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 | <!ENTITY gdm-download-http "&gnome-download-http;/gdm/&gnome-43;/gdm-&gdm-version;.tar.xz">
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8 | <!ENTITY gdm-download-ftp "&gnome-download-ftp;/gdm/&gnome-43;/gdm-&gdm-version;.tar.xz">
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9 | <!ENTITY gdm-md5sum "d9ca2abdf2359d0420dc71a1bd1d7530">
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10 | <!ENTITY gdm-size "812 KB">
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11 | <!ENTITY gdm-buildsize "33 MB">
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12 | <!ENTITY gdm-time "0.3 SBU">
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13 | ]>
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14 |
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15 | <sect1 id="gdm" xreflabel="GDM-&gdm-version;">
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16 | <?dbhtml filename="gdm.html"?>
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17 |
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18 |
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19 | <title>GDM-&gdm-version;</title>
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20 |
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21 | <indexterm zone="gdm">
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22 | <primary sortas="a-GDM">GDM</primary>
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23 | </indexterm>
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24 |
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25 | <sect2 role="package">
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26 | <title>Introduction to GDM</title>
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27 |
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28 | <para>
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29 | <application>GDM</application> is a system service that is
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30 | responsible for providing graphical logins and managing local
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31 | and remote displays.
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32 | </para>
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33 |
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34 | &lfs112_checked;
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35 |
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36 | <bridgehead renderas="sect3">Package Information</bridgehead>
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37 | <itemizedlist spacing="compact">
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38 | <listitem>
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39 | <para>
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40 | Download (HTTP): <ulink url="&gdm-download-http;"/>
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41 | </para>
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42 | </listitem>
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43 | <listitem>
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44 | <para>
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45 | Download (FTP): <ulink url="&gdm-download-ftp;"/>
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46 | </para>
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47 | </listitem>
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48 | <listitem>
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49 | <para>
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50 | Download MD5 sum: &gdm-md5sum;
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51 | </para>
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52 | </listitem>
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53 | <listitem>
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54 | <para>
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55 | Download size: &gdm-size;
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56 | </para>
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57 | </listitem>
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58 | <listitem>
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59 | <para>
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60 | Estimated disk space required: &gdm-buildsize;
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61 | </para>
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62 | </listitem>
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63 | <listitem>
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64 | <para>
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65 | Estimated build time: &gdm-time;
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66 | </para>
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67 | </listitem>
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68 | </itemizedlist>
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69 | <!--
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70 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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71 | <itemizedlist spacing="compact">
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72 | <listitem>
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73 | <para>
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74 | Required patch:
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75 | <ulink url="&patch-root;/gdm-&gdm-version;-security_fix-1.patch"/>
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76 | </para>
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77 | </listitem>
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78 | </itemizedlist>
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79 | -->
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80 | <bridgehead renderas="sect3">GDM Dependencies</bridgehead>
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81 |
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82 | <bridgehead renderas="sect4">Required</bridgehead>
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83 | <para role="required">
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84 | <xref linkend="accountsservice"/>,
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85 | <xref linkend="gtk3"/>,
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86 | <xref linkend="iso-codes"/>,
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87 | <xref linkend="itstool"/>,
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88 | <xref linkend="libcanberra"/>,
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89 | <xref linkend="libdaemon"/>, and
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90 | <xref linkend="linux-pam"/>
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91 | </para>
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92 |
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93 | <bridgehead renderas="sect4">Optional</bridgehead>
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94 | <para role="optional">
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95 | <xref linkend="keyutils"/>
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96 | </para>
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97 |
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98 | <bridgehead renderas="sect4">Runtime Dependencies</bridgehead>
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99 | <para role="required">
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100 | <xref role="runtime" linkend="gnome-session"/>,
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101 | <xref role="runtime" linkend="gnome-shell"/>, and
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102 | <phrase revision="sysv"><xref role="runtime" linkend="elogind"/></phrase>
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103 | <phrase revision="systemd"><xref role="runtime" linkend="systemd"/></phrase>
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104 | </para>
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105 |
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106 | <para condition="html" role="usernotes">User Notes:
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107 | <ulink url="&blfs-wiki;/gdm"/>
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108 | </para>
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109 | </sect2>
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110 |
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111 | <sect2 role="installation">
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112 | <title>Installation of GDM</title>
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113 |
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114 | <para>
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115 | It is recommended to have a dedicated user and group to take
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116 | control of the <command>gdm</command> daemon after it is
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117 | started. Issue the following commands as the
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118 | <systemitem class="username">root</systemitem> user:
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119 | </para>
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120 |
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121 | <screen role="root"><userinput>groupadd -g 21 gdm &&
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122 | useradd -c "GDM Daemon Owner" -d /var/lib/gdm -u 21 \
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123 | -g gdm -s /bin/false gdm &&
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124 | passwd -ql gdm</userinput></screen>
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125 |
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126 | <para revision="sysv">
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127 | First, adapt GDM to build without systemd present:
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128 | </para>
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129 |
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130 | <screen revision="sysv"><userinput remap="pre">sed -i -r '/(^| )systemd_dep/d' meson.build</userinput></screen>
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131 |
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132 | <para>
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133 | Install <application>GDM</application> by running the following
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134 | commands:
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135 | </para>
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136 |
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137 | <screen revision="sysv"><userinput>sed -e 's@systemd@elogind@' \
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138 | -e '/elogind/isession required pam_loginuid.so' \
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139 | -i data/pam-lfs/gdm-launch-environment.pam &&
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140 |
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141 | mkdir build &&
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142 | cd build &&
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143 |
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144 | meson --prefix=/usr \
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145 | --buildtype=release \
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146 | -Dgdm-xsession=true \
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147 | -Dsystemd-journal=false \
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148 | -Dsystemdsystemunitdir=/tmp \
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149 | -Dsystemduserunitdir=/tmp .. &&
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150 | ninja</userinput></screen>
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151 |
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152 | <screen revision="systemd"><userinput>mkdir build &&
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153 | cd build &&
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154 |
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155 | meson --prefix=/usr \
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156 | --buildtype=release \
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157 | -Dgdm-xsession=true .. &&
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158 | ninja</userinput></screen>
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159 |
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160 | <para>
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161 | This package does not come with a usable test suite.
