| 1 | # DO NOT EDIT. This file is generated from Config.src |
| 2 | # |
| 3 | # For a description of the syntax of this configuration file, |
| 4 | # see scripts/kbuild/config-language.txt. |
| 5 | # |
| 6 | |
| 7 | menu "Shells" |
| 8 | |
| 9 | config BUSYBOX_CONFIG_ASH |
| 10 | bool "ash" |
| 11 | default y |
| 12 | depends on !BUSYBOX_CONFIG_NOMMU |
| 13 | help |
| 14 | Tha 'ash' shell adds about 60k in the default configuration and is |
| 15 | the most complete and most pedantically correct shell included with |
| 16 | busybox. This shell is actually a derivative of the Debian 'dash' |
| 17 | shell (by Herbert Xu), which was created by porting the 'ash' shell |
| 18 | (written by Kenneth Almquist) from NetBSD. |
| 19 | |
| 20 | config BUSYBOX_CONFIG_ASH_BASH_COMPAT |
| 21 | bool "bash-compatible extensions" |
| 22 | default y |
| 23 | depends on BUSYBOX_CONFIG_ASH |
| 24 | help |
| 25 | Enable bash-compatible extensions. |
| 26 | |
| 27 | config BUSYBOX_CONFIG_ASH_IDLE_TIMEOUT |
| 28 | bool "Idle timeout variable" |
| 29 | default n |
| 30 | depends on BUSYBOX_CONFIG_ASH |
| 31 | help |
| 32 | Enables bash-like auto-logout after $TMOUT seconds of idle time. |
| 33 | |
| 34 | config BUSYBOX_CONFIG_ASH_JOB_CONTROL |
| 35 | bool "Job control" |
| 36 | default y |
| 37 | depends on BUSYBOX_CONFIG_ASH |
| 38 | help |
| 39 | Enable job control in the ash shell. |
| 40 | |
| 41 | config BUSYBOX_CONFIG_ASH_ALIAS |
| 42 | bool "Alias support" |
| 43 | default y |
| 44 | depends on BUSYBOX_CONFIG_ASH |
| 45 | help |
| 46 | Enable alias support in the ash shell. |
| 47 | |
| 48 | config BUSYBOX_CONFIG_ASH_GETOPTS |
| 49 | bool "Builtin getopt to parse positional parameters" |
| 50 | default y |
| 51 | depends on BUSYBOX_CONFIG_ASH |
| 52 | help |
| 53 | Enable support for getopts builtin in ash. |
| 54 | |
| 55 | config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO |
| 56 | bool "Builtin version of 'echo'" |
| 57 | default y |
| 58 | depends on BUSYBOX_CONFIG_ASH |
| 59 | help |
| 60 | Enable support for echo builtin in ash. |
| 61 | |
| 62 | config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF |
| 63 | bool "Builtin version of 'printf'" |
| 64 | default y |
| 65 | depends on BUSYBOX_CONFIG_ASH |
| 66 | help |
| 67 | Enable support for printf builtin in ash. |
| 68 | |
| 69 | config BUSYBOX_CONFIG_ASH_BUILTIN_TEST |
| 70 | bool "Builtin version of 'test'" |
| 71 | default y |
| 72 | depends on BUSYBOX_CONFIG_ASH |
| 73 | help |
| 74 | Enable support for test builtin in ash. |
| 75 | |
| 76 | config BUSYBOX_CONFIG_ASH_CMDCMD |
| 77 | bool "'command' command to override shell builtins" |
| 78 | default y |
| 79 | depends on BUSYBOX_CONFIG_ASH |
| 80 | help |
| 81 | Enable support for the ash 'command' builtin, which allows |
| 82 | you to run the specified command with the specified arguments, |
| 83 | even when there is an ash builtin command with the same name. |
| 84 | |
| 85 | config BUSYBOX_CONFIG_ASH_MAIL |
| 86 | bool "Check for new mail on interactive shells" |
| 87 | default n |
| 88 | depends on BUSYBOX_CONFIG_ASH |
| 89 | help |
| 90 | Enable "check for new mail" function in the ash shell. |
| 91 | |
| 92 | config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE |
| 93 | bool "Optimize for size instead of speed" |
| 94 | default n |
| 95 | depends on BUSYBOX_CONFIG_ASH |
| 96 | help |
| 97 | Compile ash for reduced size at the price of speed. |
| 98 | |
