MNT(C) XENIX System V MNT(C)
Name
mnt - mount a filesystem
Syntax
/etc/mnt [ -urat ] [ directory ]
/etc/umnt directory
Description
mnt allows users other than the super-user to access the
functionality of the mount(ADM) command to mount selected
filesystems. The super-user can define how and when a
filesystem mount is permitted via special entries in the
/etc/default/filesys file.
The filesystem requirements are the same as defined for
mount(ADM).
umnt removes the removable filesystem previously mounted at
the mount point directory .
mnt is invoked from /etc/rc with the -r and possibly the -a
flag to mount filesystems when the system comes up multi-
user. The -a flag is used when the system has autobooted.
Neither of these flags should be specified during normal
use.
The -t flag displays the contents of /etc/default/filesys.
The -u flag forces mnt to behave like umnt.
Options
The following options can be defined in the
/etc/default/filesys entry for a filesystem:
bdev=/dev/device Name of block device associated with the
filesystem.
cdev=/dev/device Name of character (raw) device
associated with the filesystem.
mountdir=/directory The directory the filesystem is to be
mounted on.
desc=name A string describing the filesystem.
passwd=string An optional password prompted for at
mount request time. Cannot be a simple
string; must be in the format of
/etc/passwd. (See Notes.)
fsck=yes, no, dirty, prompt
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If ``yes'' or ``no,'' tells explicitly
whether or not to run fsck. If
``dirty,'' fsck is run only if the
filesystem requires cleaning. If
``prompt,'' the user is prompted for a
choice. If no entry is given, the
default value is ``dirty.''
fsckflags=flags Any flags to be passed to fsck.
rcfsck=yes, no, dirty, prompt
Similar to fsck entry, but only applies
when the -r flag is passed.
maxcleans=n The number of times to repeat cleaning
of a dirty filesystem before giving up.
If undefined, default is 4.
mount=yes, no, prompt
If ``yes'' or ``no,'' users are allowed
or disallowed to mount the filesystem,
respectively. If ``prompt,'' the user
is queried to mount the filesystem.
rcmount=yes, no, prompt
If ``yes,'' the filesystem is mounted by
/etc/rc when the system comes up
multiuser. If ``no,'' the filesystem is
never mounted by /etc/rc. With
``prompt,'' a query is displayed at boot
time to mount the filesystem.
mountflags=flags Any flags to be passed to mount.
prep=yes, no, prompt
Indicates whether any prepcmd entry
should always be executed, never
executed, or executed as specified by
the user.
prepcmd=command An arbitrary shell command to be invoked
immediately following password check and
prior to running fsck.
init=yes, no, prompt
Indicates whether an initcmd entry
should always be executed, never be
executed, or executed as specified by
user.
initcmd=command An optional, arbitrary shell command to
be invoked immediately following a
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successful mount.
Any entries containing spaces, tabs, or newlines must be
contained in double quotes (").
The only mandatory entries in /etc/default/filesys are bdev
and mountdir. The prepcmd and initcmd options can be used
to execute another command before or after mounting the
filesystem. For example, initcmd could be defined to send
mail to root whenever a given filesystem is mounted.
When invoked without arguments, mnt attempts to mount all
filesystems that have the entries mount=yes or mount=prompt.
Examples
The following is a sample /etc/default/filesys file:
bdev=/dev/root cdev=/dev/rroot mountdir=/ \
desc="The Root Filesystem" rcmount=no mount=no
bdev=/dev/u cdev=/dev/ru mountdir=/u rcmount=yes \
fsckflags=-y desc="The User Filesystem"
bdev=/dev/x cdev=/dev/rx mountdir=/u rcmount=no \
mount=yes fsckflags=-y desc="The Extra Filesystem"
Of the examples above, only /x is mountable by the user.
Files
/etc/default/filesys
Filesystem data
See Also
mount(ADM), default(M)
Diagnostics
mnt will fail if the filesystem to be mounted is currently
mounted under another name.
Busy filesystems cannot be dismounted with umnt. A
filesystem is busy if it contains an open file or if a
user's present working directory resides within the
filesystem.
Notes
Some degree of validation is done on the filesystem, however
it is generally unwise to mount corrupt filesystems.
In order to create a password for a filesystem, you must
create a dummy account in /etc/passwd and define a password
for it. You can then edit the /etc/passwd file and transfer
the encrypted password into the password entry for the
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filesystem in /etc/default/filesys.
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