| 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 | choice |
| 9 | prompt "Choose your default shell" |
| 10 | default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH |
| 11 | help |
| 12 | Choose a shell. The ash shell is the most bash compatible |
| 13 | and full featured one. |
| 14 | |
| 15 | config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH |
| 16 | select BUSYBOX_CONFIG_ASH |
| 17 | bool "ash" |
| 18 | |
| 19 | config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH |
| 20 | select BUSYBOX_CONFIG_HUSH |
| 21 | bool "hush" |
| 22 | |
| 23 | ####config FEATURE_SH_IS_LASH |
| 24 | #### select LASH |
| 25 | #### bool "lash" |
| 26 | |
| 27 | ####config FEATURE_SH_IS_MSH |
| 28 | #### select MSH |
| 29 | #### bool "msh" |
| 30 | |
| 31 | config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE |
| 32 | bool "none" |
| 33 | |
| 34 | endchoice |
| 35 | |
| 36 | config BUSYBOX_CONFIG_ASH |
| 37 | bool "ash" |
| 38 | default y |
| 39 | help |
| 40 | Tha 'ash' shell adds about 60k in the default configuration and is |
| 41 | the most complete and most pedantically correct shell included with |
| 42 | busybox. This shell is actually a derivative of the Debian 'dash' |
| 43 | shell (by Herbert Xu), which was created by porting the 'ash' shell |
| 44 | (written by Kenneth Almquist) from NetBSD. |
| 45 | |
| 46 | config BUSYBOX_CONFIG_ASH_BASH_COMPAT |
| 47 | bool "bash-compatible extensions" |
| 48 | default y |
| 49 | depends on BUSYBOX_CONFIG_ASH |
| 50 | help |
| 51 | Enable bash-compatible extensions. |
| 52 | |
| 53 | config BUSYBOX_CONFIG_ASH_JOB_CONTROL |
| 54 | bool "Job control" |
| 55 | default y |
| 56 | depends on BUSYBOX_CONFIG_ASH |
| 57 | help |
| 58 | Enable job control in the ash shell. |
| 59 | |
| 60 | config BUSYBOX_CONFIG_ASH_READ_NCHARS |
| 61 | bool "'read -n N' and 'read -s' support" |
| 62 | default n |
| 63 | depends on BUSYBOX_CONFIG_ASH |
| 64 | help |
| 65 | 'read -n N' will return a value after N characters have been read. |
| 66 | 'read -s' will read without echoing the user's input. |
| 67 | |
| 68 | config BUSYBOX_CONFIG_ASH_READ_TIMEOUT |
| 69 | bool "'read -t S' support" |
| 70 | default y |
| 71 | depends on BUSYBOX_CONFIG_ASH |
| 72 | help |
| 73 | 'read -t S' will return a value after S seconds have passed. |
| 74 | This implementation will allow fractional seconds, expressed |
| 75 | as a decimal fraction, e.g. 'read -t 2.5 foo'. |
| 76 | |
| 77 | config BUSYBOX_CONFIG_ASH_ALIAS |
| 78 | bool "alias support" |
| 79 | default y |
| 80 | depends on BUSYBOX_CONFIG_ASH |
| 81 | help |
| 82 | Enable alias support in the ash shell. |
| 83 | |
| 84 | config BUSYBOX_CONFIG_ASH_GETOPTS |
| 85 | bool "Builtin getopt to parse positional parameters" |
| 86 | default y |
| 87 | depends on BUSYBOX_CONFIG_ASH |
| 88 | help |
| 89 | Enable getopts builtin in the ash shell. |
| 90 | |
| 91 | config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO |
| 92 | bool "Builtin version of 'echo'" |
| 93 | default y |
| 94 | depends on BUSYBOX_CONFIG_ASH |
| 95 | help |
| 96 | Enable support for echo, builtin to ash. |
| 97 | |
| 98 | config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF |
| 99 | bool "Builtin version of 'printf'" |
| 100 | default y |
| 101 | depends on BUSYBOX_CONFIG_ASH |
| 102 | help |
| 103 | Enable support for printf, builtin to ash. |
| 104 | |
| 105 | config BUSYBOX_CONFIG_ASH_BUILTIN_TEST |
| 106 | bool "Builtin version of 'test'" |
| 107 | default y |
| 108 | depends on BUSYBOX_CONFIG_ASH |
| 109 | help |
| 110 | Enable support for test, builtin to ash. |
| 111 | |
| 112 | config BUSYBOX_CONFIG_ASH_CMDCMD |
| 113 | bool "'command' command to override shell builtins" |