| 99 | config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT |
| 100 | bool "Pseudorandom generator and $RANDOM variable" |
| 101 | default n |
| 102 | depends on BUSYBOX_CONFIG_ASH |
| 103 | help |
| 104 | Enable pseudorandom generator and dynamic variable "$RANDOM". |
| 105 | Each read of "$RANDOM" will generate a new pseudorandom value. |
| 106 | You can reset the generator by using a specified start value. |
| 107 | After "unset RANDOM" the generator will switch off and this |
| 108 | variable will no longer have special treatment. |
| 109 | |
| 110 | config BUSYBOX_CONFIG_ASH_EXPAND_PRMT |
| 111 | bool "Expand prompt string" |
| 112 | default y |
| 113 | depends on BUSYBOX_CONFIG_ASH |
| 114 | help |
| 115 | "PS#" may contain volatile content, such as backquote commands. |
| 116 | This option recreates the prompt string from the environment |
| 117 | variable each time it is displayed. |
| 118 | |
| 119 | config BUSYBOX_CONFIG_CTTYHACK |
| 120 | bool "cttyhack" |
| 121 | default n |
| 122 | help |
| 123 | One common problem reported on the mailing list is the "can't |
| 124 | access tty; job control turned off" error message, which typically |
| 125 | appears when one tries to use a shell with stdin/stdout on |
| 126 | /dev/console. |
| 127 | This device is special - it cannot be a controlling tty. |
| 128 | |
| 129 | The proper solution is to use the correct device instead of |
| 130 | /dev/console. |
| 131 | |
| 132 | cttyhack provides a "quick and dirty" solution to this problem. |
| 133 | It analyzes stdin with various ioctls, trying to determine whether |
| 134 | it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line). |
| 135 | On Linux it also checks sysfs for a pointer to the active console. |
| 136 | If cttyhack is able to find the real console device, it closes |
| 137 | stdin/out/err and reopens that device. |
| 138 | Then it executes the given program. Opening the device will make |
| 139 | that device a controlling tty. This may require cttyhack |
| 140 | to be a session leader. |
| 141 | |
| 142 | Example for /etc/inittab (for busybox init): |
| 143 | |
| 144 | ::respawn:/bin/cttyhack /bin/sh |
| 145 | |
| 146 | Starting an interactive shell from boot shell script: |
| 147 | |
| 148 | setsid cttyhack sh |
| 149 | |
| 150 | Giving controlling tty to shell running with PID 1: |
| 151 | |
| 152 | # exec cttyhack sh |
| 153 | |
| 154 | Without cttyhack, you need to know exact tty name, |
| 155 | and do something like this: |
| 156 | |
| 157 | # exec setsid sh -c 'exec sh </dev/tty1 >/dev/tty1 2>&1' |
| 158 | |
| 159 | config BUSYBOX_CONFIG_HUSH |
| 160 | bool "hush" |
| 161 | default n |
| 162 | help |
| 163 | hush is a small shell (25k). It handles the normal flow control |
| 164 | constructs such as if/then/elif/else/fi, for/in/do/done, while loops, |
| 165 | case/esac. Redirections, here documents, $((arithmetic)) |
| 166 | and functions are supported. |
| 167 | |
| 168 | It will compile and work on no-mmu systems. |
| 169 | |
| 170 | It does not handle select, aliases, tilde expansion, |
| 171 | &>file and >&file redirection of stdout+stderr. |
| 172 | |
| 173 | config BUSYBOX_CONFIG_HUSH_BASH_COMPAT |
| 174 | bool "bash-compatible extensions" |
| 175 | default y |
| 176 | depends on BUSYBOX_CONFIG_HUSH |
| 177 | help |
| 178 | Enable bash-compatible extensions. |
| 179 | |
| 180 | config BUSYBOX_CONFIG_HUSH_BRACE_EXPANSION |
| 181 | bool "Brace expansion" |
| 182 | default n |
