blob: e5c053fcf3266e2157a0cd646362e7b763ef5d59 [file] [log] [blame]
Eric Andersenc9f20d92002-12-05 08:41:41 +00001#
2# For a description of the syntax of this configuration file,
3# see scripts/kbuild/config-language.txt.
4#
5
6menu "Linux System Utilities"
7
Denis Vlasenkod16950d2008-11-29 09:05:50 +00008config ACPID
9 bool "acpid"
10 default n
11 help
12 acpid listens to ACPI events coming either in textual form from
13 /proc/acpi/event (though it is marked deprecated it is still widely
14 used and _is_ a standard) or in binary form from specified evdevs
15 (just use /dev/input/event*).
16
17 It parses the event to retrieve ACTION and a possible PARAMETER.
18 It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
19 (if the resulting path is a directory) or directly as an executable.
20
21 N.B. acpid relies on run-parts so have the latter installed.
22
23config FEATURE_ACPID_COMPAT
24 bool "Accept and ignore redundant options"
25 default n
26 depends on ACPID
27 help
28 Accept and ignore compatibility options -g -m -s -S -v.
29
Denis Vlasenko1e19afd2008-10-12 11:20:08 +000030config BLKID
31 bool "blkid"
32 default n
33 select VOLUMEID
34 help
35 Lists labels and UUIDs of all filesystems.
36 WARNING:
37 With all submodules selected, it will add ~8k to busybox.
38
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000039config DMESG
Eric Andersenc9f20d92002-12-05 08:41:41 +000040 bool "dmesg"
41 default n
42 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000043 dmesg is used to examine or control the kernel ring buffer. When the
Eric Andersena0ac4522003-02-27 03:14:04 +000044 Linux kernel prints messages to the system log, they are stored in
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000045 the kernel ring buffer. You can use dmesg to print the kernel's ring
Eric Andersena0ac4522003-02-27 03:14:04 +000046 buffer, clear the kernel ring buffer, change the size of the kernel
47 ring buffer, and change the priority level at which kernel messages
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000048 are also logged to the system console. Enable this option if you
Eric Andersena0ac4522003-02-27 03:14:04 +000049 wish to enable the 'dmesg' utility.
Eric Andersenc9f20d92002-12-05 08:41:41 +000050
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000051config FEATURE_DMESG_PRETTY
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +000052 bool "Pretty dmesg output"
Rob Landley446129a2006-07-27 16:40:55 +000053 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000054 depends on DMESG
Rob Landley446129a2006-07-27 16:40:55 +000055 help
56 If you wish to scrub the syslog level from the output, say 'Y' here.
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000057 The syslog level is a string prefixed to every line with the form
58 "<#>".
Rob Landley446129a2006-07-27 16:40:55 +000059
60 With this option you will see:
61 # dmesg
62 Linux version 2.6.17.4 .....
63 BIOS-provided physical RAM map:
64 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
65
66 Without this option you will see:
67 # dmesg
68 <5>Linux version 2.6.17.4 .....
69 <6>BIOS-provided physical RAM map:
70 <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
71
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000072config FBSET
Eric Andersenc9f20d92002-12-05 08:41:41 +000073 bool "fbset"
74 default n
75 help
Eric Andersena0ac4522003-02-27 03:14:04 +000076 fbset is used to show or change the settings of a Linux frame buffer
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000077 device. The frame buffer device provides a simple and unique
78 interface to access a graphics display. Enable this option
Eric Andersen88c916b2003-10-22 09:58:56 +000079 if you wish to enable the 'fbset' utility.
Eric Andersena0ac4522003-02-27 03:14:04 +000080
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000081config FEATURE_FBSET_FANCY
Rob Landley2ec922e2006-04-13 23:22:16 +000082 bool "Turn on extra fbset options"
Eric Andersenc9f20d92002-12-05 08:41:41 +000083 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000084 depends on FBSET
Eric Andersenc9f20d92002-12-05 08:41:41 +000085 help
Eric Andersena0ac4522003-02-27 03:14:04 +000086 This option enables extended fbset options, allowing one to set the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +000087 framebuffer size, color depth, etc. interface to access a graphics
88 display. Enable this option if you wish to enable extended fbset
Eric Andersena0ac4522003-02-27 03:14:04 +000089 options.
Eric Andersenc9f20d92002-12-05 08:41:41 +000090
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000091config FEATURE_FBSET_READMODE
Rob Landley2ec922e2006-04-13 23:22:16 +000092 bool "Turn on fbset readmode support"
Eric Andersenc9f20d92002-12-05 08:41:41 +000093 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000094 depends on FBSET
Eric Andersenc9f20d92002-12-05 08:41:41 +000095 help
Eric Andersena0ac4522003-02-27 03:14:04 +000096 This option allows fbset to read the video mode database stored by
97 default as /etc/fb.modes, which can be used to set frame buffer
98 device to pre-defined video modes.
