796 lines
43 KiB
XML
796 lines
43 KiB
XML
<?xml version='1.0'?>
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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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<!--
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SPDX-License-Identifier: LGPL-2.1-or-later
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Copyright © 2010 Brandon Philips
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-->
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<refentry id="tmpfiles.d"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>tmpfiles.d</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>tmpfiles.d</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>tmpfiles.d</refname>
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<refpurpose>Configuration for creation, deletion and cleaning of
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volatile and temporary files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><literallayout><filename>/etc/tmpfiles.d/*.conf</filename>
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<filename>/run/tmpfiles.d/*.conf</filename>
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<filename>/usr/lib/tmpfiles.d/*.conf</filename>
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</literallayout></para>
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<para><literallayout><filename>~/.config/user-tmpfiles.d/*.conf</filename>
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<filename>$XDG_RUNTIME_DIR/user-tmpfiles.d/*.conf</filename>
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<filename>~/.local/share/user-tmpfiles.d/*.conf</filename>
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<filename index='false'>…</filename>
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<filename>/usr/share/user-tmpfiles.d/*.conf</filename>
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</literallayout></para>
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<programlisting>#Type Path Mode User Group Age Argument
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f /file/to/create mode user group - content
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f+ /file/to/create-or-truncate mode user group - content
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w /file/to/write-to - - - - content
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w+ /file/to/append-to - - - - content
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d /directory/to/create-and-cleanup mode user group cleanup-age -
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D /directory/to/create-and-remove mode user group cleanup-age -
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e /directory/to/cleanup mode user group cleanup-age -
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v /subvolume-or-directory/to/create mode user group - -
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q /subvolume-or-directory/to/create mode user group - -
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Q /subvolume-or-directory/to/create mode user group - -
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p /fifo/to/create mode user group - -
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p+ /fifo/to/[re]create mode user group - -
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L /symlink/to/create - - - - symlink/target/path
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L+ /symlink/to/[re]create - - - - symlink/target/path
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c /dev/char-device-to-create mode user group - major:minor
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c+ /dev/char-device-to-[re]create mode user group - major:minor
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b /dev/block-device-to-create mode user group - major:minor
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b+ /dev/block-device-to-[re]create mode user group - major:minor
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C /target/to/create - - - - /source/to/copy
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x /path-or-glob/to/ignore - - - - -
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X /path-or-glob/to/ignore/recursively - - - - -
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r /empty/dir/to/remove - - - - -
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R /dir/to/remove/recursively - - - - -
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z /path-or-glob/to/adjust/mode mode user group - -
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Z /path-or-glob/to/adjust/mode/recursively mode user group - -
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t /path-or-glob/to/set/xattrs - - - - xattrs
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T /path-or-glob/to/set/xattrs/recursively - - - - xattrs
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h /path-or-glob/to/set/attrs - - - - file attrs
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H /path-or-glob/to/set/attrs/recursively - - - - file attrs
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a /path-or-glob/to/set/acls - - - - POSIX ACLs
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a+ /path-or-glob/to/append/acls - - - - POSIX ACLs
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A /path-or-glob/to/set/acls/recursively - - - - POSIX ACLs
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A+ /path-or-glob/to/append/acls/recursively - - - - POSIX ACLs
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</programlisting>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>tmpfiles.d</filename> configuration files provide a generic mechanism to define the
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<emphasis>creation</emphasis> of regular files, directories, pipes, and device nodes, adjustments to
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their <emphasis>access mode, ownership, attributes, quota assignments, and contents</emphasis>, and
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finally their time-based <emphasis>removal</emphasis>. It is mostly commonly used for volatile and
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temporary files and directories (such as those located under <filename>/run/</filename>,
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<filename>/tmp/</filename>, <filename>/var/tmp/</filename>, the API file systems such as
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<filename>/sys/</filename> or <filename>/proc/</filename>, as well as some other directories below
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<filename>/var/</filename>).</para>
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<para><command>systemd-tmpfiles</command> uses this configuration to create volatile files and
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directories during boot and to do periodic cleanup afterwards. See
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<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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the description of <filename>systemd-tmpfiles-setup.service</filename>,
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<filename>systemd-tmpfiles-clean.service</filename>, and associated units.</para>
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<para>System daemons frequently require private runtime directories below <filename>/run/</filename> to
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store communication sockets and similar. For these, it is better to use
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<varname>RuntimeDirectory=</varname> in their unit files (see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details), if the flexibility provided by <filename>tmpfiles.d</filename> is not required. The advantages
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are that the configuration required by the unit is centralized in one place, and that the lifetime of the
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directory is tied to the lifetime of the service itself. Similarly, <varname>StateDirectory=</varname>,
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<varname>CacheDirectory=</varname>, <varname>LogsDirectory=</varname>, and
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<varname>ConfigurationDirectory=</varname> should be used to create directories under
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<filename>/var/lib/</filename>, <filename>/var/cache/</filename>, <filename>/var/log/</filename>, and
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<filename>/etc/</filename>. <filename>tmpfiles.d</filename> should be used for files whose lifetime is
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independent of any service or requires more complicated configuration.</para>
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</refsect1>
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<refsect1>
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<title>Configuration Directories and Precedence</title>
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<para>Each configuration file shall be named in the style of
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<filename><replaceable>package</replaceable>.conf</filename> or
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<filename><replaceable>package</replaceable>-<replaceable>part</replaceable>.conf</filename>.
