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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 Vlasenko7d219aa2006-10-05 10:17:08 +0000236config GETOPT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000237 bool "getopt"
238 default n
239 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000240 The getopt utility is used to break up (parse) options in command
241 lines to make it easy to write complex shell scripts that also check
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000242 for legal (and illegal) options. If you want to write horribly
Eric Andersena0ac4522003-02-27 03:14:04 +0000243 complex shell scripts, or use some horribly complex shell script
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000244 written by others, this utility may be for you. Most people will
Eric Andersena0ac4522003-02-27 03:14:04 +0000245 wisely leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000246
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000247config HEXDUMP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000248 bool "hexdump"
249 default n
250 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000251 The hexdump utility is used to display binary data in a readable
252 way that is comparable to the output from most hex editors.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000253
Denis Vlasenkofbe5f392007-11-18 05:36:50 +0000254config FEATURE_HEXDUMP_REVERSE
255 bool "Support -R, reverse of 'hexdump -Cv'"
256 default n
257 depends on HEXDUMP
258 help
259 The hexdump utility is used to display binary data in an ascii
260 readable way. This option creates binary data from an ascii input.
261 NB: this option is non-standard. It's unwise to use it in scripts
262 aimed to be portable.
263
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000264config HD
265 bool "hd"
266 default n
267 select HEXDUMP
268 help
269 hd is an alias to hexdump -C.
270
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000271config HWCLOCK
Eric Andersenc9f20d92002-12-05 08:41:41 +0000272 bool "hwclock"
273 default n
274 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000275 The hwclock utility is used to read and set the hardware clock
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000276 on a system. This is primarily used to set the current time on
Eric Andersen88c916b2003-10-22 09:58:56 +0000277 shutdown in the hardware clock, so the hardware will keep the
278 correct time when Linux is _not_ running.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000279
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000280config FEATURE_HWCLOCK_LONG_OPTIONS
Rob Landley2ec922e2006-04-13 23:22:16 +0000281 bool "Support long options (--hctosys,...)"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000282 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000283 depends on HWCLOCK && GETOPT_LONG
Eric Andersenc9f20d92002-12-05 08:41:41 +0000284 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000285 By default, the hwclock utility only uses short options. If you
Eric Andersen88c916b2003-10-22 09:58:56 +0000286 are overly fond of its long options, such as --hctosys, --utc, etc)
Eric Andersena0ac4522003-02-27 03:14:04 +0000287 then enable this option.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000288
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000289config FEATURE_HWCLOCK_ADJTIME_FHS
Rob Landley2ec922e2006-04-13 23:22:16 +0000290 bool "Use FHS /var/lib/hwclock/adjtime"
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000291 default y
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000292 depends on HWCLOCK
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000293 help
294 Starting with FHS 2.3, the adjtime state file is supposed to exist
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000295 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000296 to use the FHS behavior, answer Y here, otherwise answer N for the
297 classic /etc/adjtime path.
298
Bernhard Reutner-Fischere99a92d2008-07-22 18:32:06 +0000299 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
Mike Frysinger747fc5d2005-09-28 03:21:21 +0000300
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000301config IPCRM
Rob Landley6eb1e412005-06-20 04:30:36 +0000302 bool "ipcrm"
303 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000304 select FEATURE_SUID
Rob Landley6eb1e412005-06-20 04:30:36 +0000305 help
306 The ipcrm utility allows the removal of System V interprocess
307 communication (IPC) objects and the associated data structures
308 from the system.
309
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000310config IPCS
Rob Landley6eb1e412005-06-20 04:30:36 +0000311 bool "ipcs"
312 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000313 select FEATURE_SUID
Rob Landley6eb1e412005-06-20 04:30:36 +0000314 help
315 The ipcs utility is used to provide information on the currently
316 allocated System V interprocess (IPC) objects in the system.
