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296 lines
14 KiB
XML
296 lines
14 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-mount"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-mount</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-mount</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-mount</refname>
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<refpurpose>Establish a mount or auto-mount point transiently</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-mount</command>
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<arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
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<arg choice="plain"><replaceable>WHAT</replaceable></arg>
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<arg choice="opt"><replaceable>WHERE</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-mount</command>
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<arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
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<arg choice="plain"><option>--list</option></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-mount</command> may be used to create and start a transient <filename>.mount</filename> or
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<filename>.automount</filename> unit of the file system <replaceable>WHAT</replaceable> on the mount point
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<replaceable>WHERE</replaceable>.</para>
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<para>In many ways, <command>systemd-mount</command> is similar to the lower-level
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<citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> command, however instead
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of executing the mount operation directly and immediately, <command>systemd-mount</command> schedules it through
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the service manager job queue, so that it may pull in further dependencies (such as parent mounts, or a file system
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checker to execute a priori), and may make use of the auto-mounting logic.</para>
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<para>The command takes either one or two arguments. If only one argument is specified it should refer to a block
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device containing a file system (e.g. <literal>/dev/sdb1</literal>), which is then probed for a label and other
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metadata, and is mounted to a directory whose name is generated from the label. In this mode the block device must
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exist at the time of invocation of the command, so that it may be probed. If the device is found to be a removable
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block device (e.g. a USB stick) an automount point instead of a regular mount point is created (i.e. the
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<option>--automount=</option> option is implied, see below).</para>
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<para>If two arguments are specified the first indicates the mount source (the <replaceable>WHAT</replaceable>) and
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the second indicates the path to mount it on (the <replaceable>WHERE</replaceable>). In this mode no probing of the
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source is attempted, and a backing device node doesn't have to exist yet. However, if this mode is combined with
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<option>--discover</option>, device node probing for additional metadata is enabled, and – much like in the
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single-argument case discussed above – the specified device has to exist at the time of invocation of the
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command.</para>
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<para>Use the <option>--list</option> command to show a terse table of all local, known block devices with file
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systems that may be mounted with this command.</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>--no-block</option></term>
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<listitem>
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<para>Do not synchronously wait for the requested operation to finish. If this is not specified, the job will
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be verified, enqueued and <command>systemd-mount</command> will wait until the mount or automount unit's
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start-up is completed. By passing this argument, it is only verified and enqueued.</para>
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</listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="no-pager"/>
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<xi:include href="standard-options.xml" xpointer="no-ask-password"/>
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<varlistentry>
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<term><option>--quiet</option></term>
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<term><option>-q</option></term>
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<listitem><para>Suppresses additional informational output while running.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--discover</option></term>
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<listitem><para>Enable probing of the mount source. This switch is implied if a single argument is specified on
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the command line. If passed, additional metadata is read from the device to enhance the unit to create. For
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example, a descriptive string for the transient units is generated from the file system label and device
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model. Moreover if a removable block device (e.g. USB stick) is detected an automount unit instead of a regular
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mount unit is created, with a short idle time-out, in order to ensure the file-system is placed in a clean
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state quickly after each access.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--type=</option></term>
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<term><option>-t</option></term>
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<listitem><para>Specifies the file system type to mount (e.g. <literal>vfat</literal>, <literal>ext4</literal>,
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…). If omitted (or set to <literal>auto</literal>) the file system is determined automatically.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--options=</option></term>
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<term><option>-o</option></term>
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<listitem><para>Additional mount options for the mount point.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--fsck=</option></term>
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<listitem><para>Takes a boolean argument, defaults to on. Controls whether to run a file system check
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immediately before the mount operation. In the automount case (see <option>--automount=</option> below) the
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check will be run the moment the first access to the device is made, which might slightly delay the
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access.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--description=</option></term>
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<listitem><para>Provide a description for the mount or automount unit. See <varname>Description=</varname> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--property=</option></term>
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<term><option>-p</option></term>
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<listitem><para>Sets a unit property for the mount unit that is created. This takes an assignment in the same
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format as <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>set-property</command> command.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--automount=</option></term>
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<listitem><para>Takes a boolean argument. Controls whether to create an automount point or a regular mount
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point. If true an automount point is created that is backed by the actual file system at the time of first
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access. If false a plain mount point is created that is backed by the actual file system immediately. Automount
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points have the benefit that the file system stays unmounted and hence in clean state until it is first
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accessed. In automount mode the <option>--timeout-idle-sec=</option> switch (see below) may be used to ensure
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the mount point is unmounted automatically after the last access and an idle period passed.</para>
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<para>If this switch is not specified it defaults to false. If not specified and <option>--discover</option> is
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used (or only a single argument passed, which implies <option>--discover</option>, see above), and the file
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system block device is detected to be removable, it is set to true, in order to increase the chance that the
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file system is in a fully clean state if the device is unplugged abruptly.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-A</option></term>
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<listitem><para>Equivalent to <option>--automount=yes</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--timeout-idle-sec=</option></term>
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<listitem><para>Takes a time value that controls the idle timeout in automount mode. If set to
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<literal>infinity</literal> (the default) no automatic unmounts are done. Otherwise the file system backing the
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automount point is detached after the last access and the idle timeout passed. See
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry> for details on
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the time syntax supported. This option has no effect if only a regular mount is established, and automounting
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is not used.</para>
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<para>Note that if <option>--discover</option> is used (or only a single argument passed, which implies
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<option>--discover</option>, see above), and the file system block device is detected to be removable,
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<option>--timeout-idle-sec=1s</option> is implied.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--automount-property=</option></term>
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<listitem><para>Similar to <option>--property=</option>, but applies additional properties to the automount
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unit created, instead of the mount unit.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--bind-device=</option></term>
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<listitem><para>Takes a boolean argument, defaults to off. This option only has an effect in automount mode,
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and controls whether the automount unit shall be bound to the backing device's lifetime. If enabled, the
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automount point will be removed automatically when the backing device vanishes. If disabled the automount point
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stays around, and subsequent accesses will block until backing device is replugged. This option has no effect
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in case of non-device mounts, such as network or virtual file system mounts.</para>
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<para>Note that if <option>--discover</option> is used (or only a single argument passed, which implies
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<option>--discover</option>, see above), and the file system block device is detected to be removable, this
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option is implied.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--list</option></term>
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<listitem><para>Instead of establishing a mount or automount point, print a terse list of block devices
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containing file systems that may be mounted with <literal>systemd-mount</literal>, along with useful metadata
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such as labels, etc.</para></listitem>
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</varlistentry>
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<xi:include href="user-system-options.xml" xpointer="user" />
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<xi:include href="user-system-options.xml" xpointer="system" />
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<xi:include href="user-system-options.xml" xpointer="host" />
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<xi:include href="user-system-options.xml" xpointer="machine" />
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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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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>The udev Database</title>
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<para>If <option>--discover</option> is used, <command>systemd-mount</command> honors a couple of additional udev
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properties of block devices:</para>
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<variablelist class='udev-directives'>
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<varlistentry>
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<term><varname>SYSTEMD_MOUNT_OPTIONS=</varname></term>
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<listitem><para>The mount options to use, if <option>--options=</option> is not used.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SYSTEMD_MOUNT_WHERE=</varname></term>
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<listitem><para>The file system path to place the mount point at, instead of the automatically generated
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one.</para></listitem>
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</varlistentry>
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</variablelist>
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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>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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