Eric Andersenc9f20d92002-12-05 08:41:41 +000099
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000100config FDFLUSH
Eric Andersenc9f20d92002-12-05 08:41:41 +0000101 bool "fdflush"
102 default n
103 help
Eric Andersen88c916b2003-10-22 09:58:56 +0000104 fdflush is only needed when changing media on slightly-broken
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000105 removable media drives. It is used to make Linux believe that a
Eric Andersena0ac4522003-02-27 03:14:04 +0000106 hardware disk-change switch has been actuated, which causes Linux to
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000107 forget anything it has cached from the previous media. If you have
Eric Andersena0ac4522003-02-27 03:14:04 +0000108 such a slightly-broken drive, you will need to run fdflush every time
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000109 you change a disk. Most people have working hardware and can safely
Eric Andersen88c916b2003-10-22 09:58:56 +0000110 leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000111
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000112config FDFORMAT
Eric Andersen01c3d402003-07-05 07:51:31 +0000113 bool "fdformat"
114 default n
115 help
Eric Andersen88c916b2003-10-22 09:58:56 +0000116 fdformat is used to low-level format a floppy disk.
Eric Andersen01c3d402003-07-05 07:51:31 +0000117
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000118config FDISK
Eric Andersenc9f20d92002-12-05 08:41:41 +0000119 bool "fdisk"
120 default n
121 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000122 The fdisk utility is used to divide hard disks into one or more
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000123 logical disks, which are generally called partitions. This utility
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000124 can be used to list and edit the set of partitions or BSD style
Eric Andersena0ac4522003-02-27 03:14:04 +0000125 'disk slices' that are defined on a hard drive.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000126
Eric Andersen84bdea82004-05-19 10:49:17 +0000127config FDISK_SUPPORT_LARGE_DISKS
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000128 bool "Support over 4GB disks"
Eric Andersen84bdea82004-05-19 10:49:17 +0000129 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000130 depends on FDISK
Eric Andersen84bdea82004-05-19 10:49:17 +0000131 help
132 Enable this option to support large disks > 4GB.
133
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000134config FEATURE_FDISK_WRITABLE
Rob Landley2ec922e2006-04-13 23:22:16 +0000135 bool "Write support"
Glenn L McGrath4dcc2dd2003-01-04 11:56:06 +0000136 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000137 depends on FDISK
Glenn L McGrath4dcc2dd2003-01-04 11:56:06 +0000138 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000139 Enabling this option allows you to create or change a partition table
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000140 and write those changes out to disk. If you leave this option
Eric Andersena0ac4522003-02-27 03:14:04 +0000141 disabled, you will only be able to view the partition table.
Glenn L McGrath4dcc2dd2003-01-04 11:56:06 +0000142
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000143config FEATURE_AIX_LABEL
Rob Landley2ec922e2006-04-13 23:22:16 +0000144 bool "Support AIX disklabels"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000145 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000146 depends on FDISK && FEATURE_FDISK_WRITABLE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000147 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000148 Enabling this option allows you to create or change AIX disklabels.
149 Most people can safely leave this option disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000150
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000151config FEATURE_SGI_LABEL
Rob Landley2ec922e2006-04-13 23:22:16 +0000152 bool "Support SGI disklabels"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000153 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000154 depends on FDISK && FEATURE_FDISK_WRITABLE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000155 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000156 Enabling this option allows you to create or change SGI disklabels.
157 Most people can safely leave this option disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000158
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000159config FEATURE_SUN_LABEL
Rob Landley2ec922e2006-04-13 23:22:16 +0000160 bool "Support SUN disklabels"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000161 default n
Mike Frysinger71a6a4e2007-01-24 08:24:43 +0000162 depends on FDISK && FEATURE_FDISK_WRITABLE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000163 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000164 Enabling this option allows you to create or change SUN disklabels.
165 Most people can safely leave this option disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000166
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000167config FEATURE_OSF_LABEL
Rob Landley2ec922e2006-04-13 23:22:16 +0000168 bool "Support BSD disklabels"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000169 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000170 depends on FDISK && FEATURE_FDISK_WRITABLE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000171 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000172 Enabling this option allows you to create or change BSD disklabels
173 and define and edit BSD disk slices.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000174
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000175config FEATURE_FDISK_ADVANCED
Rob Landley2ec922e2006-04-13 23:22:16 +0000176 bool "Support expert mode"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000177 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000178 depends on FDISK && FEATURE_FDISK_WRITABLE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000179 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000180 Enabling this option allows you to do terribly unsafe things like
181 define arbitrary drive geometry, move the beginning of data in a
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000182 partition, and similarly evil things. Unless you have a very good
Eric Andersena0ac4522003-02-27 03:14:04 +0000183 reason you would be wise to leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000184
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000185config FINDFS
186 bool "findfs"
187 default n
188 select VOLUMEID
189 help
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000190 Prints the name of a filesystem with given label or UUID.