317
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000318config LOSETUP
Mike Frysinger75aa1922005-09-24 23:12:38 +0000319 bool "losetup"
320 default n
321 help
322 losetup is used to associate or detach a loop device with a regular
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000323 file or block device, and to query the status of a loop device. This
Mike Frysinger75aa1922005-09-24 23:12:38 +0000324 version does not currently support enabling data encryption.
325
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000326config MDEV
Rob Landley70f7ef72005-12-13 08:21:33 +0000327 bool "mdev"
328 default n
329 help
Mike Frysingerae302102007-02-14 13:20:29 +0000330 mdev is a mini-udev implementation for dynamically creating device
331 nodes in the /dev directory.
332
333 For more information, please see docs/mdev.txt
Rob Landley70f7ef72005-12-13 08:21:33 +0000334
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000335config FEATURE_MDEV_CONF
Rob Landley2ec922e2006-04-13 23:22:16 +0000336 bool "Support /etc/mdev.conf"
Rob Landley70f7ef72005-12-13 08:21:33 +0000337 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000338 depends on MDEV
Rob Landley70f7ef72005-12-13 08:21:33 +0000339 help
Mike Frysingerae302102007-02-14 13:20:29 +0000340 Add support for the mdev config file to control ownership and
341 permissions of the device nodes.
Rob Landley70f7ef72005-12-13 08:21:33 +0000342
Mike Frysingerae302102007-02-14 13:20:29 +0000343 For more information, please see docs/mdev.txt
Rob Landley70f7ef72005-12-13 08:21:33 +0000344
Mike Frysingerf0044c42008-02-01 06:53:50 +0000345config FEATURE_MDEV_RENAME
346 bool "Support subdirs/symlinks"
347 default n
348 depends on FEATURE_MDEV_CONF
349 help
350 Add support for renaming devices and creating symlinks.
351
352 For more information, please see docs/mdev.txt
353
Denis Vlasenkof2f38682008-03-29 17:26:10 +0000354config FEATURE_MDEV_RENAME_REGEXP
355 bool "Support regular expressions substitutions when renaming device"
356 default n
357 depends on FEATURE_MDEV_RENAME
358 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000359 Add support for regular expressions substitutions when renaming
360 device.
Denis Vlasenkof2f38682008-03-29 17:26:10 +0000361
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000362config FEATURE_MDEV_EXEC
Rob Landleyef10d522006-06-26 14:11:33 +0000363 bool "Support command execution at device addition/removal"
364 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000365 depends on FEATURE_MDEV_CONF
Rob Landleyef10d522006-06-26 14:11:33 +0000366 help
Mike Frysingerae302102007-02-14 13:20:29 +0000367 This adds support for an optional field to /etc/mdev.conf for
368 executing commands when devices are created/removed.
Rob Landleyef10d522006-06-26 14:11:33 +0000369
Mike Frysingerae302102007-02-14 13:20:29 +0000370 For more information, please see docs/mdev.txt
Rob Landleyef10d522006-06-26 14:11:33 +0000371
Mike Frysingera78ef2c2007-06-13 07:34:15 +0000372config FEATURE_MDEV_LOAD_FIRMWARE
373 bool "Support loading of firmwares"
374 default n
375 depends on MDEV
376 help
377 Some devices need to load firmware before they can be usable.
378
379 These devices will request userspace look up the files in
380 /lib/firmware/ and if it exists, send it to the kernel for
381 loading into the hardware.
382
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000383config MKSWAP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000384 bool "mkswap"
385 default n
386 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000387 The mkswap utility is used to configure a file or disk partition as
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000388 Linux swap space. This allows Linux to use the entire file or
Eric Andersena0ac4522003-02-27 03:14:04 +0000389 partition as if it were additional RAM, which can greatly increase
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000390 the capability of low-memory machines. This additional memory is
Eric Andersena0ac4522003-02-27 03:14:04 +0000391 much slower than real RAM, but can be very helpful at preventing your
Eric Andersen88c916b2003-10-22 09:58:56 +0000392 applications being killed by the Linux out of memory (OOM) killer.
