package/busybox/config/shell/Config.in

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see scripts/kbuild/config-language.txt.
   4 #
   5
   6 menu "Shells"
   7
   8
   9
  10 config BUSYBOX_CONFIG_ASH
  11         bool "ash"
  12         default y
  13         depends on !BUSYBOX_CONFIG_NOMMU
  14         help
  15           Tha 'ash' shell adds about 60k in the default configuration and is
  16           the most complete and most pedantically correct shell included with
  17           busybox. This shell is actually a derivative of the Debian 'dash'
  18           shell (by Herbert Xu), which was created by porting the 'ash' shell
  19           (written by Kenneth Almquist) from NetBSD.
  20
  21 config BUSYBOX_CONFIG_ASH_BASH_COMPAT
  22         bool "bash-compatible extensions"
  23         default y
  24         depends on BUSYBOX_CONFIG_ASH
  25         help
  26           Enable bash-compatible extensions.
  27
  28 config BUSYBOX_CONFIG_ASH_JOB_CONTROL
  29         bool "Job control"
  30         default y
  31         depends on BUSYBOX_CONFIG_ASH
  32         help
  33           Enable job control in the ash shell.
  34
  35 config BUSYBOX_CONFIG_ASH_ALIAS
  36         bool "alias support"
  37         default y
  38         depends on BUSYBOX_CONFIG_ASH
  39         help
  40           Enable alias support in the ash shell.
  41
  42 config BUSYBOX_CONFIG_ASH_GETOPTS
  43         bool "Builtin getopt to parse positional parameters"
  44         default y
  45         depends on BUSYBOX_CONFIG_ASH
  46         help
  47           Enable getopts builtin in the ash shell.
  48
  49 config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO
  50         bool "Builtin version of 'echo'"
  51         default y
  52         depends on BUSYBOX_CONFIG_ASH
  53         help
  54           Enable support for echo, builtin to ash.
  55
  56 config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF
  57         bool "Builtin version of 'printf'"
  58         default y
  59         depends on BUSYBOX_CONFIG_ASH
  60         help
  61           Enable support for printf, builtin to ash.
  62
  63 config BUSYBOX_CONFIG_ASH_BUILTIN_TEST
  64         bool "Builtin version of 'test'"
  65         default y
  66         depends on BUSYBOX_CONFIG_ASH
  67         help
  68           Enable support for test, builtin to ash.
  69
  70 config BUSYBOX_CONFIG_ASH_CMDCMD
  71         bool "'command' command to override shell builtins"
  72         default y
  73         depends on BUSYBOX_CONFIG_ASH
  74         help
  75           Enable support for the ash 'command' builtin, which allows
  76           you to run the specified command with the specified arguments,
  77           even when there is an ash builtin command with the same name.
  78
  79 config BUSYBOX_CONFIG_ASH_MAIL
  80         bool "Check for new mail on interactive shells"
  81         default n
  82         depends on BUSYBOX_CONFIG_ASH
  83         help
  84           Enable "check for new mail" in the ash shell.
  85
  86 config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE
  87         bool "Optimize for size instead of speed"
  88         default n
  89         depends on BUSYBOX_CONFIG_ASH
  90         help
  91           Compile ash for reduced size at the price of speed.
  92
  93 config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT
  94         bool "Pseudorandom generator and $RANDOM variable"
  95         default n
  96         depends on BUSYBOX_CONFIG_ASH
  97         help
  98           Enable pseudorandom generator and dynamic variable "$RANDOM".
  99           Each read of "$RANDOM" will generate a new pseudorandom value.
 100           You can reset the generator by using a specified start value.
 101           After "unset RANDOM" the generator will switch off and this
 102           variable will no longer have special treatment.
 103
 104 config BUSYBOX_CONFIG_ASH_EXPAND_PRMT
 105         bool "Expand prompt string"
 106         default y
 107         depends on BUSYBOX_CONFIG_ASH
 108         help
 109           "PS#" may contain volatile content, such as backquote commands.
 110           This option recreates the prompt string from the environment
 111           variable each time it is displayed.
 112
 113 config BUSYBOX_CONFIG_HUSH
 114         bool "hush"
 115         default n
 116         help
 117           hush is a small shell (22k). It handles the normal flow control
 118           constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
 119           case/esac. Redirections, here documents, $((arithmetic))
 120           and functions are supported.
 121
 122           It will compile and work on no-mmu systems.
 123
 124           It does not handle select, aliases, brace expansion,
 125           tilde expansion, &>file and >&file redirection of stdout+stderr.
 126
 127 config BUSYBOX_CONFIG_HUSH_BASH_COMPAT
 128         bool "bash-compatible extensions"
 129         default y
 130         depends on BUSYBOX_CONFIG_HUSH
 131         help
 132           Enable bash-compatible extensions.
 133
 134 config BUSYBOX_CONFIG_HUSH_HELP
 135         bool "help builtin"
 136         default y
 137         depends on BUSYBOX_CONFIG_HUSH
 138         help
 139           Enable help builtin in hush. Code size + ~1 kbyte.
 140
 141 config BUSYBOX_CONFIG_HUSH_INTERACTIVE
 142         bool "Interactive mode"
 143         default y
 144         depends on BUSYBOX_CONFIG_HUSH
 145         help
 146           Enable interactive mode (prompt and command editing).
 147           Without this, hush simply reads and executes commands
 148           from stdin just like a shell script from a file.
