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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Thu, 19 Sep 2002 14:38:03 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Rob Brown <rob AT mp3 DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: df --local
In-Reply-To:	<LMEBLOLOHAGKJEEBFGPKCEFECHAA.rob@mp3.com>
Message-ID:	<Pine.GSO.4.44.0209191429120.15469-100000@slinky.cs.nyu.edu>
MIME-Version:	1.0

On Thu, 19 Sep 2002, Rob Brown wrote:

> I am trying to write a script that checks the % free of local drives using
> df.
>
> $ df -a
> Filesystem           1k-blocks      Used Available Use% Mounted on
> C:\cygwin\bin         19936633   5750854  14185779  29% /usr/bin
> c:\cygwin\lib         19936633   5750854  14185779  29% /usr/lib
> \\server1\rob         961282048 850460672 110821376  89% /rob
> c:\cygwin             19936633   5750854  14185779  29% /
> c:                    19936633   5750854  14185779  29% /cygdrive/c
> d:                      544324    544324         0 100% /cygdrive/d
> u:                   961282048 850460672 110821376  89% /cygdrive/u
>
> The problem is that when I run df --local, I only see remotely mounted
> filesystem:
> $ df --local
> Filesystem           1k-blocks      Used Available Use% Mounted on
> \\server1\rob         961282048 850460672 110821376  89% /rob
>
> Is this a bug? It seems to be opposite of what you would expect.
>
> Also, is there a way to exclude the CDrom drive from the script, since it
> will always show 100%?

Rob,

Yes, this is a porting bug in the fileutils package.  The culprit is this
line (lib/mountlist.h:49):

   # define ME_REMOTE(fs_name, fs_type) (strchr (fs_name, ':') != 0)

which has the exact opposite meaning on Cygwin.  On Cygwin, paths with ":"
are local, of the form "C:\...", whereas paths without ":", of the form
"\\machine\path" are remote.  On Unix systems, local paths have the form
"/dir1/dir2/...", and remote ones are "machine:/dir1/dir2/...".

Hope this helps.  If I have enough time in the next few days, I'll figure
out the proper way to fix this and submit a patch.  A quick workaround
would be

==================================================================
--- mountlist.h     2002-09-19 14:34:31.000000000 -0400
+++ mountlist.h-orig 2000-06-02 07:20:04.000000000 -0400
@@ -46,9 +46,5 @@ struct mount_entry *read_filesystem_list
 #endif

 #ifndef ME_REMOTE
-# ifdef __CYGWIN__
-# define ME_REMOTE(fs_name, fs_type) (strchr (fs_name, ':') == 0)
-# else
 # define ME_REMOTE(fs_name, fs_type) (strchr (fs_name, ':') != 0)
-# endif
 #endif
==================================================================

but this strikes me as a source of potential problems, and probably
shouldn't be used as a final fix.  Perhaps the maintainer of filetutils
could look into it?
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"Water molecules expand as they grow warmer" (C) Popular Science, Oct'02, p.51



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