393 Once you have created swap space using 'mkswap' you need to enable
394 the swap space using the 'swapon' utility.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000395
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000396config FEATURE_MKSWAP_V0
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000397 bool "Version 0 support"
Bernhard Reutner-Fischer56dd0bf2006-03-29 17:32:24 +0000398 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000399 depends on MKSWAP
400# depends on MKSWAP && DEPRECATED
Bernhard Reutner-Fischer56dd0bf2006-03-29 17:32:24 +0000401 help
402 Enable support for the old v0 style.
403 If your kernel is older than 2.1.117, then v0 support is the
404 only option.
405
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000406config MORE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000407 bool "more"
408 default n
409 help
Eric Andersen88c916b2003-10-22 09:58:56 +0000410 more is a simple utility which allows you to read text one screen
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000411 sized page at a time. If you want to read text that is larger than
Eric Andersena0ac4522003-02-27 03:14:04 +0000412 the screen, and you are using anything faster than a 300 baud modem,
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000413 you will probably find this utility very helpful. If you don't have
Eric Andersena0ac4522003-02-27 03:14:04 +0000414 any need to reading text files, you can leave this disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000415
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000416config FEATURE_USE_TERMIOS
Rob Landley2ec922e2006-04-13 23:22:16 +0000417 bool "Use termios to manipulate the screen"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000418 default y
Paul Fox9e1f92d2008-03-20 16:04:36 +0000419 depends on MORE || TOP
Eric Andersenc9f20d92002-12-05 08:41:41 +0000420 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000421 This option allows utilities such as 'more' and 'top' to determine
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000422 the size of the screen. If you leave this disabled, your utilities
Eric Andersen88c916b2003-10-22 09:58:56 +0000423 that display things on the screen will be especially primitive and
Eric Andersena0ac4522003-02-27 03:14:04 +0000424 will be unable to determine the current screen size, and will be
425 unable to move the cursor.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000426
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000427config VOLUMEID
Denis Vlasenko35a064b2008-11-06 00:49:59 +0000428 bool #No description makes it a hidden option
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000429 default n
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000430
431config FEATURE_VOLUMEID_EXT
432 bool "Ext filesystem"
433 default n
434 depends on VOLUMEID
435 help
436 TODO
437
438config FEATURE_VOLUMEID_REISERFS
439 bool "Reiser filesystem"
440 default n
441 depends on VOLUMEID
442 help
443 TODO
444
445config FEATURE_VOLUMEID_FAT
446 bool "fat filesystem"
447 default n
448 depends on VOLUMEID
449 help
450 TODO
451
452config FEATURE_VOLUMEID_HFS
453 bool "hfs filesystem"
454 default n
455 depends on VOLUMEID
456 help
457 TODO
458
459config FEATURE_VOLUMEID_JFS
460 bool "jfs filesystem"
461 default n
462 depends on VOLUMEID
463 help
464 TODO
465
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000466### config FEATURE_VOLUMEID_UFS
467### bool "ufs filesystem"
468### default n
469### depends on VOLUMEID
470### help
471### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000472
473config FEATURE_VOLUMEID_XFS
474 bool "xfs filesystem"
475 default n
476 depends on VOLUMEID
477 help
478 TODO
479
480config FEATURE_VOLUMEID_NTFS
481 bool "ntfs filesystem"
482 default n
483 depends on VOLUMEID
484 help
485 TODO
486
487config FEATURE_VOLUMEID_ISO9660
488 bool "iso9660 filesystem"
489 default n
490 depends on VOLUMEID
491 help
492 TODO
493
494config FEATURE_VOLUMEID_UDF
495 bool "udf filesystem"
496 default n
497 depends on VOLUMEID
498 help
499 TODO
500
501config FEATURE_VOLUMEID_LUKS
502 bool "luks filesystem"
503 default n
504 depends on VOLUMEID
505 help
506 TODO
507
508config FEATURE_VOLUMEID_LINUXSWAP
509 bool "linux swap filesystem"
510 default n
511 depends on VOLUMEID
512 help
513 TODO
514
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000515### config FEATURE_VOLUMEID_LVM
516### bool "lvm"
517### default n
518### depends on VOLUMEID
519### help
520### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000521
522config FEATURE_VOLUMEID_CRAMFS
523 bool "cramfs filesystem"
524 default n
525 depends on VOLUMEID
526 help
527 TODO
528
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000529### config FEATURE_VOLUMEID_HPFS
530### bool "hpfs filesystem"
531### default n
532### depends on VOLUMEID
533### help
534### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000535
536config FEATURE_VOLUMEID_ROMFS
537 bool "romfs filesystem"
538 default n
539 depends on VOLUMEID
540 help
541 TODO
542
543config FEATURE_VOLUMEID_SYSV
544 bool "sysv filesystem"
545 default n
546 depends on VOLUMEID
547 help
548 TODO
549
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000550### config FEATURE_VOLUMEID_MINIX
551### bool "minix filesystem"
552### default n
553### depends on VOLUMEID
554### help
555### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000556
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000557### These only detect partition tables - not used (yet?)