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The second variant should be used when it is desirable to make it
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easy to override just this part of configuration.</para>
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<para>Files in <filename>/etc/tmpfiles.d</filename> override files with the same name in
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<filename>/usr/lib/tmpfiles.d</filename> and <filename>/run/tmpfiles.d</filename>. Files in
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<filename>/run/tmpfiles.d</filename> override files with the same name in
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<filename>/usr/lib/tmpfiles.d</filename>. Packages should install their configuration files in
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<filename>/usr/lib/tmpfiles.d</filename>. Files in <filename>/etc/tmpfiles.d</filename> are reserved for
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the local administrator, who may use this logic to override the configuration files installed by vendor
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packages. All configuration files are sorted by their filename in lexicographic order, regardless of
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which of the directories they reside in. If multiple files specify the same path, the entry in the file
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with the lexicographically earliest name will be applied (note that lines suppressed due to the
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<literal>!</literal> are filtered before application, meaning that if an early line carries the
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exclamation mark and is suppressed because of that, a later line matching in path will be applied). All
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other conflicting entries will be logged as errors. When two lines are prefix path and suffix path of
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each other, then the prefix line is always created first, the suffix later (and if removal applies to the
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line, the order is reversed: the suffix is removed first, the prefix later). Lines that take globs are
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applied after those accepting no globs. If multiple operations shall be applied on the same file (such as
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ACL, xattr, file attribute adjustments), these are always done in the same fixed order. Except for those
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cases, the files/directories are processed in the order they are listed.</para>
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<para>If the administrator wants to disable a configuration file
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supplied by the vendor, the recommended way is to place a symlink
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to <filename>/dev/null</filename> in
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<filename>/etc/tmpfiles.d/</filename> bearing the same filename.
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</para>
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</refsect1>
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<refsect1>
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<title>Configuration File Format</title>
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<para>The configuration format is one line per path containing
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type, path, mode, ownership, age, and argument fields:</para>
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<programlisting>#Type Path Mode User Group Age Argument
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d /run/user 0755 root root 10d -
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L /tmp/foobar - - - - /dev/null</programlisting>
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<para>Fields may be enclosed within quotes and contain C-style escapes.</para>
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<refsect2>
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<title>Type</title>
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<para>The type consists of a single letter and optionally an exclamation mark (<literal>!</literal>)
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and/or minus sign (<literal>-</literal>).</para>
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<para>The following line types are understood:</para>
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<variablelist>
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<varlistentry>
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<term><varname>f</varname></term>
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<term><varname>f+</varname></term>
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<listitem><para><varname>f</varname> will create a file if it does not exist yet. If the argument
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parameter is given and the file did not exist yet, it will be written to the file.
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<varname>f+</varname> will create or truncate the file. If the argument parameter is given, it will
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be written to the file. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>w</varname></term>
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<term><varname>w+</varname></term>
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<listitem><para>Write the argument parameter to a file, if the file exists.
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If suffixed with <varname>+</varname>, the line will be appended to the file.
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If your configuration writes multiple lines to the same file, use <varname>w+</varname>.
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Lines of this type accept shell-style globs in place of normal path names.
