Fix error reporting from tar extract errors

Mutliple issues here:

* tarfile can throw IOErrors in addition to OSErrors, and both may need
  the filename attribute set
* tarfile needs to be told to raise exceptions for errors, rather than
  ignoring them (errorlevel=1 to the constructor)
* tarfile needs to be told to raise exceptions for tar format corruptions
  and not just I/O errors (errorlevel=2)
* the exception should be re-raised with a plain "raise" instead of "raise e"
  to preserve the stack trace correctly; it's OK to modify the exception
  before re-raising it

Also moved the creating of tf to the rest of the code that sets it up,
for clarity.

I've tested these changes manually, but not written a test case,
since a test case is tricky to write for this.

Originally found by Joe Burmeister.

0 files changed, 0 insertions, 0 deletions