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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8 | <sect1 id="ch-system-udev" role="wrap">
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9 | <?dbhtml filename="udev.html"?>
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10 |
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11 | <sect1info condition="script">
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12 | <productname>udev</productname>
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13 | <productnumber>&systemd-version;</productnumber>
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14 | <address>&systemd-url;</address>
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15 | </sect1info>
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16 |
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17 | <title>Udev-&systemd-version; (Extracted from systemd-&systemd-version;)</title>
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18 |
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19 | <indexterm zone="ch-system-udev">
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20 | <primary sortas="a-Udev">Udev</primary>
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21 | </indexterm>
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22 |
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23 | <sect2 role="package">
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24 | <title/>
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25 |
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26 | <para>The Udev package contains programs for dynamic creation of device
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27 | nodes. The development of udev has been merged with systemd, but
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28 | most of systemd is incompatible with LFS. Here we build and install just
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29 | the needed udev files.</para>
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30 |
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31 | <segmentedlist>
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32 | <segtitle>&buildtime;</segtitle>
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33 | <segtitle>&diskspace;</segtitle>
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34 |
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35 | <seglistitem>
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36 | <seg>&systemd-ch6-sbu;</seg>
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37 | <seg>&systemd-ch6-du;</seg>
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38 | </seglistitem>
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39 | </segmentedlist>
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40 | </sect2>
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41 |
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42 | <sect2 role="installation">
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43 | <title>Installation of Udev</title>
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44 |
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45 | <note><para>This package is a little different from other packages. The
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46 | initial package that is extracted is
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47 | <filename>systemd-&systemd-version;.tar.xz</filename> even though the
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48 | application we are installing is udev. After changing to the
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49 | systemd directory, follow the instructions below.</para></note>
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50 |
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51 | <para>The udev-lfs tarball contains LFS-specific files used to build
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52 | Udev. Unpack it into the systemd source directory:</para>
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53 |
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54 | <screen><userinput remap="pre">tar -xvf ../&udev-lfs;.tar.bz2</userinput></screen>
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55 |
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56 | <para>Create two symbolic links to header files and set an
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57 | environment variable to properly use <xref linkend="ch-tools-util-linux"/>.</para>
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58 |
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59 | <screen><userinput remap="pre">ln -svf /tools/include/blkid /usr/include
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60 | ln -svf /tools/include/uuid /usr/include
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61 | export LD_LIBRARY_PATH=/tools/lib</userinput></screen>
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62 |
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63 | <para>Build the package:</para>
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64 |
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65 | <screen><userinput remap="make">make -f &udev-lfs;/Makefile.lfs</userinput></screen>
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66 |
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67 | <para>Install the package:</para>
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68 |
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69 | <screen><userinput remap="install">make -f &udev-lfs;/Makefile.lfs install</userinput></screen>
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70 |
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71 | <caution><para>There are several places within the
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72 | <application>systemd</application> source code that have explicit directory
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73 | paths embedded. For instance, the binary version of the hardware
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74 | database's path and file name used at run time,
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75 | <filename>/etc/udev/hwdb.bin</filename>, cannot be changed without explicit
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76 | changes to the source code.</para></caution>
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77 |
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78 | <para>Now initialize the hardware database:</para>
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79 |
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80 | <screen><userinput remap="install">build/udevadm hwdb --update</userinput></screen>
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81 |
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82 | <para>Finally set up the persistent network udev rules. This task will be
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83 | explained in detail in <xref linkend='stable-net-names'/>. Note that the
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84 | <filename class='directory'>/sys</filename> and <filename
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85 | class='directory'>/proc</filename> filesystems must be mounted in the
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86 | chroot environment as explained at the beginning of this chapter for the
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87 | following script to work.</para>
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88 |
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89 | <screen><userinput remap="install">bash &udev-lfs;/init-net-rules.sh</userinput></screen>
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90 |
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91 | <para>Do some cleanup:</para>
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92 |
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93 | <screen><userinput remap="install">rm -fv /usr/include/{uuid,blkid}
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94 | unset LD_LIBRARY_PATH</userinput></screen>
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95 |
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96 | </sect2>
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97 |
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98 | <sect2 id="contents-udev" role="content">
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99 | <title>Contents of Udev</title>
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100 |
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101 | <segmentedlist>
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102 | <segtitle>Installed programs</segtitle>
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103 | <segtitle>Installed libraries</segtitle>
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104 | <segtitle>Installed directories</segtitle>
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105 |
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106 | <seglistitem>
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107 | <seg>accelerometer, ata_id, cdrom_id, collect, mtd_probe,
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108 | scsi_id, v4l_id, udevadm, and udevd</seg>
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109 |
