busybox: add a reworked implementation of menuconfig support, this time with a guard option that keeps all symbols at default values until an extra option is activated

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 39435

1 files changed, 433 insertions, 0 deletions

diff --git a/package/utils/busybox/config/shell/Config.in b/package/utils/busybox/config/shell/Config.in
new file mode 100644
index 0000000000..594675a09e
--- /dev/null
+++ b/package/utils/busybox/config/shell/Config.in
@@ -0,0 +1,433 @@
+# DO NOT EDIT. This file is generated from Config.src
+#
+# For a description of the syntax of this configuration file,
+# see scripts/kbuild/config-language.txt.
+#
+
+menu "Shells"
+
+config BUSYBOX_CONFIG_ASH
+	bool "ash"
+	default BUSYBOX_DEFAULT_ASH
+	depends on !BUSYBOX_CONFIG_NOMMU
+	help
+	  Tha 'ash' shell adds about 60k in the default configuration and is
+	  the most complete and most pedantically correct shell included with
+	  busybox. This shell is actually a derivative of the Debian 'dash'
+	  shell (by Herbert Xu), which was created by porting the 'ash' shell
+	  (written by Kenneth Almquist) from NetBSD.
+
+config BUSYBOX_CONFIG_ASH_BASH_COMPAT
+	bool "bash-compatible extensions"
+	default BUSYBOX_DEFAULT_ASH_BASH_COMPAT
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable bash-compatible extensions.
+
+config BUSYBOX_CONFIG_ASH_IDLE_TIMEOUT
+	bool "Idle timeout variable"
+	default BUSYBOX_DEFAULT_ASH_IDLE_TIMEOUT
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enables bash-like auto-logout after $TMOUT seconds of idle time.
+
+config BUSYBOX_CONFIG_ASH_JOB_CONTROL
+	bool "Job control"
+	default BUSYBOX_DEFAULT_ASH_JOB_CONTROL
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable job control in the ash shell.
+
+config BUSYBOX_CONFIG_ASH_ALIAS
+	bool "Alias support"
+	default BUSYBOX_DEFAULT_ASH_ALIAS
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable alias support in the ash shell.
+
+config BUSYBOX_CONFIG_ASH_GETOPTS
+	bool "Builtin getopt to parse positional parameters"
+	default BUSYBOX_DEFAULT_ASH_GETOPTS
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable support for getopts builtin in ash.
+
+config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO
+	bool "Builtin version of 'echo'"
+	default BUSYBOX_DEFAULT_ASH_BUILTIN_ECHO
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable support for echo builtin in ash.
+
+config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF
+	bool "Builtin version of 'printf'"
+	default BUSYBOX_DEFAULT_ASH_BUILTIN_PRINTF
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable support for printf builtin in ash.
+
+config BUSYBOX_CONFIG_ASH_BUILTIN_TEST
+	bool "Builtin version of 'test'"
+	default BUSYBOX_DEFAULT_ASH_BUILTIN_TEST
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable support for test builtin in ash.
+
+config BUSYBOX_CONFIG_ASH_CMDCMD
+	bool "'command' command to override shell builtins"
+	default BUSYBOX_DEFAULT_ASH_CMDCMD
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable support for the ash 'command' builtin, which allows
+	  you to run the specified command with the specified arguments,
+	  even when there is an ash builtin command with the same name.
+
+config BUSYBOX_CONFIG_ASH_MAIL
+	bool "Check for new mail on interactive shells"
+	default BUSYBOX_DEFAULT_ASH_MAIL
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable "check for new mail" function in the ash shell.
+
+config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE
+	bool "Optimize for size instead of speed"
+	default BUSYBOX_DEFAULT_ASH_OPTIMIZE_FOR_SIZE
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Compile ash for reduced size at the price of speed.
+
+config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT
+	bool "Pseudorandom generator and $RANDOM variable"
+	default BUSYBOX_DEFAULT_ASH_RANDOM_SUPPORT
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  Enable pseudorandom generator and dynamic variable "$RANDOM".
+	  Each read of "$RANDOM" will generate a new pseudorandom value.
+	  You can reset the generator by using a specified start value.
