def _calculateCheckSums(self):
checkSumNames = ManifestInfo.CHECKSUM_NAMES
# checksums to do if we were not given any
checkSums = dict([(x, getattr(self.options, x, '')) for x in checkSumNames])
checkSumsToDo = [k for k, v in checkSums.items() if not v]
# remove the ones we told not to do
for c in checkSumsToDo[:]:
if getattr(self.options, 'no%s' % c.title(), False):
checkSumsToDo.remove(c)
if not checkSumsToDo and not self.options.sha1:
checkSumsToDo = ManifestInfo.MANDATORY_CHECKSUMS
bytes, chksums = Image.checksumImage(self.image, checkSumsToDo)
self.options.__dict__.update({'bytes': bytes})
self.options.__dict__.update(chksums)