| 183 | depends on BUSYBOX_CONFIG_HUSH_BASH_COMPAT |
| 184 | help |
| 185 | Enable {abc,def} extension. |
| 186 | |
| 187 | config BUSYBOX_CONFIG_HUSH_HELP |
| 188 | bool "help builtin" |
| 189 | default y |
| 190 | depends on BUSYBOX_CONFIG_HUSH |
| 191 | help |
| 192 | Enable help builtin in hush. Code size + ~1 kbyte. |
| 193 | |
| 194 | config BUSYBOX_CONFIG_HUSH_INTERACTIVE |
| 195 | bool "Interactive mode" |
| 196 | default y |
| 197 | depends on BUSYBOX_CONFIG_HUSH |
| 198 | help |
| 199 | Enable interactive mode (prompt and command editing). |
| 200 | Without this, hush simply reads and executes commands |
| 201 | from stdin just like a shell script from a file. |
| 202 | No prompt, no PS1/PS2 magic shell variables. |
| 203 | |
| 204 | config BUSYBOX_CONFIG_HUSH_SAVEHISTORY |
| 205 | bool "Save command history to .hush_history" |
| 206 | default n |
| 207 | depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE && BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY |
| 208 | help |
| 209 | Enable history saving in hush. |
| 210 | |
| 211 | config BUSYBOX_CONFIG_HUSH_JOB |
| 212 | bool "Job control" |
| 213 | default y |
| 214 | depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE |
| 215 | help |
| 216 | Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current |
| 217 | command (not entire shell), fg/bg builtins work. Without this option, |
| 218 | "cmd &" still works by simply spawning a process and immediately |
| 219 | prompting for next command (or executing next command in a script), |
| 220 | but no separate process group is formed. |
| 221 | |
| 222 | config BUSYBOX_CONFIG_HUSH_TICK |
| 223 | bool "Process substitution" |
| 224 | default y |
| 225 | depends on BUSYBOX_CONFIG_HUSH |
| 226 | help |
| 227 | Enable process substitution `command` and $(command) in hush. |
| 228 | |
| 229 | config BUSYBOX_CONFIG_HUSH_IF |
| 230 | bool "Support if/then/elif/else/fi" |
| 231 | default y |
| 232 | depends on BUSYBOX_CONFIG_HUSH |
| 233 | help |
| 234 | Enable if/then/elif/else/fi in hush. |
| 235 | |
| 236 | config BUSYBOX_CONFIG_HUSH_LOOPS |
| 237 | bool "Support for, while and until loops" |
| 238 | default y |
| 239 | depends on BUSYBOX_CONFIG_HUSH |
| 240 | help |
| 241 | Enable for, while and until loops in hush. |
| 242 | |
| 243 | config BUSYBOX_CONFIG_HUSH_CASE |
| 244 | bool "Support case ... esac statement" |
| 245 | default y |
| 246 | depends on BUSYBOX_CONFIG_HUSH |
| 247 | help |
| 248 | Enable case ... esac statement in hush. +400 bytes. |
| 249 | |
| 250 | config BUSYBOX_CONFIG_HUSH_FUNCTIONS |
| 251 | bool "Support funcname() { commands; } syntax" |
| 252 | default y |
| 253 | depends on BUSYBOX_CONFIG_HUSH |
| 254 | help |
| 255 | Enable support for shell functions in hush. +800 bytes. |
| 256 | |
| 257 | config BUSYBOX_CONFIG_HUSH_LOCAL |
| 258 | bool "Support local builtin" |
| 259 | default y |
| 260 | depends on BUSYBOX_CONFIG_HUSH_FUNCTIONS |
| 261 | help |
| 262 | Enable support for local variables in functions. |
| 263 | |
| 264 | config BUSYBOX_CONFIG_HUSH_RANDOM_SUPPORT |
| 265 | bool "Pseudorandom generator and $RANDOM variable" |
| 266 | default n |
| 267 | depends on BUSYBOX_CONFIG_HUSH |
| 268 | help |
| 269 | Enable pseudorandom generator and dynamic variable "$RANDOM". |
| 270 | Each read of "$RANDOM" will generate a new pseudorandom value. |
| 271 | |
| 272 | config BUSYBOX_CONFIG_HUSH_EXPORT_N |
| 273 | bool "Support 'export -n' option" |
