SYSTEMD-MOUNT(1) systemd-mount SYSTEMD-MOUNT(1)
NAME
systemd-mount, systemd-umount - Establish and destroy transient mount or
auto-mount points
SYNOPSIS
systemd-mount [OPTIONS...] WHAT [WHERE]
systemd-mount [OPTIONS...] --tmpfs [NAME] WHERE
systemd-mount [OPTIONS...] --list
systemd-mount [OPTIONS...] --umount WHAT|WHERE...
DESCRIPTION
systemd-mount may be used to create and start a transient .mount or
.automount unit of the file system WHAT on the mount point WHERE.
In many ways, systemd-mount is similar to the lower-level mount(8)
command, however instead of executing the mount operation directly and
immediately, systemd-mount 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.
The command takes either one or two arguments. If only one argument is
specified it should refer to a block device or regular file containing a
file system (e.g. "/dev/sdb1" or "/path/to/disk.img"). The block device
or image file is then probed for a file system label and other metadata,
and is mounted to a directory below /run/media/system/ whose name is
generated from the file system label. In this mode the block device or
image file 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 is created instead of a regular
mount point (i.e. the --automount= option is implied, see below). If the
option --tmpfs is specified, then the argument is interpreted as the
path where the new temporary file system shall be mounted.
If two arguments are specified, the first indicates the mount source
(the WHAT) and the second indicates the path to mount it on (the WHERE).
In this mode no probing of the source is attempted, and a backing device
node does not have to exist. However, if this mode is combined with
--discover, 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.
Use the --list command to show a terse table of all local, known block
devices with file systems that may be mounted with this command.
systemd-umount can be used to unmount a mount or automount point. It is
the same as systemd-mount --umount.
OPTIONS
The following options are understood:
--no-block
Do not synchronously wait for the requested operation to finish. If
this is not specified, the job will be verified, enqueued and
systemd-mount will wait until the mount or automount unit's start-up
is completed. By passing this argument, it is only verified and
enqueued.
Added in version 232.
-l, --full
Do not ellipsize the output when --list is specified.
Added in version 245.
--no-pager
Do not pipe output into a pager.
--no-legend
Do not print the legend, i.e. column headers and the footer with
hints.
--no-ask-password
Do not query the user for authentication for privileged operations.
--json=MODE
Shows output formatted as JSON. Expects one of "short" (for the
shortest possible output without any redundant whitespace or line
breaks), "pretty" (for a pretty version of the same, with
indentation and line breaks) or "off" (to turn off JSON output, the
default).
--quiet, -q
Suppresses additional informational output while running.
Added in version 232.
--discover
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
timeout, in order to ensure the file-system is placed in a clean
state quickly after each access.
Added in version 232.
--type=, -t
Specifies the file system type to mount (e.g. "vfat" or "ext4"). If
omitted or set to "auto", the file system type is determined
automatically.
Added in version 232.
--options=, -o
Additional mount options for the mount point.
Added in version 232.
--owner=USER
Let the specified user USER own the mounted file system. This is
done by appending uid= and gid= options to the list of mount
options. Only certain file systems support this option.
Added in version 237.
--fsck=
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 --automount= below) the check will be run the
moment the first access to the device is made, which might slightly
delay the access.
Added in version 232.
--description=
Provide a description for the mount or automount unit. See
Description= in systemd.unit(5).
Added in version 232.
--property=, -p
Sets a unit property for the mount unit that is created. This takes
an assignment in the same format as systemctl(1)'s set-property
command.
Added in version 232.
--automount=
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
--timeout-idle-sec= switch (see below) may be used to ensure the
mount point is unmounted automatically after the last access and an
idle period passed.
If this switch is not specified, it defaults to false. If not
specified and --discover is used (or only a single argument passed,
which implies --discover, 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.
Added in version 232.
-A
Equivalent to --automount=yes.
Added in version 232.
--timeout-idle-sec=
Takes a time value that controls the idle timeout in automount mode.
If set to "infinity" (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
systemd.time(7) for details on the time syntax supported. This
option has no effect if only a regular mount is established, and
automounting is not used.