 149           No prompt, no PS1/PS2 magic shell variables.
 150
 151 config BUSYBOX_CONFIG_HUSH_JOB
 152         bool "Job control"
 153         default y
 154         depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE
 155         help
 156           Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
 157           command (not entire shell), fg/bg builtins work. Without this option,
 158           "cmd &" still works by simply spawning a process and immediately
 159           prompting for next command (or executing next command in a script),
 160           but no separate process group is formed.
 161
 162 config BUSYBOX_CONFIG_HUSH_TICK
 163         bool "Process substitution"
 164         default y
 165         depends on BUSYBOX_CONFIG_HUSH
 166         help
 167           Enable process substitution `command` and $(command) in hush.
 168
 169 config BUSYBOX_CONFIG_HUSH_IF
 170         bool "Support if/then/elif/else/fi"
 171         default y
 172         depends on BUSYBOX_CONFIG_HUSH
 173         help
 174           Enable if/then/elif/else/fi in hush.
 175
 176 config BUSYBOX_CONFIG_HUSH_LOOPS
 177         bool "Support for, while and until loops"
 178         default y
 179         depends on BUSYBOX_CONFIG_HUSH
 180         help
 181           Enable for, while and until loops in hush.
 182
 183 config BUSYBOX_CONFIG_HUSH_CASE
 184         bool "Support case ... esac statement"
 185         default y
 186         depends on BUSYBOX_CONFIG_HUSH
 187         help
 188           Enable case ... esac statement in hush. +400 bytes.
 189
 190 config BUSYBOX_CONFIG_HUSH_FUNCTIONS
 191         bool "Support funcname() { commands; } syntax"
 192         default y
 193         depends on BUSYBOX_CONFIG_HUSH
 194         help
 195           Enable support for shell functions in hush. +800 bytes.
 196
 197 config BUSYBOX_CONFIG_HUSH_LOCAL
 198         bool "Support local builtin"
 199         default y
 200         depends on BUSYBOX_CONFIG_HUSH_FUNCTIONS
 201         help
 202           Enable support for local variables in functions.
 203
 204 config BUSYBOX_CONFIG_HUSH_EXPORT_N
 205         bool "Support export '-n' option"
 206         default y
 207         depends on BUSYBOX_CONFIG_HUSH
 208         help
 209           Enable support for export '-n' option in hush. It is a bash extension.
 210
 211 config BUSYBOX_CONFIG_HUSH_RANDOM_SUPPORT
 212         bool "Pseudorandom generator and $RANDOM variable"
 213         default n
 214         depends on BUSYBOX_CONFIG_HUSH
 215         help
 216           Enable pseudorandom generator and dynamic variable "$RANDOM".
 217           Each read of "$RANDOM" will generate a new pseudorandom value.
 218
 219
 220 choice
 221         prompt "Choose which shell is aliased to 'sh' name"
 222         default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
 223         help
 224           Choose which shell you want to be executed by 'sh' alias.
 225           The ash shell is the most bash compatible and full featured one.
 226
 227 # note: cannot use "select ASH" here, it breaks "make allnoconfig"
 228 config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
 229         depends on BUSYBOX_CONFIG_ASH
 230         bool "ash"
 231         depends on !BUSYBOX_CONFIG_NOMMU
 232
 233 config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH
 234         depends on BUSYBOX_CONFIG_HUSH
 235         bool "hush"
 236
 237 config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE
 238         bool "none"
 239
 240 endchoice
 241
 242 choice
 243         prompt "Choose which shell is aliased to 'bash' name"
 244         default BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
 245         help
 246           Choose which shell you want to be executed by 'bash' alias.
 247           The ash shell is the most bash compatible and full featured one.
 248
 249           Note that selecting this option does not switch on any bash
 250           compatibility code. It merely makes it possible to install
 251           /bin/bash (sym)link and run scripts which start with
 252           #!/bin/bash line.
 253
 254           Many systems use it in scripts which use bash-specific features,
 255           even simple ones like $RANDOM. Without this option, busybox
 256           can't be used for running them because it won't recongnize
 257           "bash" as a supported applet name.
 258
 259 config BUSYBOX_CONFIG_FEATURE_BASH_IS_ASH
 260         depends on BUSYBOX_CONFIG_ASH
 261         bool "ash"
 262         depends on !BUSYBOX_CONFIG_NOMMU
 263
 264 config BUSYBOX_CONFIG_FEATURE_BASH_IS_HUSH
 265         depends on BUSYBOX_CONFIG_HUSH
 266         bool "hush"
 267
 268 config BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
 269         bool "none"
 270
 271 endchoice
 272
 273
 274 config BUSYBOX_CONFIG_LASH
 275         bool "lash (deprecated: aliased to hush)"
 276         default n
 277         select BUSYBOX_CONFIG_HUSH
 278         help
 279           lash is deprecated and will be removed, please migrate to hush.
