3 bup_exec="$(dirname "$0")/bup-exec" || exit $?
4 exec "$bup_exec" "$0" ${1+"$@"}
7 from __future__ import absolute_import, print_function
8 from random import randint
9 from sys import stderr, stdout
12 from bup.compat import get_argvb
13 from bup.io import byte_stream
15 def smaller_region(max_offset):
16 start = randint(0, max_offset)
17 return (start, min(max_offset, randint(start + 1, start + 5)))
20 def possibly_larger_region(max_offset, min_sparse_len):
21 start = randint(0, max_offset)
22 return (start, min(max_offset, randint(start + 1,
23 start + 3 * min_sparse_len)))
26 def initial_region(max_offset, min_sparse_len):
28 return (start, min(max_offset, randint(start + 1,
29 start + 3 * min_sparse_len)))
32 def final_region(max_offset, min_sparse_len):
33 start = max(0, randint(max_offset - 3 * min_sparse_len,
35 return (start, max_offset)
38 def region_around_min_len(max_offset, min_sparse_len):
39 start = randint(0, max_offset)
40 return (start, min(max_offset, randint(start + min_sparse_len - 5,
41 start + min_sparse_len + 5)))
48 return generators[randint(0, len(generators) - 1)]()
54 out = byte_stream(stdout)
56 out = open(argv[1], 'wb')
58 print('Usage: sparse-test-data [FILE]', file=stderr)
61 bup_read_size = 2 ** 16
62 bup_min_sparse_len = 512
63 out_size = randint(0, bup_read_size * 10)
65 generators = (lambda : smaller_region(out_size),
66 lambda : possibly_larger_region(out_size, bup_min_sparse_len),
67 lambda : initial_region(out_size, bup_min_sparse_len),
68 lambda : final_region(out_size, bup_min_sparse_len),
69 lambda : region_around_min_len(out_size, bup_min_sparse_len))
72 sparse.append(random_region())
73 sparse.append(random_region())
76 if sparse[1][0] < sparse[0][0]:
77 sparse[0], sparse[1] = sparse[1], sparse[0]
80 sparse_offsets.append(sparse[0][0])
81 if sparse[1][0] <= sparse[0][1]:
82 sparse_offsets.append(max(sparse[0][1], sparse[1][1]))
84 sparse_offsets.extend((sparse[0][1], sparse[1][0], sparse[1][1]))
86 if sparse[1][1] != out_size:
87 sparse_offsets.append(out_size)
89 # Now sparse_offsets indicates where to start/stop zero runs
92 print('offsets:', sparse_offsets, file=stderr)
93 for offset in sparse_offsets:
95 print('write:', 'x' if data == 'x' else '0', count, file=stderr)
96 out.write(data * (offset - pos))
98 data = b'\0' if data == b'x' else b'x'