gtar: update to 1.30

version 1.30 - Sergey Poznyakoff, 2017-12-17

* Member names containing '..' components are now skipped when extracting.

This fixes tar's behavior to match its documentation, and is a bit
safer when extracting untrusted archives over old files (an unsafe
practice that the tar manual has long recommended against).

* Report erroneous use of position-sensitive options.

During archive creation or update, tar keeps track of positional
options (see the manual, subsection 3.4.4 "Position-Sensitive
Options"), and reports those that had no effect.  For example, when
invoked as

  tar -cf a.tar . --exclude '*.o'

tar will create the archive, but will exit with status 2, having
issued the following error message

  tar: The following options were used after non-optional
  arguments in archive create or update mode.  These options are
  positional and affect only arguments that follow them.  Please,
  rearrange them properly.
  tar: --exclude '*.o' has no effect
  tar: Exiting with failure status due to previous errors

* --numeric-owner now affects private headers too.

This helps the output of 'tar' to be more deterministic.

* Fixed the --delay-directory-restore option

In some cases tar would restore the directory permissions too early,
causing subsequent link extractions in that directory to fail.

* The --warnings=failed-read option

This new warning control option suppresses warning messages about
unreadable files and directories. It has effect only if used together
with the --ignore-failed-read option.

* The --warnings=none option now suppresses all warnings

This includes warnings about unreadable files produced when
--ignore-failed-read is in effect. To output these, use
--warnings=none --warnings=no-failed-read.

* Fix reporting of hardlink mismatches during compare

Tar reported incorrect target file name in the 'Not linked to'
diagnostic message.

(wiz)