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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