+	  After "unset RANDOM" the generator will switch off and this
+	  variable will no longer have special treatment.
+
+config BUSYBOX_CONFIG_ASH_EXPAND_PRMT
+	bool "Expand prompt string"
+	default BUSYBOX_DEFAULT_ASH_EXPAND_PRMT
+	depends on BUSYBOX_CONFIG_ASH
+	help
+	  "PS#" may contain volatile content, such as backquote commands.
+	  This option recreates the prompt string from the environment
+	  variable each time it is displayed.
+
+config BUSYBOX_CONFIG_CTTYHACK
+	bool "cttyhack"
+	default BUSYBOX_DEFAULT_CTTYHACK
+	help
+	  One common problem reported on the mailing list is the "can't
+	  access tty; job control turned off" error message, which typically
+	  appears when one tries to use a shell with stdin/stdout on
+	  /dev/console.
+	  This device is special - it cannot be a controlling tty.
+
+	  The proper solution is to use the correct device instead of
+	  /dev/console.
+
+	  cttyhack provides a "quick and dirty" solution to this problem.
+	  It analyzes stdin with various ioctls, trying to determine whether
+	  it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
+	  On Linux it also checks sysfs for a pointer to the active console.
+	  If cttyhack is able to find the real console device, it closes
+	  stdin/out/err and reopens that device.
+	  Then it executes the given program. Opening the device will make
+	  that device a controlling tty. This may require cttyhack
+	  to be a session leader.
+
+	  Example for /etc/inittab (for busybox init):
+
+	  ::respawn:/bin/cttyhack /bin/sh
+
+	  Starting an interactive shell from boot shell script:
+
+	  setsid cttyhack sh
+
+	  Giving controlling tty to shell running with PID 1:
+
+	  # exec cttyhack sh
+
+	  Without cttyhack, you need to know exact tty name,
+	  and do something like this:
+
+	  # exec setsid sh -c 'exec sh </dev/tty1 >/dev/tty1 2>&1'
+
+config BUSYBOX_CONFIG_HUSH
+	bool "hush"
+	default BUSYBOX_DEFAULT_HUSH
+	help
+	  hush is a small shell (25k). It handles the normal flow control
+	  constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
+	  case/esac. Redirections, here documents, $((arithmetic))
+	  and functions are supported.
+
+	  It will compile and work on no-mmu systems.
+
+	  It does not handle select, aliases, tilde expansion,
+	  &>file and >&file redirection of stdout+stderr.
+
+config BUSYBOX_CONFIG_HUSH_BASH_COMPAT
+	bool "bash-compatible extensions"
+	default BUSYBOX_DEFAULT_HUSH_BASH_COMPAT
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable bash-compatible extensions.
+
+config BUSYBOX_CONFIG_HUSH_BRACE_EXPANSION
+	bool "Brace expansion"
+	default BUSYBOX_DEFAULT_HUSH_BRACE_EXPANSION
+	depends on BUSYBOX_CONFIG_HUSH_BASH_COMPAT
+	help
+	  Enable {abc,def} extension.
+
+config BUSYBOX_CONFIG_HUSH_HELP
+	bool "help builtin"
+	default BUSYBOX_DEFAULT_HUSH_HELP
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable help builtin in hush. Code size + ~1 kbyte.
+
+config BUSYBOX_CONFIG_HUSH_INTERACTIVE
+	bool "Interactive mode"
+	default BUSYBOX_DEFAULT_HUSH_INTERACTIVE
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable interactive mode (prompt and command editing).
+	  Without this, hush simply reads and executes commands
+	  from stdin just like a shell script from a file.
+	  No prompt, no PS1/PS2 magic shell variables.
+
+config BUSYBOX_CONFIG_HUSH_SAVEHISTORY
+	bool "Save command history to .hush_history"
+	default BUSYBOX_DEFAULT_HUSH_SAVEHISTORY
+	depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE && BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY
+	help
+	  Enable history saving in hush.
