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Date: Wed, 13 Jun 2018 15:50:36 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <183057486.20180613155036@yandex.ru>
To: "Sven Eden" <sven DOT eden AT gmx DOT de>, cygwin AT cygwin DOT com
Subject: Re: Problematic interpretion of paths starting with double slashes
In-Reply-To: <trinity-709441a4-b53d-4bbd-96fb-91ad85816938-1528878894364@3c-app-gmx-bs06>
References: <trinity-82173dac-d842-4a87-8d1f-bed9a958d178-1528793630066 AT 3c-app-gmx-bs08>   <dc8418d2-2004-97f0-2d8c-ab438f007eba AT redhat DOT com>  <trinity-2aa37c55-032a-4631-9d8f-657ecd85e170-1528809265158 AT 3c-app-gmx-bs08>  <00de90b8-a2b4-f751-1ef2-05645a3f1119 AT SystematicSw DOT ab DOT ca>  <trinity-709441a4-b53d-4bbd-96fb-91ad85816938-1528878894364 AT 3c-app-gmx-bs06>
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Greetings, Sven Eden!

>> Gesendet: Dienstag, 12. Juni 2018 um 18:28 Uhr
>> Von: "Brian Inglis" <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
>> On 2018-06-12 07:14, Sven Eden wrote:
>> >> Gesendet: Dienstag, 12. Juni 2018 um 13:52 Uhr
>> >> Von: "Eric Blake" <eblake AT redhat DOT com>
>> >> Then fix your script to provide 3 slashes instead of 2. Only 2 slashes
>> >> has the magic UNC behavior.
>> > It is not my script. *my* scripts are portable by all means.
>> >> That is, if you have a script that is concatenating:
>> >> ${prefix}/${dir}
>> >> where ${prefix} might be empty, you can always rewrite it to be:
>> >> ${prefix}///${dir}
>> > The script was "fixed" from ${prefix}/${dir} a while ago. Before that the
>> > outcome was "///". Which is very bad style. Good style is to guarantee, that
>> > not more than one slash is issued.
>>
>> Which is equivalent to //localhost/ on Cygwin and elsewhere - / on Linux - this
>> is semantics not "style".

> I talked about replacing something wrong with something
> worse. That's style, not semantics. But I get what you are
> meaning. ;-)

If it is documented, it is not wrong.


> However, from my two questions, one was answered, and I can
> figure out the other just fine by myself.

> Q: Can the handling of // be extended to check for / if the
> first fails?
> A: Yes

Can? Yes. Purely technically. But for consistency it will not be.
Ambiguous paths are a big no-no.


-- 
With best regards,
Andrey Repin
Wednesday, June 13, 2018 15:48:59

Sorry for my terrible english...


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