[Bug-tar] Failure with --owner and --group when names cannot be mapped to IDs

[Thayne Harbaugh]

If the argument to the --owner or --group option is a name (not an ID) and
it fails look-up on the current system then GNU TAR refuses to create an
archive with the name.  This seems like an artificial failure - it is
conceivable that an archive might be created on a system where a particular
owner or group does not exist and then unpack it elsewhere where the owner
or group does exist.

I noticed that someone else has logged this as a bug:

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=136231

Attached is a patch that allows archives to be created with arbitrary owner
or group names.  I'm more than happy to rework the patch for it to meet any
requirements for merging.

I am not subscribed to the list so please CC me with any comments.

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