man/tmpfiles.d.xml

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   7   Copyright 2010 Brandon Philips
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  22 <refentry id="tmpfiles.d">
  23
  24         <refentryinfo>
  25                 <title>tmpfiles.d</title>
  26                 <productname>systemd</productname>
  27
  28                 <authorgroup>
  29                         <author>
  30                                 <contrib>Documentation</contrib>
  31                                 <firstname>Brandon</firstname>
  32                                 <surname>Philips</surname>
  33                                 <email>brandon@ifup.org</email>
  34                         </author>
  35                 </authorgroup>
  36         </refentryinfo>
  37
  38         <refmeta>
  39                 <refentrytitle>tmpfiles.d</refentrytitle>
  40                 <manvolnum>5</manvolnum>
  41         </refmeta>
  42
  43         <refnamediv>
  44                 <refname>tmpfiles.d</refname>
  45                 <refpurpose>Configuration for creation, deletion and
  46                 cleaning of volatile and temporary files</refpurpose>
  47         </refnamediv>
  48
  49         <refsynopsisdiv>
  50                 <para><filename>/usr/lib/tmpfiles.d/*.conf</filename></para>
  51                 <para><filename>/etc/tmpfiles.d/*.conf</filename></para>
  52                 <para><filename>/run/tmpfiles.d/*.conf</filename></para>
  53         </refsynopsisdiv>
  54
  55         <refsect1>
  56                 <title>Description</title>
  57
  58                 <para><command>systemd-tmpfiles</command> uses the
  59                 configuration files from the above directories to describe the
  60                 creation, cleaning and removal of volatile and
  61                 temporary files and directories which usually reside
  62                 in directories such as <filename>/run</filename>
  63                 or <filename>/tmp</filename>.</para>
  64         </refsect1>
  65
  66         <refsect1>
  67                 <title>Configuration Format</title>
  68
  69                 <para>Each configuration file is named in the style of
  70                 <filename>&lt;program&gt;.conf</filename>.
  71                 Files in <filename>/etc/</filename> overwrite
  72                 files with the same name in <filename>/usr/lib/</filename>.
  73                 Files in <filename>/run</filename> overwrite files with
  74                 the same name in <filename>/etc/</filename> and
  75                 <filename>/usr/lib/</filename>. Packages should install their
  76                 configuration files in <filename>/usr/lib/</filename>, files
  77                 in <filename>/etc/</filename> are reserved for the local
  78                 administration, which possibly decides to overwrite the
  79                 configurations installed from packages. All files are sorted
  80                 by filename in alphabetical order, regardless in which of the
  81                 directories they reside, to ensure that a specific
  82                 configuration file takes precedence over another file with
  83                 an alphabetically later name.</para>
  84
  85                 <para>The configuration format is one line per path
  86                 containing action, mode, ownership and age
  87                 fields:</para>
  88
  89                 <programlisting>Type Path          Mode UID  GID  Age
  90 d    /run/user 0755 root root 10d</programlisting>
  91
  92                 <refsect2>
  93                         <title>Type</title>
  94                         <variablelist>
  95                                 <varlistentry>
  96                                         <term><varname>f</varname></term>
  97                                         <listitem><para>Create a file if it doesn't exist yet</para></listitem>
  98                                 </varlistentry>
  99
 100                                 <varlistentry>
 101                                         <term><varname>F</varname></term>
 102                                         <listitem><para>Create or truncate a file</para></listitem>
 103                                 </varlistentry>
 104
 105                                 <varlistentry>
 106                                         <term><varname>d</varname></term>
 107                                         <listitem><para>Create a directory if it doesn't exist yet</para></listitem>
 108                                 </varlistentry>
 109
 110                                 <varlistentry>
 111                                         <term><varname>D</varname></term>
 112                                         <listitem><para>Create or empty a directory</para></listitem>
 113                                 </varlistentry>
 114
 115                                 <varlistentry>
 116                                         <term><varname>x</varname></term>
 117                                         <listitem><para>Ignore a path
 118                                         during cleaning. Use this type
 119                                         to exclude paths from clean-up
 120                                         as controlled with the Age
 121                                         parameter. Note that lines of
 122                                         this type do not influence the
 123                                         effect of r or R lines. Lines
