Contents of /tags/mkinitrd-6_2_2/busybox/shell/Config.in
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Sun May 30 12:33:03 2010 UTC (14 years, 3 months ago) by niro
File size: 10318 byte(s)
Sun May 30 12:33:03 2010 UTC (14 years, 3 months ago) by niro
File size: 10318 byte(s)
tagged 'mkinitrd-6_2_2'
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 | choice |
9 | prompt "Choose your default shell" |
10 | default FEATURE_SH_IS_NONE |
11 | help |
12 | Choose a shell. The ash shell is the most bash compatible |
13 | and full featured one. |
14 | |
15 | config FEATURE_SH_IS_ASH |
16 | select ASH |
17 | bool "ash" |
18 | depends on !NOMMU |
19 | |
20 | config FEATURE_SH_IS_HUSH |
21 | select HUSH |
22 | bool "hush" |
23 | |
24 | ####config FEATURE_SH_IS_LASH |
25 | #### select LASH |
26 | #### bool "lash" |
27 | |
28 | ####config FEATURE_SH_IS_MSH |
29 | #### select MSH |
30 | #### bool "msh" |
31 | |
32 | config FEATURE_SH_IS_NONE |
33 | bool "none" |
34 | |
35 | endchoice |
36 | |
37 | config ASH |
38 | bool "ash" |
39 | default n |
40 | depends on !NOMMU |
41 | help |
42 | Tha 'ash' shell adds about 60k in the default configuration and is |
43 | the most complete and most pedantically correct shell included with |
44 | busybox. This shell is actually a derivative of the Debian 'dash' |
45 | shell (by Herbert Xu), which was created by porting the 'ash' shell |
46 | (written by Kenneth Almquist) from NetBSD. |
47 | |
48 | config ASH_BASH_COMPAT |
49 | bool "bash-compatible extensions" |
50 | default y |
51 | depends on ASH |
52 | help |
53 | Enable bash-compatible extensions. |
54 | |
55 | config ASH_JOB_CONTROL |
56 | bool "Job control" |
57 | default y |
58 | depends on ASH |
59 | help |
60 | Enable job control in the ash shell. |
61 | |
62 | config ASH_ALIAS |
63 | bool "alias support" |
64 | default y |
65 | depends on ASH |
66 | help |
67 | Enable alias support in the ash shell. |
68 | |
69 | config ASH_GETOPTS |
70 | bool "Builtin getopt to parse positional parameters" |
71 | default n |
72 | depends on ASH |
73 | help |
74 | Enable getopts builtin in the ash shell. |
75 | |
76 | config ASH_BUILTIN_ECHO |
77 | bool "Builtin version of 'echo'" |
78 | default y |
79 | depends on ASH |
80 | help |
81 | Enable support for echo, builtin to ash. |
82 | |
83 | config ASH_BUILTIN_PRINTF |
84 | bool "Builtin version of 'printf'" |
85 | default y |
86 | depends on ASH |
87 | help |
88 | Enable support for printf, builtin to ash. |
89 | |
90 | config ASH_BUILTIN_TEST |
91 | bool "Builtin version of 'test'" |
92 | default y |
93 | depends on ASH |
94 | help |
95 | Enable support for test, builtin to ash. |
96 | |
97 | config ASH_CMDCMD |
98 | bool "'command' command to override shell builtins" |
99 | default n |
100 | depends on ASH |
101 | help |
102 | Enable support for the ash 'command' builtin, which allows |
103 | you to run the specified command with the specified arguments, |
104 | even when there is an ash builtin command with the same name. |
105 | |
106 | config ASH_MAIL |
107 | bool "Check for new mail on interactive shells" |
108 | default y |
109 | depends on ASH |
110 | help |
111 | Enable "check for new mail" in the ash shell. |
112 | |
113 | config ASH_OPTIMIZE_FOR_SIZE |
114 | bool "Optimize for size instead of speed" |
115 | default y |
116 | depends on ASH |
117 | help |
118 | Compile ash for reduced size at the price of speed. |
119 | |
120 | config ASH_RANDOM_SUPPORT |
121 | bool "Pseudorandom generator and $RANDOM variable" |
122 | default n |
123 | depends on ASH |
124 | help |
125 | Enable pseudorandom generator and dynamic variable "$RANDOM". |
126 | Each read of "$RANDOM" will generate a new pseudorandom value. |
127 | You can reset the generator by using a specified start value. |
128 | After "unset RANDOM" the generator will switch off and this |
129 | variable will no longer have special treatment. |
130 | |
131 | config ASH_EXPAND_PRMT |
132 | bool "Expand prompt string" |
133 | default n |
134 | depends on ASH |
135 | help |
136 | "PS#" may contain volatile content, such as backquote commands. |
137 | This option recreates the prompt string from the environment |
138 | variable each time it is displayed. |
139 | |
140 | config HUSH |
