path: root/src/systemd-mount/systemd-mount.xml

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<refentry id="systemd-mount"
          xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>systemd-mount</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Lennart</firstname>
        <surname>Poettering</surname>
        <email>lennart@poettering.net</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-mount</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-mount</refname>
    <refpurpose>Establish a mount or auto-mount point transiently</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>systemd-mount</command>
      <arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
      <arg choice="plain"><replaceable>WHAT</replaceable></arg>
      <arg choice="opt"><replaceable>WHERE</replaceable></arg>
    </cmdsynopsis>
    <cmdsynopsis>
      <command>systemd-mount</command>
      <arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
      <arg choice="plain"><option>--list</option></arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><command>systemd-mount</command> may be used to create and start a transient <filename>.mount</filename> or
    <filename>.automount</filename> unit of the file system <replaceable>WHAT</replaceable> on the mount point
    <replaceable>WHERE</replaceable>.</para>

    <para>In many ways, <command>systemd-mount</command> is similar to the lower-level
    <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> command, however instead
    of executing the mount operation directly and immediately, <command>systemd-mount</command> schedules it through
    the service manager job queue, so that it may pull in further dependencies (such as parent mounts, or a file system
    checker to execute a priori), and may make use of the auto-mounting logic.</para>

    <para>The command takes either one or two arguments. If only one argument is specified it should refer to a block
    device containing a file system (e.g. <literal>/dev/sdb1</literal>), which is then probed for a label and other
    metadata, and is mounted to a directory whose name is generated from the label. In this mode the block device must
    exist at the time of invocation of the command, so that it may be probed. If the device is found to be a removable
    block device (e.g. a USB stick) an automount point instead of a regular mount point is created (i.e. the
    <option>--automount=</option> option is implied, see below).</para>

    <para>If two arguments are specified the first indicates the mount source (the <replaceable>WHAT</replaceable>) and
    the second indicates the path to mount it on (the <replaceable>WHERE</replaceable>). In this mode no probing of the
    source is attempted, and a backing device node doesn't have to exist yet. However, if this mode is combined with
    <option>--discover</option>, device node probing for additional metadata is enabled, and – much like in the
    single-argument case discussed above – the specified device has to exist at the time of invocation of the
    command.</para>

    <para>Use the <option>--list</option> command to show a terse table of all local, known block devices with file
    systems that may be mounted with this command.</para>
  </refsect1>

  <refsect1>
    <title>Options</title>

    <para>The following options are understood:</para>

    <variablelist>

      <varlistentry>
        <term><option>--no-block</option></term>

        <listitem>
          <para>Do not synchronously wait for the requested operation to finish. If this is not specified, the job will
          be verified, enqueued and <command>systemd-mount</command> will wait until the mount or automount unit's
          start-up is completed. By passing this argument, it is only verified and enqueued.</para>
        </listitem>
      </varlistentry>

      <xi:include href="standard-options.xml" xpointer="no-pager"/>
      <xi:include href="standard-options.xml" xpointer="no-ask-password"/>

      <varlistentry>
        <term><option>--quiet</option></term>
        <term><option>-q</option></term>

        <listitem><para>Suppresses additional informational output while running.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--discover</option></term>

        <listitem><para>Enable probing of the mount source. This switch is implied if a single argument is specified on
        the command line. If passed, additional metadata is read from the device to enhance the unit to create. For
        example, a descriptive string for the transient units is generated from the file system label and device
        model. Moreover if a removable block device (e.g. USB stick) is detected an automount unit instead of a regular
        mount unit is created, with a short idle time-out, in order to ensure the file-system is placed in a clean
        state quickly after each access.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--type=</option></term>
        <term><option>-t</option></term>

        <listitem><para>Specifies the file system type to mount (e.g. <literal>vfat</literal>, <literal>ext4</literal>,
        …). If omitted (or set to <literal>auto</literal>) the file system is determined automatically.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--options=</option></term>
        <term><option>-o</option></term>

        <listitem><para>Additional mount options for the mount point.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--fsck=</option></term>

