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NAME
fncreate_fs - create FNS file system contexts
SYNOPSIS
fncreate_fs [ -r ] [ -v ] -f input_file composite_name
fncreate_fs [ -r ] [ -v ] composite_name [ mount_options
] [ mount_location ... ]
DESCRIPTION
The fncreate_fs command creates or updates the FNS file
system context named by composite_name. A description of
the context's bindings is provided in input_file if the
first form of the command is used, or is given on the com-
mand line if the second form is used.
OPTIONS
-r Replace the bindings in the context named by
composite_name with only those specified in the input.
This is equivalent to destroying the context (and,
recursively, its subcontexts), and then running
fncreate_fs without this option. This option should be
used with care.
-v Verbose. Display information about the contexts being
created and modified.
-f input_file
Read input from input_file. If input_file is '-'
(hyphen), read from standard input instead.
OPERANDS
The following operand is supported:
composite_name
An FNS named object.
USAGE
The fncreate_fs command populates the file system portions
of the FNS namespace. The automounter (see automount(1M))
will then "mount" the FNS namespace under /xfn. The direc-
tory with the FNS name org/engineering/fs, for example,
can be found on the file system as /xfn/org/engineering/fs.
The format of the input to fncreate_fs is similar, but not
identical, to the format of indirect automount maps.
Differences are enumerated in the NOTES section below.
Input File Format
The input file supplies the names and values to be bound in
the context of composite_name. Its format is a sequence of
lines of the form:
name [ -options ] [ location ...]
For each such entry, a reference to the location(s) and the
corresponding options is bound to the name
composite_name/name. The name field may be a simple atomic
name, a slash-separated hierarchical name, or '.' (period).
If it is '.' then the reference is bound directly to
composite_name. The name field must not begin with a slash.
The location field specifies the host or hosts that serve
the files for composite_name/name. In the case of a simple
NFS mount, location takes the form:
host:path
where host is the name of the host from which to mount the
file system, and path is the path name of the directory to
mount.
The options field is a comma-separated list of the mount
options to use when mounting the location bound to
composite_name/name. These options also apply to any subcon-
texts of composite_name/name that do not specify their own
mount options.
If options is given but location is not, the options apply
to subcontexts only.
If neither options nor a location is given, then no refer-
ence is bound to composite_name/name. Any existing reference
is unbound.
A single logical line may be continued across multiple input
lines by escaping the newline with a '\' (backslash). Com-
ments begin with a '#' that is either at the beginning of a
line or is prefixed by whitespace, and end at the end of the
line.
Command-line Input
If no input_file is specified on the command line, then the
options and location fields given on the command line are
bound directly to composite_name. This is equivalent to
providing a one-line input file with a '.' in the name
field.
Multiple Locations
Multiple location fields may be specified for NFS file
systems that are exported from multiple, functionally-
equivalent locations. If several locations in the list
share the same path name, they may be combined using a
comma-separated list of host names:
host1,host2,...:path
The hosts may be weighted, with the weighting factor
appended to the host name as a non-negative integer in
parentheses: the lower the number, the more desirable the
server. The default weighting factor is 0 (most desir-
able). In the example:
alpha,bravo,charlie(1),delta(2):/usr/man
hosts alpha and bravo are the most desirable; host delta
is the least desirable.
See the USAGE section of automount(1M) for additional
information on how the automounter interprets the location
field.
Variable Substitution
Variable names, prefixed by '$', may be used with the
options or location fields. For example, a location may be
given as:
svr1:/export/$CPU
The automounter will substitute client-specific values for
these variables when mounting the corresponding file sys-
tems. In the above example, $CPU is replaced by the output
of uname -p; for example, "sparc". See the USAGE section
of automount(1M) for more information on how the auto-
mounter treats variable substitution.
Alternate Input Format
For additional compatibility with automount maps (see
automount(1M)), the following input format is accepted:
name [options] [location ...] \
/offset1 [options1] location1 ... \
/offset2 [options2] location2 ... \
...
where each offset field is a slash-separated hierar-
chy. This is interpreted as being equivalent to:
name [options] [location ...^]
name/offset1 [options1] location1 ...
name/offset2 [options2] location2 ...
