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 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 BUSYBOX_CONFIG_FEATURE_SH_IS_MSH
  28         select BUSYBOX_CONFIG_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 comment "Ash Shell Options"
  47         depends on BUSYBOX_CONFIG_ASH
  48
  49 config BUSYBOX_CONFIG_ASH_BASH_COMPAT
  50         bool "bash-compatible extensions"
  51         default y
  52         depends on BUSYBOX_CONFIG_ASH
  53         help
  54           Enable bash-conpatible extensions.
  55
  56 config BUSYBOX_CONFIG_ASH_JOB_CONTROL
  57         bool "Job control"
  58         default y
  59         depends on BUSYBOX_CONFIG_ASH
  60         help
  61           Enable job control in the ash shell.
  62
  63 config BUSYBOX_CONFIG_ASH_READ_NCHARS
  64         bool "'read -n N' and 'read -s' support"
  65         default n
  66         depends on BUSYBOX_CONFIG_ASH
  67         help
  68           'read -n N' will return a value after N characters have been read.
  69           'read -s' will read without echoing the user's input.
  70
  71 config BUSYBOX_CONFIG_ASH_READ_TIMEOUT
  72         bool "'read -t S' support."
  73         default y
  74         depends on BUSYBOX_CONFIG_ASH
  75         help
  76           'read -t S' will return a value after S seconds have passed.
  77           This implementation will allow fractional seconds, expressed
  78           as a decimal fraction, e.g. 'read -t 2.5 foo'.
  79
  80 config BUSYBOX_CONFIG_ASH_ALIAS
  81         bool "alias support"
  82         default y
  83         depends on BUSYBOX_CONFIG_ASH
  84         help
  85           Enable alias support in the ash shell.
  86
  87 config BUSYBOX_CONFIG_ASH_MATH_SUPPORT
  88         bool "Posix math support"
  89         default y
  90         depends on BUSYBOX_CONFIG_ASH
  91         help
  92           Enable math support in the ash shell.
  93
  94 config BUSYBOX_CONFIG_ASH_MATH_SUPPORT_64
  95         bool "Extend Posix math support to 64 bit"
  96         default y
  97         depends on BUSYBOX_CONFIG_ASH_MATH_SUPPORT
  98         help
  99           Enable 64-bit math support in the ash shell.  This will make
 100           the shell slightly larger, but will allow computation with very
 101           large numbers.
 102
 103 config BUSYBOX_CONFIG_ASH_GETOPTS
 104         bool "Builtin getopt to parse positional parameters"
 105         default y
 106         depends on BUSYBOX_CONFIG_ASH
 107         help
 108           Enable getopts builtin in the ash shell.
 109
 110 config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO
 111         bool "Builtin version of 'echo'"
 112         default y
 113         depends on BUSYBOX_CONFIG_ASH
 114         help
 115           Enable support for echo, builtin to ash.
 116
 117 config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF
 118         bool "Builtin version of 'printf'"
 119         default y
 120         depends on BUSYBOX_CONFIG_ASH
 121         help
 122           Enable support for printf, builtin to ash.
 123
 124 config BUSYBOX_CONFIG_ASH_BUILTIN_TEST
 125         bool "Builtin version of 'test'"
 126         default y
 127         depends on BUSYBOX_CONFIG_ASH
 128         help
 129           Enable support for test, builtin to ash.
 130
 131 config BUSYBOX_CONFIG_ASH_CMDCMD
 132         bool "'command' command to override shell builtins"
 133         default y
 134         depends on BUSYBOX_CONFIG_ASH
 135         help
 136           Enable support for the ash 'command' builtin, which allows
 137           you to run the specified command with the specified arguments,
 138           even when there is an ash builtin command with the same name.
 139
 140 config BUSYBOX_CONFIG_ASH_MAIL
 141         bool "Check for new mail on interactive shells"
 142         default n
 143         depends on BUSYBOX_CONFIG_ASH
 144         help
 145           Enable "check for new mail" in the ash shell.
 146
 147 config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE
 148         bool "Optimize for size instead of speed"
 149         default n
 150         depends on BUSYBOX_CONFIG_ASH
 151         help
 152           Compile ash for reduced size at the price of speed.
 153
 154 config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT
 155         bool "Pseudorandom generator and variable $RANDOM"
 156         default n
 157         depends on BUSYBOX_CONFIG_ASH
 158         help
 159           Enable pseudorandom generator and dynamic variable "$RANDOM".
 160           Each read of "$RANDOM" will generate a new pseudorandom value.
 161           You can reset the generator by using a specified start value.
 162           After "unset RANDOM" then generator will switch off and this
 163           variable will no longer have special treatment.
 164
 165 config BUSYBOX_CONFIG_ASH_EXPAND_PRMT
 166         bool "Expand prompt string"
 167         default y
 168         depends on BUSYBOX_CONFIG_ASH
 169         help
 170           "PS#" may be contain volatile content, such as backquote commands.
 171           This option recreates the prompt string from the environment
 172           variable each time it is displayed.
 173
 174 config BUSYBOX_CONFIG_HUSH
 175         bool "hush"
 176         default n
 177         help
 178           hush is a very small shell (just 18k) and it has fairly complete
 179           Bourne shell grammar.  It even handles all the normal flow control
 180           options such as if/then/elif/else/fi, for/in/do/done, while loops,
 181           etc.
