable-doxygen-docs</option> parameter does not work
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properly. If you have <application>Doxygen</application> installed and you
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wish to build the API documentation, issue
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<command>doxygen</command>.</para>
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-->
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<para>See below for test instructions.</para>
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<para>Now, as the <systemitem class="username">root</systemitem>
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user:</para>
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<screen role="root"><userinput>make install &&
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mv -v /usr/share/doc/dbus /usr/share/doc/dbus-&dbus-version;</userinput></screen>
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<para>The dbus tests cannot be run until after <xref linkend="dbus-glib"/>
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has been installed. The tests require passing additional parameters to
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<command>configure</command> and exposing additional functionality in the
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binaries. These interfaces are not intended to be used in a production
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build of <application>D-BUS</application>. If you would like to run the
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unit tests, issue the following commands:</para>
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<screen><userinput>make distclean &&
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./configure --enable-tests --enable-asserts &&
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make &&
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make check &&
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make distclean</userinput></screen>
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<para>Note there has been a report that the tests may fail if running
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inside a Midnight Commander shell.</para>
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</sect2>
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<sect2 role="commands">
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<title>Command Explanations</title>
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<para><parameter>--libexecdir=/usr/lib/dbus-1.0 </parameter>: This will
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install binaries meant to be only used internally by
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<application>D-BUS</application>, and the directory
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<filename class="directory">dbus-1</filename> into
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<filename class="directory">/usr/lib/dbus-1.0</filename> instead of
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into <filename class="directory">/usr/libexec</filename>.</para>
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<para><parameter>--localstatedir=/var</parameter>: This parameter causes
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the daemon PID file, system bus socket and machine uuid file to be
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created in the <filename class="directory">/var</filename> directory
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instead of the <filename class="directory">/usr/var</filename>
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directory.</para>
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<para><parameter>--enable-tests</parameter>: Build extra parts of the code
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to support testing. Configure will end with a NOTE warning about this.</para>
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<para><parameter>--enable-asserts</parameter>: Enable debugging code to run
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assertions for statements normally assumed to be true. This prevents a
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warning that '<parameter>--enable-tests</parameter>' on its own is only useful
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for profiling and might not give true results for all tests, but adds its own
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NOTE that this should not be used in a production build.
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</para>
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<para><parameter>--disable-static</parameter>: Prevent the static libraries
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being built and installed.</para>
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</sect2>
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<sect2 role="configuration">
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<title>Configuring dbus</title>
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<sect3 id="dbus-config">
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<title>Config Files</title>
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<para><filename>/etc/dbus-1/session.conf</filename>,
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<filename>/etc/dbus-1/system.conf</filename> and
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<filename>/etc/dbus-1/system.d/*</filename></para>
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<indexterm zone="dbus dbus-config">
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<primary sortas="e-etc-dbus-1-session.conf">/etc/dbus-1/session.conf</primary>
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</indexterm>
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<indexterm zone="dbus dbus-config">
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<primary sortas="e-etc-dbus-1/system.conf">/etc/dbus-1/system.conf</primary>
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</indexterm>
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<indexterm zone="dbus dbus-config">
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<primary sortas="e-etc-dbus-1-system.d-star">/etc/dbus-1/system.d/*</primary>
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</indexterm>
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</sect3>
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<sect3 id="dbus-session-config" xreflabel="D-Bus custom services directory">
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<title>Configuration Information</title>
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<para>The configuration files listed above should probably not be
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modified. If changes are required, you should create
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<filename>/etc/dbus-1/session-local.conf</filename> and/or
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<filename>/etc/dbus-1/system-local.conf</filename> and make any
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desired changes to these files.</para>
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<para>If any packages install a
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<application>D-Bus</application> <filename>.service</filename>
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file outside of the standard <filename
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class="directory">/usr/share/dbus-1/services</filename> directory,
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that directory should be added to the local session configuration.