558### config FEATURE_VOLUMEID_MAC
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000559### bool "mac filesystem"
560### default n
561### depends on VOLUMEID
562### help
563### TODO
Denis Vlasenko1f228982008-04-22 00:16:29 +0000564###
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000565### config FEATURE_VOLUMEID_MSDOS
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000566### bool "msdos filesystem"
567### default n
568### depends on VOLUMEID
569### help
570### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000571
572config FEATURE_VOLUMEID_OCFS2
573 bool "ocfs2 filesystem"
574 default n
575 depends on VOLUMEID
576 help
577 TODO
578
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000579### config FEATURE_VOLUMEID_HIGHPOINTRAID
580### bool "highpoint raid"
581### default n
582### depends on VOLUMEID
583### help
584### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000585
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000586### config FEATURE_VOLUMEID_ISWRAID
587### bool "intel raid"
588### default n
589### depends on VOLUMEID
590### help
591### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000592
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000593### config FEATURE_VOLUMEID_LSIRAID
594### bool "lsi raid"
595### default n
596### depends on VOLUMEID
597### help
598### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000599
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000600### config FEATURE_VOLUMEID_VIARAID
601### bool "via raid"
602### default n
603### depends on VOLUMEID
604### help
605### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000606
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000607### config FEATURE_VOLUMEID_SILICONRAID
608### bool "silicon raid"
609### default n
610### depends on VOLUMEID
611### help
612### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000613
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000614### config FEATURE_VOLUMEID_NVIDIARAID
615### bool "nvidia raid"
616### default n
617### depends on VOLUMEID
618### help
619### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000620
Denis Vlasenkod25c33f2008-03-17 09:25:05 +0000621### config FEATURE_VOLUMEID_PROMISERAID
622### bool "promise raid"
623### default n
624### depends on VOLUMEID
625### help
626### TODO
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000627
628config FEATURE_VOLUMEID_LINUXRAID
629 bool "linuxraid"
630 default n
631 depends on VOLUMEID
632 help
633 TODO
634
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000635config MOUNT
Mike Frysinger55092282006-02-02 23:14:57 +0000636 bool "mount"
637 default n
638 help
639 All files and filesystems in Unix are arranged into one big directory
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000640 tree. The 'mount' utility is used to graft a filesystem onto a
641 particular part of the tree. A filesystem can either live on a block
Mike Frysinger55092282006-02-02 23:14:57 +0000642 device, or it can be accessible over the network, as is the case with
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000643 NFS filesystems. Most people using BusyBox will also want to enable
Mike Frysinger55092282006-02-02 23:14:57 +0000644 the 'mount' utility.
