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Date:	Mon, 20 Feb 2006 10:13:02 -0700
From:	Eric Blake <ebb9 AT byu DOT net>
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To:	David Mastronarde <mast AT colorado DOT edu>
CC:	cygwin AT cygwin DOT com
Subject:	Re: tar fails with some combinations of line ending and binmode setting
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According to David Mastronarde on 2/18/2006 10:55 PM:
> 
> With CYGWIN set to binmode, tar fails on the archive of DOS files
> created under nobinmode.
> 
> With CYGWIN set to nobinmode, tar fails on the archives of DOS files
> created under either mode.
> 
> This happens on both a Windows 2000 machine with cygwin 1.5.19-4 and
> a Windows XP machine with 1.5.18-1.
> 
> In fact, the archive of DOS files created under nobinmode must be bad
> since it fails to untar under Linux and OSX also.  All the other
> archives are OK by this test.

Well, nobinmode is documented as opening pipes in text mode
(http://cygwin.com/cygwin-ug-net/using-cygwinenv.html), and tar uses a
pipe to the compression program, so I'm not surprised (text mode has the
nasty habit of corrupting binary data, and tar uses binary data).  I
personally never use nobinmode (making pipes non-binary is just ASKING for
problems, as you just proved), but I will see about trying to pinpoint yet
one more location in tar where I should consider forcing binary mode.  But
don't expect it to be my highest priority - you should be using binmode
(or nothing at all, since $CYGWIN defaults to binmode).

> 
> tar                  1.15.1-2

BTW, tar is at 1.15.1-3, consider upgrading (although it won't help for
your particular testcase).

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
volunteer cygwin tar maintainer
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