Note that if --discover is used (or only a single argument passed,
which implies --discover, see above), and the file system block
device is detected to be removable, --timeout-idle-sec=1s is
implied.
Added in version 232.
--automount-property=
Similar to --property=, but applies additional properties to the
automount unit created, instead of the mount unit.
Added in version 232.
--bind-device
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 set, the automount unit will be stopped automatically
when the backing device vanishes. By default, the automount unit
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.
Note that if --discover is used (or only a single argument passed,
which implies --discover, see above), and the file system block
device is detected to be removable, this option is implied.
Added in version 232.
--list
Instead of establishing a mount or automount point, print a terse
list of block devices containing file systems that may be mounted
with "systemd-mount", along with useful metadata such as labels,
etc.
Added in version 232.
-u, --umount
Stop the mount and automount units corresponding to the specified
mount points WHERE or the devices WHAT. systemd-mount with this
option or systemd-umount can take multiple arguments which can be
mount points, devices, /etc/fstab style node names, or backing files
corresponding to loop devices, like systemd-mount --umount
/path/to/umount /dev/sda1 UUID=xxxxxx-xxxx LABEL=xxxxx
/path/to/disk.img. Note that when -H or -M is specified, only
absolute paths to mount points are supported.
Added in version 233.
-G, --collect
Unload the transient unit after it completed, even if it failed.
Normally, without this option, all mount units that mount and failed
are kept in memory until the user explicitly resets their failure
state with systemctl reset-failed or an equivalent command. On the
other hand, units that stopped successfully are unloaded
immediately. If this option is turned on the "garbage collection" of
units is more aggressive, and unloads units regardless if they
exited successfully or failed. This option is a shortcut for
--property=CollectMode=inactive-or-failed, see the explanation for
CollectMode= in systemd.unit(5) for further information.
Added in version 236.
-T, --tmpfs
Create and mount a new tmpfs file system on WHERE, with an optional
NAME that defaults to "tmpfs".
The file system is mounted with the top-level directory mode
determined by the umask(2) setting of the caller, i.e. rwxrwxrwx
masked by the umask of the caller. This matches what mkdir(1) does,
but is different from the kernel default of "rwxrwxrwxt", i.e. a
world-writable directory with the sticky bit set.
Added in version 255.
--user
Talk to the service manager of the calling user, rather than the
service manager of the system.
--system
Talk to the service manager of the system. This is the implied
default.
-H, --host=
Execute the operation remotely. Specify a hostname, or a username
and hostname separated by "@", to connect to. The hostname may
optionally be suffixed by a port ssh is listening on, separated by
":", and then a container name, separated by "/", which connects
directly to a specific container on the specified host. This will
use SSH to talk to the remote machine manager instance. Container
names may be enumerated with machinectl -H HOST. Put IPv6 addresses
in brackets.
-M, --machine=
Execute operation on a local container. Specify a container name to
connect to, optionally prefixed by a user name to connect as and a
separating "@" character. If the special string ".host" is used in
place of the container name, a connection to the local system is
made (which is useful to connect to a specific user's user bus:
"--user --machine=lennart@.host"). If the "@" syntax is not used,
the connection is made as root user. If the "@" syntax is used
either the left hand side or the right hand side may be omitted (but
not both) in which case the local user name and ".host" are implied.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
THE UDEV DATABASE
If --discover is used, systemd-mount honors a couple of additional udev
properties of block devices:
SYSTEMD_MOUNT_OPTIONS=
The mount options to use, if --options= is not used.
Added in version 232.
SYSTEMD_MOUNT_WHERE=
The file system path to place the mount point at, instead of the
automatically generated one.
Added in version 232.
EXAMPLE
Use a udev rule like the following to automatically mount all USB
storage plugged in:
ACTION=="add", SUBSYSTEMS=="usb", SUBSYSTEM=="block", ENV{ID_FS_USAGE}=="filesystem", \
RUN{program}+="/usr/bin/systemd-mount --no-block --automount=yes --collect $devnode"
SEE ALSO
systemd(1), mount(8), systemctl(1), systemd.unit(5), systemd.mount(5),
systemd.automount(5), systemd-run(1)
systemd 257.9 SYSTEMD-MOUNT(1)
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