645
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000646config FEATURE_MOUNT_FAKE
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000647 bool "Support option -f"
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000648 default n
649 depends on MOUNT
650 help
651 Enable support for faking a file system mount.
652
Denis Vlasenkof732e962008-02-18 12:07:49 +0000653config FEATURE_MOUNT_VERBOSE
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000654 bool "Support option -v"
Denis Vlasenkof732e962008-02-18 12:07:49 +0000655 default n
656 depends on MOUNT
657 help
658 Enable multi-level -v[vv...] verbose messages. Useful if you
659 debug mount problems and want to see what is exactly passed
660 to the kernel.
661
Denis Vlasenko2535f122007-09-15 13:28:30 +0000662config FEATURE_MOUNT_HELPERS
663 bool "Support mount helpers"
664 default n
665 depends on MOUNT
666 help
667 Enable mounting of virtual file systems via external helpers.
Denis Vlasenko32d49bc2008-02-03 23:52:41 +0000668 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
669 "obexfs -b00.11.22.33.44.55 /mnt"
670 Also "mount -t sometype [-o opts] fs /mnt" will try
671 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
672 The idea is to use such virtual filesystems in /etc/fstab.
Denis Vlasenko2535f122007-09-15 13:28:30 +0000673
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000674config FEATURE_MOUNT_LABEL
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000675 bool "Support specifiying devices by label or UUID"
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000676 default n
677 depends on MOUNT
Denis Vlasenko4824cca2008-03-21 18:29:01 +0000678 select VOLUMEID
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000679 help
680 This allows for specifying a device by label or uuid, rather than by
Denis Vlasenko1e19afd2008-10-12 11:20:08 +0000681 name. This feature utilizes the same functionality as blkid/findfs.
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000682
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000683config FEATURE_MOUNT_NFS
Rob Landley2ec922e2006-04-13 23:22:16 +0000684 bool "Support mounting NFS file systems"
Mike Frysinger55092282006-02-02 23:14:57 +0000685 default n
Denis Vlasenkoa7825f22007-06-16 13:56:51 +0000686 depends on MOUNT
687 select FEATURE_HAVE_RPC
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000688 select FEATURE_SYSLOG
Mike Frysinger55092282006-02-02 23:14:57 +0000689 help
Rob Landleye3781b72006-08-08 01:39:49 +0000690 Enable mounting of NFS file systems.
691
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000692config FEATURE_MOUNT_CIFS
Rob Landley89d9d4d2006-09-01 08:10:44 +0000693 bool "Support mounting CIFS/SMB file systems"
694 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000695 depends on MOUNT
Rob Landley89d9d4d2006-09-01 08:10:44 +0000696 help
697 Enable support for samba mounts.
Denis Vlasenko39e93cc2006-09-10 18:38:17 +0000698
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000699config FEATURE_MOUNT_FLAGS
700 depends on MOUNT
Denis Vlasenko39e93cc2006-09-10 18:38:17 +0000701 bool "Support lots of -o flags in mount"
Rob Landleye3781b72006-08-08 01:39:49 +0000702 default y
703 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000704 Without this, mount only supports ro/rw/remount. With this, it
Rob Landleye3781b72006-08-08 01:39:49 +0000705 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
706 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
707 private, unbindable, rshared, rslave, rprivate, and runbindable.
708
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000709config FEATURE_MOUNT_FSTAB
710 depends on MOUNT
Rob Landleye3781b72006-08-08 01:39:49 +0000711 bool "Support /etc/fstab and -a"
712 default y
713 help
714 Support mount all and looking for files in /etc/fstab.
Mike Frysinger55092282006-02-02 23:14:57 +0000715
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000716config PIVOT_ROOT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000717 bool "pivot_root"
718 default n
719 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000720 The pivot_root utility swaps the mount points for the root filesystem
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000721 with some other mounted filesystem. This allows you to do all sorts
Eric Andersena0ac4522003-02-27 03:14:04 +0000722 of wild and crazy things with your Linux system and is far more
723 powerful than 'chroot'.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000724
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000725 Note: This is for initrd in linux 2.4. Under initramfs (introduced
Rob Landley0f34a822005-10-27 22:55:50 +0000726 in linux 2.6) use switch_root instead.