 182
 183           It does not handle case/esac, select, function, here documents ( <<
 184           word ), arithmetic expansion, aliases, brace expansion, tilde
 185           expansion, &> and >& redirection of stdout+stderr, etc.
 186
 187 config BUSYBOX_CONFIG_HUSH_HELP
 188         bool "help builtin"
 189         default n
 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 n
 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 the file.
 202           No prompt, no PS1/PS2 magic shell variables.
 203
 204 config BUSYBOX_CONFIG_HUSH_JOB
 205         bool "Job control"
 206         default n
 207         depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE
 208         help
 209           Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
 210           command (not entire shell), fg/bg builtins work. Without this option,
 211           "cmd &" still works by simply spawning a process and immediately
 212           prompting for next command (or executing next command in a script),
 213           but no separate process group is formed.
 214
 215 config BUSYBOX_CONFIG_HUSH_TICK
 216         bool "Process substitution"
 217         default n
 218         depends on BUSYBOX_CONFIG_HUSH
 219         help
 220           Enable process substitution `command` and $(command) in hush.
 221
 222 config BUSYBOX_CONFIG_HUSH_IF
 223         bool "Support if/then/elif/else/fi"
 224         default n
 225         depends on BUSYBOX_CONFIG_HUSH
 226         help
 227           Enable if/then/elif/else/fi in hush.
 228
 229 config BUSYBOX_CONFIG_HUSH_LOOPS
 230         bool "Support for, while and until loops"
 231         default n
 232         depends on BUSYBOX_CONFIG_HUSH
 233         help
 234           Enable for, while and until loops in hush.
 235
 236 config BUSYBOX_CONFIG_LASH
 237         bool "lash"
 238         default n
 239         select BUSYBOX_CONFIG_HUSH
 240         help
 241           lash is deprecated and will be removed, please migrate to hush.
 242
 243 config BUSYBOX_CONFIG_MSH
 244         bool "msh"
 245         default n
 246         help
 247           The minix shell (adds just 30k) is quite complete and handles things
 248           like for/do/done, case/esac and all the things you expect a Bourne
 249           shell to do.  It is not always pedantically correct about Bourne
 250           shell grammar (try running the shell testscript "tests/sh.testcases"
 251           on it and compare vs bash) but for most things it works quite well.
 252           It also uses only vfork, so it can be used on uClinux systems.
 253
 254 comment "Bourne Shell Options"
 255         depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
 256
 257 config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET
 258         bool "Hide message on interactive shell startup"
 259         default n
 260         depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
 261         help
 262           Remove the busybox introduction when starting a shell.
 263
 264 config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE
 265         bool "Standalone shell"
 266         default n
 267         depends on (BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
 268         help
 269           This option causes busybox shells to use busybox applets
 270           in preference to executables in the PATH whenever possible.  For
 271           example, entering the command 'ifconfig' into the shell would cause
 272           busybox to use the ifconfig busybox applet.  Specifying the fully
 273           qualified executable name, such as '/sbin/ifconfig' will still
 274           execute the /sbin/ifconfig executable on the filesystem.  This option
 275           is generally used when creating a statically linked version of busybox
 276           for use as a rescue shell, in the event that you screw up your system.
 277
 278           This is implemented by re-execing /proc/self/exe (typically)
 279           with right parameters. Some selected applets ("NOFORK" applets)
 280           can even be executed without creating new process.
 281           Instead, busybox will call <applet>_main() internally.
 282
 283           However, this causes problems in chroot jails without mounted /proc
 284           and with ps/top (command name can be shown as 'exe' for applets
 285           started this way).
 286 # untrue?
 287 #         Note that this will *also* cause applets to take precedence
 288 #         over shell builtins of the same name.  So turning this on will
 289 #         eliminate any performance gained by turning on the builtin "echo"
 290 #         and "test" commands in ash.
 291 # untrue?
 292 #         Note that when using this option, the shell will attempt to directly
 293 #         run '/bin/busybox'.  If you do not have the busybox binary sitting in
 294 #         that exact location with that exact name, this option will not work at
 295 #         all.
 296
 297 config BUSYBOX_CONFIG_FEATURE_SH_NOFORK
 298         bool "Run 'nofork' applets directly"
 299         default n
 300         depends on (BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
 301         help
 302           This option causes busybox shells [currently only ash]
 303           to not execute typical fork/exec/wait sequence, but call <applet>_main
 304           directly, if possible. (Sometimes it is not possible: for example,
 305           this is not possible in pipes).
 306
 307           This will be done only for some applets (those which are marked
 308           NOFORK in include/applets.h).
 309
 310           This may significantly speed up some shell scripts.
 311
 312           This feature is relatively new. Use with care.
 313
 314 config BUSYBOX_CONFIG_CTTYHACK
 315         bool "cttyhack"
 316         default n
 317         help
 318           One common problem reported on the mailing list is "can't access tty;
 319           job control turned off" error message which typically appears when
 320           one tries to use shell with stdin/stdout opened to /dev/console.
 321           This device is special - it cannot be a controlling tty.
 322
 323           Proper solution is to use correct device instead of /dev/console.
 324
 325           cttyhack provides "quick and dirty" solution to this problem.
 326           It analyzes stdin with various ioctls, trying to determine whether
 327           it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
 328           If it detects one, it closes stdin/out/err and reopens that device.
 329           Then it executes given program. Usage example for /etc/inittab
 330           (for busybox init):
 331
 332           ::respawn:/bin/cttyhack /bin/sh
 333
 334 endmenu