Dump all holes in sparse file

sparse_dump.py

#!/usr/bin/python3
import os
import sys
if len(sys.argv) < 2:
        print ("Usage: sparse_dump filename")
        sys.exit(-1)

fd = os.open(sys.argv[1], os.O_RDONLY)
end = os.lseek(fd, 0, os.SEEK_END)
offset = 0
try:
        while True:
                offset = os.lseek(fd, offset, os.SEEK_HOLE)
                if offset >= end:
                        break
                print ("Hole start at %s" % offset)
                offset = os.lseek(fd,offset, os.SEEK_DATA)
                if offset > end:
                        break
                print ("Hole end at %s" % offset)
except:
        pass