727
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000728config RDATE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000729 bool "rdate"
730 default n
731 help
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000732 The rdate utility allows you to synchronize the date and time of your
Eric Andersena0ac4522003-02-27 03:14:04 +0000733 system clock with the date and time of a remote networked system using
734 the RFC868 protocol, which is built into the inetd daemon on most
735 systems.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000736
Bernhard Reutner-Fischerc77e8432008-08-19 11:28:52 +0000737config RDEV
738 bool "rdev"
739 default n
740 help
741 Print the device node associated with the filesystem mounted at '/'.
742
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000743config READPROFILE
Mike Frysinger75aa1922005-09-24 23:12:38 +0000744 bool "readprofile"
745 default n
746 help
747 This allows you to parse /proc/profile for basic profiling.
748
Mike Frysinger6b160e42008-02-15 02:27:19 +0000749config RTCWAKE
750 bool "rtcwake"
751 default n
752 help
753 Enter a system sleep state until specified wakeup time.
754
Denis Vlasenko376003b2008-04-21 05:05:17 +0000755config SCRIPT
756 bool "script"
757 default n
758 help
759 The script makes typescript of terminal session.
760
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000761config SETARCH
Mike Frysinger0a6b0bf2006-02-21 04:26:52 +0000762 bool "setarch"
763 default n
764 help
765 The linux32 utility is used to create a 32bit environment for the
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000766 specified program (usually a shell). It only makes sense to have
Mike Frysinger0a6b0bf2006-02-21 04:26:52 +0000767 this util on a system that supports both 64bit and 32bit userland
768 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
769
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000770config SWAPONOFF
Eric Andersenc9f20d92002-12-05 08:41:41 +0000771 bool "swaponoff"
772 default n
773 help
Eric Andersena0ac4522003-02-27 03:14:04 +0000774 This option enables both the 'swapon' and the 'swapoff' utilities.
775 Once you have created some swap space using 'mkswap', you also need
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000776 to enable your swap space with the 'swapon' utility. The 'swapoff'
Eric Andersena0ac4522003-02-27 03:14:04 +0000777 utility is used, typically at system shutdown, to disable any swap
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000778 space. If you are not using any swap space, you can leave this
Eric Andersena0ac4522003-02-27 03:14:04 +0000779 option disabled.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000780
Denis Vlasenkoee56e012008-05-18 23:05:34 +0000781config FEATURE_SWAPON_PRI
Bernhard Reutner-Fischer3576bed2008-05-19 08:25:23 +0000782 bool "Support priority option -p"
Denis Vlasenkoee56e012008-05-18 23:05:34 +0000783 default n
784 depends on SWAPONOFF
785 help
786 Enable support for setting swap device priority in swapon.
787
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000788config SWITCH_ROOT
Mike Frysinger55092282006-02-02 23:14:57 +0000789 bool "switch_root"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000790 default n
791 help
Mike Frysinger55092282006-02-02 23:14:57 +0000792 The switch_root utility is used from initramfs to select a new
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000793 root device. Under initramfs, you have to use this instead of
794 pivot_root. (Stop reading here if you don't care why.)
Eric Andersenc9f20d92002-12-05 08:41:41 +0000795
Mike Frysinger55092282006-02-02 23:14:57 +0000796 Booting with initramfs extracts a gzipped cpio archive into rootfs
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000797 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
798 or unmounted*, pivot_root will not work from initramfs. Instead,
Mike Frysinger55092282006-02-02 23:14:57 +0000799 switch_root deletes everything out of rootfs (including itself),
800 does a mount --move that overmounts rootfs with the new root, and
801 then execs the specified init program.