 124                                         of this type accept
 125                                         shell-style globs in place of
 126                                         of normal path
 127                                         names.</para></listitem>
 128                                 </varlistentry>
 129
 130                                 <varlistentry>
 131                                         <term><varname>r</varname></term>
 132                                         <listitem><para>Remove a file
 133                                         or directory if it
 134                                         exists. This may not be used
 135                                         to remove non-empty
 136                                         directories, use R for
 137                                         that. Lines of this type
 138                                         accept shell-style globs in
 139                                         place of normal path
 140                                         names.</para></listitem>
 141                                 </varlistentry>
 142
 143                                 <varlistentry>
 144                                         <term><varname>R</varname></term>
 145                                         <listitem><para>Recursively
 146                                         remove a path and all its
 147                                         subdirectories (if it is a
 148                                         directory). Lines of this type
 149                                         accept shell-style globs in
 150                                         place of normal path
 151                                         names.</para></listitem>
 152                                 </varlistentry>
 153                         </variablelist>
 154                 </refsect2>
 155
 156                 <refsect2>
 157                         <title>Mode</title>
 158
 159                         <para>The file access mode to use when
 160                         creating this file or directory. If omitted or
 161                         when set to - the default is used: 0755 for
 162                         directories, 0644 for files. This parameter is
 163                         ignored for x, r, R lines.</para>
 164                 </refsect2>
 165
 166                 <refsect2>
 167                         <title>UID, GID</title>
 168
 169                         <para>The user and group to use for this file
 170                         or directory. This may either be a numeric
 171                         user/group ID or a user or group name. If
 172                         omitted or when set to - the default 0 (root)
 173                         is used. . These parameters are ignored for x,
 174                         r, R lines.</para>
 175                 </refsect2>
 176
 177                 <refsect2>
 178                         <title>Age</title>
 179                         <para>The date field, when set, is used to
 180                         decide what files to delete when cleaning. If
 181                         a file or directory is older than the current
 182                         time minus the age field it is deleted. The
 183                         field format is a series of integers each
 184                         followed by one of the following
 185                         postfixes for the respective time units:</para>
 186
 187                         <variablelist>
 188                                 <varlistentry>
 189                                 <term><varname>s</varname></term>
 190                                 <term><varname>min</varname></term>
 191                                 <term><varname>h</varname></term>
 192                                 <term><varname>d</varname></term>
 193                                 <term><varname>w</varname></term>
 194                                 <term><varname>ms</varname></term>
 195                                 <term><varname>m</varname></term>
 196                                 <term><varname>us</varname></term></varlistentry>
 197                         </variablelist>
 198
 199                         <para>If multiple integers and units are specified the time
 200                         values are summed up.</para>
 201
 202                         <para>The age field only applies to lines starting with
 203                         d, D and x. If omitted or set to - no automatic clean-up
 204                         is done.</para>
 205                 </refsect2>
 206
 207         </refsect1>
 208
 209         <refsect1>
 210                 <title>Example</title>
 211                 <example>
 212                         <title>/etc/tmpfiles.d/screen.conf example</title>
 213                         <para><command>screen</command> needs two directories created at boot with specific modes and ownership.</para>
 214
 215                         <programlisting>d /var/run/screens 1777 root root 10d
 216 d /var/run/uscreens 0755 root root 10d12h</programlisting>
 217                 </example>
 218         </refsect1>
 219
 220         <refsect1>
 221                 <title>See Also</title>
 222                 <para>
 223                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 224                         <citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 225                 </para>
 226         </refsect1>
 227
 228 </refentry>