[U-Boot] [PATCH 1/4] Add option -r to env import to allow import of text files with CRLF as line endings

[Måns Rullgård]

Alexander Holler <holler at ahsoftware.de> writes:

> Am 03.08.2014 19:51, schrieb Wolfgang Denk:
>> Dear Alexander,
>>
>> In message <53DE658F.5010703 at ahsoftware.de> you wrote:
>>>
>>> Just to clarify: I see uEnv.txt (which only was possible through your
>>> env import implementation) as a read-only configuration file for u-boot,
>>
>> This is just one of the many possible usages.
>>
>>> And I don't think all the necessary stuff to save a file in all the
>>> possible filesystems should end up in u-boot. Modifying filesystems is
>>> dangerous.
>>
>> Thius has nothing to do with exporting an environment.  The export
>> operation and the writing to the file system are two separate steps.
>> If a file system driver contains write support or not depends on the
>> file system code.  For the environment it does not matter.  If we have
>> write support, we just use it.
>>
>>> So from a u-boot point of view uEnv.txt is a read-only mechanism and I'm
>>> happy with it as such.
>>
>> As mentioned, this is but one usage.
>>
>> I think that "env import" / "env export" should be kept symmetric.
>
> Using a \r\n instead of \n when -r is used for env export should be
> something like 4 liner or such.
>
> But it would not be really symmetric. The -r for "env import" makes
> "env import" eat both formats, which means it can be used almost
> always, but using -r with "env export" would be a decision which
> always would be wrong for many people.
>
> Of course, adding the possibility to export the environment in a
> system-foreign format (Assuming nobody boots windows using u-boot)
> doesn't really make a harm, it just adds the danger that people will
> use -r for "env export" because it is used for "env import" too, which
> most likely would be wrong for most usage scenarios.

Why not just make "env import" treat \r like any other whitespace?  It
would be a slight change from current behaviour, but the chance that
someone actually relies on a trailing \r being part of the value is
vanishingly small.

-- 
Måns Rullgård
mans at mansr.com