| 1 | # DO NOT EDIT. This file is generated from Config.src
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| 2 | #
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| 3 | # For a description of the syntax of this configuration file,
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| 4 | # see scripts/kbuild/config-language.txt.
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| 5 | #
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| 6 |
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| 7 | menu "Shells"
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| 8 |
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| 9 | config ASH
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| 10 | bool "ash"
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| 11 | default y
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| 12 | depends on !NOMMU
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| 13 | help
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| 14 | Tha 'ash' shell adds about 60k in the default configuration and is
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| 15 | the most complete and most pedantically correct shell included with
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| 16 | busybox. This shell is actually a derivative of the Debian 'dash'
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| 17 | shell (by Herbert Xu), which was created by porting the 'ash' shell
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| 18 | (written by Kenneth Almquist) from NetBSD.
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| 19 |
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| 20 | config ASH_BASH_COMPAT
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| 21 | bool "bash-compatible extensions"
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| 22 | default y
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| 23 | depends on ASH
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| 24 | help
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| 25 | Enable bash-compatible extensions.
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| 26 |
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| 27 | config ASH_JOB_CONTROL
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| 28 | bool "Job control"
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| 29 | default y
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| 30 | depends on ASH
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| 31 | help
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| 32 | Enable job control in the ash shell.
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| 33 |
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| 34 | config ASH_ALIAS
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| 35 | bool "alias support"
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| 36 | default y
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| 37 | depends on ASH
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| 38 | help
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| 39 | Enable alias support in the ash shell.
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| 40 |
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| 41 | config ASH_GETOPTS
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| 42 | bool "Builtin getopt to parse positional parameters"
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| 43 | default y
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| 44 | depends on ASH
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| 45 | help
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| 46 | Enable getopts builtin in the ash shell.
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| 47 |
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| 48 | config ASH_BUILTIN_ECHO
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| 49 | bool "Builtin version of 'echo'"
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| 50 | default y
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| 51 | depends on ASH
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| 52 | help
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| 53 | Enable support for echo, builtin to ash.
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| 54 |
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| 55 | config ASH_BUILTIN_PRINTF
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| 56 | bool "Builtin version of 'printf'"
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| 57 | default y
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| 58 | depends on ASH
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| 59 | help
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| 60 | Enable support for printf, builtin to ash.
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| 61 |
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| 62 | config ASH_BUILTIN_TEST
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| 63 | bool "Builtin version of 'test'"
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| 64 | default y
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| 65 | depends on ASH
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| 66 | help
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| 67 | Enable support for test, builtin to ash.
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| 68 |
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| 69 | config ASH_CMDCMD
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| 70 | bool "'command' command to override shell builtins"
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| 71 | default y
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| 72 | depends on ASH
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| 73 | help
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| 74 | Enable support for the ash 'command' builtin, which allows
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| 75 | you to run the specified command with the specified arguments,
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| 76 | even when there is an ash builtin command with the same name.
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| 77 |
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| 78 | config ASH_MAIL
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| 79 | bool "Check for new mail on interactive shells"
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| 80 | default n
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| 81 | depends on ASH
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| 82 | help
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| 83 | Enable "check for new mail" in the ash shell.
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| 84 |
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| 85 | config ASH_OPTIMIZE_FOR_SIZE
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| 86 | bool "Optimize for size instead of speed"
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| 87 | default y
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| 88 | depends on ASH
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| 89 | help
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| 90 | Compile ash for reduced size at the price of speed.
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| 91 |
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| 92 | config ASH_RANDOM_SUPPORT
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| 93 | bool "Pseudorandom generator and $RANDOM variable"
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| 94 | default y
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| 95 | depends on ASH
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| 96 | help
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| 97 | Enable pseudorandom generator and dynamic variable "$RANDOM".
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| 98 | Each read of "$RANDOM" will generate a new pseudorandom value.
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| 99 | You can reset the generator by using a specified start value.
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| 100 | After "unset RANDOM" the generator will switch off and this
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| 101 | variable will no longer have special treatment.
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| 102 |
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| 103 | config ASH_EXPAND_PRMT
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| 104 | bool "Expand prompt string"
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| 105 | default y
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| 106 | depends on ASH
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| 107 | help
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| 108 | "PS#" may contain volatile content, such as backquote commands.