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000191 WARNING:
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000192 With all submodules selected, it will add ~8k to busybox.
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000193
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000194config FREERAMDISK
Eric Andersenc9f20d92002-12-05 08:41:41 +0000195 bool "freeramdisk"
196 default n
197 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000198 Linux allows you to create ramdisks. This utility allows you to
Eric Andersena0ac4522003-02-27 03:14:04 +0000199 delete them and completely free all memory that was used for the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000200 ramdisk. For example, if you boot Linux into a ramdisk and later
Eric Andersena0ac4522003-02-27 03:14:04 +0000201 pivot_root, you may want to free the memory that is allocated to the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000202 ramdisk. If you have no use for freeing memory from a ramdisk, leave
Eric Andersena0ac4522003-02-27 03:14:04 +0000203 this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000204
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000205config FSCK_MINIX
Eric Andersenc9f20d92002-12-05 08:41:41 +0000206 bool "fsck_minix"
207 default n
208 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000209 The minix filesystem is a nice, small, compact, read-write filesystem
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000210 with little overhead. It is not a journaling filesystem however and
Eric Andersen88c916b2003-10-22 09:58:56 +0000211 can experience corruption if it is not properly unmounted or if the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000212 power goes off in the middle of a write. This utility allows you to
Eric Andersena0ac4522003-02-27 03:14:04 +0000213 check for and attempt to repair any corruption that occurs to a minix
214 filesystem.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000215
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000216config MKFS_MINIX
Eric Andersenc9f20d92002-12-05 08:41:41 +0000217 bool "mkfs_minix"
218 default n
219 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000220 The minix filesystem is a nice, small, compact, read-write filesystem
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000221 with little overhead. If you wish to be able to create minix
222 filesystems this utility will do the job for you.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000223
224comment "Minix filesystem support"
Mike Frysinger71a6a4e2007-01-24 08:24:43 +0000225 depends on FSCK_MINIX || MKFS_MINIX
Eric Andersenc9f20d92002-12-05 08:41:41 +0000226
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000227config FEATURE_MINIX2
Rob Landley2ec922e2006-04-13 23:22:16 +0000228 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000229 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000230 depends on FSCK_MINIX || MKFS_MINIX
Eric Andersenc9f20d92002-12-05 08:41:41 +0000231 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000232 If you wish to be able to create version 2 minix filesystems, enable
233 this. If you enabled 'mkfs_minix' then you almost certainly want to
234 be using the version 2 filesystem support.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000235
Denis Vlasenko9d04b6b2009-03-28 02:13:01 +0000236config MKFS_VFAT
237 bool "mkfs_vfat"
238 default n
239 help
240 Utility to create FAT32 filesystems.
241
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000242config GETOPT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000243 bool "getopt"
244 default n
245 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000246 The getopt utility is used to break up (parse) options in command
247 lines to make it easy to write complex shell scripts that also check
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000248 for legal (and illegal) options. If you want to write horribly
Eric Andersena0ac4522003-02-27 03:14:04 +0000249 complex shell scripts, or use some horribly complex shell script
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000250 written by others, this utility may be for you. Most people will
Eric Andersena0ac4522003-02-27 03:14:04 +0000251 wisely leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000252
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000253config HEXDUMP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000254 bool "hexdump"
255 default n
256 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000257 The hexdump utility is used to display binary data in a readable
258 way that is comparable to the output from most hex editors.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000259
Denis Vlasenkofbe5f392007-11-18 05:36:50 +0000260config FEATURE_HEXDUMP_REVERSE
261 bool "Support -R, reverse of 'hexdump -Cv'"
262 default n
263 depends on HEXDUMP
264 help
265 The hexdump utility is used to display binary data in an ascii
266 readable way. This option creates binary data from an ascii input.
267 NB: this option is non-standard. It's unwise to use it in scripts
268 aimed to be portable.
269
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000270config HD
271 bool "hd"
272 default n
273 select HEXDUMP
274 help
275 hd is an alias to hexdump -C.
276
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000277config HWCLOCK
Eric Andersenc9f20d92002-12-05 08:41:41 +0000278 bool "hwclock"
279 default n
280 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000281 The hwclock utility is used to read and set the hardware clock
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000282 on a system. This is primarily used to set the current time on
Eric Andersen88c916b2003-10-22 09:58:56 +0000283 shutdown in the hardware clock, so the hardware will keep the
284 correct time when Linux is _not_ running.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000285
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000286config FEATURE_HWCLOCK_LONG_OPTIONS
Rob Landley2ec922e2006-04-13 23:22:16 +0000287 bool "Support long options (--hctosys,...)"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000288 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000289 depends on HWCLOCK && GETOPT_LONG
Eric Andersenc9f20d92002-12-05 08:41:41 +0000290 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000291 By default, the hwclock utility only uses short options. If you
Eric Andersen88c916b2003-10-22 09:58:56 +0000292 are overly fond of its long options, such as --hctosys, --utc, etc)
Eric Andersena0ac4522003-02-27 03:14:04 +0000293 then enable this option.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000294
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000295config FEATURE_HWCLOCK_ADJTIME_FHS
Rob Landley2ec922e2006-04-13 23:22:16 +0000296 bool "Use FHS /var/lib/hwclock/adjtime"
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000297 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000298 depends on HWCLOCK
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000299 help
300 Starting with FHS 2.3, the adjtime state file is supposed to exist
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000301 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000302 to use the FHS behavior, answer Y here, otherwise answer N for the
303 classic /etc/adjtime path.
