eudev/man/tmpfiles.d.xml

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<refentry id="tmpfiles.d">

        <refentryinfo>
                <title>tmpfiles.d</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Documentation</contrib>
                                <firstname>Brandon</firstname>
                                <surname>Philips</surname>
                                <email>brandon@ifup.org</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>tmpfiles.d</refentrytitle>
                <manvolnum>5</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>tmpfiles.d</refname>
                <refpurpose>Configuration for creation, deletion and
                cleaning of volatile and temporary files</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <para><filename>/usr/lib/tmpfiles.d/*.conf</filename></para>
                <para><filename>/etc/tmpfiles.d/*.conf</filename></para>
                <para><filename>/run/tmpfiles.d/*.conf</filename></para>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

		<para><command>systemd-tmpfiles</command> uses the
		configuration files from the above directories to describe the
		creation, cleaning and removal of volatile and
		temporary files and directories which usually reside
		in directories such as <filename>/run</filename>
		or <filename>/tmp</filename>.</para>
        </refsect1>

        <refsect1>
		<title>Configuration Format</title>

                <para>Each configuration file is named in the style of
                <filename>&lt;program&gt;.conf</filename>.  Files in
                <filename>/etc/</filename> override files with the
                same name in <filename>/usr/lib/</filename>.  Files in
                <filename>/run</filename> override files with the same
                name in <filename>/etc/</filename> and
                <filename>/usr/lib/</filename>. Packages should
                install their configuration files in
                <filename>/usr/lib/</filename>, files in
                <filename>/etc/</filename> are reserved for the local
                administrator, who may choose to override the
                configurations installed from packages. The list of
                configuration files are sorted by their filename in
                alphabetical order, regardless in which of the
                directories they reside, to guarantee that a
                configuration file takes precedence over another
                configuration file with an alphabetically later
                name.</para>

		<para>The configuration format is one line per path
		containing action, path, mode, ownership, age and argument
		fields:</para>

                <programlisting>Type Path        Mode UID  GID  Age Argument
d    /run/user   0755 root root 10d -
L    /tmp/foobar -    -    -    -   /dev/null</programlisting>

                <refsect2>
                        <title>Type</title>
                        <variablelist>
                                <varlistentry>
                                        <term><varname>f</varname></term>
                                        <listitem><para>Create a file if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>F</varname></term>
                                        <listitem><para>Create or truncate a file</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>d</varname></term>
                                        <listitem><para>Create a directory if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>D</varname></term>
                                        <listitem><para>Create or empty a directory</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>p</varname></term>
                                        <listitem><para>Create a named pipe (FIFO) if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>L</varname></term>
                                        <listitem><para>Create a symlink if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>c</varname></term>
                                        <listitem><para>Create a character device node if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>b</varname></term>
                                        <listitem><para>Create a block device node if it doesn't exist yet</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>x</varname></term>
                                        <listitem><para>Ignore a path
                                        during cleaning. Use this type
                                        to exclude paths from clean-up
                                        as controlled with the Age
                                        parameter. Note that lines of
                                        this type do not influence the
                                        effect of r or R lines. Lines
                                        of this type accept
                                        shell-style globs in place of
                                        of normal path
                                        names.</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>r</varname></term>
                                        <listitem><para>Remove a file
                                        or directory if it
                                        exists. This may not be used
                                        to remove non-empty
                                        directories, use R for
                                        that. Lines of this type
                                        accept shell-style globs in
                                        place of normal path
                                        names.</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>R</varname></term>
                                        <listitem><para>Recursively
                                        remove a path and all its
                                        subdirectories (if it is a
                                        directory). Lines of this type
                                        accept shell-style globs in
                                        place of normal path
                                        names.</para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>z</varname></term>
                                        <listitem><para>Set ownership, access
                                        mode and relabel security context of
                                        a file or directory if it exists.
                                        Lines of this type accept shell-style
                                        globs in place of normal path names.
                                        </para></listitem>
                                </varlistentry>

                                <varlistentry>
                                        <term><varname>Z</varname></term>
                                        <listitem><para>Recursively set
                                        ownership, access mode and relabel
                                        security context of a path and
                                        all its subdirectories (if it is a
                                        directory). Lines of this type accept
                                        shell-style globs in place of normal
                                        path names.</para></listitem>
                                </varlistentry>
                        </variablelist>
                </refsect2>

                <refsect2>
                        <title>Mode</title>

                        <para>The file access mode to use when
                        creating this file or directory. If omitted or
                        when set to - the default is used: 0755 for
                        directories, 0644 for all other file
                        objects. For z, Z lines if omitted or when set
                        to - the file access mode will not be
                        modified. This parameter is ignored for x, r,
                        R, L lines.</para>
                </refsect2>

                <refsect2>
                        <title>UID, GID</title>

                        <para>The user and group to use for this file
                        or directory. This may either be a numeric
                        user/group ID or a user or group name. If
                        omitted or when set to - the default 0 (root)
                        is used. For z, Z lines when omitted or when set to -
                        the file ownership will not be modified.
                        These parameters are ignored for x, r, R, L lines.</para>
                </refsect2>

                <refsect2>
                        <title>Age</title>
                        <para>The date field, when set, is used to
                        decide what files to delete when cleaning. If
                        a file or directory is older than the current
                        time minus the age field it is deleted. The
                        field format is a series of integers each
                        followed by one of the following
                        postfixes for the respective time units:</para>

                        <variablelist>
                                <varlistentry>
                                <term><varname>s</varname></term>
                                <term><varname>min</varname></term>
                                <term><varname>h</varname></term>
                                <term><varname>d</varname></term>
                                <term><varname>w</varname></term>
                                <term><varname>ms</varname></term>
                                <term><varname>m</varname></term>
                                <term><varname>us</varname></term></varlistentry>
                        </variablelist>

                        <para>If multiple integers and units are specified the time
                        values are summed up.</para>

                        <para>The age field only applies to lines starting with
                        d, D and x. If omitted or set to - no automatic clean-up
                        is done.</para>
                </refsect2>

                <refsect2>
                        <title>Argument</title>

                        <para>For L lines determines the destination
                        path of the symlink. For c, b determines the
                        major/minor of the device node, with major and
                        minor formatted as integers, separated by :,
                        e.g. "1:3". Ignored for all other lines.</para>
                </refsect2>

        </refsect1>

        <refsect1>
                <title>Example</title>
                <example>
                        <title>/etc/tmpfiles.d/screen.conf example</title>
                        <para><command>screen</command> needs two directories created at boot with specific modes and ownership.</para>

                        <programlisting>d /var/run/screens  1777 root root 10d
d /var/run/uscreens 0755 root root 10d12h</programlisting>
                </example>
        </refsect1>

        <refsect1>
                <title>See Also</title>
                <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>