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 | choice
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9 | prompt "Choose your default shell"
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10 | default FEATURE_SH_IS_NONE
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11 | help
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12 | Choose a shell. The ash shell is the most bash compatible
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13 | and full featured one.
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14 |
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15 | config FEATURE_SH_IS_ASH
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16 | select ASH
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17 | bool "ash"
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18 |
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19 | config FEATURE_SH_IS_HUSH
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20 | select HUSH
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21 | bool "hush"
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22 |
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23 | config FEATURE_SH_IS_LASH
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24 | select LASH
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25 | bool "lash"
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26 |
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27 | config FEATURE_SH_IS_MSH
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28 | select MSH
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29 | bool "msh"
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30 |
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31 | config FEATURE_SH_IS_NONE
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32 | bool "none"
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33 |
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34 | endchoice
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35 |
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36 | config ASH
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37 | bool "ash"
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38 | default n
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39 | select TEST
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40 | help
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41 | Tha 'ash' shell adds about 60k in the default configuration and is
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42 | the most complete and most pedantically correct shell included with
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43 | busybox. This shell is actually a derivative of the Debian 'dash'
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44 | shell (by Herbert Xu), which was created by porting the 'ash' shell
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45 | (written by Kenneth Almquist) from NetBSD.
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46 |
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47 | comment "Ash Shell Options"
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48 | depends on ASH
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49 |
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50 | config ASH_JOB_CONTROL
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51 | bool "Job control"
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52 | default y
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53 | depends on ASH
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54 | help
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55 | Enable job control in the ash shell.
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56 |
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57 | config ASH_READ_NCHARS
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58 | bool "'read -n N' and 'read -s' support"
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59 | default n
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60 | depends on ASH
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61 | help
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62 | 'read -n N' will return a value after N characters have been read.
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63 | 'read -s' will read without echoing the user's input.
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64 |
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65 | config ASH_READ_TIMEOUT
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66 | bool "'read -t S' support."
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67 | default n
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68 | depends on ASH
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69 | help
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70 | 'read -t S' will return a value after S seconds have passed.
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71 | This implementation will allow fractional seconds, expressed
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72 | as a decimal fraction, e.g. 'read -t 2.5 foo'.
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73 |
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74 | config ASH_ALIAS
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75 | bool "alias support"
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76 | default y
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77 | depends on ASH
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78 | help
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79 | Enable alias support in the ash shell.
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80 |
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81 | config ASH_MATH_SUPPORT
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82 | bool "Posix math support"
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83 | default y
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84 | depends on ASH
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85 | help
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86 | Enable math support in the ash shell.
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87 |
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88 | config ASH_MATH_SUPPORT_64
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89 | bool "Extend Posix math support to 64 bit"
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90 | default n
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91 | depends on ASH_MATH_SUPPORT
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92 | help
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93 | Enable 64-bit math support in the ash shell. This will make
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94 | the shell slightly larger, but will allow computation with very
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95 | large numbers.
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96 |
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97 | config ASH_GETOPTS
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98 | bool "Builtin getopt to parse positional parameters"
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99 | default n
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100 | depends on ASH
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101 | help
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102 | Enable getopts builtin in the ash shell.
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103 |
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104 | config ASH_BUILTIN_ECHO
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105 | bool "Builtin version of 'echo'"
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106 | default y
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107 | select ECHO
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108 | depends on ASH
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109 | help
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110 | Enable support for echo, builtin to ash.
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111 |
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112 | config ASH_BUILTIN_TEST
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113 | bool "Builtin version of 'test'"
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114 | default y
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115 | select TEST
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116 | depends on ASH
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117 | help
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118 | Enable support for test, builtin to ash.
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119 |
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120 | config ASH_CMDCMD
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121 | bool "'command' command to override shell builtins"
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122 | default n
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123 | depends on ASH
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124 | help
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125 | Enable support for the ash 'command' builtin, which allows
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126 | you to run the specified command with the specified arguments,
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127 | even when there is an ash builtin command with the same name.
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128 |
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129 | config ASH_MAIL
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130 | bool "Check for new mail on interactive shells"
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131 | default y
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132 | depends on ASH
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133 | help
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134 | Enable "check for new mail" in the ash shell.
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135 |
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136 | config ASH_OPTIMIZE_FOR_SIZE
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137 | bool "Optimize for size instead of speed"
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138 | default y
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139 | depends on ASH
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140 | help
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141 | Compile ash for reduced size at the price of speed.
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142 |
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143 | config ASH_RANDOM_SUPPORT
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144 | bool "Pseudorandom generator and variable $RANDOM"
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145 | default n
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146 | depends on ASH
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147 | help
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148 | Enable pseudorandom generator and dynamic variable "$RANDOM".
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149 | Each read of "$RANDOM" will generate a new pseudorandom value.
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150 | You can reset the generator by using a specified start value.
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151 | After "unset RANDOM" then generator will switch off and this
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152 | variable will no longer have special treatment.
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153 |
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154 | config ASH_EXPAND_PRMT
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155 | bool "Expand prompt string"
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156 | default n
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157 | depends on ASH
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158 | help
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159 | "PS#" may be contain volatile content, such as backquote commands.
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160 | This option recreates the prompt string from the environment
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161 | variable each time it is displayed.
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162 |
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163 | config HUSH
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164 | bool "hush"
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165 | default n
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166 | select TRUE
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167 | select FALSE
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168 | select TEST
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169 | help
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170 | hush is a very small shell (just 18k) and it has fairly complete
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171 | Bourne shell grammar. It even handles all the normal flow control
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172 | options such as if/then/elif/else/fi, for/in/do/done, while loops,
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173 | etc.
