2862ae0 ostree-installer: Use Python function to copy

Authored and Committed by lsedlar 5 years ago
    ostree-installer: Use Python function to copy
    
    This should give us better error reporting. The `copy_all` function
    should preserve permissions on all files.
    
    Relates: https://pagure.io/pungi/issue/932
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>