SHLVL in ash

[Bernhard Reutner-Fischer]

On 2 January 2014 23:03:02 Ron Yorston <rmy at tigress.co.uk> wrote:

> Mike Frysinger wrote:
> >correct.  busybox knows nothing of SHLVL.  it's just another env var to 
> busybox.  so if you set/export/whatever it, then busybox will pass it along 
> unmodified.
>
> In 1.22.0 BusyBox ash does (conditionally) know about SHLVL:
>
> #if ENABLE_ASH_BASH_COMPAT
> 	p = lookupvar("SHLVL");
> 	setvar2("SHLVL", utoa(p ? atoi(p) + 1 : 1));
> #endif
>
> This is supposed to make it compatible with bash.  bash does this:
>
>    [rmy at vulcan ~]$ unset SHLVL
>    [rmy at vulcan ~]$ sh
>    sh-4.2$ echo $SHLVL
>    1
>    sh-4.2$ sh
>    sh-4.2$ echo $SHLVL
>    2
>    sh-4.2$
>
> Because it doesn't export SHLVL BusyBox ash behaves differently:
>
>    [rmy at f14vm busybox]$ unset SHLVL
>    [rmy at f14vm busybox]$ ./sh
>    ~/busybox $ echo $SHLVL
>    1
>    ~/busybox $ ./sh
>    ~/busybox $ echo $SHLVL
>    1
>    ~/busybox $

Did I forget to export it when it was not exported yet?
Patches welcome..
Thanks,

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