[Bug-tar] sparse05.at with low disk space causes all later tests to fail

[Nathan Stratton Treadway]

I was running "make check" on tar built from the latest git, and found
that sparse05.at doesn't fail gracefully when my build partition runs
out of space during the test.

Specifically, my partition started out with 2.3G free.  The test tried
to run, and managed to create a BIGFILE 4893794304 bytes in listed size
before the partition filled up... at which point the test failed with:

  ./testsuite: line 1584: echo: write error: No space left on device 
  142. sparse05.at:21: 142. listing sparse files bigger than 2^33 
B(sparse05.at:21): FAILED (sparse05.at:31) 

Unfortunately, after that failure, the BIGFILE is left on the disk, and
all the following tests also fail with "no space left on device"
messages.

I will try to run the tests again with more space, but I wonder if there
is some way for sparse05.at to fail more gracefully in this situation.


                                                        Nathan


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