 280
 281 config BUSYBOX_CONFIG_MSH
 282         bool "msh (deprecated: please use hush)"
 283         default n
 284         select BUSYBOX_CONFIG_HUSH
 285         help
 286           msh is deprecated and will be removed, please migrate to hush.
 287           If there is a feature msh has but hush does not, please let us know.
 288
 289 #         The minix shell (adds just 30k) is quite complete and handles things
 290 #         like for/do/done, case/esac and all the things you expect a Bourne
 291 #         shell to do. It is not always pedantically correct about Bourne
 292 #         shell grammar (try running the shell testscript "tests/sh.testcases"
 293 #         on it and compare vs bash) but for most things it works quite well.
 294 #         It uses only vfork, so it can be used on uClinux systems.
 295
 296
 297 config BUSYBOX_CONFIG_SH_MATH_SUPPORT
 298         bool "POSIX math support"
 299         default y
 300         depends on BUSYBOX_CONFIG_ASH || BUSYBOX_CONFIG_HUSH
 301         help
 302           Enable math support in the shell via $((...)) syntax.
 303
 304 config BUSYBOX_CONFIG_SH_MATH_SUPPORT_64
 305         bool "Extend POSIX math support to 64 bit"
 306         default y
 307         depends on BUSYBOX_CONFIG_SH_MATH_SUPPORT
 308         help
 309           Enable 64-bit math support in the shell. This will make the shell
 310           slightly larger, but will allow computation with very large numbers.
 311           This is not in POSIX, so do not rely on this in portable code.
 312
 313 config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET
 314         bool "Hide message on interactive shell startup"
 315         default n
 316         depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
 317         help
 318           Remove the busybox introduction when starting a shell.
 319
 320 config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE
 321         bool "Standalone shell"
 322         default n
 323         depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
 324         help
 325           This option causes busybox shells to use busybox applets
 326           in preference to executables in the PATH whenever possible. For
 327           example, entering the command 'ifconfig' into the shell would cause
 328           busybox to use the ifconfig busybox applet. Specifying the fully
 329           qualified executable name, such as '/sbin/ifconfig' will still
 330           execute the /sbin/ifconfig executable on the filesystem. This option
 331           is generally used when creating a statically linked version of busybox
 332           for use as a rescue shell, in the event that you screw up your system.
 333
 334           This is implemented by re-execing /proc/self/exe (typically)
 335           with right parameters. Some selected applets ("NOFORK" applets)
 336           can even be executed without creating new process.
 337           Instead, busybox will call <applet>_main() internally.
 338
 339           However, this causes problems in chroot jails without mounted /proc
 340           and with ps/top (command name can be shown as 'exe' for applets
 341           started this way).
 342 # untrue?
 343 #         Note that this will *also* cause applets to take precedence
 344 #         over shell builtins of the same name. So turning this on will
 345 #         eliminate any performance gained by turning on the builtin "echo"
 346 #         and "test" commands in ash.
 347 # untrue?
 348 #         Note that when using this option, the shell will attempt to directly
 349 #         run '/bin/busybox'. If you do not have the busybox binary sitting in
 350 #         that exact location with that exact name, this option will not work at
 351 #         all.
 352
 353 config BUSYBOX_CONFIG_FEATURE_SH_NOFORK
 354         bool "Run 'nofork' applets directly"
 355         default n
 356         depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
 357         help
 358           This option causes busybox shells [currently only ash]
 359           to not execute typical fork/exec/wait sequence, but call <applet>_main
 360           directly, if possible. (Sometimes it is not possible: for example,
 361           this is not possible in pipes).
 362
 363           This will be done only for some applets (those which are marked
 364           NOFORK in include/applets.h).
 365
 366           This may significantly speed up some shell scripts.
 367
 368           This feature is relatively new. Use with care.
 369
 370 config BUSYBOX_CONFIG_CTTYHACK
 371         bool "cttyhack"
 372         default n
 373         help
 374           One common problem reported on the mailing list is "can't access tty;
 375           job control turned off" error message which typically appears when
 376           one tries to use shell with stdin/stdout opened to /dev/console.
 377           This device is special - it cannot be a controlling tty.
 378
 379           Proper solution is to use correct device instead of /dev/console.
 380
 381           cttyhack provides "quick and dirty" solution to this problem.
 382           It analyzes stdin with various ioctls, trying to determine whether
 383           it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
 384           If it detects one, it closes stdin/out/err and reopens that device.
 385           Then it executes given program. Opening the device will make
 386           that device a controlling tty. This may require cttyhack
 387           to be a session leader.
 388
 389           Example for /etc/inittab (for busybox init):
 390
 391           ::respawn:/bin/cttyhack /bin/sh
 392
 393           Giving controlling tty to shell running with PID 1:
 394
 395           $ exec cttyhack sh
 396
 397           Starting an interactive shell from boot shell script:
 398
 399           setsid cttyhack sh
 400
 401 endmenu