Comment 1 for bug 1619351

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Steve Langasek (vorlon) wrote : Re: Please use os.trunacte() instead of dd when creating the file

We should switch to native Python operations wherever feasible, but I can't see the problem you're describing. I've tested the sparseness at every stage and while ls shows a 4GB image, du consistently shows it occupying 300M on disk. What are you seeing that suggests this is not sparse?