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73e97bb064
With <para><filename>…</filename></para>, we get a separate "paragraph" for each line, i.e. entries separated by empty lines. This uses up a lot of space and was only done because docbook makes it hard to insert a newline. In some other places, <literallayout> was used, but then we cannot indent the source text (because the whitespace would end up in the final page). We can get the desired result with <simplelist>. With <simplelist> the items are indented in roff output, but not in html output. In some places this looks better then no indentation, and in others it would probably be better to have no indent. But this is a minor issue and we cannot control that. (I didn't convert all spots. There's a bunch of other man pages which have two lines, e.g. an executable and service file, and it doesn't matter there so much.)
356 lines
18 KiB
XML
356 lines
18 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-tmpfiles"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-tmpfiles</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-tmpfiles</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-tmpfiles</refname>
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<refname>systemd-tmpfiles-setup.service</refname>
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<refname>systemd-tmpfiles-setup-dev-early.service</refname>
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<refname>systemd-tmpfiles-setup-dev.service</refname>
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<refname>systemd-tmpfiles-clean.service</refname>
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<refname>systemd-tmpfiles-clean.timer</refname>
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<refpurpose>Creates, deletes and cleans up volatile
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and temporary files and directories</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-tmpfiles</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat"><replaceable>CONFIGFILE</replaceable></arg>
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</cmdsynopsis>
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<para>System units:
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<simplelist>
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<member><filename>systemd-tmpfiles-setup.service</filename></member>
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<member><filename>systemd-tmpfiles-setup-dev-early.service</filename></member>
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<member><filename>systemd-tmpfiles-setup-dev.service</filename></member>
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<member><filename>systemd-tmpfiles-clean.service</filename></member>
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<member><filename>systemd-tmpfiles-clean.timer</filename></member>
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</simplelist>
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</para>
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<para>User units:
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<simplelist>
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<member><filename>systemd-tmpfiles-setup.service</filename></member>
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<member><filename>systemd-tmpfiles-clean.service</filename></member>
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<member><filename>systemd-tmpfiles-clean.timer</filename></member>
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</simplelist>
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</para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-tmpfiles</command> creates, deletes, and cleans up volatile and temporary files
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and directories, using the configuration file format and location specified in
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<citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>. It must
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be invoked with one or more options <option>--create</option>, <option>--remove</option>, and
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<option>--clean</option>, to select the respective subset of operations.</para>
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<para>By default, directives from all configuration files are applied. When invoked with
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<option>--replace=<replaceable>PATH</replaceable></option>, arguments specified on the command line are
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used instead of the configuration file <replaceable>PATH</replaceable>. Otherwise, if one or more
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absolute filenames are passed on the command line, only the directives in these files are applied. If
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<literal>-</literal> is specified instead of a filename, directives are read from standard input. If only
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the basename of a configuration file is specified, all configuration directories as specified in
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<citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> are
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searched for a matching file and the file found that has the highest priority is executed.</para>
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<para>System services (<filename>systemd-tmpfiles-setup.service</filename>,
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<filename>systemd-tmpfiles-setup-dev-early.service</filename>,
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<filename>systemd-tmpfiles-setup-dev.service</filename>,
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<filename>systemd-tmpfiles-clean.service</filename>) invoke <command>systemd-tmpfiles</command> to create
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system files and to perform system wide cleanup. Those services read administrator-controlled
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configuration files in <filename>tmpfiles.d/</filename> directories. User services
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(<filename>systemd-tmpfiles-setup.service</filename>,
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<filename>systemd-tmpfiles-clean.service</filename>) also invoke <command>systemd-tmpfiles</command>, but
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it reads a separate set of files, which includes user-controlled files under
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<filename>~/.config/user-tmpfiles.d/</filename> and <filename>~/.local/share/user-tmpfiles.d/</filename>,
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and administrator-controlled files under <filename>/usr/share/user-tmpfiles.d/</filename>. Users may use
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this to create and clean up files under their control, but the system instance performs global cleanup
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and is not influenced by user configuration. Note that this means a time-based cleanup configured in the
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system instance, such as the one typically configured for <filename>/tmp/</filename>, will thus also
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affect files created by the user instance if they are placed in <filename>/tmp/</filename>, even if the
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user instance's time-based cleanup is turned off.</para>
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<para>To re-apply settings after configuration has been modified, simply restart
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<filename>systemd-tmpfiles-clean.service</filename>, which will apply any settings which can be safely
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executed at runtime. To debug <command>systemd-tmpfiles</command>, it may be useful to invoke it
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directly from the command line with increased log level (see <varname>$SYSTEMD_LOG_LEVEL</varname>
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below).</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--create</option></term>
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<listitem><para>If this option is passed, all files and
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directories marked with
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<varname>f</varname>,
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<varname>F</varname>,
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<varname>w</varname>,
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<varname>d</varname>,
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<varname>D</varname>,
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<varname>v</varname>,
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<varname>p</varname>,
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<varname>L</varname>,
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<varname>c</varname>,
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<varname>b</varname>,
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<varname>m</varname>
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in the configuration files are created or written to. Files
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and directories marked with
