Mail Archives: cygwin/2006/02/20/12:39:42
On Mon, 20 Feb 2006, Eric Blake wrote:
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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).
>
Thanks for the explanation. It makes some sense once you realize a pipe is
involved, but from a user standpoint it seems wrong for tar to try to do
any conversions to the data. I agree that nobinmode is problematic. I
considered using it because a bunch of my cshell scripts broke with the
latest version of sed, which it started passing Ctrl-M's piped to it
from program output. Setting nobinmode was a potential workaround,
but I decided it was better just to fix the scripts to filter the
Ctrl-M's.
>>
>> 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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