path: root/Config.in

#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#

mainmenu "BusyBox Configuration"

config HAVE_DOT_CONFIG
	bool
	default y

menu "Busybox Settings"

config DESKTOP
	bool "Enable options for full-blown desktop systems"
	default y
	help
	  Enable options and features which are not essential.
	  Select this if you plan to use busybox on full-blown desktop machine
	  with common Linux distro, which needs higher level of command-line
	  compatibility.

	  If you are preparing your build to be used on an embedded box
	  where you have tighter control over the entire set of userspace
	  tools, you can unselect this option for smaller code size.

config EXTRA_COMPAT
	bool "Provide compatible behavior for rare corner cases (bigger code)"
	default n
	help
	  This option makes grep, sed etc handle rare corner cases
	  (embedded NUL bytes and such). This makes code bigger and uses
	  some GNU extensions in libc. You probably only need this option
	  if you plan to run busybox on desktop.

config INCLUDE_SUSv2
	bool "Enable obsolete features removed before SUSv3"
	default y
	help
	  This option will enable backwards compatibility with SuSv2,
	  specifically, old-style numeric options ('command -1 <file>')
	  will be supported in head, tail, and fold. (Note: should
	  affect renice too.)

config USE_PORTABLE_CODE
	bool "Avoid using GCC-specific code constructs"
	default n
	help
	  Use this option if you are trying to compile busybox with
	  compiler other than gcc.
	  If you do use gcc, this option may needlessly increase code size.

config SHOW_USAGE
	bool "Show applet usage messages"
	default y
	help
	  Enabling this option, BusyBox applets will show terse help messages
	  when invoked with wrong arguments.
	  If you do not want to show any (helpful) usage message when
	  issuing wrong command syntax, you can say 'N' here,
	  saving approximately 7k.

config FEATURE_VERBOSE_USAGE
	bool "Show verbose applet usage messages"
	default y
	depends on SHOW_USAGE
	help
	  All BusyBox applets will show verbose help messages when
	  busybox is invoked with --help. This will add a lot of text to the
	  busybox binary. In the default configuration, this will add about
	  13k, but it can add much more depending on your configuration.

config FEATURE_COMPRESS_USAGE
	bool "Store applet usage messages in compressed form"
	default y
	depends on SHOW_USAGE
	help
	  Store usage messages in .bz compressed form, uncompress them
	  on-the-fly when <applet> --help is called.

	  If you have a really tiny busybox with few applets enabled (and
	  bunzip2 isn't one of them), the overhead of the decompressor might
	  be noticeable. Also, if you run executables directly from ROM
	  and have very little memory, this might not be a win. Otherwise,
	  you probably want this.

config BUSYBOX
	bool "Include busybox applet"
	default y
	help
	  The busybox applet provides general help regarding busybox and
	  allows the included applets to be listed.  It's also required
	  if applet links are to be installed at runtime. If you unselect
	  this option, running busybox without any arguments will give
	  just a cryptic error message:

	  $ busybox
	  busybox: applet not found

	  Running "busybox APPLET [ARGS...]" will still work, of course.

config FEATURE_INSTALLER
	bool "Support --install [-s] to install applet links at runtime"
	default y
	depends on BUSYBOX
	help
	  Enable 'busybox --install [-s]' support. This will allow you to use
	  busybox at runtime to create hard links or symlinks for all the
	  applets that are compiled into busybox.

config INSTALL_NO_USR
	bool "Don't use /usr"
	default n
	help
	  Disable use of /usr. busybox --install and "make install"
	  will install applets only to /bin and /sbin,
	  never to /usr/bin or /usr/sbin.

config LFS
	bool "Build with Large File Support (for accessing files > 2 GB)"
	default y
	help
	  If you want to build BusyBox with large file support, then enable
	  this option. This will have no effect if your kernel or your C
	  library lacks large file support for large files. Some of the
	  programs that can benefit from large file support include dd, gzip,
	  cp, mount, tar, and many others. If you want to access files larger
	  than 2 Gigabytes, enable this option. Otherwise, leave it set to 'N'.

config PAM
	bool "Support PAM (Pluggable Authentication Modules)"
	default n
	help
	  Use PAM in some busybox applets (currently login and httpd) instead
	  of direct access to password database.

config LONG_OPTS
	bool "Support --long-options"
	default y
	help
	  Enable this if you want busybox applets to use the gnu --long-option
	  style, in addition to single character -a -b -c style options.

