1 | <?xml version="1.0" encoding="UTF-8"?>
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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" revision="sysv">
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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 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.</para>
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28 |
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29 | <segmentedlist>
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30 | <segtitle>&buildtime;</segtitle>
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31 | <segtitle>&diskspace;</segtitle>
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32 |
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33 | <seglistitem>
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34 | <seg>&udev-fin-sbu;</seg>
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35 | <seg>&udev-fin-du;</seg>
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36 | </seglistitem>
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37 | </segmentedlist>
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38 | </sect2>
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39 |
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40 | <sect2 role="installation">
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41 | <title>Installation of Udev</title>
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42 |
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43 | <para>Udev is part of the systemd-&systemd-version; package. Use
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44 | the systemd-&systemd-version;.tar.xz file as the source tarball.</para>
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45 |
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46 | <para>Remove two unneeded groups,
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47 | <systemitem class="groupname">render</systemitem> and
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48 | <systemitem class="groupname">sgx</systemitem>, from the default udev
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49 | rules:</para>
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50 |
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51 | <screen><userinput remap="pre">sed -i -e 's/GROUP="render"/GROUP="video"/' \
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52 | -e 's/GROUP="sgx", //' rules.d/50-udev-default.rules.in</userinput></screen>
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53 |
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54 | <para>Remove one udev rule requiring a full Systemd installation:</para>
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55 |
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56 | <screen><userinput remap="pre">sed '/systemd-sysctl/s/^/#/' -i rules.d/99-systemd.rules.in</userinput></screen>
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57 |
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58 | <para>Adjust the hardcoded paths to network configuration files for the
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59 | standalone udev installation:</para>
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60 |
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61 | <screen><userinput remap="pre">sed '/NETWORK_DIRS/s/systemd/udev/' -i src/basic/path-lookup.h</userinput></screen>
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62 |
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63 | <para>Prepare Udev for compilation:</para>
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64 |
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65 | <screen><userinput remap="configure">mkdir -p build
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66 | cd build
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67 |
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68 | meson setup \
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69 | --prefix=/usr \
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70 | --buildtype=release \
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71 | -Dmode=release \
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72 | -Ddev-kvm-mode=0660 \
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73 | -Dlink-udev-shared=false \
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74 | -Dlogind=false \
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75 | -Dvconsole=false \
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76 | ..</userinput></screen>
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77 |
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78 | <variablelist>
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79 | <title>The meaning of the meson options:</title>
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80 |
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81 | <varlistentry>
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82 | <term><parameter>--buildtype=release</parameter></term>
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83 | <listitem>
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84 | <para>This switch overrides the default buildtype
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85 | (<quote>debug</quote>), which produces unoptimized
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86 | binaries.</para>
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87 | </listitem>
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88 | </varlistentry>
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89 |
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90 | <varlistentry>
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91 | <term><parameter>-Dmode=release</parameter></term>
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92 | <listitem>
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93 | <para>Disable some features considered experimental by upstream.
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94 | </para>
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95 | </listitem>
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96 | </varlistentry>
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97 |
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98 | <varlistentry>
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99 | <term><parameter>-Ddev-kvm-mode=0660</parameter></term>
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100 | <listitem>
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101 | <para>The default udev rule would allow all users to access
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102 | <filename class='devicefile'>/dev/kvm</filename>. The editors
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103 | consider it dangerous. This option overrides it.</para>
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104 | </listitem>
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105 | </varlistentry>
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106 |
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107 | <varlistentry>
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108 | <term><parameter>-Dlink-udev-shared=false</parameter></term>
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109 | <listitem>
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110 | <para>This option prevents udev from linking to the internal
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111 | systemd shared library,
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112 | <systemitem class='library'>libsystemd-shared</systemitem>.