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The argument parameter will be written without a trailing newline.
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C-style backslash escapes are interpreted. Follows symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>d</varname></term>
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<listitem><para>Create a directory. The mode and ownership will be adjusted if specified. Contents
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of this directory are subject to time based cleanup if the age argument is specified.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>D</varname></term>
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<listitem><para>Similar to <varname>d</varname>, but in addition the contents of the directory will
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be removed when <option>--remove</option> is used.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>e</varname></term>
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<listitem><para>Adjust the mode and ownership of existing directories and remove their contents
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based on age.
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Lines of this type accept shell-style globs in place of normal path names. Contents of the
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directories are subject to time based cleanup if the age argument is specified. If the age argument
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is <literal>0</literal>, contents will be unconditionally deleted every time
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<command>systemd-tmpfiles --clean</command> is run.</para>
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<para>For this entry to be useful, at least one of the mode, user, group, or age arguments must be
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specified, since otherwise this entry has no effect. As an exception, an entry with no effect may
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be useful when combined with <varname>!</varname>, see the examples.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>v</varname></term>
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<listitem><para>Create a subvolume if the path does not exist yet, the file system supports
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subvolumes (btrfs), and the system itself is installed into a subvolume (specifically: the root
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directory <filename>/</filename> is itself a subvolume). Otherwise, create a normal directory, in
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the same way as <varname>d</varname>.</para>
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<para>A subvolume created with this line type is not assigned to any higher-level quota group. For
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that, use <varname>q</varname> or <varname>Q</varname>, which allow creating simple quota group
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hierarchies, see below.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>q</varname></term>
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<listitem><para>Create a subvolume or directory the same as <varname>v</varname>, but assign the
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subvolume to the same higher-level quota groups as the parent. This ensures that higher-level
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limits and accounting applied to the parent subvolume also include the specified subvolume. On
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non-btrfs file systems, this line type is identical to <varname>d</varname>.</para>
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<para>If the subvolume already exists, no change to the quota hierarchy is made, regardless of whether the
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subvolume is already attached to a quota group or not. Also see <varname>Q</varname> below. See <citerefentry
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project='die-net'><refentrytitle>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry> for
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details about the btrfs quota group concept.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Q</varname></term>
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<listitem><para>Create the subvolume or directory the same as <varname>v</varname>, but assign the
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new subvolume to a new leaf quota group. Instead of copying the higher-level quota group
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assignments from the parent as is done with <varname>q</varname>, the lowest quota group of the
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parent subvolume is determined that is not the leaf quota group. Then, an "intermediary" quota
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group is inserted that is one level below this level, and shares the same ID part as the specified
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subvolume. If no higher-level quota group exists for the parent subvolume, a new quota group at
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level 255 sharing the same ID as the specified subvolume is inserted instead. This new intermediary
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quota group is then assigned to the parent subvolume's higher-level quota groups, and the specified
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subvolume's leaf quota group is assigned to it.</para>
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<para>Effectively, this has a similar effect as <varname>q</varname>, however introduces a new higher-level
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quota group for the specified subvolume that may be used to enforce limits and accounting to the specified
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subvolume and children subvolume created within it. Thus, by creating subvolumes only via
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<varname>q</varname> and <varname>Q</varname>, a concept of "subtree quotas" is implemented. Each subvolume
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for which <varname>Q</varname> is set will get a "subtree" quota group created, and all child subvolumes
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created within it will be assigned to it. Each subvolume for which <varname>q</varname> is set will not get
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such a "subtree" quota group, but it is ensured that they are added to the same "subtree" quota group as
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their immediate parents.</para>
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<para>It is recommended to use <varname>Q</varname> for subvolumes that typically contain further subvolumes,
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and where it is desirable to have accounting and quota limits on all child subvolumes together. Examples for
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<varname>Q</varname> are typically <filename>/home/</filename> or <filename>/var/lib/machines/</filename>. In
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contrast, <varname>q</varname> should be used for subvolumes that either usually do not include further
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subvolumes or where no accounting and quota limits are needed that apply to all child subvolumes
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together. Examples for <varname>q</varname> are typically <filename>/var/</filename> or
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<filename>/var/tmp/</filename>. </para>
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<para>As with <varname>q</varname>, <varname>Q</varname> has no effect on the quota group hierarchy if the
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subvolume already exists, regardless of whether the subvolume already belong to a quota group or not.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>p</varname></term>
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<term><varname>p+</varname></term>
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<listitem><para>Create a named pipe (FIFO) if it does not
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exist yet. If suffixed with <varname>+</varname> and a file
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already exists where the pipe is to be created, it will be
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removed and be replaced by the pipe.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>L</varname></term>
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<term><varname>L+</varname></term>
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<listitem><para>Create a symlink if it does not exist
