package.loader: catch the EOFError exception in uncompress function

This exception has been seen on staging but we were unfortunately not able to reproduce it. It could be related to underlay storage issues. Here is the traceback:

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/swh/loader/package/loader.py", line 291, in load
  self._load_revision(p_info, origin)
File "/usr/lib/python3/dist-packages/swh/loader/package/loader.py", line 368, in _load_revision
  uncompressed_path = self.uncompress(dl_artifacts, dest=tmpdir)
File "/usr/lib/python3/dist-packages/swh/loader/package/loader.py", line 211, in uncompress
  uncompress(a_path, dest=uncompressed_path)
File "/usr/lib/python3/dist-packages/swh/core/tarball.py", line 72, in uncompress
  shutil.unpack_archive(tarpath, extract_dir=dest)
File "/usr/lib/python3.7/shutil.py", line 999, in unpack_archive
  func(filename, extract_dir, **kwargs)
File "/usr/lib/python3.7/shutil.py", line 934, in _unpack_tarfile
  tarobj.extractall(extract_dir)
File "/usr/lib/python3.7/tarfile.py", line 2002, in extractall
  numeric_owner=numeric_owner)
File "/usr/lib/python3.7/tarfile.py", line 2044, in extract
  numeric_owner=numeric_owner)
File "/usr/lib/python3.7/tarfile.py", line 2114, in _extract_member
  self.makefile(tarinfo, targetpath)
File "/usr/lib/python3.7/tarfile.py", line 2163, in makefile
  copyfileobj(source, target, tarinfo.size, ReadError, bufsize)
File "/usr/lib/python3.7/tarfile.py", line 247, in copyfileobj
  buf = src.read(bufsize)
File "/usr/lib/python3.7/bz2.py", line 178, in read
  return self._buffer.read(size)
File "/usr/lib/python3.7/_compression.py", line 68, in readinto
  data = self.read(len(byte_view))
File "/usr/lib/python3.7/_compression.py", line 99, in read
  raise EOFError("Compressed file ended before the "
EOFError: Compressed file ended before the end-of-stream marker was reached

This happened when decompressing the file https://downloads.sourceforge.net//asio/asio-1.12.1.tar.bz2 but the loader executed locally can decompress it without any issue.

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Migrated from D2859 (view on Phabricator)