304
Bernhard Reutner-Fischere99a92d2008-07-22 18:32:06 +0000305 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000306
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000307config IPCRM
Rob Landley6eb1e412005-06-20 04:30:36 +0000308 bool "ipcrm"
309 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000310 select FEATURE_SUID
Rob Landley6eb1e412005-06-20 04:30:36 +0000311 help
312 The ipcrm utility allows the removal of System V interprocess
313 communication (IPC) objects and the associated data structures
314 from the system.
315
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000316config IPCS
Rob Landley6eb1e412005-06-20 04:30:36 +0000317 bool "ipcs"
318 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000319 select FEATURE_SUID
Rob Landley6eb1e412005-06-20 04:30:36 +0000320 help
321 The ipcs utility is used to provide information on the currently
322 allocated System V interprocess (IPC) objects in the system.
323
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000324config LOSETUP
Mike Frysinger75aa1922005-09-24 23:12:38 +0000325 bool "losetup"
326 default n
327 help
328 losetup is used to associate or detach a loop device with a regular
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000329 file or block device, and to query the status of a loop device. This
Mike Frysinger75aa1922005-09-24 23:12:38 +0000330 version does not currently support enabling data encryption.
331
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000332config MDEV
Rob Landley70f7ef72005-12-13 08:21:33 +0000333 bool "mdev"
334 default n
335 help
Mike Frysingerae302102007-02-14 13:20:29 +0000336 mdev is a mini-udev implementation for dynamically creating device
337 nodes in the /dev directory.
338
339 For more information, please see docs/mdev.txt
Rob Landley70f7ef72005-12-13 08:21:33 +0000340
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000341config FEATURE_MDEV_CONF
Rob Landley2ec922e2006-04-13 23:22:16 +0000342 bool "Support /etc/mdev.conf"
Rob Landley70f7ef72005-12-13 08:21:33 +0000343 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000344 depends on MDEV
Rob Landley70f7ef72005-12-13 08:21:33 +0000345 help
Mike Frysingerae302102007-02-14 13:20:29 +0000346 Add support for the mdev config file to control ownership and
347 permissions of the device nodes.
Rob Landley70f7ef72005-12-13 08:21:33 +0000348
Mike Frysingerae302102007-02-14 13:20:29 +0000349 For more information, please see docs/mdev.txt
Rob Landley70f7ef72005-12-13 08:21:33 +0000350
Mike Frysingerf0044c42008-02-01 06:53:50 +0000351config FEATURE_MDEV_RENAME
352 bool "Support subdirs/symlinks"
353 default n
354 depends on FEATURE_MDEV_CONF
355 help
356 Add support for renaming devices and creating symlinks.
357
358 For more information, please see docs/mdev.txt
359
Denis Vlasenkof2f38682008-03-29 17:26:10 +0000360config FEATURE_MDEV_RENAME_REGEXP
361 bool "Support regular expressions substitutions when renaming device"
362 default n
363 depends on FEATURE_MDEV_RENAME
364 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000365 Add support for regular expressions substitutions when renaming
366 device.
Denis Vlasenkof2f38682008-03-29 17:26:10 +0000367
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000368config FEATURE_MDEV_EXEC
Rob Landleyef10d522006-06-26 14:11:33 +0000369 bool "Support command execution at device addition/removal"
370 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000371 depends on FEATURE_MDEV_CONF
Rob Landleyef10d522006-06-26 14:11:33 +0000372 help
Mike Frysingerae302102007-02-14 13:20:29 +0000373 This adds support for an optional field to /etc/mdev.conf for
374 executing commands when devices are created/removed.
Rob Landleyef10d522006-06-26 14:11:33 +0000375
Mike Frysingerae302102007-02-14 13:20:29 +0000376 For more information, please see docs/mdev.txt
Rob Landleyef10d522006-06-26 14:11:33 +0000377
Mike Frysingera78ef2c2007-06-13 07:34:15 +0000378config FEATURE_MDEV_LOAD_FIRMWARE
379 bool "Support loading of firmwares"
380 default n
381 depends on MDEV
382 help
383 Some devices need to load firmware before they can be usable.
384
385 These devices will request userspace look up the files in
386 /lib/firmware/ and if it exists, send it to the kernel for
387 loading into the hardware.
