140 lines
4.2 KiB
Plaintext
140 lines
4.2 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see scripts/kbuild/config-language.txt.
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#
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menu "Shells"
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INSERT
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choice
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prompt "Choose which shell is aliased to 'sh' name"
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default FEATURE_SH_IS_ASH
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help
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Choose which shell you want to be executed by 'sh' alias.
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The ash shell is the most bash compatible and full featured one.
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# note: cannot use "select ASH" here, it breaks "make allnoconfig"
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config FEATURE_SH_IS_ASH
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depends on ASH
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bool "ash"
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depends on !NOMMU
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config FEATURE_SH_IS_HUSH
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depends on HUSH
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bool "hush"
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config FEATURE_SH_IS_NONE
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bool "none"
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endchoice
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choice
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prompt "Choose which shell is aliased to 'bash' name"
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default FEATURE_BASH_IS_NONE
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help
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Choose which shell you want to be executed by 'bash' alias.
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The ash shell is the most bash compatible and full featured one.
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Note that selecting this option does not switch on any bash
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compatibility code. It merely makes it possible to install
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/bin/bash (sym)link and run scripts which start with
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#!/bin/bash line.
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Many systems use it in scripts which use bash-specific features,
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even simple ones like $RANDOM. Without this option, busybox
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can't be used for running them because it won't recongnize
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"bash" as a supported applet name.
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config FEATURE_BASH_IS_ASH
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depends on ASH
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bool "ash"
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depends on !NOMMU
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config FEATURE_BASH_IS_HUSH
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depends on HUSH
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bool "hush"
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config FEATURE_BASH_IS_NONE
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bool "none"
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endchoice
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config SH_MATH_SUPPORT
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bool "POSIX math support"
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default y
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depends on ASH || HUSH
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help
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Enable math support in the shell via $((...)) syntax.
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config SH_MATH_SUPPORT_64
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bool "Extend POSIX math support to 64 bit"
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default y
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depends on SH_MATH_SUPPORT
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help
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Enable 64-bit math support in the shell. This will make the shell
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slightly larger, but will allow computation with very large numbers.
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This is not in POSIX, so do not rely on this in portable code.
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config FEATURE_SH_EXTRA_QUIET
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bool "Hide message on interactive shell startup"
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default y
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depends on HUSH || ASH
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help
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Remove the busybox introduction when starting a shell.
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config FEATURE_SH_STANDALONE
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bool "Standalone shell"
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default n
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depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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help
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This option causes busybox shells to use busybox applets
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in preference to executables in the PATH whenever possible. For
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example, entering the command 'ifconfig' into the shell would cause
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busybox to use the ifconfig busybox applet. Specifying the fully
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qualified executable name, such as '/sbin/ifconfig' will still
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execute the /sbin/ifconfig executable on the filesystem. This option
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is generally used when creating a statically linked version of busybox
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for use as a rescue shell, in the event that you screw up your system.
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This is implemented by re-execing /proc/self/exe (typically)
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with right parameters. Some selected applets ("NOFORK" applets)
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can even be executed without creating new process.
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Instead, busybox will call <applet>_main() internally.
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However, this causes problems in chroot jails without mounted /proc
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and with ps/top (command name can be shown as 'exe' for applets
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started this way).
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# untrue?
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# Note that this will *also* cause applets to take precedence
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# over shell builtins of the same name. So turning this on will
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# eliminate any performance gained by turning on the builtin "echo"
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# and "test" commands in ash.
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# untrue?
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# Note that when using this option, the shell will attempt to directly
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# run '/bin/busybox'. If you do not have the busybox binary sitting in
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# that exact location with that exact name, this option will not work at
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# all.
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config FEATURE_SH_NOFORK
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bool "Run 'nofork' applets directly"
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default n
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depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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help
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This option causes busybox shells to not execute typical
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fork/exec/wait sequence, but call <applet>_main directly,
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if possible. (Sometimes it is not possible: for example,
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this is not possible in pipes).
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This will be done only for some applets (those which are marked
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NOFORK in include/applets.h).
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This may significantly speed up some shell scripts.
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This feature is relatively new. Use with care. Report bugs
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to project mailing list.
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endmenu
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