config FEATURE_DEVPTS
	bool "Use the devpts filesystem for Unix98 PTYs"
	default y
	help
	  Enable if you want BusyBox to use Unix98 PTY support. If enabled,
	  busybox will use /dev/ptmx for the master side of the pseudoterminal
	  and /dev/pts/<number> for the slave side. Otherwise, BSD style
	  /dev/ttyp<number> will be used. To use this option, you should have
	  devpts mounted.

config FEATURE_UTMP
	bool "Support utmp file"
	default y
	help
	  The file /var/run/utmp is used to track who is currently logged in.
	  With this option on, certain applets (getty, login, telnetd etc)
	  will create and delete entries there.
	  "who" applet requires this option.

config FEATURE_WTMP
	bool "Support wtmp file"
	default y
	depends on FEATURE_UTMP
	help
	  The file /var/run/wtmp is used to track when users have logged into
	  and logged out of the system.
	  With this option on, certain applets (getty, login, telnetd etc)
	  will append new entries there.
	  "last" applet requires this option.

config FEATURE_PIDFILE
	bool "Support writing pidfiles"
	default y
	help
	  This option makes some applets (e.g. crond, syslogd, inetd) write
	  a pidfile at the configured PID_FILE_PATH.  It has no effect
	  on applets which require pidfiles to run.

config PID_FILE_PATH
	string "Directory for pidfiles"
	default "/var/run"
	depends on FEATURE_PIDFILE
	help
	  This is the default path where pidfiles are created.  Applets which
	  allow you to set the pidfile path on the command line will override
	  this value.  The option has no effect on applets that require you to
	  specify a pidfile path.

config FEATURE_SUID
	bool "Support SUID/SGID handling"
	default y
	help
	  With this option you can install the busybox binary belonging
	  to root with the suid bit set, enabling some applets to perform
	  root-level operations even when run by ordinary users
	  (for example, mounting of user mounts in fstab needs this).

	  Busybox will automatically drop privileges for applets
	  that don't need root access.

	  If you are really paranoid and don't want to do this, build two
	  busybox binaries with different applets in them (and the appropriate
	  symlinks pointing to each binary), and only set the suid bit on the
	  one that needs it.

	  The applets which require root rights (need suid bit or
	  to be run by root) and will refuse to execute otherwise:
	  crontab, login, passwd, su, vlock, wall.

	  The applets which will use root rights if they have them
	  (via suid bit, or because run by root), but would try to work
	  without root right nevertheless:
	  findfs, ping[6], traceroute[6], mount.

	  Note that if you DONT select this option, but DO make busybox
	  suid root, ALL applets will run under root, which is a huge
	  security hole (think "cp /some/file /etc/passwd").

config FEATURE_SUID_CONFIG
	bool "Runtime SUID/SGID configuration via /etc/busybox.conf"
	default y
	depends on FEATURE_SUID
	help
	  Allow the SUID / SGID state of an applet to be determined at runtime
	  by checking /etc/busybox.conf. (This is sort of a poor man's sudo.)
	  The format of this file is as follows:

	  APPLET = [Ssx-][Ssx-][x-] [USER.GROUP]

	  s: USER or GROUP is allowed to execute APPLET.
	     APPLET will run under USER or GROUP
	     (reagardless of who's running it).
	  S: USER or GROUP is NOT allowed to execute APPLET.
	     APPLET will run under USER or GROUP.
	     This option is not very sensical.
	  x: USER/GROUP/others are allowed to execute APPLET.
	     No UID/GID change will be done when it is run.
	  -: USER/GROUP/others are not allowed to execute APPLET.

	  An example might help:

	  [SUID]
	  su = ssx root.0 # applet su can be run by anyone and runs with
	                  # euid=0/egid=0
	  su = ssx        # exactly the same

	  mount = sx- root.disk # applet mount can be run by root and members
	                        # of group disk (but not anyone else)
	                        # and runs with euid=0 (egid is not changed)

	  cp = --- # disable applet cp for everyone

	  The file has to be owned by user root, group root and has to be
	  writeable only by root:
	        (chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf)
	  The busybox executable has to be owned by user root, group
	  root and has to be setuid root for this to work:
	        (chown 0.0 /bin/busybox; chmod 4755 /bin/busybox)

	  Robert 'sandman' Griebl has more information here:
	  <url: http://www.softforge.de/bb/suid.html >.

