X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=shell%2FConfig.in;h=57969f02cdf00f054573a2508ac64becdcb78264;hb=e18255d1dadc9686daa328fa121423b47d2f6af4;hp=3cd7c3c5b2a2948ccbbc76a8144351f0fab51306;hpb=38f6319421c1892ea5c9c0484cec0e190bdc5c69;p=oweals%2Fbusybox.git diff --git a/shell/Config.in b/shell/Config.in index 3cd7c3c5b..57969f02c 100644 --- a/shell/Config.in +++ b/shell/Config.in @@ -20,9 +20,9 @@ config FEATURE_SH_IS_HUSH select HUSH bool "hush" -config FEATURE_SH_IS_LASH - select LASH - bool "lash" +####config FEATURE_SH_IS_LASH +#### select LASH +#### bool "lash" config FEATURE_SH_IS_MSH select MSH @@ -36,17 +36,23 @@ endchoice config ASH bool "ash" default n - select TEST 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' + 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. comment "Ash Shell Options" depends on ASH +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 @@ -63,7 +69,7 @@ config ASH_READ_NCHARS 'read -s' will read without echoing the user's input. config ASH_READ_TIMEOUT - bool "'read -t S' support." + bool "'read -t S' support" default n depends on ASH help @@ -78,22 +84,6 @@ config ASH_ALIAS help Enable alias support in the ash shell. -config ASH_MATH_SUPPORT - bool "Posix math support" - default y - depends on ASH - help - Enable math support in the ash shell. - -config ASH_MATH_SUPPORT_64 - bool "Extend Posix math support to 64 bit" - default n - depends on ASH_MATH_SUPPORT - help - Enable 64-bit math support in the ash shell. This will make - the shell slightly larger, but will allow computation with very - large numbers. - config ASH_GETOPTS bool "Builtin getopt to parse positional parameters" default n @@ -104,18 +94,23 @@ config ASH_GETOPTS config ASH_BUILTIN_ECHO bool "Builtin version of 'echo'" default y - select ECHO depends on ASH help - Enable support for echo, built in to ash. + 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 - select TEST depends on ASH help - Enable support for test, built in to ash. + Enable support for test, builtin to ash. config ASH_CMDCMD bool "'command' command to override shell builtins" @@ -141,14 +136,14 @@ config ASH_OPTIMIZE_FOR_SIZE Compile ash for reduced size at the price of speed. config ASH_RANDOM_SUPPORT - bool "Pseudorandom generator and variable $RANDOM" + 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" then generator will switch off and this + After "unset RANDOM" the generator will switch off and this variable will no longer have special treatment. config ASH_EXPAND_PRMT @@ -156,59 +151,135 @@ config ASH_EXPAND_PRMT default n depends on ASH help - "PS#" may be contain volatile content, such as backquote commands. + "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 - select TRUE - select FALSE - select TEST help - hush is a very small shell (just 18k) and it has fairly complete - Bourne shell grammar. It even handles all the normal flow control - options such as if/then/elif/else/fi, for/in/do/done, while loops, - etc. + 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 does not handle case/esac, select, function, here documents ( << - word ), arithmetic expansion, aliases, brace expansion, tilde - expansion, &> and >& redirection of stdout+stderr, etc. + 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 LASH - bool "lash" +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 the 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_EXPORT_N + bool "Support export '-n' option" default n - select TRUE - select FALSE - select TEST + depends on HUSH help - lash is the very smallest shell (adds just 10k) and it is quite - usable as a command prompt, but it is not suitable for any but the - most trivial scripting (such as an initrd that calls insmod a few - times) since it does not understand any Bourne shell grammar. It - does handle pipes, redirects, and job control though. Adding in - command editing makes it a very nice lightweight command prompt. + Enable support for export '-n' option in hush. It is a bash extension. +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" + bool "msh (deprecated: please use hush)" default n - select TRUE - select FALSE - select TEST help - 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 also uses only vfork, so it can be used on uClinux systems. + 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. + comment "Bourne Shell Options" depends on MSH || LASH || HUSH || ASH +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 @@ -216,28 +287,74 @@ config FEATURE_SH_EXTRA_QUIET help Remove the busybox introduction when starting a shell. -config FEATURE_SH_STANDALONE_SHELL +config FEATURE_SH_STANDALONE bool "Standalone shell" default n - depends on MSH || LASH || HUSH || ASH + depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS help - This option causes the selected busybox shell to use busybox applets - in preference to executables in the PATH whenever possible. For + 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 + 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 + 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. - 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. + 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 _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 _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. Usage example for /etc/inittab + (for busybox init): - 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. + ::respawn:/bin/cttyhack /bin/sh endmenu