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Date:      26 Sep 2001 20:30:41 -0000
From:      mark@summersault.com
To:        FreeBSD-gnats-submit@freebsd.org
Subject:   bin/30850: prevent tar from creating empty tar files in some cases
Message-ID:  <20010926203041.66436.qmail@nollie.summersault.com>

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>Number:         30850
>Category:       bin
>Synopsis:       prevent tar from creating empty tar files in some cases
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 26 13:40:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Mark Stosberg
>Release:        FreeBSD 4.3-RELEASE i386
>Organization:
Summersault, LLC
>Environment:
System: FreeBSD nollie.summersault.com 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Wed May 9 16:03:58 EST 2001 root@esperanza.summersault.com:/usr/src/sys/compile/NOLLIE.050901 i386

>Description:
I would like for the tar binary to prevent the creation of empty tar files when no files are specified to tar up. Here's my "use case": I just downloaded a big tar, gzipped file and want to unpack it. I use: tar -czvf bigfile.tgz
Oops, I just clobbered my file instead of opening it, despite having not specified 
any files to put in this new archive. 
>How-To-Repeat:
tar -czvf test.tgz
>Fix:
Here's now GNU tar handles this, which I like better:

$ tar -czvf tmp.tgz
tar: Cowardly refusing to create an empty archive
Try `tar --help' for more information.

Perhaps I'm overlooking a good reason to support the ability to create empty archives. 
Thanks, -mark 
>Release-Note:
>Audit-Trail:
>Unformatted:

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