388
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000389config MKSWAP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000390 bool "mkswap"
391 default n
392 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000393 The mkswap utility is used to configure a file or disk partition as
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000394 Linux swap space. This allows Linux to use the entire file or
Eric Andersena0ac4522003-02-27 03:14:04 +0000395 partition as if it were additional RAM, which can greatly increase
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000396 the capability of low-memory machines. This additional memory is
Eric Andersena0ac4522003-02-27 03:14:04 +0000397 much slower than real RAM, but can be very helpful at preventing your
Eric Andersen88c916b2003-10-22 09:58:56 +0000398 applications being killed by the Linux out of memory (OOM) killer.
399 Once you have created swap space using 'mkswap' you need to enable
400 the swap space using the 'swapon' utility.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000401
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000402config FEATURE_MKSWAP_V0
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000403 bool "Version 0 support"
Bernhard Reutner-Fischer56dd0bf2006-03-29 17:32:24 +0000404 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000405 depends on MKSWAP
406# depends on MKSWAP && DEPRECATED
Bernhard Reutner-Fischer56dd0bf2006-03-29 17:32:24 +0000407 help
408 Enable support for the old v0 style.
409 If your kernel is older than 2.1.117, then v0 support is the
410 only option.
411
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000412config MORE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000413 bool "more"
414 default n
415 help
Eric Andersen88c916b2003-10-22 09:58:56 +0000416 more is a simple utility which allows you to read text one screen
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000417 sized page at a time. If you want to read text that is larger than
Eric Andersena0ac4522003-02-27 03:14:04 +0000418 the screen, and you are using anything faster than a 300 baud modem,
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000419 you will probably find this utility very helpful. If you don't have
Eric Andersena0ac4522003-02-27 03:14:04 +0000420 any need to reading text files, you can leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000421
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000422config FEATURE_USE_TERMIOS
Rob Landley2ec922e2006-04-13 23:22:16 +0000423 bool "Use termios to manipulate the screen"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000424 default y
Paul Fox9e1f92d2008-03-20 16:04:36 +0000425 depends on MORE || TOP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000426 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000427 This option allows utilities such as 'more' and 'top' to determine
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000428 the size of the screen. If you leave this disabled, your utilities
Eric Andersen88c916b2003-10-22 09:58:56 +0000429 that display things on the screen will be especially primitive and
Eric Andersena0ac4522003-02-27 03:14:04 +0000430 will be unable to determine the current screen size, and will be
431 unable to move the cursor.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000432
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000433config VOLUMEID
Denis Vlasenko35a064b2008-11-06 00:49:59 +0000434 bool #No description makes it a hidden option
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000435 default n
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000436
437config FEATURE_VOLUMEID_EXT
438 bool "Ext filesystem"
439 default n
440 depends on VOLUMEID
441 help
442 TODO
443
444config FEATURE_VOLUMEID_REISERFS
445 bool "Reiser filesystem"
446 default n
447 depends on VOLUMEID
448 help
449 TODO
450
451config FEATURE_VOLUMEID_FAT
452 bool "fat filesystem"
453 default n
454 depends on VOLUMEID
455 help
456 TODO
457
458config FEATURE_VOLUMEID_HFS
459 bool "hfs filesystem"
460 default n
461 depends on VOLUMEID
462 help
463 TODO
464
465config FEATURE_VOLUMEID_JFS
466 bool "jfs filesystem"
467 default n
468 depends on VOLUMEID
469 help
470 TODO
471
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000472### config FEATURE_VOLUMEID_UFS
473### bool "ufs filesystem"
474### default n
475### depends on VOLUMEID
476### help
477### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000478
479config FEATURE_VOLUMEID_XFS
480 bool "xfs filesystem"
481 default n
482 depends on VOLUMEID
483 help
484 TODO
485
486config FEATURE_VOLUMEID_NTFS
487 bool "ntfs filesystem"
488 default n
489 depends on VOLUMEID
490 help
491 TODO
492
493config FEATURE_VOLUMEID_ISO9660
494 bool "iso9660 filesystem"
495 default n
496 depends on VOLUMEID
497 help
498 TODO
499
500config FEATURE_VOLUMEID_UDF
501 bool "udf filesystem"
502 default n
503 depends on VOLUMEID
504 help
505 TODO
506
507config FEATURE_VOLUMEID_LUKS
508 bool "luks filesystem"
509 default n
510 depends on VOLUMEID
511 help
512 TODO
513
514config FEATURE_VOLUMEID_LINUXSWAP
515 bool "linux swap filesystem"
516 default n
517 depends on VOLUMEID
518 help
519 TODO
520
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000521### config FEATURE_VOLUMEID_LVM
522### bool "lvm"
523### default n
524### depends on VOLUMEID
525### help
526### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000527
528config FEATURE_VOLUMEID_CRAMFS
529 bool "cramfs filesystem"
530 default n
531 depends on VOLUMEID
532 help
533 TODO
534
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000535### config FEATURE_VOLUMEID_HPFS
536### bool "hpfs filesystem"
537### default n
538### depends on VOLUMEID
539### help
540### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000541
542config FEATURE_VOLUMEID_ROMFS
543 bool "romfs filesystem"
544 default n
545 depends on VOLUMEID
546 help
547 TODO
548
549config FEATURE_VOLUMEID_SYSV
550 bool "sysv filesystem"
551 default n
552 depends on VOLUMEID
553 help
554 TODO
555
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000556### config FEATURE_VOLUMEID_MINIX
557### bool "minix filesystem"
558### default n
559### depends on VOLUMEID
560### help
561### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000562
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000563### These only detect partition tables - not used (yet?)