802
803 * Because the Linux kernel uses rootfs internally as the starting
804 and ending point for searching through the kernel's doubly linked
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000805 list of active mount points. That's why.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000806
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000807config UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000808 bool "umount"
809 default n
810 help
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000811 When you want to remove a mounted filesystem from its current mount
812 point, for example when you are shutting down the system, the
813 'umount' utility is the tool to use. If you enabled the 'mount'
814 utility, you almost certainly also want to enable 'umount'.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000815
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000816config FEATURE_UMOUNT_ALL
Denis Vlasenko4ee7cd42008-03-17 09:13:22 +0000817 bool "Support option -a"
Rob Landleycc6d8d32006-02-08 20:06:57 +0000818 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000819 depends on UMOUNT
Rob Landleycc6d8d32006-02-08 20:06:57 +0000820 help
821 Support -a option to unmount all currently mounted filesystems.
822
Eric Andersenc9f20d92002-12-05 08:41:41 +0000823comment "Common options for mount/umount"
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000824 depends on MOUNT || UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000825
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000826config FEATURE_MOUNT_LOOP
Rob Landley2ec922e2006-04-13 23:22:16 +0000827 bool "Support loopback mounts"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000828 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000829 depends on MOUNT || UMOUNT
Eric Andersenc9f20d92002-12-05 08:41:41 +0000830 help
Rob Landley6a6798b2005-08-10 20:35:54 +0000831 Enabling this feature allows automatic mounting of files (containing
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000832 filesystem images) via the linux kernel's loopback devices.
833 The mount command will detect you are trying to mount a file instead
834 of a block device, and transparently associate the file with a
835 loopback device. The umount command will also free that loopback
836 device.
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000837
Rob Landley6a6798b2005-08-10 20:35:54 +0000838 You can still use the 'losetup' utility (to manually associate files
Mike Frysinger71a6a4e2007-01-24 08:24:43 +0000839 with loop devices) if you need to do something advanced, such as
Rob Landley6a6798b2005-08-10 20:35:54 +0000840 specify an offset or cryptographic options to the loopback device.
841 (If you don't want umount to free the loop device, use "umount -D".)
Paul Fox3f6f3172005-07-19 20:55:37 +0000842
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000843config FEATURE_MTAB_SUPPORT
Rob Landley2ec922e2006-04-13 23:22:16 +0000844 bool "Support for the old /etc/mtab file"
Eric Andersenc9f20d92002-12-05 08:41:41 +0000845 default n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000846 depends on MOUNT || UMOUNT
Denis Vlasenkob1d8e7d2008-02-16 23:28:42 +0000847 select FEATURE_MOUNT_FAKE
Eric Andersenc9f20d92002-12-05 08:41:41 +0000848 help
Rob Landley6a6798b2005-08-10 20:35:54 +0000849 Historically, Unix systems kept track of the currently mounted
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000850 partitions in the file "/etc/mtab". These days, the kernel exports
Rob Landley6a6798b2005-08-10 20:35:54 +0000851 the list of currently mounted partitions in "/proc/mounts", rendering
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000852 the old mtab file obsolete. (In modern systems, /etc/mtab should be
Rob Landley6a6798b2005-08-10 20:35:54 +0000853 a symlink to /proc/mounts.)
Eric Andersena0ac4522003-02-27 03:14:04 +0000854
Rob Landley6a6798b2005-08-10 20:35:54 +0000855 The only reason to have mount maintain an /etc/mtab file itself is if
856 your stripped-down embedded system does not have a /proc directory.
857 If you must use this, keep in mind it's inherently brittle (for
858 example a mount under chroot won't update it), can't handle modern
859 features like separate per-process filesystem namespaces, requires
860 that your /etc directory be writeable, tends to get easily confused
Rob Landley17507fa2006-05-08 02:22:24 +0000861 by --bind or --move mounts, won't update if you rename a directory
Bernhard Reutner-Fischer3e8669f2008-07-22 18:27:53 +0000862 that contains a mount point, and so on. (In brief: avoid.)
Rob Landley17507fa2006-05-08 02:22:24 +0000863
864 About the only reason to use this is if you've removed /proc from
865 your kernel.
Eric Andersenc9f20d92002-12-05 08:41:41 +0000866
Eric Andersenc9f20d92002-12-05 08:41:41 +0000867endmenu