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 [EMAIL PROTECTED]
volunteer cygwin tar maintainer
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