This is the mail archive of the cygwin mailing list for the Cygwin project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: tar zxvf won't work with Redhat generated compressed tar file

On 04/20/2015 01:10 PM, Joi L. Ellis wrote:
> Note that some flavors of tar don't have a very powerful compression library, and some don't have one at all.  For those old ones you may be forced to use gunzip to get the tarball into a form the old tar understands.  (My ancient CentOS box has it, though.)

GNU tar does NOT use compression libraries; rather, it shells out (via
an equivalent to popen()) to an external program.  If you tell tar which
format a file was compressed in, it should try to use that compression
utility without questions; if you omit the compression format, tar knows
enough magic numbers to shell out to the most common default decompressors.

But one thing that MAY be happening is if a newer gzip is at play.
Upstream has reports of tar failing if $GZIP is set in the environment,
since newer gzip explicitly warns about this setup, and the warning may
interfere with tar's use of the output stream from the resulting

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

Attachment: signature.asc
Description: OpenPGP digital signature

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]