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162 | </para>
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163 |
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164 | <para>
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165 | Now, as the <systemitem class="username">root</systemitem> user:
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166 | </para>
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167 |
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168 | <screen role="root" revision="sysv"><userinput>ninja install &&
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169 | rm -rv /tmp/*.{service,target.d}</userinput></screen>
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170 |
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171 | <screen role="root" revision="systemd"><userinput>ninja install</userinput></screen>
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172 |
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173 | </sect2>
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174 |
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175 | <sect2 role="commands">
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176 | <title>Command Explanations</title>
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177 |
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178 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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179 | href="../../xincludes/meson-buildtype-release.xml"/>
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180 |
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181 | <para>
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182 | <option>-Dinitial-vt=7</option>: Use this switch
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183 | to make <application>GDM</application> start on VT7
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184 | instead of the first free VT.
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185 | </para>
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186 |
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187 | <para>
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188 | <option>-Ddefault-pam-config=lfs</option>: Use this
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189 | switch if you did not create the
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190 | <filename>/etc/lfs-release</filename> file or distribution
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191 | auto detection will fail and you will be unable to use
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192 | <application>GDM</application>.
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193 | </para>
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194 |
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195 | <para>
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196 | <parameter>-Dgdm-xsession=true</parameter>: This enables the
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197 | installation of the <application>GDM</application> Xsession file.
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198 | </para>
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199 |
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200 | </sect2>
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201 |
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202 | <sect2 role="configuration">
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203 | <title>Configuring GDM</title>
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204 |
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205 | <sect3 id="gdm-config">
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206 | <title>Config Files</title>
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207 |
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208 | <para>
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209 | <filename>/etc/gdm/custom.conf</filename>
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210 | </para>
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211 |
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212 | <indexterm zone="gdm gdm-config">
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213 | <primary sortas="e-etc-gdm-custom.conf">/etc/gdm/custom.conf</primary>
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214 | </indexterm>
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215 |
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216 | </sect3>
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217 |
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218 | <sect3>
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219 | <title>Configuration Information</title>
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220 |
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221 | <para>
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222 | The GDM daemon is configured using the
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223 | <filename>/etc/gdm/custom.conf</filename> file. Default values
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224 | are stored in GSettings in the <filename>gdm.schemas</filename>
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225 | file. It is recommended that end-users modify the
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226 | <filename>/etc/gdm/custom.conf</filename> file because the schemas
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227 | file may be overwritten when the user updates their system to have
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228 | a newer version of <application>GDM</application>.
