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https://github.com/sheumann/hush.git
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380 lines
11 KiB
Plaintext
380 lines
11 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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choice
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prompt "Choose your default shell"
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default FEATURE_SH_IS_NONE
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help
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Choose a shell. The ash shell is the most bash compatible
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and full featured one.
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config FEATURE_SH_IS_ASH
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select 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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select HUSH
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bool "hush"
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####config FEATURE_SH_IS_LASH
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#### select LASH
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#### bool "lash"
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####config FEATURE_SH_IS_MSH
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#### select MSH
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#### bool "msh"
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config FEATURE_SH_IS_NONE
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bool "none"
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endchoice
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config ASH
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bool "ash"
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default n
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depends on !NOMMU
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help
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Tha 'ash' shell adds about 60k in the default configuration and is
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the most complete and most pedantically correct shell included with
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busybox. This shell is actually a derivative of the Debian 'dash'
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shell (by Herbert Xu), which was created by porting the 'ash' shell
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(written by Kenneth Almquist) from NetBSD.
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config ASH_BASH_COMPAT
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bool "bash-compatible extensions"
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default y
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depends on ASH
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help
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Enable bash-compatible extensions.
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config ASH_JOB_CONTROL
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bool "Job control"
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default y
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depends on ASH
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help
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Enable job control in the ash shell.
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config ASH_READ_NCHARS
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bool "'read -n N' and 'read -s' support"
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default n
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depends on ASH
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help
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'read -n N' will return a value after N characters have been read.
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'read -s' will read without echoing the user's input.
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config ASH_READ_TIMEOUT
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bool "'read -t S' support"
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default n
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depends on ASH
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help
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'read -t S' will return a value after S seconds have passed.
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This implementation will allow fractional seconds, expressed
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as a decimal fraction, e.g. 'read -t 2.5 foo'.
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config ASH_ALIAS
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bool "alias support"
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default y
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depends on ASH
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help
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Enable alias support in the ash shell.
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config ASH_GETOPTS
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bool "Builtin getopt to parse positional parameters"
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default n
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depends on ASH
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help
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Enable getopts builtin in the ash shell.
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config ASH_BUILTIN_ECHO
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bool "Builtin version of 'echo'"
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default y
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depends on ASH
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help
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Enable support for echo, builtin to ash.
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config ASH_BUILTIN_PRINTF
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bool "Builtin version of 'printf'"
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default y
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depends on ASH
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help
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Enable support for printf, builtin to ash.
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config ASH_BUILTIN_TEST
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bool "Builtin version of 'test'"
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default y
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depends on ASH
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help
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Enable support for test, builtin to ash.
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config ASH_CMDCMD
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bool "'command' command to override shell builtins"
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default n
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depends on ASH
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help
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Enable support for the ash 'command' builtin, which allows
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you to run the specified command with the specified arguments,
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even when there is an ash builtin command with the same name.
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config ASH_MAIL
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bool "Check for new mail on interactive shells"
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default y
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depends on ASH
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help
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Enable "check for new mail" in the ash shell.
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config ASH_OPTIMIZE_FOR_SIZE
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bool "Optimize for size instead of speed"
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default y
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depends on ASH
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help
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Compile ash for reduced size at the price of speed.
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config ASH_RANDOM_SUPPORT
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bool "Pseudorandom generator and $RANDOM variable"
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default n
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depends on ASH
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help
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Enable pseudorandom generator and dynamic variable "$RANDOM".
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Each read of "$RANDOM" will generate a new pseudorandom value.
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You can reset the generator by using a specified start value.
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After "unset RANDOM" the generator will switch off and this
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variable will no longer have special treatment.
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config ASH_EXPAND_PRMT
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bool "Expand prompt string"
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default n
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depends on ASH
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help
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"PS#" may contain volatile content, such as backquote commands.
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This option recreates the prompt string from the environment
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variable each time it is displayed.
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config HUSH
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bool "hush"
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default n
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help
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hush is a small shell (22k). It handles the normal flow control
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constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
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case/esac. Redirections, here documents, $((arithmetic))
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and functions are supported.
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It will compile and work on no-mmu systems.