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yet. If suffixed with <varname>+</varname> and a file or
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directory already exists where the symlink is to be created,
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it will be removed and be replaced by the symlink. If the
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argument is omitted, symlinks to files with the same name
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residing in the directory
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<filename>/usr/share/factory/</filename> are created. Note
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that permissions and ownership on symlinks are ignored.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>c</varname></term>
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<term><varname>c+</varname></term>
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<listitem><para>Create a character device node if it does
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not exist yet. If suffixed with <varname>+</varname> and a
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file already exists where the device node is to be created,
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it will be removed and be replaced by the device node. It is
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recommended to suffix this entry with an exclamation mark to
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only create static device nodes at boot, as udev will not
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manage static device nodes that are created at runtime.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>b</varname></term>
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<term><varname>b+</varname></term>
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<listitem><para>Create a block device node if it does not
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exist yet. If suffixed with <varname>+</varname> and a file
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already exists where the device node is to be created, it
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will be removed and be replaced by the device node. It is
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recommended to suffix this entry with an exclamation mark to
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only create static device nodes at boot, as udev will not
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manage static device nodes that are created at runtime.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>C</varname></term>
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<listitem><para>Recursively copy a file or directory, if the
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destination files or directories do not exist yet or the
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destination directory is empty. Note that this command will not
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descend into subdirectories if the destination directory already
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exists and is not empty. Instead, the entire copy operation is
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skipped. If the argument is omitted, files from the source directory
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<filename>/usr/share/factory/</filename> with the same name
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are copied. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>x</varname></term>
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<listitem><para>Ignore a path during cleaning. Use this type
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to exclude paths from clean-up as controlled with the Age
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parameter. Note that lines of this type do not influence the
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effect of <varname>r</varname> or <varname>R</varname>
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lines. Lines of this type accept shell-style globs in place
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of normal path names. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>X</varname></term>
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<listitem><para>Ignore a path during cleaning. Use this type
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to exclude paths from clean-up as controlled with the Age
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parameter. Unlike <varname>x</varname>, this parameter will
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not exclude the content if path is a directory, but only
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directory itself. Note that lines of this type do not
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influence the effect of <varname>r</varname> or
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<varname>R</varname> lines. Lines of this type accept
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shell-style globs in place of normal path names.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>r</varname></term>
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<listitem><para>Remove a file or directory if it exists.
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This may not be used to remove non-empty directories, use
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<varname>R</varname> for that. Lines of this type accept
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shell-style globs in place of normal path
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names. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>R</varname></term>
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<listitem><para>Recursively remove a path and all its
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subdirectories (if it is a directory). Lines of this type
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accept shell-style globs in place of normal path
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names. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>z</varname></term>
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<listitem><para>Adjust the access mode, user and group ownership, and restore the SELinux security
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context of a file or directory, if it exists. Lines of this type accept shell-style globs in place
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of normal path names. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Z</varname></term>
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<listitem><para>Recursively set the access mode, user and group ownership, and restore the SELinux
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security context of a file or directory if it exists, as well as of its subdirectories and the
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files contained therein (if applicable). Lines of this type accept shell-style globs in place of
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normal path names. Does not follow symlinks.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>t</varname></term>
|
|
<listitem><para>Set extended attributes, see <citerefentry
|
|
project='man-pages'><refentrytitle>attr</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry> for details. The argument field should take one or more
|
|
assignment expressions in the form
|
|
<replaceable>namespace</replaceable>.<replaceable>attribute</replaceable>=<replaceable>value</replaceable>,
|
|
for examples see below. Lines of this type accept shell-style globs in place of normal path
|
|
names. This can be useful for setting SMACK labels. Does not follow symlinks.</para>
|
|
|
|
<para>Please note that extended attributes settable with this line type are a different concept
|
|
from the Linux file attributes settable with <varname>h</varname>/<varname>H</varname>, see
|
|
below.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>T</varname></term>
|
|
<listitem><para>Same as <varname>t</varname>, but operates recursively.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>h</varname></term>
|
|
<listitem><para>Set Linux file/directory attributes. Lines of this type accept shell-style globs in
|
|
place of normal path names.</para>
|
|
|
|
<para>The format of the argument field is <varname>[+-=][aAcCdDeijPsStTu]</varname>. The prefix
|
|
<varname>+</varname> (the default one) causes the attribute(s) to be added; <varname>-</varname>
|
|
causes the attribute(s) to be removed; <varname>=</varname> causes the attributes to be set exactly
|
|
as the following letters. The letters <literal>aAcCdDeijPsStTu</literal> select the new attributes
|
|
for the files, see <citerefentry project='man-pages'><refentrytitle>chattr</refentrytitle>
|
|
<manvolnum>1</manvolnum></citerefentry> for further information.