+
+config BUSYBOX_CONFIG_HUSH_JOB
+	bool "Job control"
+	default BUSYBOX_DEFAULT_HUSH_JOB
+	depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE
+	help
+	  Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
+	  command (not entire shell), fg/bg builtins work. Without this option,
+	  "cmd &" still works by simply spawning a process and immediately
+	  prompting for next command (or executing next command in a script),
+	  but no separate process group is formed.
+
+config BUSYBOX_CONFIG_HUSH_TICK
+	bool "Process substitution"
+	default BUSYBOX_DEFAULT_HUSH_TICK
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable process substitution `command` and $(command) in hush.
+
+config BUSYBOX_CONFIG_HUSH_IF
+	bool "Support if/then/elif/else/fi"
+	default BUSYBOX_DEFAULT_HUSH_IF
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable if/then/elif/else/fi in hush.
+
+config BUSYBOX_CONFIG_HUSH_LOOPS
+	bool "Support for, while and until loops"
+	default BUSYBOX_DEFAULT_HUSH_LOOPS
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable for, while and until loops in hush.
+
+config BUSYBOX_CONFIG_HUSH_CASE
+	bool "Support case ... esac statement"
+	default BUSYBOX_DEFAULT_HUSH_CASE
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable case ... esac statement in hush. +400 bytes.
+
+config BUSYBOX_CONFIG_HUSH_FUNCTIONS
+	bool "Support funcname() { commands; } syntax"
+	default BUSYBOX_DEFAULT_HUSH_FUNCTIONS
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable support for shell functions in hush. +800 bytes.
+
+config BUSYBOX_CONFIG_HUSH_LOCAL
+	bool "Support local builtin"
+	default BUSYBOX_DEFAULT_HUSH_LOCAL
+	depends on BUSYBOX_CONFIG_HUSH_FUNCTIONS
+	help
+	  Enable support for local variables in functions.
+
+config BUSYBOX_CONFIG_HUSH_RANDOM_SUPPORT
+	bool "Pseudorandom generator and $RANDOM variable"
+	default BUSYBOX_DEFAULT_HUSH_RANDOM_SUPPORT
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  Enable pseudorandom generator and dynamic variable "$RANDOM".
+	  Each read of "$RANDOM" will generate a new pseudorandom value.
+
+config BUSYBOX_CONFIG_HUSH_EXPORT_N
+	bool "Support 'export -n' option"
+	default BUSYBOX_DEFAULT_HUSH_EXPORT_N
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  export -n unexports variables. It is a bash extension.
+
+config BUSYBOX_CONFIG_HUSH_MODE_X
+	bool "Support 'hush -x' option and 'set -x' command"
+	default BUSYBOX_DEFAULT_HUSH_MODE_X
+	depends on BUSYBOX_CONFIG_HUSH
+	help
+	  This instructs hush to print commands before execution.
+	  Adds ~300 bytes.
+
+config BUSYBOX_CONFIG_MSH
+	bool "msh (deprecated: aliased to hush)"
+	default BUSYBOX_DEFAULT_MSH
+	select BUSYBOX_CONFIG_HUSH
+	help
+	  msh is deprecated and will be removed, please migrate to hush.
+
+
+choice
+	prompt "Choose which shell is aliased to 'sh' name"
+	default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
+	help
+	  Choose which shell you want to be executed by 'sh' alias.
+	  The ash shell is the most bash compatible and full featured one.
+
+# note: cannot use "select ASH" here, it breaks "make allnoconfig"
+config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
+	depends on BUSYBOX_CONFIG_ASH
+	bool "ash"
+	depends on !BUSYBOX_CONFIG_NOMMU
+
+config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH
+	depends on BUSYBOX_CONFIG_HUSH
+	bool "hush"
+
+config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE
+	bool "none"
+
+endchoice
+
+choice
+	prompt "Choose which shell is aliased to 'bash' name"
+	default BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
+	help
+	  Choose which shell you want to be executed by 'bash' alias.
+	  The ash shell is the most bash compatible and full featured one.
+
+	  Note that selecting this option does not switch on any bash
+	  compatibility code. It merely makes it possible to install
+	  /bin/bash (sym)link and run scripts which start with
+	  #!/bin/bash line.
+
+	  Many systems use it in scripts which use bash-specific features,
+	  even simple ones like $RANDOM. Without this option, busybox
+	  can't be used for running them because it won't recongnize
+	  "bash" as a supported applet name.