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113 | This library is designed to be shared by many Systemd components
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114 | and it's too overkill for a udev-only installation.</para>
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115 | </listitem>
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116 | </varlistentry>
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117 |
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118 | <varlistentry>
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119 | <term><parameter>-Dlogind=false -Dvconsole=false</parameter></term>
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120 | <listitem>
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121 | <para>These options prevent the generation of several udev rule
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122 | files belonging to the other Systemd components that we won't
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123 | install.</para>
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124 | </listitem>
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125 | </varlistentry>
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126 | </variablelist>
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127 |
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128 | <para>Get the list of the shipped udev helpers and save it into an
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129 | environment variable (exporting it is not strictly necessary, but it makes
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130 | building as a regular user or using a package manager easier):</para>
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131 |
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132 | <screen><userinput remap="make">export udev_helpers=$(grep "'name' :" ../src/udev/meson.build | \
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133 | awk '{print $3}' | tr -d ",'" | grep -v 'udevadm')</userinput></screen>
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134 |
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135 | <para>Only build the components needed for udev:</para>
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136 |
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137 | <screen><userinput remap="make">ninja udevadm systemd-hwdb \
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138 | $(ninja -n | grep -Eo '(src/(lib)?udev|rules.d|hwdb.d)/[^ ]*') \
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139 | $(realpath libudev.so --relative-to .) \
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140 | $udev_helpers</userinput></screen>
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141 |
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142 | <para>Install the package:</para>
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143 |
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144 | <screen><userinput remap="install">install -vm755 -d {/usr/lib,/etc}/udev/{hwdb.d,rules.d,network}
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145 | install -vm755 -d /usr/{lib,share}/pkgconfig
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146 | install -vm755 udevadm /usr/bin/
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147 | install -vm755 systemd-hwdb /usr/bin/udev-hwdb
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148 | ln -svfn ../bin/udevadm /usr/sbin/udevd
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149 | cp -av libudev.so{,*[0-9]} /usr/lib/
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150 | install -vm644 ../src/libudev/libudev.h /usr/include/
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151 | install -vm644 src/libudev/*.pc /usr/lib/pkgconfig/
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152 | install -vm644 src/udev/*.pc /usr/share/pkgconfig/
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153 | install -vm644 ../src/udev/udev.conf /etc/udev/
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154 | install -vm644 rules.d/* ../rules.d/README /usr/lib/udev/rules.d/
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155 | install -vm644 $(find ../rules.d/*.rules \
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156 | -not -name '*power-switch*') /usr/lib/udev/rules.d/
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157 | install -vm644 hwdb.d/* ../hwdb.d/{*.hwdb,README} /usr/lib/udev/hwdb.d/
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158 | install -vm755 $udev_helpers /usr/lib/udev
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159 | install -vm644 ../network/99-default.link /usr/lib/udev/network</userinput></screen>
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160 |
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161 | <para>Install some custom rules and support files useful in an LFS
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162 | environment:</para>
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163 |
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164 | <screen><userinput remap="install">tar -xvf ../../&udev-lfs-version;.tar.xz
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165 | make -f &udev-lfs-version;/Makefile.lfs install</userinput></screen>
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166 |
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167 | <para>Install the man pages:</para>
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168 |
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169 | <!-- Please make sure systemd man pages tarball has a common leading
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170 | component in the path. -->
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171 | <screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz \
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172 | --no-same-owner --strip-components=1 \
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173 | -C /usr/share/man --wildcards '*/udev*' '*/libudev*' \
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174 | '*/systemd.link.5' \
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175 | '*/systemd-'{hwdb,udevd.service}.8
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176 |
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177 | sed 's|systemd/network|udev/network|' \
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178 | /usr/share/man/man5/systemd.link.5 \
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179 | > /usr/share/man/man5/udev.link.5
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180 |
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181 | sed 's/systemd\(\\\?-\)/udev\1/' /usr/share/man/man8/systemd-hwdb.8 \
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182 | > /usr/share/man/man8/udev-hwdb.8
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183 |
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184 | sed 's|lib.*udevd|sbin/udevd|' \
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185 | /usr/share/man/man8/systemd-udevd.service.8 \
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186 | > /usr/share/man/man8/udevd.8
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187 |
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188 | rm /usr/share/man/man*/systemd*</userinput></screen>
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189 |
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190 | <para>Finally, unset the <envar>udev_helpers</envar> variable:</para>
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191 |
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192 | <!-- remap="make" seems confusing but we don't have sth. like
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193 | remap="clean". -->
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194 | <screen><userinput remap="install">unset udev_helpers</userinput></screen>
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195 |
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196 | </sect2>
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197 |
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198 | <sect2 id="conf-udev" role="configuration">
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199 | <title>Configuring Udev</title>
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200 |
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201 | <indexterm zone="conf-udev">
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202 | <primary sortas="a-Udev">Udev</primary>
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203 | <secondary>configuring</secondary>
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204 | </indexterm>
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205 |
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206 | <indexterm zone="conf-udev">
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207 | <primary sortas="e-/etc/udev/hwdb.bin">/etc/udev/hwdb.bin</primary>
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208 | </indexterm>
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209 |
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210 | <para>Information about hardware devices is maintained in the
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211 | <filename class="directory">/etc/udev/hwdb.d</filename> and
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212 | <filename class="directory">/usr/lib/udev/hwdb.d</filename> directories.
