change folder heirarchy in a tar file without extracting to disk

[Jerome Yanga]

Is there a way to change the folder structure inside a tar file without extracting it to disk first?

For example, I have the following file/folder structure in a tar file, test.tar.

dir1/
dir1/file1
dir1/file2

I would like the contents to be modified to.

dir2/dir1/
dir2/dir1/file1
dir2/dir1/file2

Thank you in advance.

[Richard W.M. Jones]

On Thu, Oct 06, 2016 at 03:08:53PM -0000, [e-mail] wrote:
> Is there a way to change the folder structure inside a tar file without extracting it to disk first?
>
> For example, I have the following file/folder structure in a tar file, test.tar.
>
> dir1/
> dir1/file1
> dir1/file2
>
> I would like the contents to be modified to.
>
> dir2/dir1/
> dir2/dir1/file1
> dir2/dir1/file2
>
> Thank you in advance.

libarchive can probably do this kind of thing.  Some coding required
however ...

By far the easiest way would be to accept that you need to unpack it
to disk.

Rich.

[fred roller]

On Thu, Oct 6, 2016 at 5:57 PM, Richard W.M. Jones 
wrote:
> On Thu, Oct 06, 2016 at 03:08:53PM -0000, [e-mail] wrote:
> > Is there a way to change the folder structure inside a tar file without
>
> extracting it to disk first?
> > For example, I have the following file/folder structure in a tar file,
>
> test.tar.
> > dir1/
> > dir1/file1
> > dir1/file2
> >
> > I would like the contents to be modified to.
> >
> > dir2/dir1/
> > dir2/dir1/file1
> > dir2/dir1/file2
> >
> > Thank you in advance.
>
> libarchive can probably do this kind of thing.  Some coding required
> however ...
>
> By far the easiest way would be to accept that you need to unpack it
> to disk.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
> rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
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> bindings from many languages.  http://libguestfs.org
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Try this...

mkdir dir2

add it to archive via built-in archive software, in my case archive manager
for gnome.  You should have both dir1 and dir2 in archive.  Right click
dir1 and chose cut.  Navigate into dir2 and paste.

I created directory "test1" and then:

touch test1/file1
touch test1/file2

creating two files in test1.  In the file manager I chose to "create
archive" then did the above successfully thus restructuring the archive
without extraction.  Mileage may vary. HTH.

-- Fred