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For instance, <filename
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class="directory">/usr/local/share/dbus-1/services</filename> can
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be added by performing the following commands as the
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<systemitem class="username">root</systemitem> user:</para>
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<screen role="root"><userinput>cat > /etc/dbus-1/session-local.conf << "EOF"
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<literal><!DOCTYPE busconfig PUBLIC
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"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
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"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
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<busconfig>
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<!-- Search for .service files in /usr/local -->
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<servicedir>/usr/local/share/dbus-1/services</servicedir>
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</busconfig></literal>
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EOF</userinput></screen>
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<!-- <para>Many packages will refuse to run if the file
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<literal>/var/lib/dbus/machine-id</literal> does not exist, and
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complain that <application>dbus</application> has not been properly
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installed. To prevent this, run the following command as the
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<systemitem class="username">root</systemitem> user:</para>
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<screen><userinput>dbus-uuidgen - -ensure</userinput></screen>
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<para>This will create a unique identifier for the machine.</para> -->
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</sect3>
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<sect3 id="dbus-init">
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<title>Boot Script</title>
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<para>To automatically start <command>dbus-daemon</command> when the
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system is rebooted, install the
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<filename>/etc/rc.d/init.d/dbus</filename> bootscript from the
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<xref linkend="bootscripts"/> package.</para>
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<indexterm zone="dbus dbus-init">
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<primary sortas="f-dbus">dbus</primary>
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</indexterm>
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<screen role="root"><userinput>make install-dbus</userinput></screen>
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<para>Note that this boot script only starts the system-wide
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<application>D-BUS</application> daemon. Each user requiring access to
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<application>D-BUS</application> services will also need to run a
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session daemon as well. There are many methods you can use to start a
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session daemon using the <command>dbus-launch</command> command. Review
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the <command>dbus-launch</command> man page for details about the
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available parameters and options. Here are some suggestions and
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examples:</para>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Add <command>dbus-launch</command> to the line in the
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<filename>~/.xinitrc</filename> file that starts your graphical
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desktop environment as shown in <xref linkend="gnome-config"/>.</para>
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</listitem>
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<listitem>
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<para>If you use <command>xdm</command> or some other display manager
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that calls the <filename>~/.xsession</filename> file, you can add
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<command>dbus-launch</command> to the line in your
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<filename>~/.xsession</filename> file that starts your graphical
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desktop environment. The syntax would be similar to the example in
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the <filename>~/.xinitrc</filename> file.</para>
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</listitem>
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<listitem>
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<para>If you use <command>gdm</command> or some other display manager
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that utilizes custom files to initiate sessions, use the example in
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<xref linkend="gdm-config-dbus"/> of the
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<application>GDM</application> instructions to create a file
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containing <command>dbus-launch</command>.</para>
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</listitem>
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<listitem>
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<para>The examples shown previously use
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<command>dbus-launch</command> to specify a program to be run. This
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has the benefit (when also using the
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<parameter>--exit-with-session</parameter> parameter) of stopping the
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session daemon when the specified program is stopped. You can also
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start the session daemon in your system or personal startup scripts
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by adding the following lines:</para>
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<screen><userinput><literal># Start the D-BUS session daemon
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eval `dbus-launch`
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export DBUS_SESSION_BUS_ADDRESS</literal></userinput></screen>
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<para>This method will not stop the session daemon when you exit
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your shell, therefore you should add the following line to your
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<filename>~/.bash_logout</filename> file:</para>
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<screen><userinput><literal># Kill the D-BUS session daemon
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kill $DBUS_SESSION_BUS_PID</literal></userinput></screen>
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</listitem>
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<listitem>
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<para>A hint has been written that provides ways to start scripts
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using the KDM session manager of KDE. The concepts in this hint could
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possibly be used with other session managers as well. The hint is
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located at <ulink
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url="&hints-root;/downloads/files/execute-session-scripts-using-kdm.txt"/>.
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</para>
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</listitem>
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</itemizedlist>
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</sect3>
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</sect2>
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<sect2 role="content">
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<title>Contents</title>
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<segmentedlist>
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<segtitle>Installed Programs</segtitle>
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<segtitle>Installed Library</segtitle>
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<segtitle>Installed Directories</segtitle>
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<seglistitem>
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<seg>dbus-cleanup-sockets, dbus-daemon, dbus-daemon-launch-helper,
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dbus-launch, dbus-monitor, dbus-send, and dbus-uuidgen</seg>
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<seg>libdbus-1.{so,a}</seg>
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<seg>/etc/dbus-1/{session.d,system.d}, /usr/{include/dbus-1.0/dbus,
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lib/{dbus-1.0/include/dbus,dbus/dbus-1},share/dbus-1/{services,
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system-services}}, /var/{lib/dbus,run/dbus}</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="dbus-cleanup-sockets">
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<term><command>dbus-cleanup-sockets</command></term>
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<listitem>
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<para>is used to clean up leftover sockets in a directory.</para>
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<indexterm zone="dbus dbus-cleanup-sockets">
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<primary sortas="b-dbus-cleanup-sockets">dbus-cleanup-sockets</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="dbus-daemon">
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<term><command>dbus-daemon</command></term>
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<listitem>
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<para>is the <application>D-BUS</application> message bus
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daemon.</para>
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<indexterm zone="dbus dbus-daemon">
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<primary sortas="b-dbus-daemon">dbus-daemon</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="dbus-launch">
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<term><command>dbus-launch</command></term>
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<listitem>
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<para>is used to start <command>dbus-daemon</command> from a shell
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script. It would normally be called from a user's login
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scripts.</para>
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<indexterm zone="dbus dbus-launch">
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<primary sortas="b-dbus-launch">dbus-launch</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="dbus-monitor">
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<term><command>dbus-monitor</command></term>
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<listitem>
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<para>is used to monitor messages going through a
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<application>D-BUS</application> message bus.</para>
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<indexterm zone="dbus dbus-monitor">
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<primary sortas="b-dbus-monitor">dbus-monitor</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="dbus-send">
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<term><command>dbus-send</command></term>
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<listitem>
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<para>is used to send a message to a <application>D-BUS</application>
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message bus.</para>
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<indexterm zone="dbus dbus-send">
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<primary sortas="b-dbus-send">dbus-send</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="dbus-uuidgen">
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<term><command>dbus-uuidgen</command></term>
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<listitem>
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<para>is used to generate or read a universally unique ID.</para>
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<indexterm zone="dbus dbus-uuidgen">
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<primary sortas="b-dbus-uuidgen">dbus-uuidgen</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libdbus-1">
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<term><filename class='libraryfile'>libdbus-1.{so,a}</filename></term>
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<listitem>
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<para>contains the API functions used by the
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<application>D-BUS</application> message daemon.
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<application>D-BUS</application> is first a library that provides
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one-to-one communication between any two applications;
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<command>dbus-daemon</command> is an application that uses this
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library to implement a message bus daemon.</para>
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<indexterm zone="dbus libdbus-1">
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<primary sortas="c-libdbus-1">libdbus-1.{so,a}</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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