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<varname>z</varname>,
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<varname>Z</varname>,
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<varname>t</varname>,
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<varname>T</varname>,
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<varname>a</varname>, and
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<varname>A</varname> have their ownership, access mode and
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security labels set.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--clean</option></term>
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<listitem><para>If this option is passed, all files and
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directories with an age parameter configured will be cleaned
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up.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--remove</option></term>
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<listitem><para>If this option is passed, the contents of
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directories marked with <varname>D</varname> or
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<varname>R</varname>, and files or directories themselves
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marked with <varname>r</varname> or <varname>R</varname> are
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removed unless an exclusive or shared BSD lock is taken on them (see <citerefentry
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project='man-pages'><refentrytitle>flock</refentrytitle><manvolnum>2</manvolnum></citerefentry>).
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--user</option></term>
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<listitem><para>Execute "user" configuration, i.e. <filename>tmpfiles.d</filename>
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files in user configuration directories.</para>
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<xi:include href="version-info.xml" xpointer="v236"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--boot</option></term>
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<listitem><para>Also execute lines with an exclamation mark. Lines that are not safe to be executed
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on a running system may be marked in this way. <command>systemd-tmpfiles</command> is executed in
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early boot with <option>--boot</option> specified and will execute those lines. When invoked again
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later, it should be called without <option>--boot</option>.</para>
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<xi:include href="version-info.xml" xpointer="v209"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--graceful</option></term>
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<listitem><para>Ignore configuration lines pertaining to unknown users or groups. This option is
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intended to be used in early boot before all users or groups have been created.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--prefix=<replaceable>path</replaceable></option></term>
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<listitem><para>Only apply rules with paths that start with
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the specified prefix. This option can be specified multiple
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times.</para>
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<xi:include href="version-info.xml" xpointer="v212"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--exclude-prefix=<replaceable>path</replaceable></option></term>
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<listitem><para>Ignore rules with paths that start with the
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specified prefix. This option can be specified multiple
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times.</para>
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<xi:include href="version-info.xml" xpointer="v207"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-E</option></term>
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<listitem><para>A shortcut for <literal>--exclude-prefix=/dev --exclude-prefix=/proc
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--exclude-prefix=/run --exclude-prefix=/sys</literal>, i.e. exclude the hierarchies typically backed
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by virtual or memory file systems. This is useful in combination with <option>--root=</option>, if
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the specified directory tree contains an OS tree without these virtual/memory file systems mounted
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in, as it is typically not desirable to create any files and directories below these subdirectories
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if they are supposed to be overmounted during runtime.</para>
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<xi:include href="version-info.xml" xpointer="v247"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--root=<replaceable>root</replaceable></option></term>
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<listitem><para>Takes a directory path as an argument. All paths will be prefixed with the given alternate
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<replaceable>root</replaceable> path, including config search paths.</para>
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<para>When this option is used, the libc Name Service Switch (NSS) is bypassed for resolving users
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and groups. Instead the files <filename>/etc/passwd</filename> and <filename>/etc/group</filename>
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inside the alternate root are read directly. This means that users/groups not listed in these files
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will not be resolved, i.e. LDAP NIS and other complex databases are not considered.</para>
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<para>Consider combining this with <option>-E</option> to ensure the invocation does not create files
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or directories below mount points in the OS image operated on that are typically overmounted during
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runtime.</para>
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<xi:include href="version-info.xml" xpointer="v212"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--image=<replaceable>image</replaceable></option></term>
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<listitem><para>Takes a path to a disk image file or block device node. If specified all operations
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are applied to file system in the indicated disk image. This is similar to <option>--root=</option>
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but operates on file systems stored in disk images or block devices. The disk image should either
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contain just a file system or a set of file systems within a GPT partition table, following the
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<ulink url="https://uapi-group.org/specifications/specs/discoverable_partitions_specification">Discoverable Partitions
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Specification</ulink>. For further information on supported disk images, see
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<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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switch of the same name.</para>
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<para>Implies <option>-E</option>.</para>
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<xi:include href="version-info.xml" xpointer="v247"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="image-policy-open" />
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<varlistentry>
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<term><option>--replace=<replaceable>PATH</replaceable></option></term>
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<listitem><para>When this option is given, one or more positional arguments
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must be specified. All configuration files found in the directories listed in
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<citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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will be read, and the configuration given on the command line will be
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handled instead of and with the same priority as the configuration file
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<replaceable>PATH</replaceable>.</para>
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<para>This option is intended to be used when package installation scripts
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are running and files belonging to that package are not yet available on
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disk, so their contents must be given on the command line, but the admin
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configuration might already exist and should be given higher priority.
