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>

1 files changed, 22 insertions, 1 deletions

diff --git a/shell/Config.src b/shell/Config.src
index 7f5f67050..9bd493fed 100644
--- 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"