564### config FEATURE_VOLUMEID_MAC
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000565### bool "mac filesystem"
566### default n
567### depends on VOLUMEID
568### help
569### TODO
Denis Vlasenko1f228982008-04-22 00:16:29 +0000570###
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000571### config FEATURE_VOLUMEID_MSDOS
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000572### bool "msdos filesystem"
573### default n
574### depends on VOLUMEID
575### help
576### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000577
578config FEATURE_VOLUMEID_OCFS2
579 bool "ocfs2 filesystem"
580 default n
581 depends on VOLUMEID
582 help
583 TODO
584
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000585### config FEATURE_VOLUMEID_HIGHPOINTRAID
586### bool "highpoint raid"
587### default n
588### depends on VOLUMEID
589### help
590### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000591
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000592### config FEATURE_VOLUMEID_ISWRAID
593### bool "intel raid"
594### default n
595### depends on VOLUMEID
596### help
597### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000598
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000599### config FEATURE_VOLUMEID_LSIRAID
600### bool "lsi raid"
601### default n
602### depends on VOLUMEID
603### help
604### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000605
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000606### config FEATURE_VOLUMEID_VIARAID
607### bool "via raid"
608### default n
609### depends on VOLUMEID
610### help
611### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000612
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000613### config FEATURE_VOLUMEID_SILICONRAID
614### bool "silicon raid"
615### default n
616### depends on VOLUMEID
617### help
618### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000619
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000620### config FEATURE_VOLUMEID_NVIDIARAID
621### bool "nvidia raid"
622### default n
623### depends on VOLUMEID
624### help
625### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000626
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000627### config FEATURE_VOLUMEID_PROMISERAID
628### bool "promise raid"
629### default n
630### depends on VOLUMEID
631### help
632### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000633
634config FEATURE_VOLUMEID_LINUXRAID
635 bool "linuxraid"
636 default n
637 depends on VOLUMEID
638 help
639 TODO
640
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000641config MOUNT
Mike Frysinger55092282006-02-02 23:14:57 +0000642 bool "mount"
643 default n
644 help
645 All files and filesystems in Unix are arranged into one big directory
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000646 tree. The 'mount' utility is used to graft a filesystem onto a
647 particular part of the tree. A filesystem can either live on a block
Mike Frysinger55092282006-02-02 23:14:57 +0000648 device, or it can be accessible over the network, as is the case with
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000649 NFS filesystems. Most people using BusyBox will also want to enable
Mike Frysinger55092282006-02-02 23:14:57 +0000650 the 'mount' utility.
651
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000652config FEATURE_MOUNT_FAKE
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000653 bool "Support option -f"
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000654 default n
655 depends on MOUNT
656 help
657 Enable support for faking a file system mount.
658
Denis Vlasenkof732e962008-02-18 12:07:49 +0000659config FEATURE_MOUNT_VERBOSE
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000660 bool "Support option -v"
Denis Vlasenkof732e962008-02-18 12:07:49 +0000661 default n
662 depends on MOUNT
663 help
664 Enable multi-level -v[vv...] verbose messages. Useful if you
665 debug mount problems and want to see what is exactly passed
666 to the kernel.
667
Denis Vlasenko2535f122007-09-15 13:28:30 +0000668config FEATURE_MOUNT_HELPERS
669 bool "Support mount helpers"
670 default n
671 depends on MOUNT
672 help
673 Enable mounting of virtual file systems via external helpers.
Denis Vlasenko32d49bc2008-02-03 23:52:41 +0000674 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
675 "obexfs -b00.11.22.33.44.55 /mnt"
676 Also "mount -t sometype [-o opts] fs /mnt" will try
677 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
678 The idea is to use such virtual filesystems in /etc/fstab.
Denis Vlasenko2535f122007-09-15 13:28:30 +0000679
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000680config FEATURE_MOUNT_LABEL
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000681 bool "Support specifiying devices by label or UUID"
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000682 default n
683 depends on MOUNT
Denis Vlasenko4824cca2008-03-21 18:29:01 +0000684 select VOLUMEID
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000685 help
686 This allows for specifying a device by label or uuid, rather than by
Denis Vlasenko1e19afd2008-10-12 11:20:08 +0000687 name. This feature utilizes the same functionality as blkid/findfs.
