Re: 1.7] Can you have multipe cygdrive path prefixes active at once

[Jeremy Bopp <jeremy at bopp dot net>]

Larry Hall (Cygwin) wrote:
> On 11/06/2009 05:35 PM, Jeremy Bopp wrote:
>> Thrall, Bryan wrote:
>>> Jeremy Bopp wrote on Friday, November 06, 2009 3:31 PM:
>>>> Well, it's a bit of a hack, but you could try something like the
>>> following:
>>>> $ dirname $(cygpath -u C:/)
>>>>
>>>> This assumes that there is always a C: drive and converts the path to
>>>> the root of that drive into a POSIX path which will include the
>>> cygdrive
>>>> prefix.  Then dirname is used to effectively chop off the drive letter
>>>> leaving you with the cygdrive prefix.
>>>
>>> Actually:
>>>
>>> $ ls /cygdrive
>>> c  e  f  h  j  p  t  z
>>> $ cygpath -u x:/
>>> /cygdrive/x
>>>
>>> Seems like you aren't assuming the drive exists :)
>>
>> That's pretty sweet, but that feature seems to be fairly fortuitous
>> rather than by design.  Maybe someone could speak on this point with
>> more authority.
> 
> If you need to know what the cygdrive prefix is, you're much better off
> asking 'mount' directly.  I know it's a little more parsing but getting it
> directly rather than trying back doors is far more reliable.

The concern posed by the instigator of this thread is that it can't be
known from the output of "mount -p" whether or not the spaces which
follow the listed cygdrive prefix are part of the prefix or padding for
the outputted columns.  It should be pretty rare that someone
intentionally uses trailing spaces in their cygdrive prefix, but I can
understand the desire for robustness.

I suppose parsing the output of "mount -m" could yield a definitive
result, but there the risk is that the output could change subtly and
break simple parsing.

-Jeremy

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