141 | bool "hush" |
142 | default n |
143 | help |
144 | hush is a small shell (22k). It handles the normal flow control |
145 | constructs such as if/then/elif/else/fi, for/in/do/done, while loops, |
146 | case/esac. Redirections, here documents, $((arithmetic)) |
147 | and functions are supported. |
148 | |
149 | It will compile and work on no-mmu systems. |
150 | |
151 | It does not handle select, aliases, brace expansion, |
152 | tilde expansion, &>file and >&file redirection of stdout+stderr. |
153 | |
154 | config HUSH_BASH_COMPAT |
155 | bool "bash-compatible extensions" |
156 | default y |
157 | depends on HUSH |
158 | help |
159 | Enable bash-compatible extensions. |
160 | |
161 | config HUSH_HELP |
162 | bool "help builtin" |
163 | default n |
164 | depends on HUSH |
165 | help |
166 | Enable help builtin in hush. Code size + ~1 kbyte. |
167 | |
168 | config HUSH_INTERACTIVE |
169 | bool "Interactive mode" |
170 | default y |
171 | depends on HUSH |
172 | help |
173 | Enable interactive mode (prompt and command editing). |
174 | Without this, hush simply reads and executes commands |
175 | from stdin just like a shell script from a file. |
176 | No prompt, no PS1/PS2 magic shell variables. |
177 | |
178 | config HUSH_JOB |
179 | bool "Job control" |
180 | default n |
181 | depends on HUSH_INTERACTIVE |
182 | help |
183 | Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current |
184 | command (not entire shell), fg/bg builtins work. Without this option, |
185 | "cmd &" still works by simply spawning a process and immediately |
186 | prompting for next command (or executing next command in a script), |
187 | but no separate process group is formed. |
188 | |
189 | config HUSH_TICK |
190 | bool "Process substitution" |
191 | default n |
192 | depends on HUSH |
193 | help |
194 | Enable process substitution `command` and $(command) in hush. |
195 | |
196 | config HUSH_IF |
197 | bool "Support if/then/elif/else/fi" |
198 | default n |
199 | depends on HUSH |
200 | help |
201 | Enable if/then/elif/else/fi in hush. |
202 | |
203 | config HUSH_LOOPS |
204 | bool "Support for, while and until loops" |
205 | default n |
206 | depends on HUSH |
207 | help |
208 | Enable for, while and until loops in hush. |
209 | |
210 | config HUSH_CASE |
211 | bool "Support case ... esac statement" |
212 | default n |
213 | depends on HUSH |
214 | help |
215 | Enable case ... esac statement in hush. +400 bytes. |
216 | |
217 | config HUSH_FUNCTIONS |
218 | bool "Support funcname() { commands; } syntax" |
219 | default n |
220 | depends on HUSH |
221 | help |
222 | Enable support for shell functions in hush. +800 bytes. |
223 | |
224 | config HUSH_LOCAL |
225 | bool "Support local builtin" |
226 | default n |
227 | depends on HUSH_FUNCTIONS |
228 | help |
229 | Enable support for local variables in functions. |
230 | |
231 | config HUSH_EXPORT_N |
232 | bool "Support export '-n' option" |
233 | default n |
234 | depends on HUSH |
235 | help |
236 | Enable support for export '-n' option in hush. It is a bash extension. |
237 | |
238 | config HUSH_RANDOM_SUPPORT |
239 | bool "Pseudorandom generator and $RANDOM variable" |
240 | default n |
241 | depends on HUSH |
242 | help |
243 | Enable pseudorandom generator and dynamic variable "$RANDOM". |
244 | Each read of "$RANDOM" will generate a new pseudorandom value. |
245 | |
246 | config LASH |
247 | bool "lash (deprecated: aliased to hush)" |
248 | default n |
249 | select HUSH |
250 | help |
251 | lash is deprecated and will be removed, please migrate to hush. |
252 | |
253 | config MSH |
254 | bool "msh (deprecated: please use hush)" |
255 | default n |
256 | select HUSH |
257 | help |
258 | msh is deprecated and will be removed, please migrate to hush. |
259 | If there is a feature msh has but hush does not, please let us know. |
260 | |
261 | # The minix shell (adds just 30k) is quite complete and handles things |
262 | # like for/do/done, case/esac and all the things you expect a Bourne |
263 | # shell to do. It is not always pedantically correct about Bourne |
264 | # shell grammar (try running the shell testscript "tests/sh.testcases" |
265 | # on it and compare vs bash) but for most things it works quite well. |
