[Octave-bug-tracker] [bug #52095] tar, untar, and unpack errors and incorrect output when TAR_OPTIONS in environment

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?52095>

                 Summary: tar, untar, and unpack errors and incorrect output
when TAR_OPTIONS in environment
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Fri 22 Sep 2017 04:30:54 PM PDT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

If the user environment variable TAR_OPTIONS is present containing options to
pass to the GNU tar command, it may make the tar, untar, and unpack functions
fail or output weird results.

For example


>> test tar
PASSES 6 out of 6 tests
>> setenv TAR_OPTIONS --create
>> test tar
unpack: unarchiving program exited with status: 2
tar: You may not specify more than one '-Acdtrux', '--delete' or 
'--test-label' option
Try 'tar --help' or 'tar --usage' for more information.
PASSES 5 out of 6 tests (1 known failure)


or


>> a = tar ("foo.tar", "foo.txt")
a =
{
  [1,1] = foo.txt
}

>> b = untar ("foo.tar")
b =
{
  [1,1] = foo.txt
}

>> setenv TAR_OPTIONS --verbose
>> a = tar ("foo.tar", "foo.txt")
a =
{
  [1,1] = -rw-r----- mike/mike         3 2017-09-22 16:27 foo.txt
}

>> b = untar ("foo.tar")
b =
{
  [1,1] = -rw-r----- mike/mike         3 2017-09-22 16:27 foo.txt
}



In these functions, Octave is parsing the output of the tar command and
expecting it to behave in very specific ways, so I think it would be best to
clear and restore the value of TAR_OPTIONS.




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