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| 109 | This option recreates the prompt string from the environment
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| 110 | variable each time it is displayed.
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| 111 |
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| 112 | config CTTYHACK
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| 113 | bool "cttyhack"
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| 114 | default y
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| 115 | help
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| 116 | One common problem reported on the mailing list is "can't access tty;
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| 117 | job control turned off" error message which typically appears when
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| 118 | one tries to use shell with stdin/stdout opened to /dev/console.
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| 119 | This device is special - it cannot be a controlling tty.
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| 120 |
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| 121 | Proper solution is to use correct device instead of /dev/console.
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| 122 |
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| 123 | cttyhack provides "quick and dirty" solution to this problem.
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| 124 | It analyzes stdin with various ioctls, trying to determine whether
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| 125 | it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
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| 126 | If it detects one, it closes stdin/out/err and reopens that device.
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| 127 | Then it executes given program. Opening the device will make
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| 128 | that device a controlling tty. This may require cttyhack
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| 129 | to be a session leader.
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| 130 |
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| 131 | Example for /etc/inittab (for busybox init):
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| 132 |
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| 133 | ::respawn:/bin/cttyhack /bin/sh
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| 134 |
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| 135 | Starting an interactive shell from boot shell script:
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| 136 |
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| 137 | setsid cttyhack sh
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| 138 |
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| 139 | Giving controlling tty to shell running with PID 1:
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| 140 |
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| 141 | # exec cttyhack sh
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| 142 |
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| 143 | Without cttyhack, you need to know exact tty name,
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| 144 | and do something like this:
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| 145 |
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| 146 | # exec setsid sh -c 'exec sh </dev/tty1 >/dev/tty1 2>&1'
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| 147 |
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| 148 | config HUSH
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| 149 | bool "hush"
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| 150 | default y
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| 151 | help
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| 152 | hush is a small shell (25k). It handles the normal flow control
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| 153 | constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
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| 154 | case/esac. Redirections, here documents, $((arithmetic))
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| 155 | and functions are supported.
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| 156 |
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| 157 | It will compile and work on no-mmu systems.
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| 158 |
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| 159 | It does not handle select, aliases, tilde expansion,
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| 160 | &>file and >&file redirection of stdout+stderr.
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| 161 |
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| 162 | config HUSH_BASH_COMPAT
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| 163 | bool "bash-compatible extensions"
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| 164 | default y
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| 165 | depends on HUSH
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| 166 | help
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| 167 | Enable bash-compatible extensions.
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| 168 |
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| 169 | config HUSH_BRACE_EXPANSION
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| 170 | bool "Brace expansion"
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| 171 | default y
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| 172 | depends on HUSH_BASH_COMPAT
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| 173 | help
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| 174 | Enable {abc,def} extension.
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| 175 |
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| 176 | config HUSH_HELP
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| 177 | bool "help builtin"
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| 178 | default y
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| 179 | depends on HUSH
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| 180 | help
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| 181 | Enable help builtin in hush. Code size + ~1 kbyte.
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| 182 |
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| 183 | config HUSH_INTERACTIVE
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| 184 | bool "Interactive mode"
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| 185 | default y
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| 186 | depends on HUSH
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| 187 | help
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| 188 | Enable interactive mode (prompt and command editing).
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| 189 | Without this, hush simply reads and executes commands
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| 190 | from stdin just like a shell script from a file.
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| 191 | No prompt, no PS1/PS2 magic shell variables.
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| 192 |
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| 193 | config HUSH_SAVEHISTORY
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| 194 | bool "Save command history to .hush_history"
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| 195 | default y
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| 196 | depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
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| 197 | help
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| 198 | Enable history saving in hush.
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| 199 |
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| 200 | config HUSH_JOB
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| 201 | bool "Job control"
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| 202 | default y
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| 203 | depends on HUSH_INTERACTIVE
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| 204 | help
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| 205 | Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
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| 206 | command (not entire shell), fg/bg builtins work. Without this option,
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| 207 | "cmd &" still works by simply spawning a process and immediately
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| 208 | prompting for next command (or executing next command in a script),
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| 209 | but no separate process group is formed.