config FEATURE_SUID_CONFIG_QUIET
	bool "Suppress warning message if /etc/busybox.conf is not readable"
	default y
	depends on FEATURE_SUID_CONFIG
	help
	  /etc/busybox.conf should be readable by the user needing the SUID,
	  check this option to avoid users to be notified about missing
	  permissions.

config FEATURE_PREFER_APPLETS
	bool "exec prefers applets"
	default n
	help
	  This is an experimental option which directs applets about to
	  call 'exec' to try and find an applicable busybox applet before
	  searching the PATH. This is typically done by exec'ing
	  /proc/self/exe.
	  This may affect shell, find -exec, xargs and similar applets.
	  They will use applets even if /bin/<applet> -> busybox link
	  is missing (or is not a link to busybox). 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).

config BUSYBOX_EXEC_PATH
	string "Path to BusyBox executable"
	default "/proc/self/exe"
	help
	  When Busybox applets need to run other busybox applets, BusyBox
	  sometimes needs to exec() itself. When the /proc filesystem is
	  mounted, /proc/self/exe always points to the currently running
	  executable. If you haven't got /proc, set this to wherever you
	  want to run BusyBox from.

config SELINUX
	bool "Support NSA Security Enhanced Linux"
	default n
	select PLATFORM_LINUX
	help
	  Enable support for SELinux in applets ls, ps, and id. Also provide
	  the option of compiling in SELinux applets.

	  If you do not have a complete SELinux userland installed, this stuff
	  will not compile.  Specifially, libselinux 1.28 or better is
	  directly required by busybox. If the installation is located in a
	  non-standard directory, provide it by invoking make as follows:
		CFLAGS=-I<libselinux-include-path> \
		LDFLAGS=-L<libselinux-lib-path> \
		make

	  Most people will leave this set to 'N'.

config FEATURE_CLEAN_UP
	bool "Clean up all memory before exiting (usually not needed)"
	default n
	help
	  As a size optimization, busybox normally exits without explicitly
	  freeing dynamically allocated memory or closing files. This saves
	  space since the OS will clean up for us, but it can confuse debuggers
	  like valgrind, which report tons of memory and resource leaks.

	  Don't enable this unless you have a really good reason to clean
	  things up manually.

# These are auto-selected by other options

config FEATURE_SYSLOG
	bool #No description makes it a hidden option
	default n
	#help
	#  This option is auto-selected when you select any applet which may
	#  send its output to syslog. You do not need to select it manually.

config FEATURE_HAVE_RPC
	bool #No description makes it a hidden option
	default n
	#help
	#  This is automatically selected if any of enabled applets need it.
	#  You do not need to select it manually.

config PLATFORM_LINUX
	bool #No description makes it a hidden option
	default n
	#help
	#  For the most part, busybox requires only POSIX compatibility
	#  from the target system, but some applets and features use
	#  Linux-specific interfaces.
	#
	#  This is automatically selected if any applet or feature requires
	#  Linux-specific interfaces. You do not need to select it manually.

comment 'Build Options'

config STATIC
	bool "Build BusyBox as a static binary (no shared libs)"
	default n
	help
	  If you want to build a static BusyBox binary, which does not
	  use or require any shared libraries, then enable this option.
	  This can cause BusyBox to be considerably larger, so you should
	  leave this option false unless you have a good reason (i.e.
	  your target platform does not support shared libraries, or
	  you are building an initrd which doesn't need anything but
	  BusyBox, etc).

	  Most people will leave this set to 'N'.

config PIE
	bool "Build BusyBox as a position independent executable"
	default n
	depends on !STATIC
	help
	  Hardened code option. PIE binaries are loaded at a different
	  address at each invocation. This has some overhead,
	  particularly on x86-32 which is short on registers.

	  Most people will leave this set to 'N'.

config NOMMU
	bool "Force NOMMU build"
	default n
	help
	  Busybox tries to detect whether architecture it is being
	  built against supports MMU or not. If this detection fails,
	  or if you want to build NOMMU version of busybox for testing,
	  you may force NOMMU build here.

	  Most people will leave this set to 'N'.

# PIE can be made to work with BUILD_LIBBUSYBOX, but currently
# build system does not support that
config BUILD_LIBBUSYBOX
	bool "Build shared libbusybox"
	default n
	depends on !FEATURE_PREFER_APPLETS && !PIE && !STATIC
	help
	  Build a shared library libbusybox.so.N.N.N which contains all
	  busybox code.