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174 |
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175 | It does not handle case/esac, select, function, here documents ( <<
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176 | word ), arithmetic expansion, aliases, brace expansion, tilde
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177 | expansion, &> and >& redirection of stdout+stderr, etc.
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178 |
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179 | config HUSH_HELP
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180 | bool "help builtin"
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181 | default n
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182 | depends on HUSH
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183 | help
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184 | Enable help builtin in hush. Code size + ~1 kbyte.
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185 |
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186 | config HUSH_INTERACTIVE
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187 | bool "Interactive mode"
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188 | default y
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189 | depends on HUSH
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190 | help
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191 | Enable interactive mode (prompt and command editing).
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192 | Without this, hush simply reads and executes commands
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193 | from stdin just like a shell script from the file.
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194 | No prompt, no PS1/PS2 magic shell variables.
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195 |
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196 | config HUSH_JOB
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197 | bool "Job control"
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198 | default n
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199 | depends on HUSH_INTERACTIVE
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200 | help
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201 | Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
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202 | command (not entire shell), fg/bg builtins work. Without this option,
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203 | "cmd &" still works by simply spawning a process and immediately
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204 | prompting for next command (or executing next command in a script),
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205 | but no separate process group is formed.
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206 |
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207 | config HUSH_TICK
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208 | bool "Process substitution"
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209 | default n
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210 | depends on HUSH
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211 | help
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212 | Enable process substitution `command` and $(command) in hush.
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213 |
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214 | config HUSH_IF
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215 | bool "Support if/then/elif/else/fi"
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216 | default n
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217 | depends on HUSH
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218 | help
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219 | Enable if/then/elif/else/fi in hush.
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220 |
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221 | config HUSH_LOOPS
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222 | bool "Support for, while and until loops"
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223 | default n
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224 | depends on HUSH
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225 | help
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226 | Enable for, while and until loops in hush.
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227 |
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228 | config LASH
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229 | bool "lash"
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230 | default n
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231 | select TRUE
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232 | select FALSE
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233 | select TEST
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234 | help
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235 | lash is the very smallest shell (adds just 10k) and it is quite
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236 | usable as a command prompt, but it is not suitable for any but the
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237 | most trivial scripting (such as an initrd that calls insmod a few
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238 | times) since it does not understand any Bourne shell grammar. It
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239 | does handle pipes, redirects, and job control though. Adding in
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240 | command editing makes it a very nice lightweight command prompt.
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241 |
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242 |
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243 | config MSH
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244 | bool "msh"
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245 | default n
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246 | select TRUE
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247 | select FALSE
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248 | select TEST
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249 | help
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250 | The minix shell (adds just 30k) is quite complete and handles things
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251 | like for/do/done, case/esac and all the things you expect a Bourne
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252 | shell to do. It is not always pedantically correct about Bourne
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253 | shell grammar (try running the shell testscript "tests/sh.testcases"
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254 | on it and compare vs bash) but for most things it works quite well.
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255 | It also uses only vfork, so it can be used on uClinux systems.
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256 |
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257 | comment "Bourne Shell Options"
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258 | depends on MSH || LASH || HUSH || ASH
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259 |
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260 | config FEATURE_SH_EXTRA_QUIET
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261 | bool "Hide message on interactive shell startup"
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262 | default n
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263 | depends on MSH || LASH || HUSH || ASH
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264 | help
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265 | Remove the busybox introduction when starting a shell.
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266 |
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267 | config FEATURE_SH_STANDALONE
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268 | bool "Standalone shell"
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269 | default n
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270 | depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
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271 | help
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272 | This option causes busybox shells to use busybox applets
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273 | in preference to executables in the PATH whenever possible. For
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274 | example, entering the command 'ifconfig' into the shell would cause
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275 | busybox to use the ifconfig busybox applet. Specifying the fully
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276 | qualified executable name, such as '/sbin/ifconfig' will still
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277 | execute the /sbin/ifconfig executable on the filesystem. This option
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278 | is generally used when creating a statically linked version of busybox
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279 | for use as a rescue shell, in the event that you screw up your system.
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280 |
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281 | This is implemented by re-execing /proc/self/exe (typically)
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282 | with right parameters. Some selected applets ("NOFORK" applets)
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283 | can even be executed without creating new process.
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284 | Instead, busybox will call <applet>_main() internally.
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285 |
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286 | However, this causes problems in chroot jails without mounted /proc
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287 | and with ps/top (command name can be shown as 'exe' for applets
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288 | started this way).
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289 | # untrue?
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290 | # Note that this will *also* cause applets to take precedence
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291 | # over shell builtins of the same name. So turning this on will
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292 | # eliminate any performance gained by turning on the builtin "echo"
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293 | # and "test" commands in ash.
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294 | # untrue?
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295 | # Note that when using this option, the shell will attempt to directly
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296 | # run '/bin/busybox'. If you do not have the busybox binary sitting in
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297 | # that exact location with that exact name, this option will not work at
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298 | # all.
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299 |
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300 | config CTTYHACK
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301 | bool "cttyhack"
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302 | default n
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303 | help
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304 | One common problem reported on the mailing list is "can't access tty;
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305 | job control turned off" error message which typically appears when
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306 | one tries to use shell with stdin/stdout opened to /dev/console.
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307 | This device is special - it cannot be a controlling tty.
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308 |
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309 | Proper solution is to use correct device instead of /dev/console.
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310 |
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311 | cttyhack provides "quick and dirty" solution to this problem.
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312 | It analyzes stdin with various ioctls, trying to determine whether
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313 | it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
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314 | If it detects one, it closes stdin/out/err and reopens that device.
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315 | Then it executes given program. Usage example for /etc/inittab
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316 | (for busybox init):
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317 |
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318 | ::respawn:/bin/cttyhack /bin/sh
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319 |
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320 | endmenu
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