demandimport: ignore pwd and grp.
Both are unavailable under Windows and tarfile detects them via ImportError.
%% no changes%% no changes%% uncompressed contents in repothis is a test%% uncompress our working dir copythis is a test1 files updated, 0 files merged, 0 files removed, 0 files unresolved%% uncompress our new working dir copythis is a test