| 114 | default y |
| 115 | depends on BUSYBOX_CONFIG_ASH |
| 116 | help |
| 117 | Enable support for the ash 'command' builtin, which allows |
| 118 | you to run the specified command with the specified arguments, |
| 119 | even when there is an ash builtin command with the same name. |
| 120 | |
| 121 | config BUSYBOX_CONFIG_ASH_MAIL |
| 122 | bool "Check for new mail on interactive shells" |
| 123 | default n |
| 124 | depends on BUSYBOX_CONFIG_ASH |
| 125 | help |
| 126 | Enable "check for new mail" in the ash shell. |
| 127 | |
| 128 | config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE |
| 129 | bool "Optimize for size instead of speed" |
| 130 | default n |
| 131 | depends on BUSYBOX_CONFIG_ASH |
| 132 | help |
| 133 | Compile ash for reduced size at the price of speed. |
| 134 | |
| 135 | config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT |
| 136 | bool "Pseudorandom generator and $RANDOM variable" |
| 137 | default n |
| 138 | depends on BUSYBOX_CONFIG_ASH |
| 139 | help |
| 140 | Enable pseudorandom generator and dynamic variable "$RANDOM". |
| 141 | Each read of "$RANDOM" will generate a new pseudorandom value. |
| 142 | You can reset the generator by using a specified start value. |
| 143 | After "unset RANDOM" the generator will switch off and this |
| 144 | variable will no longer have special treatment. |
| 145 | |
| 146 | config BUSYBOX_CONFIG_ASH_EXPAND_PRMT |
| 147 | bool "Expand prompt string" |
| 148 | default y |
| 149 | depends on BUSYBOX_CONFIG_ASH |
| 150 | help |
| 151 | "PS#" may contain volatile content, such as backquote commands. |
| 152 | This option recreates the prompt string from the environment |
| 153 | variable each time it is displayed. |
| 154 | |
| 155 | config BUSYBOX_CONFIG_HUSH |
| 156 | bool "hush" |
| 157 | default n |
| 158 | help |
| 159 | hush is a small shell (22k). It handles the normal flow control |
| 160 | constructs such as if/then/elif/else/fi, for/in/do/done, while loops, |
| 161 | case/esac. Redirections, here documents, $((arithmetic)) |
| 162 | and functions are supported. |
| 163 | |
| 164 | It will compile and work on no-mmu systems. |
| 165 | |
| 166 | It does not handle select, aliases, brace expansion, |
| 167 | tilde expansion, &>file and >&file redirection of stdout+stderr. |
| 168 | |
| 169 | config BUSYBOX_CONFIG_HUSH_BASH_COMPAT |
| 170 | bool "bash-compatible extensions" |
| 171 | default y |
| 172 | depends on BUSYBOX_CONFIG_HUSH |
| 173 | help |
| 174 | Enable bash-compatible extensions. |
| 175 | |
| 176 | config BUSYBOX_CONFIG_HUSH_HELP |
| 177 | bool "help builtin" |
| 178 | default y |
| 179 | depends on BUSYBOX_CONFIG_HUSH |
| 180 | help |
| 181 | Enable help builtin in hush. Code size + ~1 kbyte. |
| 182 | |
| 183 | config BUSYBOX_CONFIG_HUSH_INTERACTIVE |
| 184 | bool "Interactive mode" |
| 185 | default y |
| 186 | depends on BUSYBOX_CONFIG_HUSH |
| 187 | help |
| 188 | Enable interactive mode (prompt and command editing). |
| 189 | Without this, hush simply reads and executes commands |
| 190 | from stdin just like a shell script from the file. |
| 191 | No prompt, no PS1/PS2 magic shell variables. |
| 192 | |
| 193 | config BUSYBOX_CONFIG_HUSH_JOB |
| 194 | bool "Job control" |
| 195 | default y |
| 196 | depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE |
| 197 | help |
| 198 | Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current |
| 199 | command (not entire shell), fg/bg builtins work. Without this option, |
| 200 | "cmd &" still works by simply spawning a process and immediately |
| 201 | prompting for next command (or executing next command in a script), |
