Re: [Qemu-devel] [PATCH] Add new user mode option -ignore-environment

[Stefan Weil <weil@mail.berlios.de>]

Am 16.07.2010 09:04, schrieb Markus Armbruster:
> Stefan Weil<weil@mail.berlios.de>  writes:
>
>    
>> An empty environment is sometimes useful in user mode.
>> The new option provides it for linux-user and bsd-user
>> (darwin-user still has no environment related options).
>>      
> Stupid question: why is /usr/bin/env insufficient?
>
> [...]
>
>    

In most cases it is sufficient (but not always available - Windows...).
The options -U and -E are also redundant and can be replaced by
/usr/bin/env.

But -U and -E exist, so completing the set of environment related
options seems to be logical. The name of the new option was
inspired by /usr/bin/env!

And finally, there is a use case where /usr/bin/env is a bad choice:
just look for "getenv" and you will find one in linux-user/main.c.
Removing the environment via /usr/bin/env will also remove
environment variables which are read by qemu's runtime code.