|
|
</para>
|
|
|
|
<para>Passing only <varname>=</varname> as argument resets all the file attributes listed above. It
|
|
has to be pointed out that the <varname>=</varname> prefix limits itself to the attributes
|
|
corresponding to the letters listed here. All other attributes will be left untouched. Does not
|
|
follow symlinks.</para>
|
|
|
|
<para>Please note that the Linux file attributes settable with this line type are a different
|
|
concept from the extended attributes settable with <varname>t</varname>/<varname>T</varname>,
|
|
see above.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>H</varname></term>
|
|
<listitem><para>Sames as <varname>h</varname>, but operates recursively.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>a</varname></term>
|
|
<term><varname>a+</varname></term>
|
|
<listitem><para>Set POSIX ACLs (access control lists), see <citerefentry
|
|
project='man-pages'><refentrytitle>acl</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry>. If suffixed with <varname>+</varname>, the specified
|
|
entries will be added to the existing set. <command>systemd-tmpfiles</command> will automatically
|
|
add the required base entries for user and group based on the access mode of the file, unless base
|
|
entries already exist or are explicitly specified. The mask will be added if not specified
|
|
explicitly or already present. Lines of this type accept shell-style globs in place of normal path
|
|
names. This can be useful for allowing additional access to certain files. Does not follow
|
|
symlinks.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>A</varname></term>
|
|
<term><varname>A+</varname></term>
|
|
<listitem><para>Same as <varname>a</varname> and
|
|
<varname>a+</varname>, but recursive. Does not follow
|
|
symlinks.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
<para>If the exclamation mark (<literal>!</literal>) is used, this line is only safe to execute during
|
|
boot, and can break a running system. Lines without the exclamation mark are presumed to be safe to
|
|
execute at any time, e.g. on package upgrades. <command>systemd-tmpfiles</command> will take lines with
|
|
an exclamation mark only into consideration, if the <option>--boot</option> option is given.</para>
|
|
|
|
<para>For example:
|
|
<programlisting># Make sure these are created by default so that nobody else can
|
|
d /tmp/.X11-unix 1777 root root 10d
|
|
|
|
# Unlink the X11 lock files
|
|
r! /tmp/.X[0-9]*-lock</programlisting>
|
|
The second line in contrast to the first one would break a
|
|
running system, and will only be executed with
|
|
<option>--boot</option>.</para>
|
|
|
|
<para>If the minus sign (<literal>-</literal>) is used, this line failing to run successfully during
|
|
create (and only create) will not cause the execution of <command>systemd-tmpfiles</command> to return
|
|
an error.</para>
|
|
|
|
<para>For example:
|
|
<programlisting># Modify sysfs but don't fail if we are in a container with a read-only /proc
|
|
w- /proc/sys/vm/swappiness - - - - 10</programlisting></para>
|
|
|
|
<para>Note that for all line types that result in creation of any kind of file node
|
|
(i.e. <varname>f</varname>/<varname>F</varname>,
|
|
<varname>d</varname>/<varname>D</varname>/<varname>v</varname>/<varname>q</varname>/<varname>Q</varname>,
|
|
<varname>p</varname>, <varname>L</varname>, <varname>c</varname>/<varname>b</varname> and <varname>C</varname>)
|
|
leading directories are implicitly created if needed, owned by root with an access mode of 0755. In order to
|
|
