def recover_disk(base_disk, base_mem, overlay_mem, overlay_disk, recover_path, chunk_size):
recover_fd = open(recover_path, "wb")
# get delta list from file and recover it to origin
delta_stream = open(overlay_disk, "r")
recovered_memory = Recovered_delta(base_disk, base_mem, chunk_size, \
parent=base_disk, overlay_memory=overlay_mem)
for delta_item in DeltaList.from_stream(delta_stream):
recovered_memory.recover_item(delta_item)
delta_list = recovered_memory.delta_list
# overlay map
chunk_list = []
# sort delta list using offset
delta_list.sort(key=itemgetter('offset'))
for delta_item in delta_list:
if len(delta_item.data) != chunk_size:
raise DiskError("recovered size is not same as page size")
chunk_list.append("%ld:1" % (delta_item.offset/chunk_size))
recover_fd.seek(delta_item.offset)
recover_fd.write(delta_item.data)
last_write_offset = delta_item.offset + len(delta_item.data)
# fill zero to the end of the modified file
if last_write_offset:
diff_offset = os.path.getsize(base_disk) - last_write_offset
if diff_offset > 0:
recover_fd.seek(diff_offset-1, os.SEEK_CUR)
recover_fd.write('0')
recover_fd.close()
# overlay chunk format: chunk_1:1,chunk_2:1,...
return ','.join(chunk_list)
raise MemoryError("footer data is different")
LOG.info("meta file information is matched with original")
elif command == "delta":
if (not settings.mig_file) or (not settings.base_file):
sys.stderr.write("Error, Cannot find modified memory file. See help\n")
sys.exit(1)
raw_path = settings.base_file
meta_path = settings.base_file + EXT_META
modi_mem_path = settings.mig_file
out_path = settings.mig_file + ".delta"
#delta_list = create_memory_overlay(modi_mem_path, raw_path, \
# modi_mem_path, out_path)
mem_deltalist= create_memory_deltalist(modi_mem_path,
basemem_meta=meta_path, basemem_path=raw_path)
DeltaList.statistics(mem_deltalist)
DeltaList.tofile(mem_deltalist, modi_mem_path + ".delta")
elif command == "recover":
if (not settings.base_file) or (not settings.delta_file):
sys.stderr.write("Error, Cannot find base/delta file. See help\n")
sys.exit(1)
base_mem = settings.base_file
overlay_mem = settings.delta_file
base_memmeta = settings.base_file + EXT_META
out_path = base_mem + ".recover"
memory_overlay_map = recover_memory(None, base_mem, overlay_mem, \
base_memmeta, out_path, verify_with_original="./tmp/modi")