	  This feature allows every applet to be built as a really tiny
	  separate executable linked against the library:
	  $ size 0_lib/l*
	    text  data   bss     dec    hex filename
	     939   212    28    1179    49b 0_lib/last
	     939   212    28    1179    49b 0_lib/less
	  919138  8328  1556  929022  e2cfe 0_lib/libbusybox.so.1.N.M

	  This is useful on NOMMU systems which are not capable
	  of sharing executables, but are capable of sharing code
	  in dynamic libraries.

config FEATURE_LIBBUSYBOX_STATIC
	bool "Pull in all external references into libbusybox"
	default n
	depends on BUILD_LIBBUSYBOX
	help
	  Make libbusybox library independent, not using or requiring
	  any other shared libraries.

config FEATURE_INDIVIDUAL
	bool "Produce a binary for each applet, linked against libbusybox"
	default y
	depends on BUILD_LIBBUSYBOX
	help
	  If your CPU architecture doesn't allow for sharing text/rodata
	  sections of running binaries, but allows for runtime dynamic
	  libraries, this option will allow you to reduce memory footprint
	  when you have many different applets running at once.

	  If your CPU architecture allows for sharing text/rodata,
	  having single binary is more optimal.

	  Each applet will be a tiny program, dynamically linked
	  against libbusybox.so.N.N.N.

	  You need to have a working dynamic linker.

config FEATURE_SHARED_BUSYBOX
	bool "Produce additional busybox binary linked against libbusybox"
	default y
	depends on BUILD_LIBBUSYBOX
	help
	  Build busybox, dynamically linked against libbusybox.so.N.N.N.

	  You need to have a working dynamic linker.

### config BUILD_AT_ONCE
###	bool "Compile all sources at once"
###	default n
###	help
###	  Normally each source-file is compiled with one invocation of
###	  the compiler.
###	  If you set this option, all sources are compiled at once.
###	  This gives the compiler more opportunities to optimize which can
###	  result in smaller and/or faster binaries.
###
###	  Setting this option will consume alot of memory, e.g. if you
###	  enable all applets with all features, gcc uses more than 300MB
###	  RAM during compilation of busybox.
###
###	  This option is most likely only beneficial for newer compilers
###	  such as gcc-4.1 and above.
###
###	  Say 'N' unless you know what you are doing.

config CROSS_COMPILER_PREFIX
	string "Cross Compiler prefix"
	default ""
	help
	  If you want to build BusyBox with a cross compiler, then you
	  will need to set this to the cross-compiler prefix, for example,
	  "i386-uclibc-".

	  Note that CROSS_COMPILE environment variable or
	  "make CROSS_COMPILE=xxx ..." will override this selection.

	  Native builds leave this empty.

config SYSROOT
	string "Path to sysroot"
	default ""
	help
	  If you want to build BusyBox with a cross compiler, then you
	  might also need to specify where /usr/include and /usr/lib
	  will be found.

	  For example, BusyBox can be built against an installed
	  Android NDK, platform version 9, for ARM ABI with

	  CONFIG_SYSROOT=/opt/android-ndk/platforms/android-9/arch-arm

	  Native builds leave this empty.

config EXTRA_CFLAGS
	string "Additional CFLAGS"
	default ""
	help
	  Additional CFLAGS to pass to the compiler verbatim.

config EXTRA_LDFLAGS
	string "Additional LDFLAGS"
	default ""
	help
	  Additional LDFLAGS to pass to the linker verbatim.

config EXTRA_LDLIBS
	string "Additional LDLIBS"
	default ""
	help
	  Additional LDLIBS to pass to the linker with -l.

comment 'Installation Options ("make install" behavior)'

choice
	prompt "What kind of applet links to install"
	default INSTALL_APPLET_SYMLINKS
	help
	  Choose what kind of links to applets are created by "make install".

config INSTALL_APPLET_SYMLINKS
	bool "as soft-links"
	help
	  Install applets as soft-links to the busybox binary. This needs some
	  free inodes on the filesystem, but might help with filesystem
	  generators that can't cope with hard-links.

config INSTALL_APPLET_HARDLINKS
	bool "as hard-links"
	help
	  Install applets as hard-links to the busybox binary. This might
	  count on a filesystem with few inodes.

config INSTALL_APPLET_SCRIPT_WRAPPERS
	bool "as script wrappers"
	help
	  Install applets as script wrappers that call the busybox binary.

