.\" .\" Copyright (c) 2004 Apple Computer, Inc. All rights reserved. .\" .\" @APPLE_LICENSE_HEADER_START@ .\" .\" This file contains Original Code and/or Modifications of Original Code .\" as defined in and that are subject to the Apple Public Source License .\" Version 2.0 (the 'License'). You may not use this file except in .\" compliance with the License. Please obtain a copy of the License at .\" http://www.opensource.apple.com/apsl/ and read it before using this .\" file. .\" .\" The Original Code and all software distributed under the License are .\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, .\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, .\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. .\" Please see the License for the specific language governing rights and .\" limitations under the License. .\" .\" @APPLE_LICENSE_HEADER_END@ .\" .Dd September 3, 2004 .Dt disklabel 8 .Os .Sh NAME .Nm disklabel .Nd manipulate and query an Apple Label disk label .Sh SYNOPSIS .Nm .Fl create .Ar disk-device .Op Fl msize=size .Op Ar property=value .Op ... .Nm .Fl status .Ar disk-device .Nm .Fl properties .Ar disk-device .Op Ar property[=value] .Op ... .Nm .Fl destroy .Ar disk-device .Sh DESCRIPTION The .Nm utility manipulates ``Apple Label'' partition metadata. ``Apple Label'' partitions allow for a disk device to have a consistent name, ownership, and permissions across reboots, even though .Os uses a dynamic pseudofilesystem for .Pa /dev . .Pp The ``Apple Label'' partition uses a set of metadata (as a plist) in a reserved area of the partition. This metadata describes the owner, name, and so forth. .Pp When .Fl create is used, the .Fl msize argument can specify the size of metadata area; the default is 128Kbytes. The default size unit is bytes, but the following suffixes may be used to multiply by the given factor: ``b'' (512), ``k'' (1024), ``m'' (1048576), and ``g'' (1073741824). .Pp Although any key-value pair can be specified for the properties, certain keys are used by the system: .Bl -tag -width owner-mode .It owner-uid The user (as either a string or numeric value) to own the device. .It owner-gid The group (as either a string or numeric value) associated with the device. .It owner-mode The permissions (as a numeric value) for the device. .It dev-name The name for the device. .El .Pp If the .Ar owner-uid and .Ar owner-gid properties are given as strings, the .Nm utility will attempt to look up the names (as users or groups, as appropriate), and will store the numeric values in the metadata. If it cannot find the names, and the values are not given as numbers, it will print an error, and not store the key/value pairs in the metadata. .Pp The .Ar owner-mode property may be given in decimal, or in octal by using a preceding ``0'' (e.g., ``0666''). .Pp Any property may be forced to be treated as a string by enclosing it in double-quotation marks; bear in mind that shell escapes will probably be necessary in this sitation. .Pp The .Fl properties directive can print out all keys (if no arguments are given), a requested set of keys (if a list of key names is given), or can modify (or add) keys (if a key-value pairs are given). .Pp .Nm also maintains a checksum of the metadata; the .Fl status directive verifies this checksum. .Sh EXAMPLES The following example will create a device with 1MByte of metadata area, owned by fred, with a device name of fred, and be writable by fred: .Pp .Dl "disklabel -create /dev/rdisk1s1 -msize=1M owner-uid=fred dev-name=fred owner-mode=0644" .Pp The following example will then print out the key-value pairs from the above: .Dl "disklabel -properties /dev/rdisk1s1" .Sh SEE ALSO .Xr pdisk 8