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000688
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000689config FEATURE_MOUNT_NFS
Rob Landley2ec922e2006-04-13 23:22:16 +0000690 bool "Support mounting NFS file systems"
Mike Frysinger55092282006-02-02 23:14:57 +0000691 default n
Denis Vlasenkoa7825f22007-06-16 13:56:51 +0000692 depends on MOUNT
693 select FEATURE_HAVE_RPC
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000694 select FEATURE_SYSLOG
Mike Frysinger55092282006-02-02 23:14:57 +0000695 help
Rob Landleye3781b72006-08-08 01:39:49 +0000696 Enable mounting of NFS file systems.
697
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000698config FEATURE_MOUNT_CIFS
Rob Landley89d9d4d2006-09-01 08:10:44 +0000699 bool "Support mounting CIFS/SMB file systems"
700 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000701 depends on MOUNT
Rob Landley89d9d4d2006-09-01 08:10:44 +0000702 help
703 Enable support for samba mounts.
Denis Vlasenko39e93cc2006-09-10 18:38:17 +0000704
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000705config FEATURE_MOUNT_FLAGS
706 depends on MOUNT
Denis Vlasenko39e93cc2006-09-10 18:38:17 +0000707 bool "Support lots of -o flags in mount"
Rob Landleye3781b72006-08-08 01:39:49 +0000708 default y
709 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000710 Without this, mount only supports ro/rw/remount. With this, it
Rob Landleye3781b72006-08-08 01:39:49 +0000711 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
712 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
713 private, unbindable, rshared, rslave, rprivate, and runbindable.
714
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000715config FEATURE_MOUNT_FSTAB
716 depends on MOUNT
Rob Landleye3781b72006-08-08 01:39:49 +0000717 bool "Support /etc/fstab and -a"
718 default y
719 help
720 Support mount all and looking for files in /etc/fstab.
Mike Frysinger55092282006-02-02 23:14:57 +0000721
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000722config PIVOT_ROOT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000723 bool "pivot_root"
724 default n
725 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000726 The pivot_root utility swaps the mount points for the root filesystem
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000727 with some other mounted filesystem. This allows you to do all sorts
Eric Andersena0ac4522003-02-27 03:14:04 +0000728 of wild and crazy things with your Linux system and is far more
729 powerful than 'chroot'.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000730
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000731 Note: This is for initrd in linux 2.4. Under initramfs (introduced
Rob Landley0f34a822005-10-27 22:55:50 +0000732 in linux 2.6) use switch_root instead.
733
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000734config RDATE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000735 bool "rdate"
736 default n
737 help
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000738 The rdate utility allows you to synchronize the date and time of your
Eric Andersena0ac4522003-02-27 03:14:04 +0000739 system clock with the date and time of a remote networked system using
740 the RFC868 protocol, which is built into the inetd daemon on most
741 systems.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000742
Bernhard Reutner-Fischerc77e8432008-08-19 11:28:52 +0000743config RDEV
744 bool "rdev"
745 default n
746 help
747 Print the device node associated with the filesystem mounted at '/'.
748
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000749config READPROFILE
Mike Frysinger75aa1922005-09-24 23:12:38 +0000750 bool "readprofile"
751 default n
752 help
753 This allows you to parse /proc/profile for basic profiling.
754
Mike Frysinger6b160e42008-02-15 02:27:19 +0000755config RTCWAKE
756 bool "rtcwake"
757 default n
758 help
759 Enter a system sleep state until specified wakeup time.
760
Denis Vlasenko376003b2008-04-21 05:05:17 +0000761config SCRIPT
762 bool "script"
763 default n
764 help
765 The script makes typescript of terminal session.
766
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000767config SETARCH
Mike Frysinger0a6b0bf2006-02-21 04:26:52 +0000768 bool "setarch"
769 default n
770 help
771 The linux32 utility is used to create a 32bit environment for the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000772 specified program (usually a shell). It only makes sense to have
Mike Frysinger0a6b0bf2006-02-21 04:26:52 +0000773 this util on a system that supports both 64bit and 32bit userland
774 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
775
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000776config SWAPONOFF
Eric Andersenc9f20d92002-12-05 08:41:41 +0000777 bool "swaponoff"
778 default n
779 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000780 This option enables both the 'swapon' and the 'swapoff' utilities.
781 Once you have created some swap space using 'mkswap', you also need
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000782 to enable your swap space with the 'swapon' utility. The 'swapoff'
Eric Andersena0ac4522003-02-27 03:14:04 +0000783 utility is used, typically at system shutdown, to disable any swap
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000784 space. If you are not using any swap space, you can leave this
Eric Andersena0ac4522003-02-27 03:14:04 +0000785 option disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000786
Denis Vlasenkoee56e012008-05-18 23:05:34 +0000787config FEATURE_SWAPON_PRI
Bernhard Reutner-Fischer3576bed2008-05-19 08:25:23 +0000788 bool "Support priority option -p"
Denis Vlasenkoee56e012008-05-18 23:05:34 +0000789 default n
790 depends on SWAPONOFF
791 help
792 Enable support for setting swap device priority in swapon.
793
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000794config SWITCH_ROOT
Mike Frysinger55092282006-02-02 23:14:57 +0000795 bool "switch_root"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000796 default n
797 help
Mike Frysinger55092282006-02-02 23:14:57 +0000798 The switch_root utility is used from initramfs to select a new
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000799 root device. Under initramfs, you have to use this instead of
800 pivot_root. (Stop reading here if you don't care why.)
