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bash has a concept of "loadables", which are "plugins" that can be
loaded at runtime by bash to add new builtin. For example:
# type whoami
whoami is hashed (/usr/bin/whoami)
# whoami
root
# enable -f /usr/lib/bash/whoami whoami
# type whoami
whoami is a shell builtin
# whoami
root
# enable -d whoami
# type whoami
whoami is hashed (/usr/bin/whoami)
# whoami
root
bash comes with a set of example loadables, installed in
/usr/lib/bash/. They take 312 KB on ARM32, and are by default not
used, and provide builtins that are for the most part already
available as external commands in Busybox/coreutils:
Makefile.inc finfo mkfifo realpath sync
accept head mktemp rm tee
basename id mypid rmdir truefalse
csv ln pathchk seq tty
cut loadables.h print setpgid uname
dirname logname printenv sleep unlink
fdflags mkdir push strftime whoami
So instead of having them unconditionally installed, add an option to
enable/disable their installation (their build apparently cannot be
disabled via a configure option).
Normally, we try to keep backward compatibility by preserving the
existing behavior. In this case, this would have meant making this
option "default y". But this also breaks our principle of "being
minimal by default", and in this case, it feels preferable to be
"minimal by default" than preserving existing behavior.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
26 lines
666 B
Plaintext
26 lines
666 B
Plaintext
config BR2_PACKAGE_BASH
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bool "bash"
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# uses fork()
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depends on BR2_USE_MMU
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depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
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select BR2_PACKAGE_NCURSES
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select BR2_PACKAGE_READLINE
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help
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The standard GNU Bourne again shell.
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http://tiswww.case.edu/php/chet/bash/bashtop.html
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if BR2_PACKAGE_BASH
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config BR2_PACKAGE_BASH_LOADABLE_EXAMPLES
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bool "loadable examples"
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depends on !BR2_STATIC_LIBS
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help
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This option will enable the installation of the "loadable"
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examples, which are dynamically loadable extension providing
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additional built-ins commands to bash. There are typically
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not needed as they are provided as regular, external
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commands.
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endif
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