shell: clarify help text of CONFIG_{SH,BASH}_IS_* options

Mention the behavior if user selects CONFIG_SH_IS_ASH but not
CONFIG_ASH. We will be explicit that invocations like "busybox ash"
will not work for such configuration.

Also clarify help text of CONFIG_BASH_IS_* that bash compatibility in
ash is not complete. (It shouldn't be anyway - ash can't support every
bash quirk out there.)

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/shell/Config.src b/shell/Config.src
index 7f5f6705078787e4deeebac7b188457bc3146bf3..9bd493fed5677f267c96b3322e831c7882b069f7 100644 (file)
--- a/shell/Config.src
+++ b/shell/Config.src
@@ -17,9 +17,19 @@ choice
 config SH_IS_ASH
        depends on !NOMMU
        bool "ash"
+       help
+         Choose ash to be the shell executed by 'sh' name.
+         The ash code will be built into busybox. If you don't select
+         "ash" choice (CONFIG_ASH), this shell may only be invoked by
+         the name 'sh' (and not 'ash').
 
 config SH_IS_HUSH
        bool "hush"
+       help
+         Choose hush to be the shell executed by 'sh' name.
+         The hush code will be built into busybox. If you don't select
+         "hush" choice (CONFIG_HUSH), this shell may only be invoked by
+         the name 'sh' (and not 'hush').
 
 config SH_IS_NONE
        bool "none"
@@ -31,7 +41,8 @@ choice
        default 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.
+         The ash shell is the most bash compatible and full featured one,
+         although compatibility is far from being complete.
 
          Note that selecting this option does not switch on any bash
          compatibility code. It merely makes it possible to install
@@ -46,9 +57,19 @@ choice
 config BASH_IS_ASH
        depends on !NOMMU
        bool "ash"
+       help
+         Choose ash to be the shell executed by 'bash' name.
+         The ash code will be built into busybox. If you don't select
+         "ash" choice (CONFIG_ASH), this shell may only be invoked by
+         the name 'bash' (and not 'ash').
 
 config BASH_IS_HUSH
        bool "hush"
+       help
+         Choose hush to be the shell executed by 'bash' name.
+         The hush code will be built into busybox. If you don't select
+         "hush" choice (CONFIG_HUSH), this shell may only be invoked by
+         the name 'bash' (and not 'hush').
 
 config BASH_IS_NONE
        bool "none"