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Subject:	Re: [bug] coreutils: potentially dangerous: $(realpath //) != /
To:	cygwin AT cygwin DOT com
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From:	Thomas Wolff <towo AT towo DOT net>
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Date:	Thu, 15 Mar 2018 08:11:44 +0100
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Am 14.03.2018 um 11:58 schrieb Mikhail Usenko via cygwin:
> On Mon, 12 Mar 2018 20:43:13 -0500
> Eric Blake <...> wrote:
>
> ...
>> Just because Linux has taken the stance that their documented definition
>> of // is "synonym for /" does NOT mean that ALL POSIX systems have taken
>> the same approach; Cygwin has taken the approach that "// is documented
>> to be the root of network access points, distinct from /".
>>
>> POSIX allows leeway between implementations; this is one of those
>> documented places where they differ, yet are still both POSIX compliant
>> with their different choices.  If your script is not robust to what
>> POSIX has already warned you about, fix your script.
>>
>>> ...
> If you really claims that Cygwin may and should be different and distinct from all other
> existing POSIX systems (the more so that it is allowed by POSIX),
which is not the case. There are other systems where // is the network root.
> then it would probably be more obvious and clear to say this at the very begining, e.g.
> "Get that Linux feeling (with all those differents and distinctions) - on Windows"
Considering that due to the limitations of being embedded in Windows, 
Cygwin cannot always perfectly mimic either Linux or POSIX systems, I 
personally prefer the more generic approach to define POSIX as its model.
------
Thomas

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