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213 | <application>Udev</application> needs that information to be compiled
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214 | into a binary database <filename>/etc/udev/hwdb.bin</filename>. Create the
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215 | initial database:</para>
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216 |
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217 | <screen><userinput>udev-hwdb update</userinput></screen>
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218 |
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219 | <para>This command needs to be run each time the hardware information is
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220 | updated.</para>
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221 |
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222 | </sect2>
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223 |
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224 | <sect2 id="contents-udev" role="content">
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225 | <title>Contents of Udev</title>
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226 |
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227 | <segmentedlist>
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228 | <segtitle>Installed programs</segtitle>
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229 | <segtitle>Installed libraries</segtitle>
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230 | <segtitle>Installed directories</segtitle>
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231 |
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232 | <seglistitem>
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233 | <seg>udevadm, udevd (symlink to udevadm), and udev-hwdb</seg>
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234 |
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235 | <seg>libudev.so</seg>
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236 |
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237 | <seg>/etc/udev and /usr/lib/udev</seg>
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238 | </seglistitem>
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239 | </segmentedlist>
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240 |
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241 | <variablelist>
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242 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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243 | <?dbfo list-presentation="list"?>
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244 | <?dbhtml list-presentation="table"?>
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245 | <varlistentry id="udevadm" revision="sysv">
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246 | <term><command>udevadm</command></term>
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247 | <listitem>
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248 | <para>Generic udev administration tool: controls the udevd daemon,
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249 | provides info from the Udev database, monitors uevents, waits for
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250 | uevents to finish, tests Udev configuration, and triggers uevents
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251 | for a given device</para>
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252 | <indexterm zone="ch-system-udev udevadm">
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253 | <primary sortas="b-udevadm">udevadm</primary>
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254 | </indexterm>
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255 | </listitem>
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256 | </varlistentry>
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257 |
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258 | <varlistentry id="udevd">
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259 | <term><command>udevd</command></term>
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260 | <listitem>
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261 | <para>A daemon that listens for uevents on the netlink socket,
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262 | creates devices and runs the configured external programs in
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263 | response to these uevents</para>
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264 | <indexterm zone="ch-system-udev udevd">
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265 | <primary sortas="b-udevd">udevd</primary>
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266 | </indexterm>
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267 | </listitem>
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268 | </varlistentry>
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269 |
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270 | <varlistentry id="udev-hwdb">
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271 | <term><command>udev-hwdb</command></term>
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272 | <listitem>
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273 | <para>Updates or queries the hardware database.</para>
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274 | <indexterm zone="ch-system-udev udev-hwdb">
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275 | <primary sortas="b-udev-hwdb">udev-hwdb</primary>
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276 | </indexterm>
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277 | </listitem>
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278 | </varlistentry>
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279 |
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280 | <varlistentry id="libudev">
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281 | <term><filename class="libraryfile">libudev</filename></term>
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282 | <listitem>
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283 | <para>A library interface to udev device information</para>
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284 | <indexterm zone="ch-system-udev libudev">
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285 | <primary sortas="c-libudev">libudev</primary>
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286 | </indexterm>
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287 | </listitem>
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288 | </varlistentry>
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289 |
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290 | <varlistentry id="etc-udev">
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291 | <term><filename class="directory">/etc/udev</filename></term>
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292 | <listitem>
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293 | <para>Contains Udev configuration files,
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294 | device permissions, and rules for device naming</para>
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295 | <indexterm zone="ch-system-udev etc-udev">
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296 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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297 | </indexterm>
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298 | </listitem>
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299 | </varlistentry>
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300 |
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301 | </variablelist>
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302 |
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303 | </sect2>
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304 |
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305 | </sect1>
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