| 274 | default y |
| 275 | depends on BUSYBOX_CONFIG_HUSH |
| 276 | help |
| 277 | export -n unexports variables. It is a bash extension. |
| 278 | |
| 279 | config BUSYBOX_CONFIG_HUSH_MODE_X |
| 280 | bool "Support 'hush -x' option and 'set -x' command" |
| 281 | default n |
| 282 | depends on BUSYBOX_CONFIG_HUSH |
| 283 | help |
| 284 | This instructs hush to print commands before execution. |
| 285 | Adds ~300 bytes. |
| 286 | |
| 287 | config BUSYBOX_CONFIG_MSH |
| 288 | bool "msh (deprecated: aliased to hush)" |
| 289 | default n |
| 290 | select BUSYBOX_CONFIG_HUSH |
| 291 | help |
| 292 | msh is deprecated and will be removed, please migrate to hush. |
| 293 | |
| 294 | |
| 295 | choice |
| 296 | prompt "Choose which shell is aliased to 'sh' name" |
| 297 | default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH |
| 298 | help |
| 299 | Choose which shell you want to be executed by 'sh' alias. |
| 300 | The ash shell is the most bash compatible and full featured one. |
| 301 | |
| 302 | # note: cannot use "select ASH" here, it breaks "make allnoconfig" |
| 303 | config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH |
| 304 | depends on BUSYBOX_CONFIG_ASH |
| 305 | bool "ash" |
| 306 | depends on !BUSYBOX_CONFIG_NOMMU |
| 307 | |
| 308 | config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH |
| 309 | depends on BUSYBOX_CONFIG_HUSH |
| 310 | bool "hush" |
| 311 | |
| 312 | config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE |
| 313 | bool "none" |
| 314 | |
| 315 | endchoice |
| 316 | |
| 317 | choice |
| 318 | prompt "Choose which shell is aliased to 'bash' name" |
| 319 | default BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE |
| 320 | help |
| 321 | Choose which shell you want to be executed by 'bash' alias. |
| 322 | The ash shell is the most bash compatible and full featured one. |
| 323 | |
| 324 | Note that selecting this option does not switch on any bash |
| 325 | compatibility code. It merely makes it possible to install |
| 326 | /bin/bash (sym)link and run scripts which start with |
| 327 | #!/bin/bash line. |
| 328 | |
| 329 | Many systems use it in scripts which use bash-specific features, |
| 330 | even simple ones like $RANDOM. Without this option, busybox |
| 331 | can't be used for running them because it won't recongnize |
| 332 | "bash" as a supported applet name. |
| 333 | |
| 334 | config BUSYBOX_CONFIG_FEATURE_BASH_IS_ASH |
| 335 | depends on BUSYBOX_CONFIG_ASH |
| 336 | bool "ash" |
| 337 | depends on !BUSYBOX_CONFIG_NOMMU |
| 338 | |
| 339 | config BUSYBOX_CONFIG_FEATURE_BASH_IS_HUSH |
| 340 | depends on BUSYBOX_CONFIG_HUSH |
| 341 | bool "hush" |
| 342 | |
| 343 | config BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE |
| 344 | bool "none" |
| 345 | |
| 346 | endchoice |
| 347 | |
| 348 | |
| 349 | config BUSYBOX_CONFIG_SH_MATH_SUPPORT |
| 350 | bool "POSIX math support" |
| 351 | default y |
| 352 | depends on BUSYBOX_CONFIG_ASH || BUSYBOX_CONFIG_HUSH |
| 353 | help |
| 354 | Enable math support in the shell via $((...)) syntax. |
| 355 | |
| 356 | config BUSYBOX_CONFIG_SH_MATH_SUPPORT_64 |
| 357 | bool "Extend POSIX math support to 64 bit" |
| 358 | default y |
| 359 | depends on BUSYBOX_CONFIG_SH_MATH_SUPPORT |
| 360 | help |
| 361 | Enable 64-bit math support in the shell. This will make the shell |
| 362 | slightly larger, but will allow computation with very large numbers. |