config INSTALL_APPLET_DONT
	bool "not installed"
	help
	  Do not install applet links. Useful when you plan to use
	  busybox --install for installing links, or plan to use
	  a standalone shell and thus don't need applet links.

endchoice

choice
	prompt "/bin/sh applet link"
	default INSTALL_SH_APPLET_SYMLINK
	depends on INSTALL_APPLET_SCRIPT_WRAPPERS
	help
	  Choose how you install /bin/sh applet link.

config INSTALL_SH_APPLET_SYMLINK
	bool "as soft-link"
	help
	  Install /bin/sh applet as soft-link to the busybox binary.

config INSTALL_SH_APPLET_HARDLINK
	bool "as hard-link"
	help
	  Install /bin/sh applet as hard-link to the busybox binary.

config INSTALL_SH_APPLET_SCRIPT_WRAPPER
	bool "as script wrapper"
	help
	  Install /bin/sh applet as script wrapper that calls
	  the busybox binary.

endchoice

config PREFIX
	string "BusyBox installation prefix"
	default "./_install"
	help
	  Define your directory to install BusyBox files/subdirs in.

comment 'Debugging Options'

config DEBUG
	bool "Build BusyBox with extra Debugging symbols"
	default n
	help
	  Say Y here if you wish to examine BusyBox internals while applets are
	  running. This increases the size of the binary considerably, and
	  should only be used when doing development. If you are doing
	  development and want to debug BusyBox, answer Y.

	  Most people should answer N.

config DEBUG_PESSIMIZE
	bool "Disable compiler optimizations"
	default n
	depends on DEBUG
	help
	  The compiler's optimization of source code can eliminate and reorder
	  code, resulting in an executable that's hard to understand when
	  stepping through it with a debugger. This switches it off, resulting
	  in a much bigger executable that more closely matches the source
	  code.

config DEBUG_SANITIZE
	bool "Enable runtime sanitizers (ASAN/LSAN/USAN/etc...)"
	default n
	help
	  Say Y here if you want to enable runtime sanitizers. These help
	  catch bad memory accesses (e.g. buffer overflows), but will make
	  the executable larger and slow down runtime a bit.

	  This adds -fsanitize=foo options to gcc command line.

	  If you aren't developing/testing busybox, say N here.

config UNIT_TEST
	bool "Build unit tests"
	default n
	help
	  Say Y here if you want to build unit tests (both the framework and
	  test cases) as a Busybox applet. This results in bigger code, so you
	  probably don't want this option in production builds.

config WERROR
	bool "Abort compilation on any warning"
	default n
	help
	  This adds -Werror to gcc command line.

	  Most people should answer N.

choice
	prompt "Additional debugging library"
	default NO_DEBUG_LIB
	help
	  Using an additional debugging library will make BusyBox become
	  considerable larger and will cause it to run more slowly. You
	  should always leave this option disabled for production use.

	  dmalloc support:
	  ----------------
	  This enables compiling with dmalloc ( http://dmalloc.com/ )
	  which is an excellent public domain mem leak and malloc problem
	  detector. To enable dmalloc, before running busybox you will
	  want to properly set your environment, for example:
	    export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile
	  The 'debug=' value is generated using the following command
	    dmalloc -p log-stats -p log-non-free -p log-bad-space \
	       -p log-elapsed-time -p check-fence -p check-heap \
	       -p check-lists -p check-blank -p check-funcs -p realloc-copy \
	       -p allow-free-null

	  Electric-fence support:
	  -----------------------
	  This enables compiling with Electric-fence support. Electric
	  fence is another very useful malloc debugging library which uses
	  your computer's virtual memory hardware to detect illegal memory
	  accesses. This support will make BusyBox be considerable larger
	  and run slower, so you should leave this option disabled unless
	  you are hunting a hard to find memory problem.


config NO_DEBUG_LIB
	bool "None"

config DMALLOC
	bool "Dmalloc"

config EFENCE
	bool "Electric-fence"

endchoice

source libbb/Config.in

endmenu

comment "Applets"

source archival/Config.in
source coreutils/Config.in
source console-tools/Config.in
source debianutils/Config.in
source editors/Config.in
source findutils/Config.in
source init/Config.in
source loginutils/Config.in
source e2fsprogs/Config.in
source modutils/Config.in
source util-linux/Config.in
source miscutils/Config.in
source networking/Config.in
source printutils/Config.in
source mailutils/Config.in
source procps/Config.in
source runit/Config.in
source selinux/Config.in
source shell/Config.in
source sysklogd/Config.in