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Date:	Fri, 08 Jan 2010 21:41:19 +0100
From:	Christian Franke <Christian DOT Franke AT t-online DOT de>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Update problems
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Larry Hall (Cygwin) wrote:
> On 01/07/2010 09:39 PM, David Gast wrote:
>> There are two problems with updating cygwin.
>>
>> 1. If you run setup.exe from bash, bash cannot be updated
>> because the file is in use.
>
> Sure.  This is the reason 'setup.exe' exists.  It's a Windows
> "feature" that keeps you from replacing a file that's in use.
> 'setup.exe' was created to provide a native Windows program
> to avoid the problem of something like 'setup.exe' needing to
> update files that are in use by it.  If it were possible to
> replace files in use with the same ease as on Linux, say,
> then 'setup.exe' would never be needed since things like
> rpm, yum, and apt, to name a few, could be used directly
> to install and update Cygwin.

Cygwin 1.7 actually allows to replace an executable which is still in use:
http://cygwin.com/ml/cygwin/2009-12/msg00423.html

Christian


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