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Date: Fri, 07 Jul 2006 14:07:14 -0700
From: Linda Walsh <cygwin AT tlinx DOT org>
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Subject: Re: Using du.exe to calculate disk usage on a Microsoft cluster server
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Dave Korn wrote:
>   Still lacking in useful information.  You *still* haven't told us HOW on
> earth you managed to get impossibly long file names, you *still* haven't shown
> us the names of any directories that have failed.
---
	It is quite trivial.  He's prepending either "S:/" or
"/cygdrive/s" to an existing pathname.  The existing pathname can be at the
limit (~256 bytes).  Adding either prefix, above, the pathlen becomes 259 or
267 bytes, respectively.

	Another easy way: cd to directory "/averylongdirnamethathas200chars"
you can create a file in that directory of "maxchars", but when you try
to reference that file from anywhere other than the directory in which it is
located, you'll overflow the pathlen buffer.


>   The answer is the same as before, since you have supplied none of the
> further information which would have allowed a more detailed answer.  You
> might try using a mountpoint to shorten some of the prefix of the overly long
> filenames.  I *still* don't understand how it is possible for your users to
> create files with names that are longer than the maximum filename length that
> windows permits - this is a limitation of the windows OS and filing system,
> not one that cygwin imposes.
---
	A workaround might be using "Find" to find the directories, and execute
the "du -s *" in each directory, and pipe the output through a filter that
does a final concatenation of the current dir + pathname.
> 
>> 2. Has anyone else found a solution which will properly report the
>> amount of disk space a particular directory is occupying? 
---
	I don't think "du" will return the correct value for actual directories.
In other words, on linux, "mkdir t; touch t/a t/b t/c ... t/z" will create
a directory that takes up 4k, but on Windows it still claims it is taking 0k.

linda

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