266 | # It uses only vfork, so it can be used on uClinux systems. |
267 | |
268 | |
269 | config SH_MATH_SUPPORT |
270 | bool "POSIX math support" |
271 | default y |
272 | depends on ASH || HUSH |
273 | help |
274 | Enable math support in the shell via $((...)) syntax. |
275 | |
276 | config SH_MATH_SUPPORT_64 |
277 | bool "Extend POSIX math support to 64 bit" |
278 | default n |
279 | depends on SH_MATH_SUPPORT |
280 | help |
281 | Enable 64-bit math support in the shell. This will make the shell |
282 | slightly larger, but will allow computation with very large numbers. |
283 | This is not in POSIX, so do not rely on this in portable code. |
284 | |
285 | config FEATURE_SH_EXTRA_QUIET |
286 | bool "Hide message on interactive shell startup" |
287 | default n |
288 | depends on MSH || LASH || HUSH || ASH |
289 | help |
290 | Remove the busybox introduction when starting a shell. |
291 | |
292 | config FEATURE_SH_STANDALONE |
293 | bool "Standalone shell" |
294 | default n |
295 | depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS |
296 | help |
297 | This option causes busybox shells to use busybox applets |
298 | in preference to executables in the PATH whenever possible. For |
299 | example, entering the command 'ifconfig' into the shell would cause |
300 | busybox to use the ifconfig busybox applet. Specifying the fully |
301 | qualified executable name, such as '/sbin/ifconfig' will still |
302 | execute the /sbin/ifconfig executable on the filesystem. This option |
303 | is generally used when creating a statically linked version of busybox |
304 | for use as a rescue shell, in the event that you screw up your system. |
305 | |
306 | This is implemented by re-execing /proc/self/exe (typically) |
307 | with right parameters. Some selected applets ("NOFORK" applets) |
308 | can even be executed without creating new process. |
309 | Instead, busybox will call <applet>_main() internally. |
310 | |
311 | However, this causes problems in chroot jails without mounted /proc |
312 | and with ps/top (command name can be shown as 'exe' for applets |
313 | started this way). |
314 | # untrue? |
315 | # Note that this will *also* cause applets to take precedence |
316 | # over shell builtins of the same name. So turning this on will |
317 | # eliminate any performance gained by turning on the builtin "echo" |
318 | # and "test" commands in ash. |
319 | # untrue? |
320 | # Note that when using this option, the shell will attempt to directly |
321 | # run '/bin/busybox'. If you do not have the busybox binary sitting in |
322 | # that exact location with that exact name, this option will not work at |
323 | # all. |
324 | |
325 | config FEATURE_SH_NOFORK |
326 | bool "Run 'nofork' applets directly" |
327 | default n |
328 | depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS |
329 | help |
330 | This option causes busybox shells [currently only ash] |
331 | to not execute typical fork/exec/wait sequence, but call <applet>_main |
332 | directly, if possible. (Sometimes it is not possible: for example, |
333 | this is not possible in pipes). |
334 | |
335 | This will be done only for some applets (those which are marked |
336 | NOFORK in include/applets.h). |
337 | |
338 | This may significantly speed up some shell scripts. |
339 | |
340 | This feature is relatively new. Use with care. |
341 | |
342 | config CTTYHACK |
343 | bool "cttyhack" |
344 | default n |
345 | help |
346 | One common problem reported on the mailing list is "can't access tty; |
347 | job control turned off" error message which typically appears when |
348 | one tries to use shell with stdin/stdout opened to /dev/console. |
349 | This device is special - it cannot be a controlling tty. |
350 | |
351 | Proper solution is to use correct device instead of /dev/console. |
352 | |
353 | cttyhack provides "quick and dirty" solution to this problem. |
354 | It analyzes stdin with various ioctls, trying to determine whether |
355 | it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line). |
356 | If it detects one, it closes stdin/out/err and reopens that device. |
357 | Then it executes given program. Usage example for /etc/inittab |
358 | (for busybox init): |
359 | |
360 | ::respawn:/bin/cttyhack /bin/sh |
361 | |
362 | endmenu |