4bd1e75 Avoid to upload a file with different checksum

Authored and Committed by cqi 5 years ago
    Avoid to upload a file with different checksum
    
    The problem is, upload is able to upload a file, which is already in
    sources with different checksum. This fix prevents from uploading that
    file.
    
    Fixes #204
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>
    
        
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