blob: e4df35973c1f01d3d550a6dc78cf01b9dfc2c016
1 | # |
2 | # For a description of the syntax of this configuration file, |
3 | # see scripts/kbuild/config-language.txt. |
4 | # |
5 | |
6 | menu "Shells" |
7 | |
8 | INSERT |
9 | |
10 | |
11 | choice |
12 | prompt "Choose which shell is aliased to 'sh' name" |
13 | default FEATURE_SH_IS_ASH |
14 | help |
15 | Choose which shell you want to be executed by 'sh' alias. |
16 | The ash shell is the most bash compatible and full featured one. |
17 | |
18 | # note: cannot use "select ASH" here, it breaks "make allnoconfig" |
19 | config FEATURE_SH_IS_ASH |
20 | depends on ASH |
21 | bool "ash" |
22 | depends on !NOMMU |
23 | |
24 | config FEATURE_SH_IS_HUSH |
25 | depends on HUSH |
26 | bool "hush" |
27 | |
28 | config FEATURE_SH_IS_NONE |
29 | bool "none" |
30 | |
31 | endchoice |
32 | |
33 | choice |
34 | prompt "Choose which shell is aliased to 'bash' name" |
35 | default FEATURE_BASH_IS_NONE |
36 | help |
37 | Choose which shell you want to be executed by 'bash' alias. |
38 | The ash shell is the most bash compatible and full featured one. |
39 | |
40 | Note that selecting this option does not switch on any bash |
41 | compatibility code. It merely makes it possible to install |
42 | /bin/bash (sym)link and run scripts which start with |
43 | #!/bin/bash line. |
44 | |
45 | Many systems use it in scripts which use bash-specific features, |
46 | even simple ones like $RANDOM. Without this option, busybox |
47 | can't be used for running them because it won't recongnize |
48 | "bash" as a supported applet name. |
49 | |
50 | config FEATURE_BASH_IS_ASH |
51 | depends on ASH |
52 | bool "ash" |
53 | depends on !NOMMU |
54 | |
55 | config FEATURE_BASH_IS_HUSH |
56 | depends on HUSH |
57 | bool "hush" |
58 | |
59 | config FEATURE_BASH_IS_NONE |
60 | bool "none" |
61 | |
62 | endchoice |
63 | |
64 | |
65 | config SH_MATH_SUPPORT |
66 | bool "POSIX math support" |
67 | default y |
68 | depends on ASH || HUSH |
69 | help |
70 | Enable math support in the shell via $((...)) syntax. |
71 | |
72 | config SH_MATH_SUPPORT_64 |
73 | bool "Extend POSIX math support to 64 bit" |
74 | default y |
75 | depends on SH_MATH_SUPPORT |
76 | help |
77 | Enable 64-bit math support in the shell. This will make the shell |
78 | slightly larger, but will allow computation with very large numbers. |
79 | This is not in POSIX, so do not rely on this in portable code. |
80 | |
81 | config FEATURE_SH_EXTRA_QUIET |
82 | bool "Hide message on interactive shell startup" |
83 | default y |
84 | depends on HUSH || ASH |
85 | help |
86 | Remove the busybox introduction when starting a shell. |
87 | |
88 | config FEATURE_SH_STANDALONE |
89 | bool "Standalone shell" |
90 | default n |
91 | depends on (HUSH || ASH) |
92 | help |
93 | This option causes busybox shells to use busybox applets |
94 | in preference to executables in the PATH whenever possible. For |
95 | example, entering the command 'ifconfig' into the shell would cause |
96 | busybox to use the ifconfig busybox applet. Specifying the fully |
97 | qualified executable name, such as '/sbin/ifconfig' will still |
98 | execute the /sbin/ifconfig executable on the filesystem. This option |
99 | is generally used when creating a statically linked version of busybox |
100 | for use as a rescue shell, in the event that you screw up your system. |
101 | |
102 | This is implemented by re-execing /proc/self/exe (typically) |
103 | with right parameters. Some selected applets ("NOFORK" applets) |
104 | can even be executed without creating new process. |
105 | Instead, busybox will call <applet>_main() internally. |
106 | |
107 | However, this causes problems in chroot jails without mounted /proc |
108 | and with ps/top (command name can be shown as 'exe' for applets |
109 | started this way). |
110 | # untrue? |
111 | # Note that this will *also* cause applets to take precedence |
112 | # over shell builtins of the same name. So turning this on will |
113 | # eliminate any performance gained by turning on the builtin "echo" |
114 | # and "test" commands in ash. |
115 | # untrue? |
116 | # Note that when using this option, the shell will attempt to directly |
117 | # run '/bin/busybox'. If you do not have the busybox binary sitting in |
118 | # that exact location with that exact name, this option will not work at |
119 | # all. |
120 | |
121 | config FEATURE_SH_NOFORK |
122 | bool "Run 'nofork' applets directly" |
123 | default n |
124 | depends on (HUSH || ASH) |
125 | help |
126 | This option causes busybox shells to not execute typical |
127 | fork/exec/wait sequence, but call <applet>_main directly, |
128 | if possible. (Sometimes it is not possible: for example, |
129 | this is not possible in pipes). |
130 | |
131 | This will be done only for some applets (those which are marked |
132 | NOFORK in include/applets.h). |
133 | |
134 | This may significantly speed up some shell scripts. |
135 | |
136 | This feature is relatively new. Use with care. Report bugs |
137 | to project mailing list. |
138 | |
139 | config FEATURE_SH_HISTFILESIZE |
140 | bool "Use $HISTFILESIZE" |
141 | default y |
142 | depends on HUSH || ASH |
143 | help |
144 | This option makes busybox shells to use $HISTFILESIZE variable |
145 | to set shell history size. Note that its max value is capped |
146 | by "History size" setting in library tuning section. |
147 | |
148 | |
149 | endmenu |
150 |