[3320] | 1 | #
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| 2 | # For a description of the syntax of this configuration file,
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| 3 | # see scripts/kbuild/config-language.txt.
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| 4 | #
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| 5 |
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| 6 | menu "Shells"
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| 7 |
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| 8 | INSERT
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| 9 |
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| 10 |
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| 11 | choice
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| 12 | prompt "Choose which shell is aliased to 'sh' name"
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| 13 | default FEATURE_SH_IS_ASH
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| 14 | help
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| 15 | Choose which shell you want to be executed by 'sh' alias.
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| 16 | The ash shell is the most bash compatible and full featured one.
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| 17 |
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| 18 | # note: cannot use "select ASH" here, it breaks "make allnoconfig"
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| 19 | config FEATURE_SH_IS_ASH
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| 20 | depends on ASH
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| 21 | bool "ash"
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| 22 | depends on !NOMMU
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| 23 |
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| 24 | config FEATURE_SH_IS_HUSH
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| 25 | depends on HUSH
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| 26 | bool "hush"
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| 27 |
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| 28 | config FEATURE_SH_IS_NONE
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| 29 | bool "none"
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| 30 |
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| 31 | endchoice
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| 32 |
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| 33 | choice
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| 34 | prompt "Choose which shell is aliased to 'bash' name"
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| 35 | default FEATURE_BASH_IS_NONE
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| 36 | help
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| 37 | Choose which shell you want to be executed by 'bash' alias.
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| 38 | The ash shell is the most bash compatible and full featured one.
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| 39 |
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| 40 | Note that selecting this option does not switch on any bash
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| 41 | compatibility code. It merely makes it possible to install
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| 42 | /bin/bash (sym)link and run scripts which start with
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| 43 | #!/bin/bash line.
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| 44 |
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| 45 | Many systems use it in scripts which use bash-specific features,
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| 46 | even simple ones like $RANDOM. Without this option, busybox
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| 47 | can't be used for running them because it won't recongnize
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| 48 | "bash" as a supported applet name.
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| 49 |
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| 50 | config FEATURE_BASH_IS_ASH
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| 51 | depends on ASH
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| 52 | bool "ash"
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| 53 | depends on !NOMMU
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| 54 |
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| 55 | config FEATURE_BASH_IS_HUSH
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| 56 | depends on HUSH
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| 57 | bool "hush"
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| 58 |
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| 59 | config FEATURE_BASH_IS_NONE
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| 60 | bool "none"
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| 61 |
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| 62 | endchoice
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| 63 |
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| 64 |
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| 65 | config SH_MATH_SUPPORT
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| 66 | bool "POSIX math support"
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| 67 | default y
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| 68 | depends on ASH || HUSH
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| 69 | help
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| 70 | Enable math support in the shell via $((...)) syntax.
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| 71 |
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| 72 | config SH_MATH_SUPPORT_64
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| 73 | bool "Extend POSIX math support to 64 bit"
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| 74 | default y
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| 75 | depends on SH_MATH_SUPPORT
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| 76 | help
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| 77 | Enable 64-bit math support in the shell. This will make the shell
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| 78 | slightly larger, but will allow computation with very large numbers.
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| 79 | This is not in POSIX, so do not rely on this in portable code.
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| 80 |
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| 81 | config FEATURE_SH_EXTRA_QUIET
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| 82 | bool "Hide message on interactive shell startup"
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| 83 | default y
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| 84 | depends on HUSH || ASH
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| 85 | help
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| 86 | Remove the busybox introduction when starting a shell.
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| 87 |
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| 88 | config FEATURE_SH_STANDALONE
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| 89 | bool "Standalone shell"
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| 90 | default n
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| 91 | depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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| 92 | help
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| 93 | This option causes busybox shells to use busybox applets
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| 94 | in preference to executables in the PATH whenever possible. For
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| 95 | example, entering the command 'ifconfig' into the shell would cause
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| 96 | busybox to use the ifconfig busybox applet. Specifying the fully
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| 97 | qualified executable name, such as '/sbin/ifconfig' will still
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| 98 | execute the /sbin/ifconfig executable on the filesystem. This option
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| 99 | is generally used when creating a statically linked version of busybox
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| 100 | for use as a rescue shell, in the event that you screw up your system.
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| 101 |
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| 102 | This is implemented by re-execing /proc/self/exe (typically)
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| 103 | with right parameters. Some selected applets ("NOFORK" applets)
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| 104 | can even be executed without creating new process.
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| 105 | Instead, busybox will call <applet>_main() internally.
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| 106 |
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| 107 | However, this causes problems in chroot jails without mounted /proc
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| 108 | and with ps/top (command name can be shown as 'exe' for applets
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| 109 | started this way).
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| 110 | # untrue?
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| 111 | # Note that this will *also* cause applets to take precedence
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| 112 | # over shell builtins of the same name. So turning this on will
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| 113 | # eliminate any performance gained by turning on the builtin "echo"
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| 114 | # and "test" commands in ash.
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| 115 | # untrue?
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| 116 | # Note that when using this option, the shell will attempt to directly
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| 117 | # run '/bin/busybox'. If you do not have the busybox binary sitting in
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| 118 | # that exact location with that exact name, this option will not work at
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| 119 | # all.
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| 120 |
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| 121 | config FEATURE_SH_NOFORK
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| 122 | bool "Run 'nofork' applets directly"
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| 123 | default n
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| 124 | depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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| 125 | help
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| 126 | This option causes busybox shells [currently only ash]
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| 127 | to not execute typical fork/exec/wait sequence, but call <applet>_main
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| 128 | directly, if possible. (Sometimes it is not possible: for example,
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| 129 | this is not possible in pipes).
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| 130 |
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| 131 | This will be done only for some applets (those which are marked
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| 132 | NOFORK in include/applets.h).
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| 133 |
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| 134 | This may significantly speed up some shell scripts.
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| 135 |
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| 136 | This feature is relatively new. Use with care.
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| 137 |
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| 138 | endmenu
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