create them with different modes or ownership make sure to add appropriate <varname>d</varname> lines.</para>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Path</title>
|
|
|
|
<para>The file system path specification supports simple
|
|
specifier expansion, see below. The path (after expansion) must be
|
|
absolute.</para>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Mode</title>
|
|
|
|
<para>The file access mode to use when creating this file or
|
|
directory. If omitted or when set to <literal>-</literal>, the
|
|
default is used: 0755 for directories, 0644 for all other file
|
|
objects. For <varname>z</varname>, <varname>Z</varname> lines,
|
|
if omitted or when set to <literal>-</literal>, the file access
|
|
mode will not be modified. This parameter is ignored for
|
|
<varname>x</varname>, <varname>r</varname>,
|
|
<varname>R</varname>, <varname>L</varname>, <varname>t</varname>,
|
|
and <varname>a</varname> lines.</para>
|
|
|
|
<para>Optionally, if prefixed with <literal>~</literal>, the
|
|
access mode is masked based on the already set access bits for
|
|
existing file or directories: if the existing file has all
|
|
executable bits unset, all executable bits are removed from the
|
|
new access mode, too. Similarly, if all read bits are removed
|
|
from the old access mode, they will be removed from the new
|
|
access mode too, and if all write bits are removed, they will be
|
|
removed from the new access mode too. In addition, the
|
|
sticky/SUID/SGID bit is removed unless applied to a
|
|
directory. This functionality is particularly useful in
|
|
conjunction with <varname>Z</varname>.</para>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>User, Group</title>
|
|
|
|
<para>The user and group to use for this file or directory. This may either be a numeric ID or a
|
|
user/group name. If omitted or when set to <literal>-</literal>, the user and group of the user who
|
|
invokes <command>systemd-tmpfiles</command> is used. For <varname>z</varname> and <varname>Z</varname>
|
|
lines, when omitted or when set to <literal>-</literal>, the file ownership will not be modified. These
|
|
parameters are ignored for <varname>x</varname>, <varname>r</varname>, <varname>R</varname>,
|
|
<varname>L</varname>, <varname>t</varname>, and <varname>a</varname> lines.</para>
|
|
|
|
<para>This field should generally only reference system users/groups, i.e. users/groups that are
|
|
guaranteed to be resolvable during early boot. If this field references users/groups that only become
|
|
resolveable during later boot (i.e. after NIS, LDAP or a similar networked directory service become
|
|
available), execution of the operations declared by the line will likely fail. Also see <ulink
|
|
url="https://systemd.io/UIDS-GIDS/#notes-on-resolvability-of-user-and-group-names">Notes on
|
|
Resolvability of User and Group Names</ulink> for more information on requirements on system user/group
|
|
definitions.</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 suffixes for the respective time units:
|
|
<constant>s</constant>,
|
|
<constant>m</constant> or <constant>min</constant>,
|
|
<constant>h</constant>,
|
|
<constant>d</constant>,
|
|
<constant>w</constant>,
|
|
<constant>ms</constant>, and
|
|
<constant>us</constant>,
|
|
meaning seconds, minutes, hours, days, weeks,
|
|
milliseconds, and microseconds, respectively. Full names of the time units can
|
|
be used too.
|
|
</para>
|
|
|
|
<para>If multiple integers and units are specified, the time
|
|
values are summed. If an integer is given without a unit,
|
|
<constant>s</constant> is assumed.
