Re: [Help-tar] Trouble with tar -xzf when using --files-from=-

[Reuti]

Tony:

> Am 21.10.2015 um 14:30 schrieb Tony Olekshy <address@hidden>:
> 
> Tony Olekshy wrote, on 2015-10-20 at 19:20 MDT:
>> 
>> Hello.
>> 
>> I'm having trouble understanding why I can't pipe the output of a
>> tar -tzf a.tgz ... through to a tar -xzf a.tgz --files=from=- ...
>> without producing what appear to be spurious messages. In practice
>> I want to place a filter in that pipeline to select just what to
>> extract, but the following script simplifies that out to just show
>> the problem I'm encountering.
> 
> Reuti wrote, on 2015-10-21 at 04:32 MDT:
>> 
>> Accessing "." in the archive will move its pointer already to
>> the end:
>> 
>> $ echo . | tar tf archive.tgz --files-from=-
>> ./
>> ./foo/
>> ./foo/bar
> 
> Reuti wrote, on 2015-10-21 at 05:10 MDT:
>> 
>> Ah, although I missed the --no-recursion at the first glance: its
>> position is important. It must appear before the --files-from=- in
>> your case.
> 
> Perfect, that did it. The attached script with the --no-recursion
> placed before the --files-from=- does exactly what I'm looking for,
> and I've tested it with a filter between the tar -t and the tar -x
> (a simple head -2 works for this testing), and it all works well.
> 
> Thank you very much for you assistance with this matter, Reuti. Now
> I understand the difference between tar's globally scoped options &
> those that only apply to succeeding arguments.

A short question: did you test your script also with 1.28? While it is working 
in 1.26 now, I get the impression that in 1.28:

1) --files-from must be an exact match, hence --no-recursion has no meaning for 
it now

2) Due to 1), plain directories can't be extracted with --files-from any 
longer, only on the command line:

$ cat lister
./foo/
$ local/tar-1.28/bin/tar --list --file=test/archive.tgz --files-from=lister
local/tar-1.28/bin/tar: ./foo/: Not found in archive
local/tar-1.28/bin/tar: Exiting with failure status due to previous errors
$ local/tar-1.28/bin/tar --list --file=test/archive.tgz ./foo/
./foo/
./foo/bar
$ local/tar-1.28/bin/tar --list --file=test/archive.tgz --no-recursion ./foo/
./foo/

Can you confirm this?

-- Reuti