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</para>
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<xi:include href="version-info.xml" xpointer="v238"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="cat-config" />
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<xi:include href="standard-options.xml" xpointer="tldr" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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<para>It is possible to combine <option>--create</option>, <option>--clean</option>, and <option>--remove</option>
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in one invocation (in which case removal and cleanup are executed before creation of new files). For example,
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during boot the following command line is executed to ensure that all temporary and volatile directories are
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removed and created according to the configuration file:</para>
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<programlisting>systemd-tmpfiles --remove --create</programlisting>
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</refsect1>
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<refsect1>
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<title>Credentials</title>
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<para><command>systemd-tmpfiles</command> supports the service credentials logic as implemented by
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<varname>ImportCredential=</varname>/<varname>LoadCredential=</varname>/<varname>SetCredential=</varname>
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(see <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>1</manvolnum></citerefentry> for
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details). The following credentials are used when passed in:</para>
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<variablelist class='system-credentials'>
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<varlistentry>
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<term><varname>tmpfiles.extra</varname></term>
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<listitem><para> The contents of this credential may contain additional lines to operate on. The
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credential contents should follow the same format as any other <filename>tmpfiles.d/</filename>
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drop-in configuration file. If this credential is passed it is processed after all of the drop-in
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files read from the file system. The lines in the credential can hence augment existing lines of the
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OS, but not override them.</para>
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<xi:include href="version-info.xml" xpointer="v252"/></listitem>
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</varlistentry>
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</variablelist>
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<para>Note that by default the <filename>systemd-tmpfiles-setup.service</filename> unit file (and related
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unit files) is set up to inherit the <literal>tmpfiles.extra</literal> credential from the service
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manager.</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<xi:include href="common-variables.xml" xpointer="log-level" />
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<xi:include href="common-variables.xml" xpointer="log-color" />
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<xi:include href="common-variables.xml" xpointer="log-time" />
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<xi:include href="common-variables.xml" xpointer="log-location" />
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<xi:include href="common-variables.xml" xpointer="log-target" />
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<xi:include href="common-variables.xml" xpointer="pager" />
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<xi:include href="common-variables.xml" xpointer="less" />
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<xi:include href="common-variables.xml" xpointer="lesscharset" />
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<xi:include href="common-variables.xml" xpointer="lesssecure" />
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<xi:include href="common-variables.xml" xpointer="colors" />
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<xi:include href="common-variables.xml" xpointer="urlify" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Unprivileged --cleanup operation</title>
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<para><command>systemd-tmpfiles</command> tries to avoid changing
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the access and modification times on the directories it accesses,
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which requires <constant>CAP_FOWNER</constant> privileges. When
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running as non-root, directories which are checked for files to
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clean up will have their access time bumped, which might prevent
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their cleanup.
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</para>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned. If the configuration was syntactically invalid (syntax errors, missing
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arguments, …), so some lines had to be ignored, but no other errors occurred, <constant>65</constant> is
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returned (<constant>EX_DATAERR</constant> from <filename>/usr/include/sysexits.h</filename>). If the
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configuration was syntactically valid, but could not be executed (lack of permissions, creation of files
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in missing directories, invalid contents when writing to <filename>/sys/</filename> values, …),
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<constant>73</constant> is returned (<constant>EX_CANTCREAT</constant> from
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<filename>/usr/include/sysexits.h</filename>). Otherwise, <constant>1</constant> is returned
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(<constant>EXIT_FAILURE</constant> from <filename>/usr/include/stdlib.h</filename>).</para>
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<para>Note: when creating items, if the target already exists, but is of the wrong type or otherwise does
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not match the requested state, and forced operation has not been requested with <literal>+</literal>,
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a message is emitted, but the failure is otherwise ignored.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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