|
|
</para>
|
|
|
|
<para>When the age is set to zero, the files are cleaned
|
|
unconditionally.</para>
|
|
|
|
<para>The age field only applies to lines starting with
|
|
<varname>d</varname>, <varname>D</varname>, <varname>e</varname>,
|
|
<varname>v</varname>, <varname>q</varname>,
|
|
<varname>Q</varname>, <varname>C</varname>, <varname>x</varname>
|
|
and <varname>X</varname>. If omitted or set to
|
|
<literal>-</literal>, no automatic clean-up is done.</para>
|
|
|
|
<para>If the age field starts with a tilde character
|
|
<literal>~</literal>, the clean-up is only applied to files and
|
|
directories one level inside the directory specified, but not
|
|
the files and directories immediately inside it.</para>
|
|
|
|
<para>The age of a file system entry is determined from its last
|
|
modification timestamp (mtime), its last access timestamp (atime),
|
|
and (except for directories) its last status change timestamp
|
|
(ctime). Any of these three (or two) values will prevent cleanup
|
|
if it is more recent than the current time minus the age
|
|
field.</para>
|
|
|
|
<para>Note that while the aging algorithm is run a 'shared' BSD file lock (see <citerefentry
|
|
project='man-pages'><refentrytitle>flock</refentrytitle><manvolnum>2</manvolnum></citerefentry>) is
|
|
taken on each directory the algorithm descends into (and each directory below that, and so on). If the
|
|
aging algorithm finds a lock is already taken on some directory, it (and everything below it) is
|
|
skipped. Applications may use this to temporarily exclude certain directory subtrees from the aging
|
|
algorithm: the applications can take a BSD file lock themselves, and as long as they keep it aging of
|
|
the directory and everything below it is disabled.</para>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Argument</title>
|
|
|
|
<para>For <varname>L</varname> lines determines the destination path of the symlink. For <varname>c</varname> and
|
|
<varname>b</varname>, determines the major/minor of the device node, with major and minor formatted as integers,
|
|
separated by <literal>:</literal>, e.g. <literal>1:3</literal>. For <varname>f</varname>, <varname>F</varname>,
|
|
and <varname>w</varname>, the argument may be used to specify a short string that is written to the file,
|
|
suffixed by a newline. For <varname>C</varname>, specifies the source file or directory. For <varname>t</varname>
|
|
and <varname>T</varname>, determines extended attributes to be set. For <varname>a</varname> and
|
|
<varname>A</varname>, determines ACL attributes to be set. For <varname>h</varname> and <varname>H</varname>,
|
|
determines the file attributes to set. Ignored for all other lines.</para>
|
|
|
|
<para>This field can contain specifiers, see below.</para>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Specifiers</title>
|
|
|
|
<para>Specifiers can be used in the "path" and "argument" fields.
|
|
An unknown or unresolvable specifier is treated as invalid configuration.
|
|
The following expansions are understood:</para>
|
|
<table class='specifiers'>
|
|
<title>Specifiers available</title>
|
|
<tgroup cols='3' align='left' colsep='1' rowsep='1'>
|
|
<colspec colname="spec" />
|
|
<colspec colname="mean" />
|
|
<colspec colname="detail" />
|
|
<thead>
|
|
<row>
|
|
<entry>Specifier</entry>
|
|
<entry>Meaning</entry>
|
|
<entry>Details</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<xi:include href="standard-specifiers.xml" xpointer="a"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="b"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="B"/>
|
|
<row>
|
|
<entry><literal>%C</literal></entry>
|
|
<entry>System or user cache directory</entry>
|
|
<entry>In <option>--user</option> mode, this is the same as <varname>$XDG_CACHE_HOME</varname>, and <filename>/var/cache</filename> otherwise.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><literal>%g</literal></entry>
|
|
<entry>User group</entry>
|
|
<entry>This is the name of the group running the command. In case of the system instance this resolves to <literal>root</literal>.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><literal>%G</literal></entry>
|
|
<entry>User GID</entry>
|
|
<entry>This is the numeric GID of the group running the command. In case of the system instance this resolves to <constant>0</constant>.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><literal>%h</literal></entry>
|
|
<entry>User home directory</entry>
|
|
<entry>This is the home directory of the user running the command. In case of the system instance this resolves to <literal>/root</literal>.</entry>
|
|
</row>
|
|
<xi:include href="standard-specifiers.xml" xpointer="H"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="l"/>
|
|
<row>
|
|
<entry><literal>%L</literal></entry>
|
|
<entry>System or user log directory</entry>
|
|
<entry>In <option>--user</option> mode, this is the same as <varname>$XDG_CONFIG_HOME</varname> with <filename index="false">/log</filename> appended, and <filename>/var/log</filename> otherwise.</entry>
|
|
</row>
|
|