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_ASH
+	depends on BUSYBOX_CONFIG_ASH
+	bool "ash"
+	depends on !BUSYBOX_CONFIG_NOMMU
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_HUSH
+	depends on BUSYBOX_CONFIG_HUSH
+	bool "hush"
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
+	bool "none"
+
+endchoice
+
+
+config BUSYBOX_CONFIG_SH_MATH_SUPPORT
+	bool "POSIX math support"
+	default BUSYBOX_DEFAULT_SH_MATH_SUPPORT
+	depends on BUSYBOX_CONFIG_ASH || BUSYBOX_CONFIG_HUSH
+	help
+	  Enable math support in the shell via $((...)) syntax.
+
+config BUSYBOX_CONFIG_SH_MATH_SUPPORT_64
+	bool "Extend POSIX math support to 64 bit"
+	default BUSYBOX_DEFAULT_SH_MATH_SUPPORT_64
+	depends on BUSYBOX_CONFIG_SH_MATH_SUPPORT
+	help
+	  Enable 64-bit math support in the shell. This will make the shell
+	  slightly larger, but will allow computation with very large numbers.
+	  This is not in POSIX, so do not rely on this in portable code.
+
+config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET
+	bool "Hide message on interactive shell startup"
+	default BUSYBOX_DEFAULT_FEATURE_SH_EXTRA_QUIET
+	depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
+	help
+	  Remove the busybox introduction when starting a shell.
+
+config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE
+	bool "Standalone shell"
+	default BUSYBOX_DEFAULT_FEATURE_SH_STANDALONE
+	depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
+	help
+	  This option causes busybox shells to use busybox applets
+	  in preference to executables in the PATH whenever possible. For
+	  example, entering the command 'ifconfig' into the shell would cause
+	  busybox to use the ifconfig busybox applet. Specifying the fully
+	  qualified executable name, such as '/sbin/ifconfig' will still
+	  execute the /sbin/ifconfig executable on the filesystem. This option
+	  is generally used when creating a statically linked version of busybox
+	  for use as a rescue shell, in the event that you screw up your system.
+
+	  This is implemented by re-execing /proc/self/exe (typically)
+	  with right parameters. Some selected applets ("NOFORK" applets)
+	  can even be executed without creating new process.
+	  Instead, busybox will call <applet>_main() internally.
+
+	  However, this causes problems in chroot jails without mounted /proc
+	  and with ps/top (command name can be shown as 'exe' for applets
+	  started this way).
+# untrue?
+#	  Note that this will *also* cause applets to take precedence
+#	  over shell builtins of the same name. So turning this on will
+#	  eliminate any performance gained by turning on the builtin "echo"
+#	  and "test" commands in ash.
+# untrue?
+#	  Note that when using this option, the shell will attempt to directly
+#	  run '/bin/busybox'. If you do not have the busybox binary sitting in
+#	  that exact location with that exact name, this option will not work at
+#	  all.
+
+config BUSYBOX_CONFIG_FEATURE_SH_NOFORK
+	bool "Run 'nofork' applets directly"
+	default BUSYBOX_DEFAULT_FEATURE_SH_NOFORK
+	depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
+	help
+	  This option causes busybox shells to not execute typical
+	  fork/exec/wait sequence, but call <applet>_main directly,
+	  if possible. (Sometimes it is not possible: for example,
+	  this is not possible in pipes).
+
+	  This will be done only for some applets (those which are marked
+	  NOFORK in include/applets.h).
+
+	  This may significantly speed up some shell scripts.
+
+	  This feature is relatively new. Use with care. Report bugs
+	  to project mailing list.
+
+config BUSYBOX_CONFIG_FEATURE_SH_HISTFILESIZE
+	bool "Use $HISTFILESIZE"
+	default BUSYBOX_DEFAULT_FEATURE_SH_HISTFILESIZE
+	depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
+	help
+	  This option makes busybox shells to use $HISTFILESIZE variable
+	  to set shell history size. Note that its max value is capped
+	  by "History size" setting in library tuning section.
+
+
+endmenu