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Mike Hibler authored
Resurrect: get the basic signature matching code working again. Enhance: add -U option to have imagezip update (or create) the signature file. Previously, the signature file was created off-line on boss with the imagehash command (that would be Mike's "imagehash" (/usr/testbed/bin/imagehash) and not Leigh's "imagehash" (/usr/testbed/sbin/imagehash)). Creating it as we create the image makes a lot of sense...except for how we do it. We actually read and create the hashes as a separate pass before we re-read, compress, and create the image--so we read the disk twice. [This is primarily because we are mooching off of the existing hash checking code (-H option). Doing this right will require re-writing The Big Loop which makes a single pass through the data, simultaneously dealing with disk IO, allocated ranges, and compression blocks all of which have different size/alignment criteria. But I digress...] Anyway, reading the disk data twic...
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