        <listitem><para>Takes a boolean argument, defaults to on. Controls whether to run a file system check
        immediately before the mount operation. In the automount case (see <option>--automount=</option> below) the
        check will be run the moment the first access to the device is made, which might slightly delay the
        access.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--description=</option></term>

        <listitem><para>Provide a description for the mount or automount unit. See <varname>Description=</varname> in
        <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--property=</option></term>
        <term><option>-p</option></term>

        <listitem><para>Sets a unit property for the mount unit that is created. This takes an assignment in the same
        format as <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
        <command>set-property</command> command.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--automount=</option></term>

        <listitem><para>Takes a boolean argument. Controls whether to create an automount point or a regular mount
        point. If true an automount point is created that is backed by the actual file system at the time of first
        access. If false a plain mount point is created that is backed by the actual file system immediately. Automount
        points have the benefit that the file system stays unmounted and hence in clean state until it is first
        accessed. In automount mode the <option>--timeout-idle-sec=</option> switch (see below) may be used to ensure
        the mount point is unmounted automatically after the last access and an idle period passed.</para>

        <para>If this switch is not specified it defaults to false. If not specified and <option>--discover</option> is
        used (or only a single argument passed, which implies <option>--discover</option>, see above), and the file
        system block device is detected to be removable, it is set to true, in order to increase the chance that the
        file system is in a fully clean state if the device is unplugged abruptly.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-A</option></term>

        <listitem><para>Equivalent to <option>--automount=yes</option>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--timeout-idle-sec=</option></term>

        <listitem><para>Takes a time value that controls the idle timeout in automount mode. If set to
        <literal>infinity</literal> (the default) no automatic unmounts are done. Otherwise the file system backing the
        automount point is detached after the last access and the idle timeout passed. See
        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry> for details on
        the time syntax supported. This option has no effect if only a regular mount is established, and automounting
        is not used.</para>

        <para>Note that if <option>--discover</option> is used (or only a single argument passed, which implies
        <option>--discover</option>, see above), and the file system block device is detected to be removable,
        <option>--timeout-idle-sec=1s</option> is implied.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--automount-property=</option></term>

        <listitem><para>Similar to <option>--property=</option>, but applies additional properties to the automount
        unit created, instead of the mount unit.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--bind-device=</option></term>

        <listitem><para>Takes a boolean argument, defaults to off. This option only has an effect in automount mode,
        and controls whether the automount unit shall be bound to the backing device's lifetime. If enabled, the
        automount point will be removed automatically when the backing device vanishes. If disabled the automount point
        stays around, and subsequent accesses will block until backing device is replugged. This option has no effect
        in case of non-device mounts, such as network or virtual file system mounts.</para>

        <para>Note that if <option>--discover</option> is used (or only a single argument passed, which implies
        <option>--discover</option>, see above), and the file system block device is detected to be removable, this
        option is implied.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--list</option></term>

        <listitem><para>Instead of establishing a mount or automount point, print a terse list of block devices
        containing file systems that may be mounted with <literal>systemd-mount</literal>, along with useful metadata
        such as labels, etc.</para></listitem>
      </varlistentry>

      <xi:include href="user-system-options.xml" xpointer="user" />
      <xi:include href="user-system-options.xml" xpointer="system" />
      <xi:include href="user-system-options.xml" xpointer="host" />
      <xi:include href="user-system-options.xml" xpointer="machine" />

      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </variablelist>

  </refsect1>

  <refsect1>
    <title>Exit status</title>

    <para>On success, 0 is returned, a non-zero failure
    code otherwise.</para>
  </refsect1>

  <refsect1>
    <title>The udev Database</title>

    <para>If <option>--discover</option> is used, <command>systemd-mount</command> honors a couple of additional udev
    properties of block devices:</para>

    <variablelist class='udev-directives'>
      <varlistentry>
        <term><varname>SYSTEMD_MOUNT_OPTIONS=</varname></term>

        <listitem><para>The mount options to use, if <option>--options=</option> is not used.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>SYSTEMD_MOUNT_WHERE=</varname></term>

        <listitem><para>The file system path to place the mount point at, instead of the automatically generated
        one.</para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>