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It does not handle select, aliases, brace expansion,
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tilde expansion, &>file and >&file redirection of stdout+stderr.
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config HUSH_BASH_COMPAT
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bool "bash-compatible extensions"
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default y
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depends on HUSH
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help
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Enable bash-compatible extensions.
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config HUSH_HELP
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bool "help builtin"
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default n
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depends on HUSH
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help
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Enable help builtin in hush. Code size + ~1 kbyte.
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config HUSH_INTERACTIVE
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bool "Interactive mode"
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default y
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depends on HUSH
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help
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Enable interactive mode (prompt and command editing).
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Without this, hush simply reads and executes commands
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from stdin just like a shell script from a file.
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No prompt, no PS1/PS2 magic shell variables.
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config HUSH_JOB
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bool "Job control"
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default n
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depends on HUSH_INTERACTIVE
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help
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Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
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command (not entire shell), fg/bg builtins work. Without this option,
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"cmd &" still works by simply spawning a process and immediately
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prompting for next command (or executing next command in a script),
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but no separate process group is formed.
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config HUSH_TICK
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bool "Process substitution"
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default n
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depends on HUSH
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help
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Enable process substitution `command` and $(command) in hush.
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config HUSH_IF
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bool "Support if/then/elif/else/fi"
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default n
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depends on HUSH
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help
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Enable if/then/elif/else/fi in hush.
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config HUSH_LOOPS
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bool "Support for, while and until loops"
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default n
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depends on HUSH
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help
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Enable for, while and until loops in hush.
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config HUSH_CASE
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bool "Support case ... esac statement"
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default n
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depends on HUSH
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help
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Enable case ... esac statement in hush. +400 bytes.
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config HUSH_FUNCTIONS
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bool "Support funcname() { commands; } syntax"
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default n
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depends on HUSH
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help
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Enable support for shell functions in hush. +800 bytes.
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config HUSH_LOCAL
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bool "Support local builtin"
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default n
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depends on HUSH_FUNCTIONS
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help
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Enable support for local variables in functions.
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config HUSH_EXPORT_N
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bool "Support export '-n' option"
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default n
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depends on HUSH
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help
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Enable support for export '-n' option in hush. It is a bash extension.
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config HUSH_RANDOM_SUPPORT
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bool "Pseudorandom generator and $RANDOM variable"
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default n
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depends on HUSH
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help
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Enable pseudorandom generator and dynamic variable "$RANDOM".
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Each read of "$RANDOM" will generate a new pseudorandom value.
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config LASH
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bool "lash (deprecated: aliased to hush)"
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default n
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select HUSH
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help
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lash is deprecated and will be removed, please migrate to hush.
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config MSH
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bool "msh (deprecated: please use hush)"
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default n
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select HUSH
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help
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msh is deprecated and will be removed, please migrate to hush.
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If there is a feature msh has but hush does not, please let us know.
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# The minix shell (adds just 30k) is quite complete and handles things
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# like for/do/done, case/esac and all the things you expect a Bourne
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# shell to do. It is not always pedantically correct about Bourne
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# shell grammar (try running the shell testscript "tests/sh.testcases"
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# on it and compare vs bash) but for most things it works quite well.
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# It uses only vfork, so it can be used on uClinux systems.
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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 n
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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 n
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depends on MSH || LASH || 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 (MSH || LASH || 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 (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
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help
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This option causes busybox shells [currently only ash]
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to not execute typical fork/exec/wait sequence, but call <applet>_main
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directly, 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.
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config CTTYHACK
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bool "cttyhack"
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default n
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help
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One common problem reported on the mailing list is "can't access tty;
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job control turned off" error message which typically appears when
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one tries to use shell with stdin/stdout opened to /dev/console.
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This device is special - it cannot be a controlling tty.
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Proper solution is to use correct device instead of /dev/console.
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cttyhack provides "quick and dirty" solution to this problem.
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It analyzes stdin with various ioctls, trying to determine whether
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it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
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If it detects one, it closes stdin/out/err and reopens that device.
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Then it executes given program. Usage example for /etc/inittab
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(for busybox init):
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::respawn:/bin/cttyhack /bin/sh
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endmenu
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