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110 | <seg>libudev.so</seg>
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111 |
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112 | <seg>/etc/udev, /lib/udev, /lib/firmware, /usr/share/doc/udev</seg>
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113 | </seglistitem>
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114 | </segmentedlist>
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115 |
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116 | <variablelist>
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117 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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118 | <?dbfo list-presentation="list"?>
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119 | <?dbhtml list-presentation="table"?>
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120 |
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121 | <varlistentry id="ata_id">
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122 | <term><command>ata_id</command></term>
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123 | <listitem>
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124 | <para>Provides Udev with a unique string and
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125 | additional information (uuid, label) for an ATA drive</para>
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126 | <indexterm zone="ch-system-udev ata_id">
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127 | <primary sortas="b-ata_id">ata_id</primary>
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128 | </indexterm>
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129 | </listitem>
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130 | </varlistentry>
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131 |
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132 | <varlistentry id="cdrom_id">
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133 | <term><command>cdrom_id</command></term>
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134 | <listitem>
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135 | <para>Provides Udev with the capabilities of a
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136 | CD-ROM or DVD-ROM drive</para>
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137 | <indexterm zone="ch-system-udev cdrom_id">
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138 | <primary sortas="b-cdrom_id">cdrom_id</primary>
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139 | </indexterm>
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140 | </listitem>
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141 | </varlistentry>
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142 |
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143 | <varlistentry id="collect">
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144 | <term><command>collect</command></term>
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145 | <listitem>
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146 | <para>Given an ID for the current uevent and a list of
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147 | IDs (for all target uevents), registers the current ID
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148 | and indicates whether all target IDs have been registered</para>
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149 | <indexterm zone="ch-system-udev collect">
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150 | <primary sortas="b-collect">collect</primary>
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151 | </indexterm>
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152 | </listitem>
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153 | </varlistentry>
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154 |
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155 | <varlistentry id="scsi_id">
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156 | <term><command>scsi_id</command></term>
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157 | <listitem>
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158 | <para>Provides Udev with a unique SCSI identifier
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159 | based on the data returned from sending a SCSI INQUIRY command to
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160 | the specified device</para>
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161 | <indexterm zone="ch-system-udev scsi_id">
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162 | <primary sortas="b-scsi_id">scsi_id</primary>
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163 | </indexterm>
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164 | </listitem>
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165 | </varlistentry>
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166 |
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167 | <varlistentry id="udevadm">
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168 | <term><command>udevadm</command></term>
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169 | <listitem>
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170 | <para>Generic udev administration tool: controls the udevd daemon,
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171 | provides info from the Udev database, monitors uevents, waits for
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172 | uevents to finish, tests Udev configuration, and triggers uevents
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173 | for a given device</para>
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174 | <indexterm zone="ch-system-udev udevadm">
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175 | <primary sortas="b-udevadm">udevadm</primary>
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176 | </indexterm>
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177 | </listitem>
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178 | </varlistentry>
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179 |
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180 | <varlistentry id="udevd">
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181 | <term><command>udevd</command></term>
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182 | <listitem>
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183 | <para>A daemon that listens for uevents on the netlink socket,
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184 | creates devices and runs the configured external programs in
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185 | response to these uevents</para>
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186 | <indexterm zone="ch-system-udev udevd">
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187 | <primary sortas="b-udevd">udevd</primary>
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188 | </indexterm>
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189 | </listitem>
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190 | </varlistentry>
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191 |
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192 | <varlistentry id="libudev">
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193 | <term><filename class="libraryfile">libudev</filename></term>
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194 | <listitem>
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195 | <para>A library interface to udev device information</para>
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196 | <indexterm zone="ch-system-udev libudev">
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197 | <primary sortas="c-libudev">libudev</primary>
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198 | </indexterm>
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199 | </listitem>
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200 | </varlistentry>
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201 |
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202 | <varlistentry id="etc-udev">
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203 | <term><filename class="directory">/etc/udev</filename></term>
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204 | <listitem>
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205 | <para>Contains Udev configuration files,
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206 | device permissions, and rules for device naming</para>
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207 | <indexterm zone="ch-system-udev etc-udev">
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208 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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209 | </indexterm>
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210 | </listitem>
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211 | </varlistentry>
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212 |
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213 | </variablelist>
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214 |
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215 | </sect2>
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216 |
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217 | </sect1>
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