Eric Andersenc9f20d92002-12-05 08:41:41 +0000801
Mike Frysinger55092282006-02-02 23:14:57 +0000802 Booting with initramfs extracts a gzipped cpio archive into rootfs
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000803 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
804 or unmounted*, pivot_root will not work from initramfs. Instead,
Mike Frysinger55092282006-02-02 23:14:57 +0000805 switch_root deletes everything out of rootfs (including itself),
806 does a mount --move that overmounts rootfs with the new root, and
807 then execs the specified init program.
808
809 * Because the Linux kernel uses rootfs internally as the starting
810 and ending point for searching through the kernel's doubly linked
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000811 list of active mount points. That's why.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000812
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000813config UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000814 bool "umount"
815 default n
816 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000817 When you want to remove a mounted filesystem from its current mount
818 point, for example when you are shutting down the system, the
819 'umount' utility is the tool to use. If you enabled the 'mount'
820 utility, you almost certainly also want to enable 'umount'.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000821
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000822config FEATURE_UMOUNT_ALL
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000823 bool "Support option -a"
Rob Landleycc6d8d32006-02-08 20:06:57 +0000824 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000825 depends on UMOUNT
Rob Landleycc6d8d32006-02-08 20:06:57 +0000826 help
827 Support -a option to unmount all currently mounted filesystems.
828
Eric Andersenc9f20d92002-12-05 08:41:41 +0000829comment "Common options for mount/umount"
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000830 depends on MOUNT || UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000831
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000832config FEATURE_MOUNT_LOOP
Rob Landley2ec922e2006-04-13 23:22:16 +0000833 bool "Support loopback mounts"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000834 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000835 depends on MOUNT || UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000836 help
Rob Landley6a6798b2005-08-10 20:35:54 +0000837 Enabling this feature allows automatic mounting of files (containing
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000838 filesystem images) via the linux kernel's loopback devices.
839 The mount command will detect you are trying to mount a file instead
840 of a block device, and transparently associate the file with a
841 loopback device. The umount command will also free that loopback
842 device.
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000843
Rob Landley6a6798b2005-08-10 20:35:54 +0000844 You can still use the 'losetup' utility (to manually associate files
Mike Frysinger71a6a4e2007-01-24 08:24:43 +0000845 with loop devices) if you need to do something advanced, such as
Rob Landley6a6798b2005-08-10 20:35:54 +0000846 specify an offset or cryptographic options to the loopback device.
847 (If you don't want umount to free the loop device, use "umount -D".)
Paul Fox3f6f3172005-07-19 20:55:37 +0000848
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000849config FEATURE_MTAB_SUPPORT
Rob Landley2ec922e2006-04-13 23:22:16 +0000850 bool "Support for the old /etc/mtab file"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000851 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000852 depends on MOUNT || UMOUNT
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000853 select FEATURE_MOUNT_FAKE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000854 help
Rob Landley6a6798b2005-08-10 20:35:54 +0000855 Historically, Unix systems kept track of the currently mounted
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000856 partitions in the file "/etc/mtab". These days, the kernel exports
Rob Landley6a6798b2005-08-10 20:35:54 +0000857 the list of currently mounted partitions in "/proc/mounts", rendering
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000858 the old mtab file obsolete. (In modern systems, /etc/mtab should be
Rob Landley6a6798b2005-08-10 20:35:54 +0000859 a symlink to /proc/mounts.)
Eric Andersena0ac4522003-02-27 03:14:04 +0000860
Rob Landley6a6798b2005-08-10 20:35:54 +0000861 The only reason to have mount maintain an /etc/mtab file itself is if
862 your stripped-down embedded system does not have a /proc directory.
863 If you must use this, keep in mind it's inherently brittle (for
864 example a mount under chroot won't update it), can't handle modern
865 features like separate per-process filesystem namespaces, requires
866 that your /etc directory be writeable, tends to get easily confused
Rob Landley17507fa2006-05-08 02:22:24 +0000867 by --bind or --move mounts, won't update if you rename a directory
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000868 that contains a mount point, and so on. (In brief: avoid.)
Rob Landley17507fa2006-05-08 02:22:24 +0000869
870 About the only reason to use this is if you've removed /proc from
871 your kernel.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000872
Eric Andersenc9f20d92002-12-05 08:41:41 +0000873endmenu