The 'file' command isn't recursive. If you gzip a tar file, it will only say
it's a compressed file, it won't say it's a compressed tar file. See the
example I posted myself earlier in the thread.
I had theorized that the original file is zipped, not gzipped, and perhaps the
tar command is failing for that reason, but I did some tests with that
assumption and it seems tar is able to uncompress a 'zip' format as well as a
'gzip' format.
I really don't have an explanation why tar can't uncompress the file itself,
unless (and this is a wild guess on my part) the method used to copy the file
from RedHat to Cygwin introduced newline format issues (linux \n vs Windows
\r\n). But that doesn't explain to me why manually gunzip before tar works,
while tar alone doesn't.
Is this compressed file under discussion something that can be shared? I think
it will be useful to see if anyone else running 64bit Cygwin (which I am) can
handle that file, or is it an issue limited to this one machine? The Cygwin
packages are usually pretty good about getting dependencies installed
correctly. I asked ldd for a list of library references for tar and gzip, and
neither one referenced libz, which makes me presume they're both statically
linked binaries. If so, it wouldn't matter if libz is installed or not.
$ ldd /usr/bin/tar
ntdll.dll => /cygdrive/c/Windows/SYSTEM32/ntdll.dll (0x7ffe15a90000)
KERNEL32.DLL => /cygdrive/c/Windows/system32/KERNEL32.DLL
(0x7ffe134d0000)
KERNELBASE.dll => /cygdrive/c/Windows/system32/KERNELBASE.dll
(0x7ffe12ff0000)
cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x3fc6d0000)
cygintl-8.dll => /usr/bin/cygintl-8.dll (0x3fad80000)
$ ldd /usr/bin/gzip
ntdll.dll => /cygdrive/c/Windows/SYSTEM32/ntdll.dll (0x7ffe15a90000)
KERNEL32.DLL => /cygdrive/c/Windows/system32/KERNEL32.DLL
(0x7ffe134d0000)
KERNELBASE.dll => /cygdrive/c/Windows/system32/KERNELBASE.dll
(0x7ffe12ff0000)
cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
So, I'm back to asking, how is this file being created on redhat? There are a
multitude of options to tar, and some of them are incompatible with Cygwin, I
think.
-----Original Message-----
From: cygwin-ow...@cygwin.com [mailto:cygwin-ow...@cygwin.com] On Behalf Of
Bertrand Caplet
Sent: Monday, April 20, 2015 14:42
To: cygwin@cygwin.com
Subject: Re: tar zxvf won't work with Redhat generated compressed tar file
> Ran this command on Cygwin64
>
> $file mytar.gz
> mytar.gz: gzip compressed data, from Unix
>
> Did you want me to run this command on Linux?
>
> Thanks
Well as I said it's a gzip archive not a tar + gzip you can't extract it with
tar.
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CHUNKZ.NET - script kiddie and computer technician Bertrand Caplet, Flers (FR)
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