Cygwin tar1.16.1 - stdout/stdin behaviour on windows

Igor Peshansky pechtcha@cs.nyu.edu
Wed Jul 11 12:31:00 GMT 2007


On Tue, 10 Jul 2007, kavitha Bhasker -X (kbhasker - Infosys@Cisco) wrote:

> Hi,
>
> Iam using the Cygwin Tar version 1.16.1 on an Windows NT Server , I have
> the following dll's copied to the same path as the tar.exe
> From cygwin/1.5.24-2 :       cygiconv-2.dll         cygintl-8.dll
> cygwin1.dll
>
> Iam able to run the command : tar --forcelocal -cvf C:\\temp.tar
> C:\\temp successfully.
>
> However, the program I run , needs to do something more complicated like
> :
>
> 1) tar -cvf - C:\\temp + Use Maverick J2SSH library to SFTP files from
> stdout to stream the tar file to the  SFTP location
>
> and to later restore the files:
>
> 2) Use Maverick J2SSH library to SFTP files to stdin the tar file from
> the  SFTP location + tar -xv -
>
> This works in Linux RH4.0 , when I use the standard /bin/tar . However,
> just does not seem to work on Windows using the Cygwin Tar.exe
>
> Command 1) works and am able to see the tar getting created on the SFTP
> location.
>
> However, am not able to tar -tvf on the file.Just gives blank response.
> I cannot even open the .tar file created using winzip. Says Invalid Tar
> file
>
> Command 2) Just does not see to like stdin and refuses to extract the
> file to the local directory
>
> Please help.Is there any known issue with cygwin tar and stdout/stdin
> behaviour on windows?

Everything Eric said about copying the DLLs being unsupported, the
old version of tar, and about using Win32 paths stands.  Expanding on
that, however, you seem to have omitted the --forcelocal option in your
two non-working examples, which may cause tar to look at a remote
filesystem (and time out, I guess).

I would first try POSIX paths.  If that doesn't help, please look at
<http://cygwin.com/problems.html> for guidelines on reporting Cygwin
problems.  In particular, you might want to clarify the "Just does not see
to like stdin" part (i.e., what exactly happens?), and what the output
looks like for the first command (you *are* running "tar -cvf", after
all).
	Igor
-- 
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