<xi:include href="standard-specifiers.xml" xpointer="m"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="o"/>
|
|
<row>
|
|
<entry><literal>%S</literal></entry>
|
|
<entry>System or user state directory</entry>
|
|
<entry>In <option>--user</option> mode, this is the same as <varname>$XDG_CONFIG_HOME</varname>, and <filename>/var/lib</filename> otherwise.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><literal>%t</literal></entry>
|
|
<entry>System or user runtime directory</entry>
|
|
<entry>In <option>--user</option> mode, this is the same <varname>$XDG_RUNTIME_DIR</varname>, and <filename>/run/</filename> otherwise.</entry>
|
|
</row>
|
|
<xi:include href="standard-specifiers.xml" xpointer="T"/>
|
|
<row>
|
|
<entry><literal>%u</literal></entry>
|
|
<entry>User name</entry>
|
|
<entry>This is the name of the user running the command. In case of the system instance this resolves to <literal>root</literal>.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><literal>%U</literal></entry>
|
|
<entry>User UID</entry>
|
|
<entry>This is the numeric UID of the user running the command. In case of the system instance this resolves to <constant>0</constant>.</entry>
|
|
</row>
|
|
<xi:include href="standard-specifiers.xml" xpointer="v"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="V"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="w"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="W"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="percent"/>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Examples</title>
|
|
<example>
|
|
<title>Create directories with specific mode and ownership</title>
|
|
<para>
|
|
<citerefentry project='die-net'><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
needs two directories created at boot with specific modes and ownership:</para>
|
|
|
|
<programlisting># /usr/lib/tmpfiles.d/screen.conf
|
|
d /run/screens 1777 root screen 10d
|
|
d /run/uscreens 0755 root screen 10d12h
|
|
</programlisting>
|
|
|
|
<para>Contents of <filename>/run/screens</filename> and /run/uscreens will
|
|
be cleaned up after 10 and 10½ days, respectively.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Create a directory with a SMACK attribute</title>
|
|
<programlisting>D /run/cups - - - -
|
|
t /run/cups - - - - security.SMACK64=printing user.attr-with-spaces="foo bar"
|
|
</programlisting>
|
|
|
|
<para>The directory will be owned by root and have default mode. Its contents are
|
|
not subject to time based cleanup, but will be obliterated when
|
|
<command>systemd-tmpfiles --remove</command> runs.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Create a directory and prevent its contents from cleanup</title>
|
|
<para>
|
|
<citerefentry project='die-net'><refentrytitle>abrt</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
needs a directory created at boot with specific mode and ownership and its content
|
|
should be preserved from the automatic cleanup applied to the contents of
|
|
<filename>/var/tmp</filename>:</para>
|
|
|
|
<programlisting># /usr/lib/tmpfiles.d/tmp.conf
|
|
d /var/tmp 1777 root root 30d
|
|
</programlisting>
|
|
|
|
<programlisting># /usr/lib/tmpfiles.d/abrt.conf
|
|
d /var/tmp/abrt 0755 abrt abrt -
|
|
</programlisting>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Apply clean up during boot and based on time</title>
|
|
|
|
<programlisting># /usr/lib/tmpfiles.d/dnf.conf
|
|
r! /var/cache/dnf/*/*/download_lock.pid
|
|
r! /var/cache/dnf/*/*/metadata_lock.pid
|
|
r! /var/lib/dnf/rpmdb_lock.pid
|
|
e /var/cache/dnf/ - - - 30d
|
|
</programlisting>
|
|
|
|
<para>The lock files will be removed during boot. Any files and directories in
|
|
<filename>/var/cache/dnf/</filename> will be removed after they have not been
|
|
accessed in 30 days.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Empty the contents of a cache directory on boot</title>
|
|
|
|
<programlisting># /usr/lib/tmpfiles.d/krb5rcache.conf
|
|
e! /var/cache/krb5rcache - - - 0
|
|
</programlisting>
|
|
|
|
<para>Any files and subdirectories in <filename>/var/cache/krb5rcache/</filename>
|
|
will be removed on boot. The directory will not be created.
|
|
</para>
|
|
</example>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title><filename>/run/</filename> and <filename>/var/run/</filename></title>
|
|
<para><filename>/var/run/</filename> is a deprecated symlink to <filename>/run/</filename>, and
|
|
applications should use the latter. <command>systemd-tmpfiles</command> will warn if
|
|
<filename>/var/run/</filename> is used.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>attr</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>getfattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>setfattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>setfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>getfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>chattr</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry project='die-net'><refentrytitle>btrfs-subvolume</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry project='die-net'><refentrytitle>btrfs-qgroup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|