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Diffstat (limited to 'shell/Config.src')
| -rw-r--r-- | shell/Config.src | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/shell/Config.src b/shell/Config.src new file mode 100644 index 0000000..286a341 --- /dev/null +++ b/shell/Config.src @@ -0,0 +1,396 @@ +# +# For a description of the syntax of this configuration file, +# see scripts/kbuild/config-language.txt. +# + +menu "Shells" + +choice + prompt "Choose which shell is aliased to 'sh' name" + default FEATURE_SH_IS_NONE + help + Choose which shell you want to be executed by 'sh' alias. + The ash shell is the most bash compatible and full featured one. + +config FEATURE_SH_IS_ASH + select ASH + bool "ash" + depends on !NOMMU + +config FEATURE_SH_IS_HUSH + select HUSH + bool "hush" + +config FEATURE_SH_IS_NONE + bool "none" + +endchoice + +choice + prompt "Choose which shell is aliased to 'bash' name" + default FEATURE_BASH_IS_NONE + help + Choose which shell you want to be executed by 'bash' alias. + The ash shell is the most bash compatible and full featured one. + + Note that selecting this option does not switch on any bash + compatibility code. It merely makes it possible to install + /bin/bash (sym)link and run scripts which start with + #!/bin/bash line. + + Many systems use it in scripts which use bash-specific features, + even simple ones like $RANDOM. Without this option, busybox + can't be used for running them because it won't recongnize + "bash" as a supported applet name. + +config FEATURE_BASH_IS_ASH + select ASH + bool "ash" + depends on !NOMMU + +config FEATURE_BASH_IS_HUSH + select HUSH + bool "hush" + +config FEATURE_BASH_IS_NONE + bool "none" + +endchoice + +config ASH + bool "ash" + default n + depends on !NOMMU + help + Tha 'ash' shell adds about 60k in the default configuration and is + the most complete and most pedantically correct shell included with + busybox. This shell is actually a derivative of the Debian 'dash' + shell (by Herbert Xu), which was created by porting the 'ash' shell + (written by Kenneth Almquist) from NetBSD. + +config ASH_BASH_COMPAT + bool "bash-compatible extensions" + default y + depends on ASH + help + Enable bash-compatible extensions. + +config ASH_JOB_CONTROL + bool "Job control" + default y + depends on ASH + help + Enable job control in the ash shell. + +config ASH_ALIAS + bool "alias support" + default y + depends on ASH + help + Enable alias support in the ash shell. + +config ASH_GETOPTS + bool "Builtin getopt to parse positional parameters" + default n + depends on ASH + help + Enable getopts builtin in the ash shell. + +config ASH_BUILTIN_ECHO + bool "Builtin version of 'echo'" + default y + depends on ASH + help + Enable support for echo, builtin to ash. + +config ASH_BUILTIN_PRINTF + bool "Builtin version of 'printf'" + default y + depends on ASH + help + Enable support for printf, builtin to ash. + +config ASH_BUILTIN_TEST + bool "Builtin version of 'test'" + default y + depends on ASH + help + Enable support for test, builtin to ash. + +config ASH_CMDCMD + bool "'command' command to override shell builtins" + default n + depends on ASH + help + Enable support for the ash 'command' builtin, which allows + you to run the specified command with the specified arguments, + even when there is an ash builtin command with the same name. + +config ASH_MAIL + bool "Check for new mail on interactive shells" + default y + depends on ASH + help + Enable "check for new mail" in the ash shell. + +config ASH_OPTIMIZE_FOR_SIZE + bool "Optimize for size instead of speed" + default y + depends on ASH + help + Compile ash for reduced size at the price of speed. + +config ASH_RANDOM_SUPPORT + bool "Pseudorandom generator and $RANDOM variable" + default n + depends on ASH + help + Enable pseudorandom generator and dynamic variable "$RANDOM". + Each read of "$RANDOM" will generate a new pseudorandom value. + You can reset the generator by using a specified start value. + After "unset RANDOM" the generator will switch off and this + variable will no longer have special treatment. + +config ASH_EXPAND_PRMT + bool "Expand prompt string" + default n + depends on ASH + help + "PS#" may contain volatile content, such as backquote commands. + This option recreates the prompt string from the environment + variable each time it is displayed. + +config HUSH + bool "hush" + default n + help + hush is a small shell (22k). It handles the normal flow control + constructs such as if/then/elif/else/fi, for/in/do/done, while loops, + case/esac. Redirections, here documents, $((arithmetic)) + and functions are supported. + + It will compile and work on no-mmu systems. + + It does not handle select, aliases, brace expansion, + tilde expansion, &>file and >&file redirection of stdout+stderr. + +config HUSH_BASH_COMPAT + bool "bash-compatible extensions" + default y + depends on HUSH + help + Enable bash-compatible extensions. + +config HUSH_HELP + bool "help builtin" + default n + depends on HUSH + help + Enable help builtin in hush. Code size + ~1 kbyte. + +config HUSH_INTERACTIVE + bool "Interactive mode" + default y + depends on HUSH + help + Enable interactive mode (prompt and command editing). + Without this, hush simply reads and executes commands + from stdin just like a shell script from a file. + No prompt, no PS1/PS2 magic shell variables. + +config HUSH_JOB + bool "Job control" + default n + depends on HUSH_INTERACTIVE + help + Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current + command (not entire shell), fg/bg builtins work. Without this option, + "cmd &" still works by simply spawning a process and immediately + prompting for next command (or executing next command in a script), + but no separate process group is formed. + +config HUSH_TICK + bool "Process substitution" + default n + depends on HUSH + help + Enable process substitution `command` and $(command) in hush. + +config HUSH_IF + bool "Support if/then/elif/else/fi" + default n + depends on HUSH + help + Enable if/then/elif/else/fi in hush. + +config HUSH_LOOPS + bool "Support for, while and until loops" + default n + depends on HUSH + help + Enable for, while and until loops in hush. + +config HUSH_CASE + bool "Support case ... esac statement" + default n + depends on HUSH + help + Enable case ... esac statement in hush. +400 bytes. + +config HUSH_FUNCTIONS + bool "Support funcname() { commands; } syntax" + default n + depends on HUSH + help + Enable support for shell functions in hush. +800 bytes. + +config HUSH_LOCAL + bool "Support local builtin" + default n + depends on HUSH_FUNCTIONS + help + Enable support for local variables in functions. + +config HUSH_EXPORT_N + bool "Support export '-n' option" + default n + depends on HUSH + help + Enable support for export '-n' option in hush. It is a bash extension. + +config HUSH_RANDOM_SUPPORT + bool "Pseudorandom generator and $RANDOM variable" + default n + depends on HUSH + help + Enable pseudorandom generator and dynamic variable "$RANDOM". + Each read of "$RANDOM" will generate a new pseudorandom value. + +config LASH + bool "lash (deprecated: aliased to hush)" + default n + select HUSH + help + lash is deprecated and will be removed, please migrate to hush. + +config MSH + bool "msh (deprecated: please use hush)" + default n + select HUSH + help + msh is deprecated and will be removed, please migrate to hush. + If there is a feature msh has but hush does not, please let us know. + +# The minix shell (adds just 30k) is quite complete and handles things +# like for/do/done, case/esac and all the things you expect a Bourne +# shell to do. It is not always pedantically correct about Bourne +# shell grammar (try running the shell testscript "tests/sh.testcases" +# on it and compare vs bash) but for most things it works quite well. +# It uses only vfork, so it can be used on uClinux systems. + + +config SH_MATH_SUPPORT + bool "POSIX math support" + default y + depends on ASH || HUSH + help + Enable math support in the shell via $((...)) syntax. + +config SH_MATH_SUPPORT_64 + bool "Extend POSIX math support to 64 bit" + default n + depends on SH_MATH_SUPPORT + help + Enable 64-bit math support in the shell. This will make the shell + slightly larger, but will allow computation with very large numbers. + This is not in POSIX, so do not rely on this in portable code. + +config FEATURE_SH_EXTRA_QUIET + bool "Hide message on interactive shell startup" + default n + depends on MSH || LASH || HUSH || ASH + help + Remove the busybox introduction when starting a shell. + +config FEATURE_SH_STANDALONE + bool "Standalone shell" + default n + depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS + help + This option causes busybox shells to use busybox applets + in preference to executables in the PATH whenever possible. For + example, entering the command 'ifconfig' into the shell would cause + busybox to use the ifconfig busybox applet. Specifying the fully + qualified executable name, such as '/sbin/ifconfig' will still + execute the /sbin/ifconfig executable on the filesystem. This option + is generally used when creating a statically linked version of busybox + for use as a rescue shell, in the event that you screw up your system. + + This is implemented by re-execing /proc/self/exe (typically) + with right parameters. Some selected applets ("NOFORK" applets) + can even be executed without creating new process. + Instead, busybox will call <applet>_main() internally. + + However, this causes problems in chroot jails without mounted /proc + and with ps/top (command name can be shown as 'exe' for applets + started this way). +# untrue? +# Note that this will *also* cause applets to take precedence +# over shell builtins of the same name. So turning this on will +# eliminate any performance gained by turning on the builtin "echo" +# and "test" commands in ash. +# untrue? +# Note that when using this option, the shell will attempt to directly +# run '/bin/busybox'. If you do not have the busybox binary sitting in +# that exact location with that exact name, this option will not work at +# all. + +config FEATURE_SH_NOFORK + bool "Run 'nofork' applets directly" + default n + depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS + help + This option causes busybox shells [currently only ash] + to not execute typical fork/exec/wait sequence, but call <applet>_main + directly, if possible. (Sometimes it is not possible: for example, + this is not possible in pipes). + + This will be done only for some applets (those which are marked + NOFORK in include/applets.h). + + This may significantly speed up some shell scripts. + + This feature is relatively new. Use with care. + +config CTTYHACK + bool "cttyhack" + default n + help + One common problem reported on the mailing list is "can't access tty; + job control turned off" error message which typically appears when + one tries to use shell with stdin/stdout opened to /dev/console. + This device is special - it cannot be a controlling tty. + + Proper solution is to use correct device instead of /dev/console. + + cttyhack provides "quick and dirty" solution to this problem. + It analyzes stdin with various ioctls, trying to determine whether + it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line). + If it detects one, it closes stdin/out/err and reopens that device. + Then it executes given program. Opening the device will make + that device a controlling tty. This may require cttyhack + to be a session leader. + + Example for /etc/inittab (for busybox init): + + ::respawn:/bin/cttyhack /bin/sh + + Giving controlling tty to shell running with PID 1: + + $ exec cttyhack sh + + Starting an interactive shell from boot shell script: + + setsid cttyhack sh + +endmenu |