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From: Fedin Pavel <p DOT fedin AT samsung DOT com>
To: cygwin AT cygwin DOT com
References: <000201ce52c4$891b04c0$9b510e40$%fedin AT samsung DOT com> <20130517083612 DOT GE21752 AT calimero DOT vinschen DOT de> <000d01ce52dc$74e54bb0$5eafe310$%fedin AT samsung DOT com> <20130517102655 DOT GG21752 AT calimero DOT vinschen DOT de> <20130517145612 DOT GC7087 AT ednor DOT casa DOT cgf DOT cx>
In-reply-to: <20130517145612.GC7087@ednor.casa.cgf.cx>
Subject: RE: BUG: Ability to access nonexistent directories
Date: Mon, 20 May 2013 15:53:16 +0400
Message-id: <001a01ce5550$9e20afd0$da620f70$%fedin@samsung.com>
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 Hello!

> >>  Heh...
> >>  So, complete emulation would cost a major performance drop, right ?
> >>  Well... Can there be any setting which enables these checks ? At
> least we have one use case...
> >
> >Not without lots of new code.
> 
> So, maybe next Thursday?

 By the way, you said it would be slow... I have an idea how to implement a
compromise solution which would not be horribly slow.
 What if we check existence of intermediate paths not every time but only
when we meet thing like '..' ?
 I'll explain... For example, if we would access /foo/bar/baz, testing for
/foo and /foo/bar existence would supposedly be a waste of time, because we
would get "Object not found" on the final path too. But, when processing
thing like /foo/bar/../baz, we really need to check for intermediate dirs.
But, still not every time. In this example we actually need to test only for
/foo/bar's existence. I. e. a path to which we apply '..', before stripping
the last component.
 Does it make sense ?

 Kind regards.


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