...
(the first line being omitted if both options and location
are omitted).
This format is for compatibility only; it provides no addi-
tional functionality. Its use is deprecated.
EXAMPLES
Example 1: Using the fncreate_fs Command
The following examples illustrate the use of the
fncreate_fs command. The call:
example% cat input1
src -ro svr1:/export/src
dist -ro svr2,svr3:/export/dist
example% fncreate_fs -f input1 org/engineering/fs
creates a file system context for the engineering organiza-
tion. It specifies that org/engineering/fs/src is a read-
only NFS mount from server svr1, and that
org/engineering/fs/dist is a read-only NFS mount from
either svr2 or svr3.
Once this is done, there are several equivalent ways to
create the engineering organization's src/cmd context. It
could be done using the composite name org/engineering/fs:
example% cat input2
src/cmd svr1:/export/cmd
example% fncreate_fs -f input2 org/engineering/fs
Equivalently, it could be done using the composite name
org/engineering/fs/src:
example% cat input3
cmd svr1:/export/cmd
example% fncreate_fs -f input3 org/engineering/fs/src
The same results could also be achieved by:
example% fncreate_fs org/engineering/fs/src/cmd svr1:/export/cmd
Note that cmd will also be mounted read-only, since it is a
subcontext of src and does not have mount options of its
own.
In the first example of this section, the -ro mount option
was specified for each entry in the input file. It could
instead have been specified only once:
example% cat input4
. -ro
src svr1:/export/src
dist svr2,svr3:/export/dist
example% fncreate_fs -f input4 org/engineering/fs
The -ro option here applies to all bindings in the context
org/engineering/fs and any of its subcontexts. In particu-
lar, it also applies to the cmd context from the above
examples.
The following will change the NFS server for the src con-
text:
example% fncreate_fs org/engineering/fs/src svr4:/export/src
Had the -r option been used, the cmd subcontext would have
been destroyed as well:
example% fncreate_fs -r org/engineering/fs/src svr4:/export/src
Only the FNS context is destroyed. The /export/cmd direc-
tory on svr1 is not affected.
The file system contexts of users and hosts are not usually
created by fncreate_fs (see the NOTES section below). The
defaults set by fncreate, however, may be overridden. For
example, the call:
example% fncreate_fs user/jane/fs svr1:/export/home/jane
sets Jane's file system to be an NFS mount from svr1.
EXIT STATUS
0 Operation was successful.
1 Operation failed.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWfns |
|_____________________________|_____________________________|
SEE ALSO
fnbind(1), fnlist(1), fnlookup(1), fnunbind(1), nis+(1),
automount(1M), fncreate(1M), fndestroy(1M), attributes(5),
fns(5), fns_files(5), fns_nis(5), fns_nis+(5),
fns_policies(5)
NOTES
The fncreate_fs command affects the FNS file system
namespace only. It does not have any effect on the servers
that export the files and directories from which the
namespace is constructed. Destroying an FNS context does
not remove any files on any server.
FNS policies specify that file system contexts are bound
after the namespace identifier fs in composite names (see
fns_policies(5)). Therefore, composite_name must contain an
fs. The alias _fs may be used in place of fs.
The context named by the components of composite_name
preceding fs must exist prior to the call to fncreate_fs,
since fncreate_fs creates only file system contexts.
Default file system contexts for hosts and users are gen-
erally created by the command fncreate(1M). These defaults
may be overridden using fncreate_fs. Overriding a host's
default file system context is unlikely to make sense.
The input file format is similar to the format of indirect
automount maps (see automount(1M)). The differences are:
o the name field may be hierarchical, and may be '.'
o there are no included maps or special maps
o there may be entries with neither options nor loca-
tions
o the characters '*' and '&' have no special meaning
The process executing the fncreate_fs command may need cer-
tain credentials to update information in the underlying
naming service. See fns_nis(5), fns_nis+(5), and
fns_files(5) for more information.
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