| 363 | This is not in POSIX, so do not rely on this in portable code. |
| 364 | |
| 365 | config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET |
| 366 | bool "Hide message on interactive shell startup" |
| 367 | default n |
| 368 | depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH |
| 369 | help |
| 370 | Remove the busybox introduction when starting a shell. |
| 371 | |
| 372 | config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE |
| 373 | bool "Standalone shell" |
| 374 | default n |
| 375 | depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS |
| 376 | help |
| 377 | This option causes busybox shells to use busybox applets |
| 378 | in preference to executables in the PATH whenever possible. For |
| 379 | example, entering the command 'ifconfig' into the shell would cause |
| 380 | busybox to use the ifconfig busybox applet. Specifying the fully |
| 381 | qualified executable name, such as '/sbin/ifconfig' will still |
| 382 | execute the /sbin/ifconfig executable on the filesystem. This option |
| 383 | is generally used when creating a statically linked version of busybox |
| 384 | for use as a rescue shell, in the event that you screw up your system. |
| 385 | |
| 386 | This is implemented by re-execing /proc/self/exe (typically) |
| 387 | with right parameters. Some selected applets ("NOFORK" applets) |
| 388 | can even be executed without creating new process. |
| 389 | Instead, busybox will call <applet>_main() internally. |
| 390 | |
| 391 | However, this causes problems in chroot jails without mounted /proc |
| 392 | and with ps/top (command name can be shown as 'exe' for applets |
| 393 | started this way). |
| 394 | # untrue? |
| 395 | # Note that this will *also* cause applets to take precedence |
| 396 | # over shell builtins of the same name. So turning this on will |
| 397 | # eliminate any performance gained by turning on the builtin "echo" |
| 398 | # and "test" commands in ash. |
| 399 | # untrue? |
| 400 | # Note that when using this option, the shell will attempt to directly |
| 401 | # run '/bin/busybox'. If you do not have the busybox binary sitting in |
| 402 | # that exact location with that exact name, this option will not work at |
| 403 | # all. |
| 404 | |
| 405 | config BUSYBOX_CONFIG_FEATURE_SH_NOFORK |
| 406 | bool "Run 'nofork' applets directly" |
| 407 | default n |
| 408 | depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS |
| 409 | help |
| 410 | This option causes busybox shells to not execute typical |
| 411 | fork/exec/wait sequence, but call <applet>_main directly, |
| 412 | if possible. (Sometimes it is not possible: for example, |
| 413 | this is not possible in pipes). |
| 414 | |
| 415 | This will be done only for some applets (those which are marked |
| 416 | NOFORK in include/applets.h). |
| 417 | |
| 418 | This may significantly speed up some shell scripts. |
| 419 | |
| 420 | This feature is relatively new. Use with care. Report bugs |
| 421 | to project mailing list. |
| 422 | |
| 423 | config BUSYBOX_CONFIG_FEATURE_SH_HISTFILESIZE |
| 424 | bool "Use $HISTFILESIZE" |
| 425 | default n |
| 426 | depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH |
| 427 | help |
| 428 | This option makes busybox shells to use $HISTFILESIZE variable |
| 429 | to set shell history size. Note that its max value is capped |
| 430 | by "History size" setting in library tuning section. |
| 431 | |
| 432 | |
| 433 | endmenu |
| 434 | |