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| 210 |
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| 211 | config HUSH_TICK
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| 212 | bool "Process substitution"
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| 213 | default y
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| 214 | depends on HUSH
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| 215 | help
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| 216 | Enable process substitution `command` and $(command) in hush.
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| 217 |
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| 218 | config HUSH_IF
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| 219 | bool "Support if/then/elif/else/fi"
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| 220 | default y
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| 221 | depends on HUSH
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| 222 | help
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| 223 | Enable if/then/elif/else/fi in hush.
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| 224 |
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| 225 | config HUSH_LOOPS
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| 226 | bool "Support for, while and until loops"
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| 227 | default y
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| 228 | depends on HUSH
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| 229 | help
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| 230 | Enable for, while and until loops in hush.
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| 231 |
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| 232 | config HUSH_CASE
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| 233 | bool "Support case ... esac statement"
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| 234 | default y
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| 235 | depends on HUSH
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| 236 | help
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| 237 | Enable case ... esac statement in hush. +400 bytes.
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| 238 |
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| 239 | config HUSH_FUNCTIONS
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| 240 | bool "Support funcname() { commands; } syntax"
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| 241 | default y
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| 242 | depends on HUSH
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| 243 | help
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| 244 | Enable support for shell functions in hush. +800 bytes.
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| 245 |
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| 246 | config HUSH_LOCAL
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| 247 | bool "Support local builtin"
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| 248 | default y
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| 249 | depends on HUSH_FUNCTIONS
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| 250 | help
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| 251 | Enable support for local variables in functions.
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| 252 |
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| 253 | config HUSH_RANDOM_SUPPORT
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| 254 | bool "Pseudorandom generator and $RANDOM variable"
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| 255 | default y
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| 256 | depends on HUSH
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| 257 | help
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| 258 | Enable pseudorandom generator and dynamic variable "$RANDOM".
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| 259 | Each read of "$RANDOM" will generate a new pseudorandom value.
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| 260 |
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| 261 | config HUSH_EXPORT_N
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| 262 | bool "Support 'export -n' option"
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| 263 | default y
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| 264 | depends on HUSH
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| 265 | help
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| 266 | export -n unexports variables. It is a bash extension.
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| 267 |
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| 268 | config HUSH_MODE_X
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| 269 | bool "Support 'hush -x' option and 'set -x' command"
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| 270 | default y
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| 271 | depends on HUSH
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| 272 | help
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| 273 | This instructs hush to print commands before execution.
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| 274 | Adds ~300 bytes.
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| 275 |
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| 276 | config MSH
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| 277 | bool "msh (deprecated: aliased to hush)"
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| 278 | default n
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| 279 | select HUSH
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| 280 | help
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| 281 | msh is deprecated and will be removed, please migrate to hush.
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| 282 |
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| 283 |
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| 284 | choice
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| 285 | prompt "Choose which shell is aliased to 'sh' name"
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| 286 | default FEATURE_SH_IS_ASH
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| 287 | help
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| 288 | Choose which shell you want to be executed by 'sh' alias.
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| 289 | The ash shell is the most bash compatible and full featured one.
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| 290 |
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| 291 | # note: cannot use "select ASH" here, it breaks "make allnoconfig"
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| 292 | config FEATURE_SH_IS_ASH
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| 293 | depends on ASH
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| 294 | bool "ash"
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| 295 | depends on !NOMMU
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| 296 |
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| 297 | config FEATURE_SH_IS_HUSH
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| 298 | depends on HUSH
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| 299 | bool "hush"
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| 300 |
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| 301 | config FEATURE_SH_IS_NONE
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| 302 | bool "none"
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| 303 |
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| 304 | endchoice
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| 305 |
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| 306 | choice
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| 307 | prompt "Choose which shell is aliased to 'bash' name"
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| 308 | default FEATURE_BASH_IS_NONE
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| 309 | help
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| 310 | Choose which shell you want to be executed by 'bash' alias.
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| 311 | The ash shell is the most bash compatible and full featured one.
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| 312 |
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| 313 | Note that selecting this option does not switch on any bash
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| 314 | compatibility code. It merely makes it possible to install
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| 315 | /bin/bash (sym)link and run scripts which start with
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| 316 | #!/bin/bash line.