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229 | </para>
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230 |
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231 | </sect3>
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232 |
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233 | <sect3 id="gdm-init">
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234 | <title><phrase revision="sysv">Boot Script</phrase>
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235 | <phrase revision="systemd">Systemd Unit</phrase></title>
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236 |
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237 | <indexterm zone="gdm gdm-init">
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238 | <primary sortas="f-gdm">gdm</primary>
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239 | </indexterm>
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240 |
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241 | <para revision="sysv">
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242 | To start <command>gdm</command> automatically when the system is
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243 | switched to runlevel 5, install the
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244 | <filename>/etc/rc.d/init.d/xdm</filename> script and the
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245 | <filename>/etc/sysconfig/xdm</filename> configuration file
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246 | included in the <xref linkend="bootscripts"/> package
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247 | and adjust <filename>/etc/inittab</filename> by running
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248 | as the <systemitem class="username">root</systemitem> user:
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249 | </para>
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250 |
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251 | <screen role="root" revision="sysv"><userinput>make install-gdm</userinput></screen>
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252 |
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253 | <para revision="sysv">
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254 | In order to permanently set the default runlevel to 5, starting the
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255 | <command>gdm</command> greeter screen automatically, you can modify
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256 | <filename>/etc/inittab</filename>. As the <systemitem
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257 | class="username">root</systemitem> user:
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258 | </para>
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259 |
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260 | <screen role="root" revision="sysv"><userinput>sed /initdefault/s/3/5/ -i /etc/inittab</userinput></screen>
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261 |
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262 | <para revision="systemd">
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263 | To start the <command>gdm</command> daemon at boot, enable
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264 | the previously installed systemd unit by running the following command
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265 | as the <systemitem class="username">root</systemitem> user:
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266 | </para>
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267 |
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268 | <screen role="root" revision="systemd"><userinput>systemctl enable gdm</userinput></screen>
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269 |
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270 | <!-- [pierre October 2020] I don't understand why this is here: power
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271 | management works perfectly well
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272 | <para revision="sysv">
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273 | You should also disable default elogind power management:
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274 | </para>
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275 |
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276 | <screen role="root" revision="sysv"><userinput>cat >> /etc/elogind/logind.conf << "EOF"
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277 | <literal>AllowSuspend=no
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278 | AllowHibernation=no</literal>
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279 | EOF</userinput></screen>
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280 | -->
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281 |
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282 | </sect3>
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283 |
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284 | </sect2>
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285 |
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286 | <sect2 role="starting">
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287 | <title>Starting GNOME</title>
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288 |
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289 | <para>
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290 | It is possible to start <application>GNOME</application> from the command
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291 | line, rather than using GDM. However, you must still have GDM installed
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292 | for some portions of the desktop to work. One reason to start from the
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293 | command line is if you want Wayland support on a system that has the
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294 | proprietary NVIDIA driver installed, since GDM will not show the Wayland
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295 | session type on such a system.
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296 | </para>
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297 |
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298 | <para>
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299 | To start <application>GNOME</application> using
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300 | <xref role="nodep" linkend="xinit"/>, run the following commands:
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301 | </para>
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302 |
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303 | <screen role="nodump"><userinput>cat > ~/.xinitrc << "EOF"
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304 | <literal>dbus-run-session gnome-session</literal>
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305 | EOF
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306 |
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307 | startx</userinput></screen>
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308 |
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309 | <para>
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310 | Alternatively, to start <application>GNOME</application> with Wayland
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311 | support, run the following command:
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312 | </para>
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313 |
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314 | <screen role="nodump"><userinput>dbus-run-session -- gnome-shell --display-server --wayland</userinput></screen>
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315 |
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316 | </sect2>
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317 |
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318 | <sect2 role="content">
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319 | <title>Contents</title>
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320 |
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321 | <segmentedlist>
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322 | <segtitle>Installed Programs</segtitle>
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323 | <segtitle>Installed Libraries</segtitle>
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324 | <segtitle>Installed Directories</segtitle>
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325 |
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326 | <seglistitem>
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327 | <seg>
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328 | gdm, gdmflexiserver, and gdm-screenshot
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329 | </seg>
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330 | <seg>
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331 | libgdm.so and pam_gdm.so (PAM Module)
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332 | </seg>
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333 | <seg>
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334 | /etc/gdm,
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335 | /usr/include/gdm,
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336 | /usr/share/gdm, and
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337 | /usr/share/help/*/gdm
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338 | <!-- seems those diretories are not created at install, but at
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339 | runtime
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340 | /var/cache/gdm,
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341 | /var/lib/gdm,
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342 | /var/log/gdm, and
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343 | /var/run/gdm-->
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344 | </seg>
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345 | </seglistitem>
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346 | </segmentedlist>
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347 |
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348 | <variablelist>
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349 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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350 | <?dbfo list-presentation="list"?>
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351 | <?dbhtml list-presentation="table"?>
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352 |
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353 | <varlistentry id="gdm-prog">
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354 | <term><command>gdm</command></term>
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355 | <listitem>
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356 | <para>
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357 | is a login prompt for <application>GNOME</application>
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358 | </para>
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359 | <indexterm zone="gdm gdm-prog">
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360 | <primary sortas="b-gdm">gdm</primary>
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361 | </indexterm>
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362 | </listitem>
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363 | </varlistentry>
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364 |
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365 | <varlistentry id="gdm-screenshot">
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366 | <term><command>gdm-screenshot</command></term>
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367 | <listitem>
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368 | <para>
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369 | is a screenshot tool for <application>GDM</application>
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370 | </para>
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371 | <indexterm zone="gdm gdm-screenshot">
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372 | <primary sortas="b-gdm-screenshot">gdm-screenshot</primary>
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373 | </indexterm>
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374 | </listitem>
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375 | </varlistentry>
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376 |
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377 | </variablelist>
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378 |
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379 | </sect2>
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380 |
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381 | </sect1>
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