3 bup_python="$(dirname "$0")/bup-python" || exit $?
4 exec "$bup_python" "$0" ${1+"$@"}
7 from __future__ import absolute_import, print_function
8 from random import randint
9 from sys import stderr, stdout
12 sys.path[:0] = [os.path.dirname(os.path.realpath(__file__)) + '/../lib']
14 from bup.io import byte_stream
16 def smaller_region(max_offset):
17 start = randint(0, max_offset)
18 return (start, min(max_offset, randint(start + 1, start + 5)))
21 def possibly_larger_region(max_offset, min_sparse_len):
22 start = randint(0, max_offset)
23 return (start, min(max_offset, randint(start + 1,
24 start + 3 * min_sparse_len)))
27 def initial_region(max_offset, min_sparse_len):
29 return (start, min(max_offset, randint(start + 1,
30 start + 3 * min_sparse_len)))
33 def final_region(max_offset, min_sparse_len):
34 start = max(0, randint(max_offset - 3 * min_sparse_len,
36 return (start, max_offset)
39 def region_around_min_len(max_offset, min_sparse_len):
40 start = randint(0, max_offset)
41 return (start, min(max_offset, randint(start + min_sparse_len - 5,
42 start + min_sparse_len + 5)))
49 return generators[randint(0, len(generators) - 1)]()
51 if len(sys.argv) == 0:
53 out = byte_stream(stdout)
54 if len(sys.argv) == 2:
55 out = open(sys.argv[1], 'wb')
57 print('Usage: sparse-test-data [FILE]', file=stderr)
60 bup_read_size = 2 ** 16
61 bup_min_sparse_len = 512
62 out_size = randint(0, bup_read_size * 10)
64 generators = (lambda : smaller_region(out_size),
65 lambda : possibly_larger_region(out_size, bup_min_sparse_len),
66 lambda : initial_region(out_size, bup_min_sparse_len),
67 lambda : final_region(out_size, bup_min_sparse_len),
68 lambda : region_around_min_len(out_size, bup_min_sparse_len))
71 sparse.append(random_region())
72 sparse.append(random_region())
75 if sparse[1][0] < sparse[0][0]:
76 sparse[0], sparse[1] = sparse[1], sparse[0]
79 sparse_offsets.append(sparse[0][0])
80 if sparse[1][0] <= sparse[0][1]:
81 sparse_offsets.append(max(sparse[0][1], sparse[1][1]))
83 sparse_offsets.extend((sparse[0][1], sparse[1][0], sparse[1][1]))
85 if sparse[1][1] != out_size:
86 sparse_offsets.append(out_size)
88 # Now sparse_offsets indicates where to start/stop zero runs
91 print('offsets:', sparse_offsets, file=stderr)
92 for offset in sparse_offsets:
94 print('write:', 'x' if data == 'x' else '0', count, file=stderr)
95 out.write(data * (offset - pos))
97 data = b'\0' if data == b'x' else b'x'