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| 317 |
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| 318 | Many systems use it in scripts which use bash-specific features,
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| 319 | even simple ones like $RANDOM. Without this option, busybox
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| 320 | can't be used for running them because it won't recongnize
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| 321 | "bash" as a supported applet name.
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| 322 |
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| 323 | config FEATURE_BASH_IS_ASH
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| 324 | depends on ASH
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| 325 | bool "ash"
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| 326 | depends on !NOMMU
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| 327 |
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| 328 | config FEATURE_BASH_IS_HUSH
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| 329 | depends on HUSH
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| 330 | bool "hush"
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| 331 |
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| 332 | config FEATURE_BASH_IS_NONE
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| 333 | bool "none"
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| 334 |
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| 335 | endchoice
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| 336 |
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| 337 |
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| 338 | config SH_MATH_SUPPORT
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| 339 | bool "POSIX math support"
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| 340 | default y
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| 341 | depends on ASH || HUSH
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| 342 | help
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| 343 | Enable math support in the shell via $((...)) syntax.
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| 344 |
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| 345 | config SH_MATH_SUPPORT_64
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| 346 | bool "Extend POSIX math support to 64 bit"
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| 347 | default y
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| 348 | depends on SH_MATH_SUPPORT
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| 349 | help
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| 350 | Enable 64-bit math support in the shell. This will make the shell
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| 351 | slightly larger, but will allow computation with very large numbers.
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| 352 | This is not in POSIX, so do not rely on this in portable code.
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| 353 |
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| 354 | config FEATURE_SH_EXTRA_QUIET
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| 355 | bool "Hide message on interactive shell startup"
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| 356 | default y
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| 357 | depends on HUSH || ASH
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| 358 | help
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| 359 | Remove the busybox introduction when starting a shell.
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| 360 |
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| 361 | config FEATURE_SH_STANDALONE
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| 362 | bool "Standalone shell"
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| 363 | default n
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| 364 | depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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| 365 | help
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| 366 | This option causes busybox shells to use busybox applets
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| 367 | in preference to executables in the PATH whenever possible. For
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| 368 | example, entering the command 'ifconfig' into the shell would cause
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| 369 | busybox to use the ifconfig busybox applet. Specifying the fully
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| 370 | qualified executable name, such as '/sbin/ifconfig' will still
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| 371 | execute the /sbin/ifconfig executable on the filesystem. This option
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| 372 | is generally used when creating a statically linked version of busybox
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| 373 | for use as a rescue shell, in the event that you screw up your system.
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| 374 |
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| 375 | This is implemented by re-execing /proc/self/exe (typically)
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| 376 | with right parameters. Some selected applets ("NOFORK" applets)
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| 377 | can even be executed without creating new process.
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| 378 | Instead, busybox will call <applet>_main() internally.
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| 379 |
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| 380 | However, this causes problems in chroot jails without mounted /proc
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| 381 | and with ps/top (command name can be shown as 'exe' for applets
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| 382 | started this way).
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| 383 | # untrue?
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| 384 | # Note that this will *also* cause applets to take precedence
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| 385 | # over shell builtins of the same name. So turning this on will
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| 386 | # eliminate any performance gained by turning on the builtin "echo"
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| 387 | # and "test" commands in ash.
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| 388 | # untrue?
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| 389 | # Note that when using this option, the shell will attempt to directly
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| 390 | # run '/bin/busybox'. If you do not have the busybox binary sitting in
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| 391 | # that exact location with that exact name, this option will not work at
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| 392 | # all.
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| 393 |
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| 394 | config FEATURE_SH_NOFORK
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| 395 | bool "Run 'nofork' applets directly"
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| 396 | default n
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| 397 | depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
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| 398 | help
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| 399 | This option causes busybox shells [currently only ash]
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| 400 | to not execute typical fork/exec/wait sequence, but call <applet>_main
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| 401 | directly, if possible. (Sometimes it is not possible: for example,
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| 402 | this is not possible in pipes).
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| 403 |
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| 404 | This will be done only for some applets (those which are marked
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| 405 | NOFORK in include/applets.h).
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| 406 |
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| 407 | This may significantly speed up some shell scripts.
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| 408 |
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| 409 | This feature is relatively new. Use with care.
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| 410 |
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| 411 | endmenu
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