| 202 | but no separate process group is formed. |
| 203 | |
| 204 | config BUSYBOX_CONFIG_HUSH_TICK |
| 205 | bool "Process substitution" |
| 206 | default y |
| 207 | depends on BUSYBOX_CONFIG_HUSH |
| 208 | help |
| 209 | Enable process substitution `command` and $(command) in hush. |
| 210 | |
| 211 | config BUSYBOX_CONFIG_HUSH_IF |
| 212 | bool "Support if/then/elif/else/fi" |
| 213 | default y |
| 214 | depends on BUSYBOX_CONFIG_HUSH |
| 215 | help |
| 216 | Enable if/then/elif/else/fi in hush. |
| 217 | |
| 218 | config BUSYBOX_CONFIG_HUSH_LOOPS |
| 219 | bool "Support for, while and until loops" |
| 220 | default y |
| 221 | depends on BUSYBOX_CONFIG_HUSH |
| 222 | help |
| 223 | Enable for, while and until loops in hush. |
| 224 | |
| 225 | config BUSYBOX_CONFIG_HUSH_CASE |
| 226 | bool "Support case ... esac statement" |
| 227 | default y |
| 228 | depends on BUSYBOX_CONFIG_HUSH |
| 229 | help |
| 230 | Enable case ... esac statement in hush. +400 bytes. |
| 231 | |
| 232 | config BUSYBOX_CONFIG_HUSH_FUNCTIONS |
| 233 | bool "Support funcname() { commands; } syntax" |
| 234 | default y |
| 235 | depends on BUSYBOX_CONFIG_HUSH |
| 236 | help |
| 237 | Enable support for shell functions in hush. +800 bytes. |
| 238 | |
| 239 | config BUSYBOX_CONFIG_HUSH_LOCAL |
| 240 | bool "Support local builtin" |
| 241 | default y |
| 242 | depends on BUSYBOX_CONFIG_HUSH_FUNCTIONS |
| 243 | help |
| 244 | Enable support for local variables in functions. |
| 245 | |
| 246 | config BUSYBOX_CONFIG_HUSH_EXPORT_N |
| 247 | bool "Support export '-n' option" |
| 248 | default y |
| 249 | depends on BUSYBOX_CONFIG_HUSH |
| 250 | help |
| 251 | Enable support for export '-n' option in hush. It is a bash extension. |
| 252 | |
| 253 | config BUSYBOX_CONFIG_LASH |
| 254 | bool "lash (deprecated: aliased to hush)" |
| 255 | default n |
| 256 | select BUSYBOX_CONFIG_HUSH |
| 257 | help |
| 258 | lash is deprecated and will be removed, please migrate to hush. |
| 259 | |
| 260 | config BUSYBOX_CONFIG_MSH |
| 261 | bool "msh (deprecated: please use hush)" |
| 262 | default n |
| 263 | select BUSYBOX_CONFIG_HUSH |
| 264 | help |
| 265 | msh is deprecated and will be removed, please migrate to hush. |
| 266 | If there is a feature msh has but hush does not, please let us know. |
| 267 | |
| 268 | # The minix shell (adds just 30k) is quite complete and handles things |
| 269 | # like for/do/done, case/esac and all the things you expect a Bourne |
| 270 | # shell to do. It is not always pedantically correct about Bourne |
| 271 | # shell grammar (try running the shell testscript "tests/sh.testcases" |
| 272 | # on it and compare vs bash) but for most things it works quite well. |
| 273 | # It uses only vfork, so it can be used on uClinux systems. |
| 274 | |
| 275 | |
| 276 | config BUSYBOX_CONFIG_SH_MATH_SUPPORT |
| 277 | bool "POSIX math support" |
| 278 | default y |
| 279 | depends on BUSYBOX_CONFIG_ASH || BUSYBOX_CONFIG_HUSH |
| 280 | help |
| 281 | Enable math support in the shell via $((...)) syntax. |
| 282 | |
| 283 | config BUSYBOX_CONFIG_SH_MATH_SUPPORT_64 |
| 284 | bool "Extend POSIX math support to 64 bit" |
| 285 | default y |
| 286 | depends on BUSYBOX_CONFIG_SH_MATH_SUPPORT |
| 287 | help |
| 288 | Enable 64-bit math support in the shell. This will make the shell |
| 289 | slightly larger, but will allow computation with very large numbers. |
| 290 | This is not in POSIX, so do not rely on this in portable code. |
| 291 | |
| 292 | config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET |
| 293 | bool "Hide message on interactive shell startup" |
| 294 | default n |
| 295 | depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH |
| 296 | help |
