[U-Boot] [PATCH V2 2/5] fs: implement infra-structure for an 'exists' function

[Stephen Warren]

On 01/26/2014 12:44 PM, Wolfgang Denk wrote:
> Dear Stephen Warren,
> 
> In message <1390507020-15766-2-git-send-email-swarren at wwwdotorg.org> you wrote:
>> From: Stephen Warren <swarren at nvidia.com>
>>
>> This could be used in scripts such as:
>>
>> if exists mmc 0:1 /boot/boot.scr; then
>>     load mmc 0:1 ${scriptaddr} /boot/boot.scr
>>     source ${scriptaddr}
>> fi
> 
> I understand and agree with your intentions, but I dislike to invent a
> new, totally non-standard command.
> 
> In UNIX, we would use the "test" command for such purposes.  Would it
> not make sense to implement this feature in a more compatible way?  we
> have "test", soo, so we should be able to plug it in there?
> 
> What do you think?

I thought that "test -e mmc 0:1 /boot/boot.scr" was different enough
from a regular Unix shell's single-argument path that it would look a
little weird. Still, it works out fine, so I've sent V3 that implements
this via test instead.