| 297 | Remove the busybox introduction when starting a shell. |
| 298 | |
| 299 | config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE |
| 300 | bool "Standalone shell" |
| 301 | default n |
| 302 | depends on (BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS |
| 303 | help |
| 304 | This option causes busybox shells to use busybox applets |
| 305 | in preference to executables in the PATH whenever possible. For |
| 306 | example, entering the command 'ifconfig' into the shell would cause |
| 307 | busybox to use the ifconfig busybox applet. Specifying the fully |
| 308 | qualified executable name, such as '/sbin/ifconfig' will still |
| 309 | execute the /sbin/ifconfig executable on the filesystem. This option |
| 310 | is generally used when creating a statically linked version of busybox |
| 311 | for use as a rescue shell, in the event that you screw up your system. |
| 312 | |
| 313 | This is implemented by re-execing /proc/self/exe (typically) |
| 314 | with right parameters. Some selected applets ("NOFORK" applets) |
| 315 | can even be executed without creating new process. |
| 316 | Instead, busybox will call <applet>_main() internally. |
| 317 | |
| 318 | However, this causes problems in chroot jails without mounted /proc |
| 319 | and with ps/top (command name can be shown as 'exe' for applets |
| 320 | started this way). |
| 321 | # untrue? |
| 322 | # Note that this will *also* cause applets to take precedence |
| 323 | # over shell builtins of the same name. So turning this on will |
| 324 | # eliminate any performance gained by turning on the builtin "echo" |
| 325 | # and "test" commands in ash. |
| 326 | # untrue? |
| 327 | # Note that when using this option, the shell will attempt to directly |
| 328 | # run '/bin/busybox'. If you do not have the busybox binary sitting in |
| 329 | # that exact location with that exact name, this option will not work at |
| 330 | # all. |
| 331 | |
| 332 | config BUSYBOX_CONFIG_FEATURE_SH_NOFORK |
| 333 | bool "Run 'nofork' applets directly" |
| 334 | default n |
| 335 | depends on (BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS |
| 336 | help |
| 337 | This option causes busybox shells [currently only ash] |
| 338 | to not execute typical fork/exec/wait sequence, but call <applet>_main |
| 339 | directly, if possible. (Sometimes it is not possible: for example, |
| 340 | this is not possible in pipes). |
| 341 | |
| 342 | This will be done only for some applets (those which are marked |
| 343 | NOFORK in include/applets.h). |
| 344 | |
| 345 | This may significantly speed up some shell scripts. |
| 346 | |
| 347 | This feature is relatively new. Use with care. |
| 348 | |
| 349 | config BUSYBOX_CONFIG_CTTYHACK |
| 350 | bool "cttyhack" |
| 351 | default n |
| 352 | help |
| 353 | One common problem reported on the mailing list is "can't access tty; |
| 354 | job control turned off" error message which typically appears when |
| 355 | one tries to use shell with stdin/stdout opened to /dev/console. |
| 356 | This device is special - it cannot be a controlling tty. |
| 357 | |
| 358 | Proper solution is to use correct device instead of /dev/console. |
| 359 | |
| 360 | cttyhack provides "quick and dirty" solution to this problem. |
| 361 | It analyzes stdin with various ioctls, trying to determine whether |
| 362 | it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line). |
| 363 | If it detects one, it closes stdin/out/err and reopens that device. |
| 364 | Then it executes given program. Usage example for /etc/inittab |
| 365 | (for busybox init): |
| 366 | |
| 367 | ::respawn:/bin/cttyhack /bin/sh |
| 368 | |
| 369 | endmenu |
| 370 | |
